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Preparation method of high-bonding-strength waterproof starch-based wood adhesive

A starch-based, high-bond technology, used in non-polymer adhesive additives, adhesives, adhesive types, etc., can solve the problems of poor bonding strength and low solid content, and achieve good water resistance and molecular weight reduction. Small, high bond strength effect

Pending Publication Date: 2020-10-09
马科
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main technical problem to be solved by the present invention is to provide a method for preparing a waterproof starch-based wood glue with high bonding strength, aiming at the problems of low solid content, poor water resistance and poor bonding strength of starch adhesives produced by traditional methods at present.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of pretreated starch:

[0031] Mix cornstarch and water at a mass ratio of 1:8 and put them into the reactor, start the agitator and stir and mix at a speed of 200r / min for 20min to obtain a starch emulsion, and then use a 5% sodium hydroxide solution to adjust the starch The pH of the emulsion is 10, and tartaric acid with 5% starch mass is added at the same time, the temperature is raised to 40°C, and the reaction is stirred for 1 hour;

[0032]After the above stirring reaction is completed, continue to add hydrogen peroxide of 5% starch emulsion mass to the reaction kettle, heat up to 70°C, keep warm and stir for 30min, filter and separate to obtain the filter residue after the reaction, put it into an oven, and put it in an oven at 90°C Dried for 1 hour to obtain the dried product, which is the pretreated starch, for subsequent use;

[0033] Preparation of modified starch:

[0034] Mix polyvinyl alcohol and deionized water at a mass ratio of 1:6, put t...

Embodiment 2

[0041] Preparation of pretreated starch:

[0042] Mix cornstarch and water at a mass ratio of 1:8 and put them into the reactor, start the agitator and stir and mix at a speed of 250r / min for 25min to obtain a starch emulsion, and then adjust the starch emulsion with a 5% sodium hydroxide solution The pH of the emulsion is 10, and at the same time, tartaric acid with 5% starch mass is added, heated to 45°C, and stirred for 1.5 hours;

[0043] After the above stirring reaction is completed, continue to add hydrogen peroxide with 5% starch emulsion mass to the reaction kettle, heat up to 72°C, keep warm and stir for 35min, filter and separate to obtain the filter residue after the reaction, put it into an oven, and heat it at 95°C Dried for 1.5h to obtain the dried product, which is the pretreated starch, for subsequent use;

[0044] Preparation of modified starch:

[0045] Mix polyvinyl alcohol and deionized water at a mass ratio of 1:6, put them into a mixer, heat up to 85°C...

Embodiment 3

[0052] Preparation of pretreated starch:

[0053] Mix cornstarch and water at a mass ratio of 1:8 and put them into the reactor, start the agitator and stir and mix at a speed of 300r / min for 30min to obtain a starch emulsion, and then adjust the starch emulsion with a 5% sodium hydroxide solution The pH of the emulsion was adjusted to 11, and tartaric acid with 5% starch mass was added at the same time, the temperature was raised to 50°C, and the reaction was stirred for 2 hours;

[0054] After the above stirring reaction is completed, continue to add hydrogen peroxide with 5% starch emulsion mass to the reaction kettle, heat up to 75°C, keep stirring and react for 40min, filter and separate to obtain the filter residue after the reaction is completed, and put it in an oven. Dried for 2 hours to obtain a dried product, which is pretreated starch, for subsequent use;

[0055] Preparation of modified starch:

[0056] Mix polyvinyl alcohol and deionized water at a mass ratio o...

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Abstract

The invention discloses a preparation method of a high-bonding-strength waterproof starch-based wood adhesive, and belongs to the technical field of adhesive preparation. The preparation method comprises the following steps: firstly, mixing corn starch with water to obtain a starch emulsion, adding tartaric acid for acidolysis, carrying out hydrogen peroxide oxidation to obtain pretreated corn starch, then preparing a polyvinyl alcohol solution, mixing the polyvinyl alcohol solution with the pretreated starch, then adding maleic anhydride for reaction to obtain modified starch, mixing the modified starch with a sodium silicate solution, reacting under the action of hydrochloric acid, carrying out high-temperature stirring treatment to obtain a reactant, and finally, mixing reactants, isocyanate and other raw materials for reaction, so that the high-bonding-strength waterproof starch-based wood adhesive is finally prepared. The number of high-reaction-activity groups in the prepared adhesive is large, chemical bonding force can be generated between the high-reaction-activity groups and active groups on the surface of wood, the bonding strength is improved, and the good waterproof performance is achieved.

Description

technical field [0001] The invention discloses a preparation method of a high bonding strength waterproof starch-based wood glue, which belongs to the technical field of adhesive preparation. Background technique [0002] Starch adhesives are adhesives made from starch gelatinization or starch derivatives. Starch is a high molecular weight carbohydrate, a polysaccharide composed of a single type of sugar unit. [0003] Amylose: a linear polymer linked by α-1,4-glycoside bonds. Amylopectin: It is a highly branched polymer with a side chain structure connected by α-1,6-glucoside bonds on the starch chain. Modified starch: Use physical, chemical or enzymatic methods to change the structure or size of starch molecules to change the properties of starch. This phenomenon is called starch denaturation, and the factors that cause denaturation are called denaturing factors (denaturing agents). The resulting product is called modified starch. Oxidized starch adhesive: The main oxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J151/02C09J11/04C09J11/06C08F251/00C08F222/06
CPCC08F251/00C08K2201/011C09J11/04C09J11/06C09J151/02C08K3/36C08K5/29C08K5/092C08F222/06
Inventor 马科
Owner 马科
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