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Adhesive for plywood and preparation method thereof

A technology for plywood and adhesives, applied in the directions of adhesives, adhesive types, rosin adhesives, etc., can solve the problems of poor adhesion performance, high cost of use, less artificial boards, etc., and achieve adhesion strength and water resistance. High, simple manufacturing process and equipment, and the effect of avoiding the harm of formaldehyde

Active Publication Date: 2015-12-09
广州市北林林产工业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although formaldehyde-free adhesives do not cause the release of free formaldehyde from wood-based panel products and have good safety performance, due to high cost of use or / and poor adhesion performance, the production of wood-based panels is less used

Method used

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  • Adhesive for plywood and preparation method thereof
  • Adhesive for plywood and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 500g of water into a three-neck flask equipped with an electric stirrer and a thermometer, heat it in a water bath to 50°C, add 60g of polyvinyl alcohol of model 2488 under stirring, and continue to heat up to 95°C to completely dissolve the polyvinyl alcohol. Then add 35g of sodium silicate water glass with a silicon dioxide content of 28% and stir evenly, then add the mixture of 7.5g of crushed gum rosin and 7.5g of polymerized rosin in 3 times, each time at an interval of 10 minutes, and then add K12 for emulsification Add 0.5 g of the solution, keep the temperature at 90°C for 30 minutes, and cool to room temperature. Add 50g of silica sol with a silica content of 30% and stir evenly, slowly add a sulfuric acid solution made of sulfuric acid and water in a weight ratio of 1:1 to adjust the pH value to 6.5, and then dropwise add γ-methacryloyloxy 1 g of propyltrimethoxysilane and 0.5 g of γ-glycidoxypropyltrimethoxysilane were stirred and dispersed evenly, and th...

Embodiment 2

[0031] Add 1000kg of water into the reaction kettle, raise the temperature to 60°C, add 160kg of polyvinyl alcohol (type 1788) under stirring, and continue to heat up to 90°C to completely dissolve the polyvinyl alcohol. Then adding silicon dioxide content is 24% water glass 75kg and stirs evenly, then adds the gum rosin 40kg that pulverizes in 3 times equally, every interval 10 minutes, adds K12 emulsifying agent 1kg and NP-10 emulsifying agent 0.25kg again, Keep the temperature at 90°C for 25 minutes and cool to room temperature. Add 100kg of silica sol with a silica content of 20% and stir evenly, slowly add acetic acid to adjust the pH value to 7.0, then dropwise add 8kg of γ-methacryloxypropyltrimethoxysilane and stir to disperse evenly, continue stirring for 3.5 Hours, filtered and discharged for later use. Before use, according to the viscosity requirement, add peanut shell powder whose weight is 3% of the weight of the feed liquid and stir evenly to obtain an adhesive...

Embodiment 3

[0033] Add 1200kg of water into the reactor, raise the temperature to 60°C, add 100kg of polyvinyl alcohol of type 1799 and 60kg of polyvinyl alcohol of type 2499 under stirring, and continue to heat up to 92°C to completely dissolve the polyvinyl alcohol. Then add 100kg of water glass with a silicon dioxide content of 28% and stir evenly, then add 40kg of pulverized hydrogenated rosin in 3 times, each time at an interval of 15 minutes, then add 1.5kg of LAS emulsifier, and keep the temperature at 90°C for 30 minutes. , cooled to room temperature. Add 120kg of silica sol with a silicon dioxide content of 35% and stir evenly, slowly add sulfuric acid and water in a weight ratio of 1:1 to adjust the pH value to 7.0, and then dropwise add gamma-glycidoxypropyl 6.5 kg of trimethoxysilane was stirred and dispersed evenly, and the stirring was continued for 5 hours, and the material was filtered and discharged for later use. Before use, add mica powder (130 meshes) whose weight is ...

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Abstract

The invention discloses a binding agent for a plywood. The binding agent is mainly prepared from the following raw materials in parts by weight: 50-120 parts of water, 6-20 parts of polyvinyl alcohol, 3.5-10 parts of water glass, 1.5-5 parts of rosin resin, 0.05-0.2 part of emulsifying agents, 5-15 parts of silicon sol and 0.15-0.8 part of organic silicon modifying agent. The preparation method comprises the following steps of: heating the water to 50-60 DEG C, adding the polyvinyl alcohol, then adding the water glass after the polyvinyl alcohol is dissolved, and uniformly stirring; adding the crushed rosin resin, then adding the silicon sol, and uniformly stirring; then slowly adding an acid compound to regulate a pH value to 6.5-7.0; then dropwise adding the organic silicon modifying agent, uniformly stirring and dispersing, continuously stirring for 3-5 hours, and filtering to obtain a material for later use; after the material is used, adding fillers which account for 2%-5% of the weight of material liquid, and uniformly stirring to obtain the binding agent for the plywood. The product, namely the binding agent for the plywood, is high in binding strength and water resistance and good in storage stability, prevents the harmfulness of formaldehyde and is simple in manufacturing process and equipment.

Description

technical field [0001] The invention belongs to the technical field of adhesives, and relates to wood adhesives, in particular to an adhesive for plywood and a preparation method thereof. Background technique [0002] Formaldehyde-containing adhesives such as urea-formaldehyde, phenolic formaldehyde, and melamine formal have good adhesion to wood materials and low prices, so they are widely used in the production of wood-based panels. Although formaldehyde-free adhesives do not cause the release of free formaldehyde from wood-based panel products and have good safety performance, due to the high cost of use or / and poor adhesion performance, the production of wood-based panels is less used. Common forms of formaldehyde-free adhesives that have been used in plywood production include isocyanate, acrylic emulsion, two-component water-based polyurethane adhesive, modified soybean glue, and hot melt adhesive for plywood. Contents of the invention [0003] The technical problem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J129/04C09J1/02C09J1/00C09J193/04C09J11/06
Inventor 王文涛吴子良莫丽华左艳仙
Owner 广州市北林林产工业有限公司
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