Wood adhesive and preparation method thereof

A technology of wood adhesives and additives, applied in the direction of adhesive additives, monocarboxylate copolymer adhesives, adhesive types, etc., can solve toughness, poor freeze-thaw resistance stability, and adhesive layer strength Great impact, speed up the side reaction rate and other issues, to achieve the effect of improving storage stability, good product stability, and good resistance to thawing

Inactive Publication Date: 2018-04-20
JIANGMEN DINGSHI ADHESIVE INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This two-component panel glue has high strength and excellent water resistance, and is especially suitable for the bonding of hard wood. However, the single modified isocyanate curing agent has a slow reaction rate at room temperature, which affects production efficiency. Increase the reaction rate, but also speed up the side reaction rate, which has a great impact on the strength of the adhesive layer. In addition, the amount of curing agent is large and the degree of crosslinking is large. Although the bonding strength is improved, the toughness and freeze-thaw stability are not good.

Method used

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  • Wood adhesive and preparation method thereof

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Embodiment 1

[0043]

[0044] The above raw materials are commercially available, wherein the defoamer is mineral oil, the preservative is benzoxazolones, the thixotropic agent is fumed silica, and the cross-linking agent A is polymethylene phenyl isocyanate. Agent B is polymethylene polyphenylisocyanate.

[0045] Weigh the raw materials according to the above weight ratio, add deionized water into the reactor, slowly add defoamer, hydroxyl-terminated polybutadiene, PVA at a stirring rate of 100r / min, keep the stirring rate constant, and raise the temperature to 80 ℃, slowly add hydroxyethyl cellulose and cross-linking agent A, then stir at constant temperature and speed for 2 hours, then lower the temperature to 60°C, add polyvinyl acetate emulsion, stir for 30 min at a stirring speed of 500r / min, and slowly add cross-linking agent B. Stir for 2 hours, then add thixotropic agent and preservative, stir for 1 hour at a stirring rate of 800r / min, take samples for inspection, filter, and di...

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Abstract

The invention discloses a wood adhesive. The wood adhesive comprises the following raw materials in percentages by weight: 65% to 75% of a polyvinyl acetate emulsion, 1% to 3% of PVA, 1% to 4% of hydroxyethyl cellulose, 5% to 10% of hydroxyl-terminated polybutadiene, 10% to 20% of deionized water, 0.5% to 2% of an additive, 0.5% to 1% of a cross-linking agent A and 3% to 6% of a cross-linking agent B. The invention also discloses a preparation method of the wood adhesive. The wood adhesive disclosed by the invention is high in stability, high in curing speed, convenient in construction and high in production efficiency, and has excellent tenacity, relatively high compression shear strength and high frost melting resistance and water resistance after curing.

Description

technical field [0001] The invention relates to a wood adhesive, in particular to a wood adhesive and a preparation method thereof. Background technique [0002] With the changes in the wood raw material market, the supply of wood materials in my country has shifted from traditional solid wood to glued wood materials. Traditional wood adhesives are dominated by cheap aldehyde adhesives such as urea-formaldehyde resins, phenolic resins, and melamine-formaldehyde resins, which have very strict requirements on the moisture content of wood, and will produce toxic formaldehyde when used, which is harmful to human health and the natural environment. cause harm. With the improvement of people's awareness of indoor environmental safety and environmental protection, industrial formaldehyde-free wood adhesives have received more and more attention. [0003] The earliest used polyvinyl acetate emulsion, also known as white latex, is difficult to meet the needs of use and the current ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J131/04C09J175/04C09J11/04C09J11/06C09J11/08
CPCC09J131/04C08L2205/035C09J11/04C09J11/06C09J11/08C08L29/04C08L1/284C08L47/00C08L91/00C08L75/04C08K13/02C08K3/36C08K3/346C08K5/29
Inventor 丁佩琴
Owner JIANGMEN DINGSHI ADHESIVE INDAL
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