Adhesive, and artificial board prepared by using same

A technology for adhesives and wood-based panels, applied in adhesive types, vinyl ether copolymer adhesives, adhesives, etc., can solve problems such as energy consumption, easy aging of boards, and formaldehyde release

Active Publication Date: 2021-05-28
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method does not fundamentally solve the problem, and the board still releases formaldehyde during use.
[0004] Adhesives prepared based on biomass materials such as soybean protein, tannin, starch, and gelatin do not involve the use of formaldehyde, but the degradation rate of biomass materials is fast, which brings the problem of easy aging of the board
Although the degradation can be delayed to a certain extent by adding anti-aging agents, biomass material adhesives still have high cost and resource problems
This also limits its practical use
[0005] In addition, polymers such as polyvinyl chloride, high molecular weight polyethylene, and neoprene can also be used for the production of plates, but these polymers are not water-soluble and cannot form water-based adhesives. Solvents mix the polymer with the wood raw material, which still has the disadvantages of high cost, energy consumption and environmental friendliness

Method used

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  • Adhesive, and artificial board prepared by using same
  • Adhesive, and artificial board prepared by using same
  • Adhesive, and artificial board prepared by using same

Examples

Experimental program
Comparison scheme
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preparation example Construction

[0134] The preparation method of wood-based panel

[0135] Another aspect of the invention relates to a method of producing wood-based panels, said method comprising the use of the adhesive of the invention.

[0136] According to one embodiment of the invention, the method comprises pressing the mixture of lignocellulosic material and the binder of the invention at a temperature of 105-300° C. and a pressure of 0.4-10 MPa, preferably for 2-60 minutes, more preferably pressing for 3-30 minutes, such as 5-30 minutes.

[0137] The mixture of lignocellulosic material and binder of the invention for pressing can be prepared by mixing lignocellulosic material with the binder of the invention. When the binder is solid, the binder may first be dissolved in water before mixing with the lignocellulosic material.

[0138] Prior to pressing, it is preferred to remove some of the moisture in the mixture of lignocellulosic material and binder, for example to reduce the moisture content ...

Embodiment 1

[0148] According to the mass parts, 13 parts of styrene, 12.25 parts of maleic anhydride, 300 parts of ethyl acetate and 0.2 parts of AIBN were mixed and dissolved, and the system was reacted at 70° C. for 6 hours after passing nitrogen gas for 20 minutes. After the product is precipitated with 400 parts of ethanol, it is centrifuged, washed three times with sherwood oil, and dried to obtain the styrene-maleic anhydride copolymer (weight average molecular weight is 72000) in the form of white powder. The yield is 94%, and the maleic anhydride in the copolymer is The mass percentage of monomer units is 44%.

[0149] With 20 parts of this styrene-maleic anhydride copolymer, 5 parts of 37% ammoniacal liquor, 75 parts of water were stirred at room temperature for 4 hours, obtained the styrene-maleamic acid copolymer viscous liquid (copolymer) of mass concentration 20%. The mole percent of the maleic anhydride monomer units that have been ammonolyzed in the mixture is 99%). Mix th...

Embodiment 2

[0152] According to the mass parts, 100 parts of C 4 Distillate (composition shown in Table 1), 30 parts of maleic anhydride, 100 parts of isoamyl acetate and 2 parts of BPO were mixed and dissolved, and the system was reacted at 70° C. for 8 hours after passing nitrogen gas for 20 minutes. The product was centrifuged, washed three times with petroleum ether, and dried to obtain C in the form of a white powder. 4 -maleic anhydride copolymer (weight average molecular weight is 20000), the yield is 94%, and the mass percent of maleic anhydride monomer unit in the copolymer is 63%.

[0153] 10 copies of the C 4 -Maleic anhydride copolymer, 5 parts of 37% ammonia water, 85 parts of water were stirred at room temperature for 4 hours to obtain 10% mass concentration of C 4 -Maleamic acid copolymer (99% by mole of aminolyzed maleic anhydride monomer units in the copolymer) viscous liquid. The viscous liquid is uniformly mixed with poplar wood shavings (water content 5%, 5-10 mesh)...

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Abstract

The invention relates to an adhesive. The adhesive comprises at least one copolymer A, the copolymer A has at least one repeating unit bearing an amide group with a carboxyl group and/or an ammonium salt thereof and at least one other repeating unit different from the repeating unit bearing an amide group with a carboxyl group and/or an ammonium salt thereof. The invention also relates to a wood-based panel formed from lignocellulosic material and the adhesive, and a manufacturing method thereof.

Description

technical field [0001] The present disclosure relates to an adhesive comprising at least one copolymer having recurring units bearing amide groups and carboxyl groups and / or ammonium salts thereof and other recurring units. The present disclosure also relates to wood-based panels formed from lignocellulosic materials and said binders and methods of making wood-based panels. Background technique [0002] In the current wood-based panel production, "trialdehyde glue" (urea-formaldehyde resin, phenolic resin and melamine-formaldehyde resin) prepared from formaldehyde occupies a large proportion, exceeding 80%. "Trialdehyde glue" is easy to prepare and cheap, but this type of board will release free formaldehyde for a long time during use, polluting the indoor environment and seriously threatening the health of residents. [0003] Some documents have proposed solutions to reduce the formaldehyde release of "trialdehyde glue" type wood-based panels. For example, CN107033309 A at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J135/06C09J135/00C09J135/08B27N3/00B27N3/04B27N3/08
CPCC09J135/06C09J135/00C09J135/08B27N3/002B27N3/04B27N3/08
Inventor 杨万泰徐灿赵长稳陈楚轩陈冬马育红
Owner BEIJING UNIV OF CHEM TECH
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