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Adhesive for starch modified vinyl acetate wooden veneer veneering and preparation method of adhesive

A vinyl acetate wood and starch modification technology, which is applied in the direction of adhesives, adhesive types, grafted polymer adhesives, etc., can solve the problems of increased working hours and energy consumption, grainy surface, long surface drying time, etc. problem, achieve the effect of saving man-hours and energy, reducing consumption, and good wettability

Inactive Publication Date: 2015-12-23
顶立新材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to address the deficiencies of the existing vinyl acetate graft modified starch adhesives. One is that a large amount of concentrated hydrochloric acid is added during the starch acid hydrolysis process to cause yellowing of the product; the other is to improve the initial viscosity of the starch adhesive. The polyvinyl alcohol solution will increase the working hours and energy consumption; the third is to increase the storage stability of the product, urea is generally added, causing the surface of the customer to have a grainy feel during the veneering process, and the surface drying time is too long

Method used

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  • Adhesive for starch modified vinyl acetate wooden veneer veneering and preparation method of adhesive
  • Adhesive for starch modified vinyl acetate wooden veneer veneering and preparation method of adhesive
  • Adhesive for starch modified vinyl acetate wooden veneer veneering and preparation method of adhesive

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1. Formula total amount=1000Kg

[0025]

[0026]

[0027] Prepare starch-modified vinyl acetate adhesive according to the following process:

[0028] a. Dissolve 1.5kg of ammonium persulfate in 28.5kg of water to obtain ammonium persulfate solution; dissolve 4kg of sodium hydroxide in 14kg of water to obtain 18kg of sodium hydroxide solution; mix and stir 90kg of vinyl acetate and 5kg of methacrylic acid into 95kg mixed monomer;

[0029] b. Add 300kg of water to the reaction kettle, start stirring, add 0.5kg of BYK024, add 160kg of cornstarch, heat up to 60°C, add 8kg of concentrated hydrochloric acid, acidify the starch milk in a strong acidic environment for 50 minutes, and then add step a Adjust the pH of the system to 4-5 with the prepared sodium hydroxide solution; add the remaining 325.2kg of water, 20kg of PVA17-88, and 20kg of PVA24-88, raise the temperature to 90°C and keep it for 50 minutes to dissolve the polyvinyl alcohol and further gelati...

Embodiment 2

[0036] Embodiment 2. Formula total amount=1000Kg

[0037]

[0038] Prepare starch-modified vinyl acetate adhesive according to the following process:

[0039] a, 1.8kg ammonium persulfate is dissolved in 34.2kg water, obtains initiator aqueous solution; 5kg sodium hydroxide is dissolved in 15kg water, obtains 20kg sodium hydroxide solution; 99kg vinyl acetate, 6kg methacrylic acid are mixed and stirred to form 105kg mixed monomer;

[0040]b. Add 305kg of water to the reaction kettle, start stirring, add 0.7kg of BYK024, add 85kg of corn starch, 80kg of wheat starch, heat up to 61°C, add 9kg of concentrated hydrochloric acid, and acidify the starch milk in a strong acidic environment for 55 minutes. Then add the sodium hydroxide solution prepared in step a to adjust the pH of the system to 4-5; add the remaining 288.2kg of water, 15kgPVA17-88, 10kgPVA24-88, 20kgPVA17-92, heat up to 91 ° C for 55 minutes, dissolve polyvinyl alcohol, At the same time, further gelatinize the ...

Embodiment 3

[0047] Embodiment 3. Formula total amount=1000Kg

[0048]

[0049]

[0050] Prepare starch-modified vinyl acetate adhesive according to the following process:

[0051] a. Dissolve 2kg of ammonium persulfate in 38kg of water to obtain ammonium persulfate solution; dissolve 6kg of sodium hydroxide in 16kg of water to obtain 22kg of sodium hydroxide solution; mix and stir 108kg of vinyl acetate and 8kg of methacrylic acid to obtain 116kg mixed monomer;

[0052] b. Add 310kg of water to the reaction kettle, start stirring, add 1kg of BYK024, add 100kg of corn starch, 35kg of tapioca starch, 35kg of potato starch, raise the temperature to 62°C, add 10kg of concentrated hydrochloric acid, and acidify the starch milk in a strong acidic environment 60 minutes, then add the sodium hydroxide solution prepared in step a to adjust the pH of the system to 4-5; add the remaining 252kg of water, 40kgPVA17-88, 10kgPVA17-92, heat up to 92°C for 60 minutes, dissolve polyvinyl alcohol, an...

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Abstract

The invention discloses an adhesive for starch modified vinyl acetate wooden veneer veneering. The adhesive mainly comprises starch, concentrated hydrochloric acid, sodium hydroxide, polyvinyl alcohol, emulsifier and the like. The invention further provides a preparation method of the adhesive. According to the method, firstly, part of water is used for dispersing the starch, and then the concentrated hydrochloric acid is added for acidolysis, so that the concentration of hydrogen ions is increased, the use amount of industrial concentrated hydrochloric acid is reduced, the product whiteness is increased; then, a sodium hydroxide solution is used for adjusting the pH value of the system to 4-5, remaining water in the formula is added, the polyvinyl alcohol is added, the temperature is raised to 90-92 DEG C for dissolving so that initial adhesion of a final product can be improved, then cooling is conducted, and the seed emulsion polymerization technology is adopted for carrying out the graft copolymerization modification technology on the starch. Finally, the starch modified vinyl acetate adhesive having the advantages of being good in initial adhesion, free of toxins and pollution, high in adhesion strength, milky white in color, bright, high in drying speed, loose in construction brushability, long in storage time and the like is obtained, and the adhesive can be widely used for adhesion of wood, wooden veneer veneering and artificial boards.

Description

technical field [0001] The invention relates to an adhesive preparation technology, in particular to an adhesive for starch-modified vinyl acetate veneer veneer and a preparation method thereof. Background technique [0002] There is a veneer veneer technology on the market, which is to laminate beech, rosewood, red sandalwood, walnut, teak, ash and cherry wood on the surface of MDF, blockboard and ordinary wood. The veneer of precious natural tree species. The veneer maintains the natural texture and color of precious tree species, and through the lamination of natural veneer with MDF, blockboard and ordinary wood, the added value of the product is improved, and at the same time, the dependence on the consumption of pure solid wood furniture is reduced. In order to achieve the bonding between the veneer and the substrate, a special adhesive is required. The veneer glue is a kind of manual veneering mainly used for convex arc surfaces, manual veneering of technology, specia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J151/00C08F291/08C08F218/08C08F220/06
Inventor 刘维均罗平徐建宋志强牟海燕
Owner 顶立新材料科技股份有限公司