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Hollow glass microspheres-doped water-resistant modified polyvinyl acetate emulsion adhesive for pencils and preparation method thereof

A hollow glass microsphere, polyvinyl acetate technology, applied in the direction of monocarboxylic acid ester copolymer adhesive, adhesive additive, adhesive type, etc., can solve the problem of poor mechanical stability, temperature resistance to be improved, Brittle and easy to crack and other problems, to achieve the effect of uniform heating, not easy to slip off and fracture, and good adhesion

Inactive Publication Date: 2015-10-14
安徽雪峰木业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Adhesives are needed in the pencil making process, and its function is to bond the pencil lead to the pencil sheet. Most of the adhesives used in products on the market are polyvinyl acetate emulsion adhesives. This adhesive The raw materials are cheap, easy to use, non-toxic and harmless, and the bonding strength is relatively high. However, there are also some shortcomings. When vinyl acetate emulsion adhesives are applied to pencils, problems such as easy core slipping, broken cores, glue opening, and difficulty in cutting will directly affect the quality of products. Therefore, the development of high-efficiency and high-quality adhesives is crucial to improving the quality of pencils. important link

Method used

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Examples

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Effect test

Embodiment

[0012] The adhesive of this embodiment is made of the following raw materials in parts by weight: vinyl acetate 50, acrylic acid 11, methyl acrylate 7, hollow glass microspheres 1.5, polydimethylsiloxane 1.5, guar gum 14, OP -10 5. Sodium lauryl sulfate 1.5, potassium persulfate 0.4, 10% sodium hydroxide solution, acetic acid solution, ammonia water, deionized water 220.

[0013] The preparation method of this adhesive is:

[0014] (1) First put guar gum and sodium lauryl sulfate into 40 parts by weight of deionized water, heat to 75°C, stir at high speed to dissolve completely, then add 10% sodium hydroxide solution, and adjust the pH value of the solution to 10.0 , continue to stir and mix evenly, add polydimethylsiloxane, continue to stir and mix for 60 minutes, then cool to 50°C, add dropwise acetic acid to adjust the pH of the solution to 8.0, and obtain a modified guar gum solution for later use;

[0015] (2) Mix the modified guar gum solution prepared in step (1), 2 / 3 ...

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Abstract

The invention relates to the field of a polyvinyl acetate emulsion adhesive, specifically to a hollow glass microspheres-doped water-resistant modified polyvinyl acetate emulsion adhesive for pencils and a preparation method thereof. According to the preparation method of the adhesive, polymeric monomers such as vinyl acetate, acrylic acid and methyl acrylate, etc. react in nitrogen atmosphere and under the water-bath condition such that polymerization efficiency is higher; a modified guar gum solution is added in the reaction process to replace commonly-used polyvinyl alcohol so as to improve water resistance of the polymers; and hollow glass microspheres are added to improve mechanical property of the adhesive and effectively enhance crack resistance, fire resistance and heat resistance of the adhesive. The modified polyvinyl acetate adhesive has good bonding strength, has good bond force on timber and graphite cores, has good fluidity, is light in weight and long-acting, and is not easy to cause slipping and fracture of pencil lead.

Description

technical field [0001] The invention relates to the field of polyvinyl acetate emulsion adhesives, in particular to a water-resistant modified polyvinyl acetate emulsion adhesive doped with hollow glass microspheres for pencils and a preparation method thereof. Background technique [0002] Adhesives are needed in the pencil making process, and its function is to bond the pencil lead to the pencil sheet. Most of the adhesives used in products on the market are polyvinyl acetate emulsion adhesives. This adhesive The raw materials are cheap, easy to use, non-toxic and harmless, and the bonding strength is relatively high. However, there are also some shortcomings. When vinyl acetate emulsion adhesives are applied to pencils, problems such as easy core slipping, broken cores, glue opening, and difficulty in cutting will directly affect the quality of products. Therefore, the development of high-efficiency and high-quality adhesives is crucial to improving the quality of pencils...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J131/04C09J11/08C09J11/04
Inventor 娄森良商亚超
Owner 安徽雪峰木业有限公司