Thermosetting artificial board starch adhesive and preparation method thereof

A starch adhesive and wood-based panel technology, applied in the direction of adhesives, grafted polymer adhesives, adhesive types, etc., can solve the problems of long reaction time and high requirements for reaction control, so as to save time in the process, shorten the reaction time, cost reduction effect

Active Publication Date: 2020-05-29
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In response to the above performance requirements for adhesives, the research team has previously prepared thermosetting starch adhesives, which have achieved ideal results in terms of storage stability and dry strength, but the process involves simultaneous dropwise addition of graft copolymerization Monomers and cross-linked monomers have high requirements for reaction control and a long reaction time, and there is still room for further improvement in the amount of monomers and the proportion of starch

Method used

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  • Thermosetting artificial board starch adhesive and preparation method thereof
  • Thermosetting artificial board starch adhesive and preparation method thereof
  • Thermosetting artificial board starch adhesive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Formula (mass / g):

[0041]

[0042]

[0043] Process flow:

[0044] (1) Starch and water are made into starch milk with a mass ratio of 20% concentration based on starch dry basis, and stirred evenly;

[0045] (2) Adjust the temperature of the starch milk to 50°C, add 0.5mol / L hydrochloric acid, acidify for 1.5h, and then adjust the pH to 4;

[0046] (3) Adjust the temperature of the starch milk after acid hydrolysis to 80°C, and pregelatinize for 20 minutes;

[0047] (4) Take the initiator, grafting monomer and emulsifier accounting for 10% of the total addition amount to make a seed emulsion, add it to the reaction system after pre-gelatinization in step (3); cool down to 70 ° C, and the initial grafting is completed in 5 minutes After that, immediately add the remaining initiator for further grafting. After 20 minutes, add the cross-linking monomer solution with a mass concentration of 5% dropwise at a constant speed within 3 hours, and add 20 g of an initiat...

Embodiment 2

[0051] Formula (mass / g):

[0052]

[0053] Process flow:

[0054] (1) Starch and water are made into starch milk with a mass ratio of 20% concentration on a starch dry basis, and stirred evenly;

[0055] (2) Adjust the temperature to 50°C, add 0.5mol / L hydrochloric acid, acidify for 1.5h, and then adjust the pH to 4;

[0056] (3) Adjust the temperature of the acid-hydrolyzed starch milk to 90° C., and pregelatinize it for 20 minutes;

[0057] (4) Take the initiator, grafting monomer and emulsifier accounting for 10% of the total addition amount to make a seed emulsion, add it to the reaction system after pre-gelatinization in step (3); cool down to 70 ° C, and the initial grafting is completed in 5 minutes Afterwards, the remaining initiator was added immediately for further grafting, and after 20 minutes, a cross-linking monomer solution with a mass concentration of 5% was added dropwise at a constant speed within 3 hours. As a result, it was found during the experiment ...

Embodiment 3

[0061] Formula (mass / g):

[0062]

[0063] Process flow:

[0064] (1) Starch and water are made into starch milk with a mass ratio of 20% concentration based on starch dry basis, and stirred evenly;

[0065] (2) Adjust the temperature of the starch milk to 50°C, add 0.5mol / L hydrochloric acid, acidify for 1.5h, and then adjust the pH to 4;

[0066] (3) Adjust the temperature of the starch milk after acid hydrolysis to 80°C, and pregelatinize for 20 minutes;

[0067] (4) Take the initiator, grafting monomer and emulsifier accounting for 10% of the total addition amount to make a seed emulsion, add it to the reaction system after pre-gelatinization in step (3); cool down to 70 ° C, and the initial grafting is completed in 5 minutes After that, immediately add the remaining initiator for further grafting. After 20 minutes, add the cross-linking monomer solution with a mass concentration of 5% dropwise at a constant speed within 3 hours, and add 20 g of an initiator with a ma...

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Abstract

The invention discloses a thermosetting artificial board starch adhesive and a preparation method thereof, and belongs to the technical field of adhesive preparation. Starch is used as a main raw material, and after acidolysis, a semi-continuous seeded emulsion polymerization method is adopted for preparation. By accurately controlling the pre-gelatinization temperature, the initiator adding time,the crosslinking monomer adding amount, the crosslinking monomer dripping speed and the crosslinking monomer dispersion liquid concentration, the reaction degree of crosslinking monomers is reasonably controlled, and the step of dripping comonomers is omitted. Meanwhile, the reaction time is greatly shortened, the use amount of petroleum monomers is reduced, complex reaction steps are simplified,the proportion of starch accounting for the total solid content is increased to 75% or above from 40%, and the cost of the starch adhesive is reduced. The adhesive disclosed by the invention is goodin water resistance and strong in cohesion, various properties of the manufactured artificial board exceed the standard of class II artificial boards, and the adhesive is suitable for mass productionand is widely applied to adhesion of hot-pressed wood decorations, artificial boards and plywood.

Description

technical field [0001] The invention relates to a thermosetting artificial board starch adhesive and a preparation method thereof, belonging to the technical field of adhesive preparation. Background technique [0002] With the development of construction and decoration, the demand for wood products in my country's consumer market has greatly increased. However, my country's per capita forest area is small, so the wood-based panels prepared from other non-timber plants have become an excellent way to solve the shortage of timber. Most of the wood-based panels on the market are produced by hot-pressing process, using the "trialdehyde" series of adhesives with thermosetting properties, which has high production efficiency, but the raw materials of the adhesives are not renewable, and the release of harmful gases such as formaldehyde has adverse effects on the environment. [0003] Starch is an extremely abundant biomacromolecule in nature. It has a wide range of sources, is c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J151/02C08F251/00C08F218/08C08F220/58C08F2/26
CPCC08F2/26C08F251/00C09J151/02C08F218/08
Inventor 程力顾正彪李显尧李兆丰洪雁李才明班宵逢
Owner JIANGNAN UNIV
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