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Preparation method of high-strength environment-friendly wood plywood

A kind of wood plywood, high-strength technology, applied in the joint of wooden veneers, other plywood/plywood appliances, adhesives, etc., can solve the problems of unguaranteed mechanical properties and hazards of wood plywood, and achieve easy tight and firm combination, Effects of cost reduction and usage reduction

Active Publication Date: 2021-07-27
湖南福森竹木科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the mechanical properties of plywood, it is necessary to add adhesives. At present, the adhesives used in plywood are often white latex or universal glue (309 glue), which contain a large amount of formaldehyde and volatile organic compounds, which are harmful to the human body. There is great harm, and if you choose an environmentally friendly adhesive, the mechanical properties of the wood plywood cannot be guaranteed.

Method used

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  • Preparation method of high-strength environment-friendly wood plywood
  • Preparation method of high-strength environment-friendly wood plywood

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A kind of preparation method of high-strength environment-friendly plywood:

[0027] Mix isophorone diisocyanate, polycarbonate diol, epoxy resin, and dibutyltin dilaurate evenly, then heat up to 70°C, react for 2 hours, and mix 2,2-dimethylolpropionic acid and 1,4- The composite chain extender composed of butanediol in a mass ratio of 1:1 was dissolved in acetone and added to the reaction system, continued to react for 5 hours, cooled to 40°C, added hydroxyethyl acrylate and continued to react for 2 hours, and then added tetraethyl ammonium hydroxide, add water after stirring for 10 minutes, and finally disperse at a high speed for 1 hour to obtain a water-based polyurethane emulsion. Add gelatinized starch to a sodium hypochlorite solution with a mass concentration of 10%, heat up to 90°C for 3 hours, filter, wash and dry to obtain oxidized After the gelatinized starch, mix it with polyvinyl alcohol, potassium persulfate, water, heat up to 65 ° C, stir for 5 hours, co...

Embodiment 2

[0029] A kind of preparation method of high-strength environment-friendly plywood:

[0030]Mix isophorone diisocyanate, polycarbonate diol, epoxy resin, and dibutyltin dilaurate evenly, then heat up to 60°C, react for 1 hour, and mix 2,2-dimethylolpropionic acid and 1,4- The composite chain extender composed of butanediol in a mass ratio of 1:1 is dissolved in acetone and added to the reaction system, and the reaction is continued for 3 hours, the temperature is lowered to 40°C, the end-capping agent hydroxyethyl acrylate is added to continue the reaction for 1 hour, and then tetraethyl ammonium hydroxide, add water after stirring for 5 minutes, and finally disperse at high speed for 1 hour to obtain water-based polyurethane emulsion. After the gelatinized starch, mix it with polyvinyl alcohol, potassium persulfate, water, heat up to 60 ° C, stir for 5 hours, cool down to 40 ° C and add chitosan and mannitol, the oxidized gelatinized starch, poly The mass ratio of vinyl alcoh...

Embodiment 3

[0032] A kind of preparation method of high-strength environment-friendly plywood:

[0033] Mix isophorone diisocyanate, polycarbonate diol, epoxy resin, and dibutyltin dilaurate evenly, then heat up to 75°C, react for 2 hours, and mix 2,2-dimethylolpropionic acid and 1,4- The composite chain extender composed of butanediol in a mass ratio of 1:1 was dissolved in acetone and added to the reaction system, continued to react for 5 hours, cooled to 45°C, added end-capping agent hydroxyethyl acrylate and continued to react for 2 hours, and then added tetraethyl ammonium hydroxide, add water after stirring for 10 minutes, and finally disperse at high speed for 2 hours to obtain water-based polyurethane emulsion. The final gelatinized starch was mixed with polyvinyl alcohol, potassium persulfate, and water, heated to 70°C, stirred for 10 hours, cooled to 50°C, chitosan and mannitol were added, and the oxidized gelatinized starch, poly The mass ratio of vinyl alcohol and chitosan is...

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Abstract

The invention relates to the field of building materials, in particular to a preparation method of a high-strength environment-friendly wood plywood. The preparation method comprises the steps of uniformly mixing an adhesive, dried wood flour, reinforced fibers and a flame retardant in parts by weight to prepare the single-layer wood plywood; carrying out corona treatment on the single-layer wood plywood, and compositing multiple layers of wood plywood slabs; and then carrying out heating treatment. The wood plywood prepared by the preparation method is good in mechanical property, the tensile strength is greater than or equal to 35.2 MPa, the bending strength is greater than or equal to 63.3 MPa, the flexural modulus is greater than or equal to 4810 MPa, the impact strength is greater than or equal to 9.3 kJ / m<2>, ammonia odor is avoided, the formaldehyde emission is less than or equal to 0.5 mg / L, and the wood plywood meets national standards, can be used as an indoor plate, and is more environmentally friendly and healthier.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a preparation method of high-strength environment-friendly wood plywood. Background technique [0002] Wood plywood is a wood-based panel made of wood chips, pulp fibers, peanut shells, bamboo, straw, etc., and processed by a press machine. It can achieve the reuse of waste and improve the utilization rate of wood. In order to improve the mechanical properties of plywood, it is necessary to add adhesives. At present, the adhesives used in plywood are often white latex or universal glue (309 glue), which contain a large amount of formaldehyde and volatile organic compounds, which are harmful to the human body. There is great harm, and if you choose an environmentally friendly adhesive, the mechanical properties of the wood plywood cannot be guaranteed. Contents of the invention [0003] Purpose of the invention: Aiming at the above technical problems, the present invention pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27N3/02B27N3/00B27N3/18B27D1/08B27D5/00C08L97/02C08L1/02C08L75/04C08L3/10C08L29/04C08L5/08C08K3/32C08K3/38C09J175/04C09J11/08C09J11/06C09J103/10C09J129/04C09J105/08C08G18/75C08G18/66C08G18/44C08G18/58C08G18/34C08G18/32C08G18/12C08G18/67C08J7/12
CPCB27N3/02B27N3/002B27N3/18B27D1/08B27D5/00C08L97/02C09J175/04C09J11/08C09J11/06C08G18/755C08G18/4045C08G18/44C08G18/58C08G18/12C08G18/672C08G18/348C08G18/3206C08J7/123C08K2003/322C08K2003/387C08J2397/02C08J2401/02C08J2475/04C08J2403/10C08J2429/04C08J2405/08C08L1/02C08L75/04C08L3/10C08L29/04C08L5/08C08K3/32C08K3/38C08K5/053C08G18/0823C08G18/6659Y02W30/91
Inventor 李业红
Owner 湖南福森竹木科技有限公司
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