Timber adhesive and preparation method thereof

A technology of wood adhesives and compounds, applied in the direction of adhesive types, aldehyde/ketone condensation polymer adhesives, adhesives, etc., can solve the problems of inconvenient operation and high cost, and achieve improved plasticity, adhesion, and adhesion Improved composite strength and water resistance, good storage stability

Active Publication Date: 2012-05-09
东莞市山力高分子材料科研有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the common disadvantages of the above-mentioned adhesives are that the operation is inconvenient during application, and the cost is still relatively high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In a reactor with a stirring device, a thermometer and a reflux device, add 173kg of water, 509kg of 40% glyoxal, 39.5kg of dialdehyde starch with a degree of hydroformylation of 80%, 8kg of polyvinyl alcohol of model 1788 and twelve Sodium alkylbenzene sulfonate 1.5kg, heat up to 90°C, keep warm until the polyvinyl alcohol is completely dissolved; cool down to 80~85°C, add melamine 39.5kg, urea 197kg, add water glass (modulus 3.2, 52Be) to adjust the material pH=8.5, react for 60min., add about 5.5kg of hydrochloric acid solution (1:1 mixed with water), adjust the material pH=5.8, and react for about 50min. until the cloud point is 23°C, add water glass to make the total amount of water glass reach 25kg ; Cool down to 50~60°C, add 2kg of methyltriethoxysilane, react for 30min, when the pH value reaches 7.0, cool down to about 45°C and discharge. The main process parameters for making plywood with the synthesized wood adhesive are: sizing amount 215g / m, aging time 30min...

Embodiment 2

[0025] Add 150kg of water, 555kg of 40% glyoxal, 10kg of polyvinyl alcohol of type 1799 and 2kg of sodium dodecylbenzenesulfonate into the reactor with stirring device, thermometer and reflux device, and heat up to 90°C , keep warm until the polyvinyl alcohol compound is completely dissolved; cool down to 80~85°C, add 240kg of urea, add water glass (modulus 3.2, 52Be) to adjust the pH of the material to 8.0, react for 50min., add 4.5kg of formic acid to adjust the pH of the material to 5.0 , and then react for about 45min. until the cloud point is 23°C, add water glass to make the total amount of water glass reach 36kg; cool down to 50~60°C, take out 20kg of material for comparison example 1 measurement. Continue the reaction for the rest: add 1.5kg of methyltriethoxysilane and 1.5kg of 3-aminopropyltriethoxysilane, react for 20min, when the pH value reaches 7.5, cool down to about 45°C and discharge. The main process parameters for making plywood with the synthetic wood adhes...

Embodiment 3

[0027] In the reactor with stirring device, thermometer and reflux device, add 60kg of water, 480kg of 40% glyoxal, 10kg of polyvinyl alcohol of 1799 and 1.5kg of sodium dodecylbenzenesulfonate, and heat up to 80 ℃, keep warm until the polyvinyl alcohol compound dissolves completely; cool down to 80~85℃, add 240kg of urea, add 50kg of water glass (modulus 3.2, 52Be) to adjust the pH of the material to 8.0, react for 50min., add 12kg of citric acid to adjust the pH of the material =5.0, then react for about 45min. until the cloud point is 23°C, add water glass to make the total amount of water glass reach 36kg; cool down to 50~60°C. And continue the reaction: add 1.5kg of methyltriethoxysilane and 1.5kg of 3-aminopropyltriethoxysilane, react for 20min, when the pH value reaches 7.0, cool down to about 45°C and discharge. The main process parameters for making plywood with the synthesized wood adhesive are: sizing amount 215g / m, aging time 30min, hot pressing conditions: pressur...

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Abstract

The invention discloses a timber adhesive. The adhesive comprises the following components, by weight, 41-60 parts of an aldehyde compound, 22-45 parts of an amino compound, 2-4 parts of an inorganic silicon compound, 0.2-0.5 parts of an organic silicon compound, 0.8-1.5 parts of a polyvinyl alcohol compound, 0.2-1 part of an acid compound, 0.1-0.3 parts of sodium dodecyl benzene sulfonate and 5-32 parts of water. A preparation method of the adhesive comprises the following steps: 1, taking several components according to corresponding weight parts, heating them to 90DEG C, and maintaining the temperature until the polyvinyl alcohol compound is completely dissolved; 2, cooling to 80-85DEG C, adding the amino compound, adding the inorganic silicon compound to adjust the pH value of the obtained material to 7.0-8.5, reacting for 45-75min, adding the acid compound to adjust the pH value of obtained material to 4.8-6.0, reacting for 45-75min, and adding the residual inorganic silicon compound after the cloud point is 23DEG C; and 3, cooling to 50-60DEG C, adding the organic silicon compound, reacting for 15-30min, heating to about 45DEG C when the pH value reaches 7.5-8.5, and discharging. The adhesive synthesized with the preparation method, which is an inorganic-organic silicon modified non-formaldehyde amino resin, has the advantages of high adhesion strength, good water resistance, no use of formaldehyde as an acetal reactant, and avoiding of the formaldehyde harm.

Description

technical field [0001] The invention belongs to the technical field of adhesives, and relates to a wood adhesive, in particular to an inorganic-organosilicon modified non-formaldehyde amino resin wood adhesive. Background technique [0002] Urea-formaldehyde resin belongs to amino resin and is an adhesive widely used in wood-based panels. However, urea-formaldehyde resin adhesives will release formaldehyde, which will pollute the environment and endanger human health. In order to solve its pollution problem, the following solutions are generally adopted, a. Urea-formaldehyde resin with low aldehyde / urea molar ratio is used. When synthesizing urea-formaldehyde resin, appropriately reducing the molar ratio of formaldehyde and urea in raw materials can reduce the free formaldehyde content of resin and wood-based panels to a certain extent; b. Add formaldehyde scavenger. These capture agents can chemically react with formaldehyde under certain conditions to generate another st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J161/32C08G12/40
Inventor 王文涛吴子良左艳仙黄强
Owner 东莞市山力高分子材料科研有限公司
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