Tag Archives: cellulose acetate

Handles: cellulose acetate/bioplastic

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Acca Kappa: Cellular Acetate handle51b0fe0dfb04d661d30008f5._w.540_s.fit_

Italian brand Acca Kappa have been creating luxury bath and beauty products for over 50 years (most commonly seen in Four Seasons Hotel suites worldwide). But in celebration of their 140 year history, they’ve created a limited edition toothbrush that is hand cut, milled and handle shaped from biodegradable cellulose acetate with natural bristles. The cellulose is non-toxic and transparent, and biodegrades at the same rate as that of an oak leaf.We first saw this toothbrush at Anthropologie ($5.50), along with other biodegradable personal hygiene items like this body brush ($54), hair brush ($36), and comb ($15). After doing a little searching, we also found the toothbrush available through Amazon for $5.99.

Lovely!

and more from Shop Saison Aust

Made using traditional production methods, Acca Kappa’s Bio Hair Brush is made of biodegradable cellulose acetate, a non-toxic material derived from cotton. The degradation time is comparative to that of an oak leaf.

and more from Biome Aust

Acca Kappa are reknowned internationally for highakboarblk quality hair brushes and combs and are dedicated to using only the finest of sustainable raw materials.

Acca Kappa’s bio resin comb is transparent, glossy, very resilient and will glide through hair with ease.  Designed with both fine and medium  teeth for versatile styling.

Made of biodegradable cellulose acetate, a non-toxic material derived from cotton & wood by-products.The time taken for each comb to biodegrade is comparative to that of an oak leaf.

Measures 21cm L x 5cm W.

Acca Kappa boast over 140 years of experience, research and traditional craftsmanship in designing brushes that are both functional, beautiful and will stand the test of time. Turn daily grooming into pampering, enjoy a little self-indulgence and give your bath area a touch of elegance with Acca Kappa quality brushes and combs.

Acca Kappa is an Italian company certified to ISO quality standards.

(International Organization for Standardization),


Cellulose Acetate/Bioplastic

According to Wikipedia, cotton produces the purest form known, of cellulose.

MAKING HEMP PLASTIC

source:  http://green-plastics.net/posts/472/viable-recipe-strong-hemp-plastic/

Hemp plastic is probably not possible for you to make at home as a DIY project. However, I can explain to you what hemp plastic is and why it is hard to make! I can also tell you about how you CAN potentially include hemp in a home made bioplastic project if you really want to.

Let’s begin simple.

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from cellular acetate or bioplastic

For something to be a plastic, it must contain at least two types of molecule: a polymer molecule and a plasticizer molecule.

Polymers are long chain molecules. They are important because the long chains of the molecule make the plastic strong. So, for example, in many of the recipes on this website the polymer is either starch or gelatin or in some cases agar (from seaweed).

Plasticizers are smaller molecules that get IN BETWEEN the polymers to make them able to slide around each other. This is what makes plastics flexible. In many of the recipes on this website, glycerine is used as a plasticizer.

Hemp contains cellulose, which is a polymer!!!! Specifically, cellulose is a long-chain polysaccharide with the chemical formula (C₆H₁₀O₅)n that consists of hundreds or thousands of linked glucose units.

Professional companies are able to extract the cellulose from the hemp, in order to combine it with a plasticizer and make cellulose-based plastics. Some common cellulose-based plastics include cellophane, rayon, and celluloid.

HOWEVER…. and this is the sad part… extracting the cellulose from hemp is complex and requires chemical professionals. So you won’t be able to do that on your own.

However, if you want to still include hemp in your home bioplastic project, there IS SOMETHING YOU CAN DO.

It is common for plastics — both bioplastics and regular plastics — to be combined with a “reinforcing matrix.” In other words, when the plastic is in the liquid phase other stuff can be mixed in so that when the plastic solidifies, it makes the plastic STRONGER.

You could potentially make bioplastic out of some other kind of polymer — such as starch or gelatin — that is easier for a home project, but mix in hemp fibers while you are making the bioplastic. You can experiment to see if the hemp fibers increase its strength!

That would be my best recommendation if you want to include hemp in your home DIY bioplastic project.

