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A kind of preparation method of polyurethane adhesive for wood

A polyurethane adhesive, wood technology, applied in the direction of polyurea/polyurethane adhesives, lignocellulosic material adhesives, adhesives, etc., can solve the problems of poor resistance to yellowing and aging, insufficient bonding strength, and insufficient environmental protection. , to achieve good strength and toughness, improve yellowing and aging resistance, and good weather resistance.

Active Publication Date: 2018-07-31
SHANGHAI JINQIANG ADHESIVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polyurethane adhesive has certain defects: poor yellowing and aging resistance, insufficient bonding strength, poor heat resistance, and not environmentally friendly

Method used

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  • A kind of preparation method of polyurethane adhesive for wood

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The preparation method of polyurethane adhesive for wood, its step is as follows:

[0025] (1) After the mulberry fiber is ground, cross a 60-mesh sieve, place it in a constant temperature drying oven and dry it at 90°C for 5 hours, add a mass concentration of 2% sodium hydroxide solution, the weight of the mulberry fiber and sodium hydroxide solution The volume ratio is 1:20g / mL, stirred in a water bath at 90°C for 2 hours, filtered after discharge, washed the filter residue with water until the filtrate is neutral, and dried in a constant temperature drying oven at 90°C to constant weight to obtain alkalized mulberry bark fiber;

[0026] (2) Add mica iron oxide powder with a weight ratio of 2:3 and the alkalized mulberry fiber obtained in step (1) into ethanol and ultrasonically vibrate for 1 hour to obtain a mixed solution, and hydrolyze KH-570 with deionized water for 30 minutes After that, add it to the aforementioned mixture, stir it magnetically at 85°C for 1 ho...

Embodiment 2

[0029] The preparation method of polyurethane adhesive for wood, its step is as follows:

[0030] (1) After the mulberry fiber is ground, cross a 60-mesh sieve, place it in a constant temperature drying oven and dry it at 90°C for 5 hours, add a mass concentration of 2% sodium hydroxide solution, the weight of the mulberry fiber and sodium hydroxide solution The volume ratio is 1:20g / mL, stirred in a water bath at 90°C for 2 hours, filtered after discharge, washed the filter residue with water until the filtrate is neutral, and dried in a constant temperature drying oven at 90°C to constant weight to obtain alkalized mulberry bark fiber;

[0031] (2) Add mica iron oxide powder with a weight ratio of 2:3 and the alkalized mulberry fiber obtained in step (1) into ethanol and ultrasonically vibrate for 1 hour to obtain a mixed solution, and hydrolyze KH-570 with deionized water for 30 minutes After that, add it to the aforementioned mixture, stir it magnetically at 85°C for 1 ho...

Embodiment 3

[0034] The preparation method of polyurethane adhesive for wood, its step is as follows:

[0035] (1) After the mulberry fiber is ground, cross a 60-mesh sieve, place it in a constant temperature drying oven and dry it at 90°C for 5 hours, add a mass concentration of 2% sodium hydroxide solution, the weight of the mulberry fiber and sodium hydroxide solution The volume ratio is 1:20g / mL, stirred in a water bath at 90°C for 2 hours, filtered after discharge, washed the filter residue with water until the filtrate is neutral, and dried in a constant temperature drying oven at 90°C to constant weight to obtain alkalized mulberry bark fiber;

[0036] (2) Add mica iron oxide powder with a weight ratio of 2:3 and the alkalized mulberry fiber obtained in step (1) into ethanol and ultrasonically vibrate for 1 hour to obtain a mixed solution, and hydrolyze KH-570 with deionized water for 30 minutes After that, add it to the aforementioned mixture, stir it magnetically at 85°C for 1 ho...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Abstract

The invention provides a method for preparing a polyurethane adhesive for wood. The steps are as follows: (1) Grind mulberry fiber and sieve it, dry it, add it to a sodium hydroxide solution, stir it in a water bath, filter it after discharge, and dry it to a constant weight , to obtain alkalized mulberry fiber; (2) adding mica iron oxide powder and alkalized mulberry fiber to ethanol to obtain a mixed solution, adding KH-570 to the mixed solution after hydrolysis, magnetic stirring, and drying after suction filtration to obtain Compound; (3) 50-65 parts of polyurethane prepolymer, 1-2 parts of defoamer, 2-3 parts of solvent are added to the stirring tank for stirring, and after heating, continue to stir, and 6-8 parts of plasticizer, 15- Add 20 parts of filler, 0.5-1 part of coupling agent and 10-15 parts of compound into the stirring tank, continue stirring after heating, lower the temperature, add 0.5-1 part of catalyst into the stirring tank, continue stirring for 40 minutes, and obtain wood after discharging Polyurethane adhesive. The polyurethane adhesive prepared by the invention has good yellowing and aging resistance, bonding strength, heat resistance and environmental protection performance.

Description

Technical field: [0001] The invention relates to an adhesive, in particular to a preparation method of a polyurethane adhesive for wood. Background technique: [0002] With the sharp reduction of forest resources in the world and the implementation of China's natural forest resources protection project, small wood panels require adhesives with better bonding strength and durability than wood itself. The amount of adhesive used has become a sign to measure the technical development level of the wood industry. In the past, most of the wood adhesives used by people were urea-formaldehyde resin, phenolic resin and melamine-formaldehyde resin with formaldehyde as the main raw material. However, due to the presence of free formaldehyde, the product will gradually emit formaldehyde gas to the surroundings during use, causing environmental pollution. The wood processing industry has begun to turn its attention to the new environmentally friendly adhesive polyurethane glue in order ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/04C09J197/02C09J11/04
Inventor 李晓明
Owner SHANGHAI JINQIANG ADHESIVE
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