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Biodegradable raw material of toothbrush handle and preparation method thereof

A biodegradable toothbrush handle technology, applied in the field of toothbrush handle raw materials and its preparation, can solve the problems of long molding cycle, difficult molding, toxicity, etc., and achieve the effect of easy molding molding cycle, shortening molding cycle, and reducing costs

Inactive Publication Date: 2012-03-28
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, PLA is brittle, easy to break, low in crystallinity and difficult to form, so it is not ideal to use as a raw material for toothbrush handles
[0004]In order to improve the toughness of polylactic acid, people have carried out some research work, such as compounding polylactic acid and other aliphatic polyesters, but the price is expensive and it is difficult to be accepted by the market. accept
Ethylene-vinyl acetate copolymer (EVA) is also used to toughen polylactic acid because of its cheapness, easy availability and excellent toughness, but the compatibility of PLA and EVA is not ideal, making the effect difficult to achieve practical application. Therefore, Sun Qiangying et al. (Journal of Donghua University (Natural Science Edition), 2009, 135 (4), 376.) used ethylene-methyl acrylate glycidyl methacrylate (E-MA-GMA) and horse Anhydride-grafted ethylene-vinyl acetate (EVA-MAH) has prepared toughened polylactic acid as a compatibilizer of PLA and EVA, but the price is higher; Fu Xuejun et al. (Plastic Science and Technology, 2007, 35 (7) , 50) The plasticizer dioctyl phthalate (DOP) is used as the compatibilizer of PLA and EVA, but DOP is toxic and not suitable for the preparation of toothbrush handles; long cycle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The raw material components are calculated by weight: 78 parts of polylactic acid, 20 parts of ethylene-vinyl acetate copolymer, 1 part of inorganic nucleating agent, 0.5 part of compound surface treatment agent and 0.5 part of stabilizer.

[0028] In this embodiment, the inorganic nucleating agent is calcium carbonate and silicon dioxide, and its weight ratio is 1:1, and the compound surface treatment agent is 0.2 parts of 3-glycidyl etheroxypropyl trimethoxysilane and 0.3 parts of A mixture of 4-trifluoromethylbenzyl isocyanate stabilized with 0.25 parts of 2,4-dihydroxybenzophenone and 0.25 parts of tetrakis[β-(3,5-di-tert-butyl-4-hydroxy A mixture of phenyl)propionate]pentaerythritol esters.

[0029] The preparation method of the biodegradable toothbrush handle raw material of the present embodiment comprises the steps:

[0030] The first step is to uniformly mix the inorganic nucleating agent and the compound surface treatment agent, and then activate it. Specifi...

Embodiment 2

[0037] The raw material components are calculated by weight: 80 parts of polylactic acid, 10 parts of ethylene-vinyl acetate copolymer, 5 parts of inorganic nucleating agent, 3 parts of compound surface treatment agent and 2 parts of stabilizer.

[0038] In this example, the inorganic nucleating agent is calcium carbonate, the compound surface treatment agent is a mixture of 2 parts of vinyltriacetoxysilane and 1 part of toluene diisocyanate, and the stabilizer is 1.5 parts of 4,4-methylene (2,6-di-tert-butylphenol) and 1 part of N,N'-bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hydrazine.

[0039] The preparation method of the biodegradable toothbrush handle raw material of the present embodiment comprises the steps:

[0040] The first step is to uniformly mix the inorganic nucleating agent and the compound surface treatment agent, and then activate it. Specifically, the calcium carbonate is first surface-treated with vinyltriacetoxysilane and toluene diisocyanate, and t...

Embodiment 3

[0047] The raw material components are by weight: 85 parts of polylactic acid, 2 parts of ethylene-vinyl acetate copolymer, 12 parts of inorganic nucleating agent, 0.6 part of compound surface treatment agent and 0.4 part of stabilizer.

[0048] In the present embodiment, the inorganic nucleating agent is Gaojiu, the composite surface treatment agent is a mixture of 0.5 parts of vinyltriethoxysilane and 0.1 part of bisoxazoline, and the stabilizer is 0.1 part of thiodipropionic acid di A mixture of lauryl ester and 0.3 parts of pentaerythritol bisphosphite bis(2,4-di-tert-butylphenyl) ester.

[0049] The preparation method of the biodegradable toothbrush handle raw material of the present embodiment comprises the steps:

[0050] The first step is to uniformly mix the inorganic nucleating agent and the compound surface treatment agent, and then activate it. Specifically, first surface-treat kaolin with vinyltriethoxysilane and bisoxazoline, mix kaolin and compound surface trea...

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Abstract

The invention provides a biodegradable raw material of a toothbrush handle and a preparation method thereof. The preparation method comprises the following steps: in a twin-screw extruder, adding a mixture of PLA (polylactic acid), EVA (ethylene vinyl acetate), a nucleating agent modified by a compounded surface finishing agent and a stabilizer which are evenly mixed in advance; and then extruding and pelleting at a certain temperature and rotation speed, so as to prepare the biodegradable raw material, which has biodegradability and good toughness and is easy to form, of the toothbrush handle. In the invention, the compounded surface finishing agent with reaction function is adopted, the interface status among PLA, EVA and the inorganic nucleating agent is improved by utilizing in situ reaction so that the toughness of the prepared raw material is greatly improved, and the prepared raw material is easy to shape and can be used for the raw material of the toothbrush handle, thereby retarding the use of petrifaction raw materials and eliminating white pollution. Thus, the raw material of the biodegradable toothbrush handle has wide industrial prospect.

Description

technical field [0001] The invention relates to the technical field of polymer processing, in particular to a biodegradable toothbrush handle raw material and a preparation method thereof. Background technique [0002] A toothbrush is a simple commodity with a handle that resembles a popsicle stick. At present, toothbrush handles are mostly made of traditional petrochemical raw materials such as polypropylene, polystyrene and rubber, which are all non-biodegradable. Although a toothbrush handle is very small, only about ten grams, everyone needs to use a toothbrush. According to scientific use, a toothbrush should be changed at least every three months. There are about 6.9 billion people in the world, and the number of toothbrush handles used each year is about It is 200 billion pieces (about 200,000 tons of plastic), and when it is discarded, it will generate 200,000 tons of plastic waste, so the toothbrush handle not only uses a lot of petrochemical resources, but also br...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L23/08C08K13/06C08K9/06C08K3/26C08K3/36C08K3/34
Inventor 戚嵘嵘钱天悦李冠叶丹丹朱健陈芳殊
Owner SHANGHAI JIAO TONG UNIV
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