FURTHER READING

https://sites.google.com/site/scidiy/diy-plastic/hemp-plastic

http://www.hempplastic.com/

http://www.greenpassion.org/topic/27504-cannabis-acetate/

http://bioplastics.org.au/

http://www.bioplasticsmagazine.com/en/index.php

http://onlinelibrary.wiley.com/doi/10.1002/mame.200800266/abstract

http://pubs.acs.org/doi/abs/10.1021/ie030873c

Cellulose Acetate

An every day bio-based material with a century of history

Cellulose Acetate has been at the cutting edge of innovation for over 100 years. It’s been part of aviation, cinema, synthetic fibres, plastics and many more fields.
The basic material for cellulose acetate, plant cellulose, is the most readily available renewable material on the planet. Solvay Acetow ensures that its production processes, from plant to finished product, are as environmentally friendly and as sustainable as possible. The wood pulp raw material is sourced exclusively from renewable and carefully managed forestry plantations, where there is systematic replanting after harvesting.
The manufacturing process itself is designed to minimise the use of chemicals and water at every stage, recovering and reusing them wherever possible and keeping quantities of chemicals to the lowest possible levels. And, at the end of its life the finished product, cellulose acetate is biodegradable.

Plastics

from ukcia.org:        Traditional plastic manufacture involves the use and creation of many toxins. Some plastics themselves are even declared to be toxic to humans. These include PCBs which disrupt hormones, PCTs – endocrime disrupters (which have now been outlawed, but not removed from the environment), non biodegradable phylates found in childrens’ toys and PVC construction materials, and the hormonal disrupting Bisphenol a. Uugh!

The primary constituent (77%) of plastics is cellulose ….  What’s the highest cellulose content plant known to man? …. hemp! Cellulose can be extracted to produce non-toxic plastics!

Cellulose acetate is one of the most important esters of cellulose. Depending on the way it has been processed cellulose acetate can be used for great varies of applications (e.g. for films, membranes or fibers). The properties of the applied cellulose acetates are very important for these applications. A special field for using cellulose acetate is the synthesis of porous, spherical particles, so called cellulose beads. Different types of technical cellulose acetates were used and their ability to form such cellulose beads was characterized. First the different types of cellulose acetates were characterized by means of solubility; turbidity and degree of substitution. In addition the molar mass and the distribution of substituents along the polymeric chain were analyzed. Next, the cellulose beads were synthesized within an emulsion process using these different cellulose acetates. Then the properties (particle size, porosity, morphology) of the cellulose beads were determined. Finally, the relationship between the characteristic of cellulose acetates and properties of cellulose beads was investigated.

from encyclopedia brittanica:

cellulose acetate, synthetic compound derived from the acetylation of the plant substance cellulose. Cellulose acetate is spun into textile fibres known variously as acetate rayon, acetate, or triacetate. It can also be molded into solid plastic parts such as tool handles or cast into film for photography or food wrapping, though its use in these applications has diminished.

Cellulose is a naturally occurring polymer obtained from wood fibres or the short fibres (linters) adhering to cotton seeds. It is made up of repeating glucose units that have the chemical formula C6H7O2 (OH)3 and the following molecular structure:

In unaltered cellulose, the X in the molecular structure represents hydrogen (H), indicating the presence in the molecule of three hydroxyl (OH) groups. The OH groups form strong hydrogen bonds between cellulose molecules, with the result that cellulose structures cannot be loosened by heat or solvents without causing chemical decomposition. However, upon acetylation, the hydrogen in the hydroxyl groups is replaced by acetyl groups (CH3-CO). The resultant cellulose acetate compound can be dissolved in certain solvents or softened or melted under heat, allowing the material to be spun into fibres, molded into solid objects, or cast as a film.

Cellulose acetate is most commonly prepared by treating cellulose with acetic acid and then with acetic anhydride in the presence of a catalyst such as sulfuric acid. When the resultant reactions are allowed to proceed to completion, the product is a fully acetylated compound known as primary cellulose acetate, or, more properly, cellulose triacetate. Triacetate is a high-melting (300 °C [570 °F]), highly crystalline substance that is soluble only in a limited range of solvents (usually methylene chloride). From solution, triacetate can be dry-spun into fibres or, with the aid of plasticizers, cast as a film. If the primary acetate is treated with water, a hydrolization reaction can occur in which the acetylation reaction is partially reversed, producing a secondary cellulose acetate, or cellulose diacetate. Diacetate can be dissolved by cheaper solvents such as acetone for dry-spinning into fibres. With a lower melting temperature (230 °C [445 °F]) than triacetate, diacetate in flake form can be mixed with appropriate plasticizers into powders for molding solid objects, and it can also be cast as a film.

