JPS5953197B2 - Disposable materials made from chlorinated polyethylene - Google Patents

Description

[Detailed description of the invention] The present invention is a consumable material using chlorinated polyethylene,
The purpose is to provide a consumable material that has appropriate color and aroma and is non-polluting during production and use.

Letter erasers have traditionally been widely used as school supplies and office supplies, and the types of letter erasers commonly used in the past are rubber and vinyl chloride letter erasers, but rubber letter erasers are produced through the vulcanization process. Since it takes a considerable amount of time to cure, that is, it is necessary to perform vulcanization at high heat for a long time, there is a disadvantage that the blended pigments and fragrances change or scatter, making it impossible to provide the desired color and fragrance. Therefore, there is a disadvantage that the commercial value is not necessarily satisfactory.

In addition, in the case of vinyl chloride, it is essential to use a phthalate-based plasticizer, and for this reason, it is necessary to give sufficient consideration to its toxicity in manufacturing and use. Although various studies have been carried out regarding the transferability of paints to paints, especially the transferability to vinyl chloride stationery, which is often used in stationery, it is still possible to obtain only those with a considerable transferability. It is well known that this has not been done.

The present invention was created through research to eliminate the disadvantages and drawbacks of conventional disposable materials as described above.
Made of chlorinated polyethylene and molded into the desired shape,
This chlorinated polyethylene is molded by heating at around 100 to 120°C, and since the molding time is short, it is possible to freely give it any color or fragrance, and it is free from phthalate plasticizers. Since it is possible to obtain a product that has the performance and characteristics as a solid waste material without the need for the above-mentioned In any case, products with high commercial value can be appropriately provided since no migration is observed.

To explain this invention in more detail, examples of formulations used in the invention are as follows.

That is, the compounding relationship of the product according to the present invention is as follows.

Elasuren (trade name of chlorinated polyethylene manufactured by Showa Yuka)
100 parts White fiber 150-800 parts Heavy calcium carbonate 0-600 parts Chlorinated paraffin 0-200 parts Light calcium carbonate 0-300 parts Titanium white
0 to 50 parts To explain the above formulation, if the white sub is less than 150 parts by weight based on 100 parts by weight of chlorinated polyethylene, the adsorption of pencil carbon will be insufficient and sufficient erasable performance will not be obtained. The carbon has a strong tendency to darken the paper surface, making it impossible to obtain the appropriate characteristics as a character-extinguishing material.

Also, if this white sub contains 800 parts by weight or more, the erasing rate is good, but the dough does not hold together well and crumbles as it is erased, so this is also a problem in obtaining a product that is desirable as a letter erasing material. I can't come.

On the other hand, all the formulations containing 150 parts by weight or more and 800 parts by weight or less of this white sub showed good test results,
In addition, there is no disintegration property, and a preferable extinguishable material can be obtained.

Heavy calcium carbonate is mixed appropriately, but
If more than 600 parts by weight is added, the hardness will increase, the strength will increase, and the eraser will not come out well, turning the paper black and making it difficult to erase, so the upper limit is set at 600 parts by weight.

Next, chlorinated paraffin is also mixed appropriately, but when 200 parts by weight or more of this chlorinated paraffin is added, it becomes too soft.
For this reason, the eraser becomes sticky and difficult to erase.

In addition, calcium carbonate is appropriately added, but if it exceeds 300 parts by weight, the filler will absorb too much oil and become too hard, resulting in poor erasing performance.

Even when titanium white is used to create a pure white appearance in a product, if it exceeds 50 parts by weight, the difference in whiteness becomes meaningless, and it is pointless to mix it in any more. Even if some degree of toughness as a material can be obtained, the overall erasing performance cannot necessarily be improved.

The specific manufacturing method is to first knead chlorinated polyethylene with rolls at a roll temperature of 60℃ to 90℃ in a roll mixer, and after plasticizing it, produce white sub, heavy calcium carbonate, light calcium carbonate, etc. Add and mix well.

Extrusion molding and press molding are used to mold the thus kneaded product, and the molding conditions for press molding are 110
Heat at ~130°C for about 10 minutes.

Further, the molding conditions for extrusion molding are heating at 110 to 130° C. for about 10 minutes.

In addition, in the case of extrusion molding, the temperature of the cylinder part is around 125℃,
The head part is 125-135℃, and the temperature of the base is 1
The temperature is about 40°C, and thereby a preferable waste material can be obtained.

Regarding the shape, it is the same as conventionally known consumable materials that it can be in any shape such as a plate or a block.

Some specific formulation examples of the invention and their erasure rates are shown below, and were manufactured under the conditions described above.

The erasure rate was tested according to the test method specified in JIS 56004 at a test speed of 36 cm/min and a test load of 5.
00gr, and the number of times of abrasion was 4 times (reciprocating).

The migration test was carried out by cutting a commercially available pencil with a surface coating layer into 40 mm pieces, stacking them together in parallel with a 35 x 15 x 5 mm test piece (product), applying a load of 40 g, and keeping at a constant temperature of 50 ± 2°C. After being placed in a container and subjected to constant temperature treatment for 360 minutes, it was taken out and the state of adhesion of paint components in the pencil coating layer to the test piece (letter eraser) was examined.

The printing material using chlorinated polyethylene according to the present invention as explained above solves the problems of migration, the toxicity of vinyl chloride monomers, and the toxicity of plasticizers, which were considered disadvantages of vinyl chloride printing material, and This is a new type of eraser that does not require time for the vulcanization process like rubber erasers, yet has sufficient eraser performance, and can be freely given shapes, colors, and scents. Moreover, since it is possible to obtain a stable and comfortable erasing effect without any change in quality over a long period of time, it is an invention that has great industrial effects.

Claims (1)

[Claims] 1. A consumable material made of chlorinated polyethylene and molded into the desired shape.