Seam cracking prevention hot pressing wooden veneering adhesive and preparation method thereof

An adhesive and veneer technology, applied in the direction of adhesives, graft polymer adhesives, adhesive types, etc., can solve the problems of affecting product quality, existence of formaldehyde release, endangering the health of users, etc., to reduce external emulsification The effect of improving adhesive strength and improving adhesive strength

Inactive Publication Date: 2016-11-02
TAIZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of veneer veneer adhesive is inconvenient to use, the hot-pressing temperature is too high, the energy consumption is high, the hot-pressing time is long, and formaldehyde is released during processing and later use, polluting the environment and seriously endangering the health of users
Polyvinyl acetate emulsion is used for veneer veneer, which is environmentally friendly, high strength, and convenient to use. However, when ordinary vinyl acetate adhesives are used for veneer veneer, cracks will occur at the splicing seams, which will affect product quality.

Method used

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  • Seam cracking prevention hot pressing wooden veneering adhesive and preparation method thereof
  • Seam cracking prevention hot pressing wooden veneering adhesive and preparation method thereof
  • Seam cracking prevention hot pressing wooden veneering adhesive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1 Total amount=1000kg

[0024]

[0025]

[0026] Production Process:

[0027] a, 1kg ammonium persulfate is dissolved in 19kg water to obtain 20kg ammonium persulfate aqueous solution;

[0028] b. Mix and stir 287.4kg vinyl acetate, 5kg methacrylic acid, 2kg polyethylene glycol (400) diacrylate and 8kg N-hydroxyethyl acrylamide to form 302.4kg mixed monomer;

[0029] c. Add 487kg of water, 1kg of defoamer F681, and 1kg of sodium bicarbonate into the reaction kettle, start stirring, add 40kg of PVA2488, 10kg of PVA1788, raise the temperature to 90°C and keep it for 50 minutes to dissolve polyvinyl alcohol. Then cool down to 73°C, add 12.6kg of vinyl acetate, stir and emulsify for 5 minutes, add 10kg of the ammonium persulfate aqueous solution prepared in step a, and incubate at 78°C for 20 minutes;

[0030] d. After the condenser has no reflux, start to drop the 302.4kg mixed monomer prepared by step b and the ammonium persulfate aqueous solution prepa...

Embodiment 2

[0032] Embodiment two total amount=1000kg

[0033]

[0034]

[0035] Production Process:

[0036] A, 1.1kg ammonium persulfate is dissolved in 20.9kg water, obtains 22kg ammonium persulfate aqueous solution;

[0037] b. Mix and stir 292.1kg vinyl acetate, 6kg methacrylic acid, 3kg polyethylene glycol (400) diacrylate and 9kg N-hydroxyethyl acrylamide to form 310.1kg mixed monomer;

[0038] c. Add 459.7kg of water, 1.1kg of defoamer F681, and 1.1kg of sodium bicarbonate into the reactor, start stirring, add 35kg of PVA2488, 18kg of PVA1788, raise the temperature to 91°C and keep it for 55 minutes to dissolve polyvinyl alcohol. Then cool down to 73°C, add 12.9kg of vinyl acetate, stir and emulsify for 5 minutes, add 11kg of ammonium persulfate aqueous solution prepared in step a, and keep warm at 78°C for 20 minutes;

[0039] d. After the condenser has no reflux, start to drop the 310.1kg mixed monomer prepared by step b and the ammonium persulfate aqueous solution prepa...

Embodiment 3

[0041] Embodiment three total amount=1000kg

[0042]

[0043]

[0044] Production Process:

[0045] A, 1.2kg ammonium persulfate is dissolved in 22.8kg water, obtains 24kg ammonium persulfate aqueous solution;

[0046] b. Mix and stir 296.7kg vinyl acetate, 8kg methacrylic acid, 4kg polyethylene glycol (400) diacrylate and 10kg N-hydroxyethylacrylamide to form 318.7kg mixed monomer;

[0047] c. Add 432.4kg of water, 1.2kg of defoamer F681, and 1.2kg of sodium bicarbonate into the reactor, start stirring, add 35kg of PVA2488, 20kg of PVA1788, raise the temperature to 92°C and keep it for 60 minutes to dissolve polyvinyl alcohol. Then cool down to 73°C, add 13.3kg of vinyl acetate, stir and emulsify for 5 minutes, add 12kg of ammonium persulfate aqueous solution prepared in step a, and incubate at 78°C for 20 minutes;

[0048] d. After the condenser has no reflux, start to drop the 318.7kg mixed monomer prepared by step b and the ammonium persulfate aqueous solution prepar...

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PUM

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Abstract

The invention discloses a seam cracking prevention hot pressing wooden veneering adhesive and a preparation method thereof. The adhesive mainly comprises water, polyvinyl alcohol, an antifoaming agent F681, sodium bicarbonate, ammonium persulfate, vinyl acetate, methacrylic acid, a chain extender, self-crosslinking monomers, a curing agent, a catalyst, cross-linked starch, an adherence promoter, a TXIB plasticizer and an BIOBAN ULTRABIT antiseptic. The chain extender is used in the preparation process to increase the molecular weight of latex particles and reduce influences of chain transfer of system chain free radicals to an initiator and a reaction system on the molecular weight, and hydrazide, maltose and other assistants are added to a copolymerization emulsion and are mixed to prepare the hot pressing wooden veneering adhesive, so the cracking problem of common hot pressing wooden veneering adhesives in wooden seams is solved, and the product quality is improved.

Description

technical field [0001] The invention relates to an adhesive preparation technology, in particular to a seam cracking-proof hot-pressed veneer veneer adhesive and a preparation method. Background technique [0002] With the continuous increase of wood consumption, the contradiction between supply and demand has become increasingly prominent. Accelerating the development of wood conservation and substitution is of great significance to meet market demand, curb excessive forest logging, maintain ecological balance, and promote sustainable use of forest resources. As the best substitute product for logs, veneer comes out along the market. Wood veneer is a kind of thin wood veneer or veneer material with the characteristics of precious tree species, most of the tree species can be made of wood veneer. Natural veneer has the natural and simple fragrance of wood, strong texture, and its special and irregular natural texture has a superb and ingenious artistic charm. Natural vene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J151/06C09J11/08C08F261/04C08F218/08C08F220/06C08F220/58
CPCC09J151/06C08F261/04C09J11/08C08L3/04C08F218/08C08F220/06C08F220/58
Inventor 刘维均章勇生罗平徐建宋志强牟海燕
Owner TAIZHOU UNIV
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