Cellulose acetate was developed in the late 19th century as part of an effort to design industrially produced fibres based on cellulose. Treatment of cellulose with nitric acid had produced cellulose nitrate (also known as nitrocellulose), but the difficulties of working with this highly flammable compound encouraged research in other areas. In 1865 Paul Schützenberger and Laurent Naudin of the Collège de France in Paris discovered the acetylation of cellulose by acetic anhydride, and in 1894 Charles F. Cross and Edward J. Bevan, working in England, patented a process for preparing chloroform-soluble cellulose triacetate. An important commercial contribution was made by British chemist George Miles in 1903–05 with the discovery that, when the fully acetylated cellulose was subjected to hydrolysis, it transformed into a less highly acetylated compound (cellulose diacetate) that was soluble in cheap organic solvents such as acetone.

from A to Z of Materials

Background
Cellulose acetate was first prepared by Paul Schützenberger in 1865. It took another 29 years before Charles Cross and Edward Bevan patented a process for its manufacture.
At about the same time, Little in the US and Bronnert in Germany simultaneously produced cellulose acetate filaments, which were in actual fact cellulose triacetate, which differs in that it is does not easily dissolve on common solvents.
In 1904 George Miles found that partially hydrolyse cellulose acetate would dissolve in acetone. Brothers Henri and Camille Dreyfus exploited this fact to make cellulose acetate films and lacquers in 1910. During World War 1, the technology was used for waterproofing and stiffening the fabrics covering aeroplane wings.
In 1919, they introduced the first cellulose based yarn to the market, called Celanese.
Source
Commercially, cellulose acetate is made from processed wood pulp. The pulp is processed using acetic anhydride to form acetate flake from which products are made.
Coming from wood pulp, means that unlike most man-made fibres, it comes from a renewable resource and is biodegradable.
Another technique for producing cellulose acetate involved treating cotton with acetic acid, using sulfuric acid as a catalyst.

Key Properties
Typical properties of cellulose acetate polymers include:

•         Good toughness

•         Deep gloss

•         High transparency

•         A feel that can be described as ‘natural’

Applications
Textiles and Fibres

Cellulose acetate fibres are used for textiles and clothing by many of the top designers in the world. Factors making this material suitable for this application include the fact that it is comfortable, breathable and absorbent. They can also be dyed in many different colours and combined with a range of other fibres such as rayon, cotton, wool, silk etc.
Spectacle Frames
Early frames for spectacles were cut from sheets of cellulose acetate. While use of cellulose acetate has largely been superseded by injection moulding with more modern thermoplastics, some up-market spectacles are still made in this way. This is most often the case when colour blends/effect cannot be produced by injection moulding. A popular example is the imitation tortoise shell effect.
Tools
Handles for tools have often been made with cellulose acetate. This materials has been used for this application due to its natural feel and toughness.
Film Media
Cellulose triacetate has been the material of favour for photographic film since about 1940. A product called “safety film” exists that has been popular due to its resistance to combustion.
Other Applications
Other applications of cellulose acetate include:

•         Wound dressings

•         Personal hygiene products

•         Absorbent cloths and wipes

•         Specialty papers

•         Filter media, including cigarette filters. Such materials are often referred to as “tow”.

from History of Plastics:

Briefly

Cellulose acetate was first prepared in 1865 by Schützenberger, and a manufacturing process developed by Cross and Bevan in 1894. An acetone-soluble polymer was developed by Miles in 1904, employed for ‘safety film’ in 1909, and extensively used for aircraft dope during the First World War. The dope factories were later converted for the spinning of fibres – Celanese.

Cellulose acetate was produced commercially as sheet and rod material in about 1927 and as moulding powder in about 1930. It is a tough thermoplastic available in a full colour range, including transparent. It has a good gloss and was widely used for toys until ABS plastics were developed. Attractive and with a ‘natural feel’ it is still used for tool handles and spectacle frames.

In more detail

Although cellulose acetate was first prepared in 1865 by the French chemist Paul Schützenberger, it was not until 1894 that the first industrial process for its manufacture was patented in the UK by Charles Cross and Edward Bevan. At about the same time, Little in the US made cellulose acetate filaments experimentally, as did Bronnert in Germany. However, this material was essentially cellulose triacetate, a rather intractable polymer, not readily soluble in commonly available solvents. In 1904 George Miles, an American chemist, discovered that if the polymer was partially hydrolysed, it became soluble in acetone.

The Swiss brothers Henri and Camille Dreyfus used this procedure for lacquer and film production at Basle in 1910, and at the outbreak of World War I set up a factory in Spondon, Derbyshire, England to make acetate ‘dope’ for waterproofing and stiffening fabric covered aeroplane wings. They set up a similar plant at Cumberland, Md., for the US army in 1917.

After the war they concentrated their efforts in England, and in 1919 introduced the first acetate yarn Celanese. In 1924, they switched entirely to the US where acetone and acetic anhydride were cheaply available. In the same year, rayon became adopted as a generic term for all ‘artificial silk’.

