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Special adhesive for straw man-made board and preparation of straw man-made board

A technology for wood-based panels and adhesives, applied in the direction of adhesives, adhesive types, polyurea/polyurethane adhesives, etc., can solve the problems of lack of competitiveness, slump of panels, and high production costs, and achieve easy process operation and controlled curing. Speed, the effect of reducing production costs

Active Publication Date: 2015-01-21
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the high production cost leads to lack of competitiveness compared with other similar wood products; the key raw material adhesive cannot meet the needs of normal production, and the problem of sticking boards is prone to occur in the production process of straw wood-based panels; the problem of organic volatiles in the production process; The slab pre-compression is poor, and problems such as loose slabs and slab collapse are prone to occur during the transmission process, which will seriously affect the industrialization level of straw-based panels

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Preparation of special adhesive for formaldehyde-free straw wood-based panels:

[0035] Add acetylacetone to isocyanate, the mass ratio of isocyanate to acetylacetone is 1:1, then add dimethyl sulfoxide and react at 50°C for 4h; The mass ratio is 5:1, the product is naturally cooled, and the new curing agent is obtained from the discharge.

[0036] The formaldehyde-free adhesive, new curing agent, and 35% citric acid solution are prepared according to the mass ratio of 100:10:10 to obtain the special adhesive for wood-based panels.

[0037] 2. Preparation of new environment-friendly formaldehyde-free straw-based panels:

[0038] (1) Straw treatment: the rice straw with a moisture content of 14% is cut into 20-40mm grass sections by a cutting machine, and then separated by gravity to remove impurities and then sent to a hammer mill for hammer milling to be processed into qualified forage. The rotor dryer is dry, and the moisture content is 8%;

[0039] (2) Powder s...

Embodiment 2

[0048] 1. Preparation of special adhesive for formaldehyde-free straw wood-based panels:

[0049] Add methyl methacrylate to isocyanate, the mass ratio of isocyanate to methyl methacrylate is 3:2, then add dimethylformamide and react at 70°C for 3.5h; add butanone oxime and react at 50°C for 2h, The mass ratio of isocyanate to butanone oxime is 3:1, the product is naturally cooled, and the new curing agent is obtained by discharging.

[0050] The formaldehyde-free adhesive, new curing agent, and 40% citric acid solution are prepared according to the mass ratio of 100:15:10 to obtain the special adhesive for wood-based panels.

[0051] 2. Preparation of new environment-friendly formaldehyde-free straw-based panels:

[0052] (1) Straw treatment: the wheat straw with a moisture content of 16% is cut into 20-40mm grass sections by a cutting machine, then separated by gravity to remove impurities, and then sent to a hammer mill for hammer milling to be processed into qualified for...

Embodiment 3

[0062] 1. Preparation of special adhesive for formaldehyde-free straw wood-based panels:

[0063] Add ethyl acetoacetate to isocyanate, the mass ratio of isocyanate to ethyl acetoacetate is 6:5, then add cyclohexanone and react at 105°C for 2h; add diisopropylamine and react at 60°C for 1.5h, the ratio of isocyanate and diisopropylamine The mass ratio is 4:1, the product is naturally cooled, and the new curing agent is obtained by discharging.

[0064] The formaldehyde-free adhesive, new curing agent, and 40% tartaric acid solution are prepared in a mass ratio of 100:17:12 to obtain a special adhesive for wood-based panels.

[0065] 2. Preparation of new environment-friendly formaldehyde-free wheat straw-based panels:

[0066] (1) Straw treatment: the wheat straw with a moisture content of 20% is cut into 20-40mm grass sections by a cutting machine, and then separated by gravity to remove impurities and then sent to a hammer mill for hammer milling to be processed into qualif...

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Abstract

The invention discloses a special adhesive for a straw man-made board, and the special adhesive comprises an adhesive, a curing agent and a modifier in the ratio of 100:8-17:8-12. The special adhesive comprises two components of a main agent and the curing agent, breaks consensus in the industry that isocyanate glue must be used in production of straw man-made boards in the prior art, reduces production cost, and solves the key technology of the straw man-made board. The invention also discloses a production process of thestraw man-made board, and solves the deformation problems when the produced straw man-made boards in the prior art meet moisture. The curing speed can be effectively controlled in the board pressing process, the problems that a board blank is easy to loosen, and the board is easy to stick and easy to demould can be radically resolved, continuous production is realized, process operation is simple, and the production efficiency is greatly improved. The new environmentally friendly special adhesive for the straw man-made board is more environmentally friendly compared with MDI (methylene diphenyl diisocyanate) based adhesive, by use of a matched hot-pressing process, high value-added green sheet can be developed, and a new channel for straw comprehensive utilization and income growth of the peasants is opened up.

Description

technical field [0001] The invention relates to the field of wood-based panel manufacturing. More specifically, it relates to a special adhesive for straw-based panels and the preparation of straw-based panels. Background technique [0002] my country is a big agricultural country, producing nearly 700 million tons of crop straw every year. In the situation of shortage of wood raw materials, waste of crop straw resources and strong demand for wood-based panels, using crop straw instead of wood to make wood-based panels is a green and environmentally friendly alternative. Can save a lot of valuable timber resources. At the same time, it can reduce the loss of ecological benefits caused by deforestation. As an eco-friendly, new energy-saving new material and wood substitute, the new environmentally-friendly straw wood-based panel not only has excellent product performance, is non-toxic and harmless, but also can eliminate the environmental pollution caused by straw burning....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C09J11/06B27N3/00B27N3/08
Inventor 王凤奇杨辉李樾
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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