Cellulose acetate (CA) in combination with plasticizers, such as diethyl and dimethyl phthalate, produces a plastics material which can be heat softened and forced under pressure into a cool mould. This injection moulding process was developed by Dr Arthur Eichengrün of Celonwerke to exploit the moulding properties of the plasticized CA moulding materials he had produced. His first injection moulding machine had a maximum shot weight of about 8 gm provided by a hand-operated plunger mechanism, a far cry from today’s machines, some of which have a maximum moulding size in excess of 100 kg.

CA plastics are tough with deep gloss and high transparency. They possess a ‘feel’ which is different to other plastics and which is often described as more ‘natural’. This may explain why CA has retained its popularity for making items which are handled frequently such as spectacle frames and tool handles, many transparent tool handles are still made from cellulose acetate and its sister material cellulose butyrate. Other items made from CA included combs, fashion accessories, pen barrels and toys, but these are now more likely to be moulded from more modern thermoplastics.

Early spectacle frames were cut from sheet material, mostly in imitation tortoiseshell which was often referred to as ‘optical shell’. Reinforcing nickel wires for the side arms were forced into heat-softened strips of CA sheet. Nowadays, frames are generally moulded into shape – a more economic process. However, certain high-class frames are still made using the old process, especially to achieve special colour effects not possible using injection moulding.

Despite being much less flammable than cellulose nitrate, acetate film did not become established for photographic use until after World War II because of the technical excellence of celluloid and the vested interests of film manufacturers. There was, however, a demand for transparent sheet material in laminated safety glass, especially car windscreens before toughened glass became available for this purpose.

Ironically, cellulose triacetate which was unsuccessful initially, returned to favour when a suitable, relatively non-toxic solvent (dichloromethane ) became available in the 1940s. Since then photographic film has been almost entirely based on cellulose triacetate and Tricel cellulose triacetate fibres were introduced in 1954.

Few plastics can boast such a long pedigree as cellulose acetate and, being made entirely from renewable resources, CA may yet have a long way to run.

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eco Packaging: surely this is simple?

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square_cello_bagsCellophane, Cellulose Acetate, Cardboard, Corn starch wrapper  (perhaps not. the corn growing fields necessary for its manufacture are apparently not environmentally kosher)

 

 

Dissolving toothpaste packet


WHAT IS CELLULOSE ACETATE ?
source:  http://www.interplexindia.com/aca.htm

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Cellulose Acetate is a natural plastic, which is manufactured from purified natural cellulose. Natural cellulose of the appropriate properties is derived primarily from two sources, cotton linters and wood pulp. In the manufacturing process of Cellulose Acetate, natural cellulose is reacted with acetic anhydride to produce Cellulose Acetate, which comes out in a flake form. This flake is then ground to a fine powder.

Cellulose Acetate in primary form cannot be processed as a thermoplastic. It can only be processed by dissolving in a solvent and spinning or casting.  However, it can be processed by normal plastics processing techniques in compounded form.  For this, Cellulose Acetate has to be blended with a suitable combination of     and additives and melt compounded to get Cellulose Acetate Granules. Cellulose Acetate Granules can then be processed by all standard techniques.

GENERAL PROPERTIES OF CELLULOSE ACETATE

Cellulose Acetate Granules are a high performance thermoplastic with a unique combination of properties that make it the  material
of  choice for many applications.

  • These properties include
  • High transparency and aesthetic appeal
  • High impact and mechanical strength
  • High dielectric constant
  • Excellent machineability
  • Good resistance to a variety of chemicals
  • Compatibility with human skin

Ability to be offered in an unlimited range of colours

Chemical resistance

Cellulose Acetate has good chemical resistance to:
diluted aqueous solutions with acidic base and inorganic salts
parafinic hydrocarbons
superior alcohols
solutions with fatty matter

Cellulose Acetate is chemically effected by:  alcohols, aromatic hydrocarbons or solvents with chlorine, nitro benzene, or similar aromatic solvents.

It will expand and lose plastification in contact with them.
Soluble in acetone, esters, acids, strong mineral bases
Chemically degrades with oxidizing salts

RESISTENCE TO MOISTURE

Cellulose acetate is hygroscopic (see table)

When a part is in contact with boiling water, there can be a superficial whitening on the surface which disappears.

Absorption of water by part with 4mm thickness when exposed to conditions of constant RH for 24 hrs
at temperature of 23 C
RH(%)     Water Absorption(PPM)
0%     0%
50%     2%
95%     5%

QUALITY CONSIDERATION

Cellulose Acetate is  natural polymer with natural variations in the base raw material.  To get a consistent product of the highest quality requires a combination of technology and experience.  Interplex has a very sound technology base. Interplex has been processing Cellulose Acetate for over twelve years and has developed substantial expertise in this area. This processing expertise is  backed with a strong focus on quality and a well-equipped laboratory for testing the input raw materials and final product.

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