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Aqueous macromolecule-isocyanic ester stalk artificial board and preparation thereof

A water-based polymer and isocyanate technology, which is applied in the field of wood science and engineering, can solve the problems of loose blanks and slabs, poor slab pre-pressing performance, and high production costs, and achieve low manufacturing costs, good pre-pressing performance, and easy operation Effect

Active Publication Date: 2008-12-03
BEIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition to causing high production costs, this straw-based panel also has the following problems: ① sticking board problem
If the polymeric isocyanate adhesive is used directly, it will cause serious board sticking
②The problem of organic volatiles in the production process
③Poor slab preload
Defects such as loose blanks and sheet collapse during the transmission process

Method used

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  • Aqueous macromolecule-isocyanic ester stalk artificial board and preparation thereof
  • Aqueous macromolecule-isocyanic ester stalk artificial board and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0041] Example 1-3: Preparation of Water-based Polymer-isocyanate Adhesive for Water-Based Polymer-Isocyanate Straw Wood-based Panels of the Present Invention

[0042] The weight ratio of the raw materials used in each embodiment is shown in Table 1.

[0043] Table 1

[0044]

[0045]Its preparation method: (taking embodiment 1 as example, other embodiments are except raw material consumption difference, and preparation method is substantially identical with embodiment 1)

[0046] (1) Add 45kg of hydrochloric acid solution with a concentration of 0.5mol / L into the reactor with agitator and condenser, slowly add 15kg of cornstarch in the hydrochloric acid solution, stir vigorously to prepare cornstarch milk with a concentration of 35%, and heat up Keep warm at 55°C, add 0.1kg of ammonium persulfate to cornstarch milk, stir evenly, acidolysis and oxidation at 55°C, and pre-initiate for 30 minutes at the same time, adjust the pH value to 7 with 10% sodium hydroxide to obtain ...

Embodiment 4-6

[0049] Embodiment 4-6: Preparation of the water-based polymer-isocyanate straw-based panel of the present invention

[0050] The weight ratio of the raw materials used in each embodiment is shown in Table 2, and the water-based polymer-isocyanate glue is obtained from Example 1.

[0051] Table 2

[0052] Example

4

5

6

Raw material of straw

Rice straw with a moisture content of 8%

108.7kg

Wheat straw with a moisture content of 6%

106.4kg

Corn stover with 10% moisture content

111.2kg

Equivalent to dry straw

100kg

100kg

100kg

Water-based polymer-isocyanate glue

main ingredient

10kg

12kg

14.4kg

Water-based polymer-isocyanate glue

Hardener

1.0kg

1.2kg

1.44kg

Sizing method

Main agent mixing glue, curing agent spray glue

After the main agent and curing agent are mixed, the glue is mixed

Main agent mixing glue, cur...

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Abstract

The invention relates to a water-based macromolecule-isocyanate straw hard board and a preparation method thereof. Straws of rice, wheat, corn or other crops, a water-based macromolecule-isocyanate adhesive and a straw interface performance modifying agent are used as raw materials, and the straws are treated by section cutting, kneading and modification, adhesive application and heat pressing to produce the water-based macromolecule-isocyanate straw hard board. A mixture ratio of the absolute dry straws to the water-based macromolecule-isocyanate adhesive to the straw interface performance modifying agent by weight is 100 to 10-16 to 0.05-0.15. The straw hard board uses the water-based macromolecule-isocyanate adhesive to replace a pure isocyanate adhesive, radically improves the problems of toxic organic volatiles, poor prepressing performance, adhesion on boards, etc., remarkably reduces cost and really realizes green production, and the raw materials after the treatment of kneading and modification have good prepressing and molding performances and high one-off qualified rate. The water-based macromolecule-isocyanate straw hard board has the characteristics of unique design, long active period, excellent aging, water and heat resisting performances, simple operation, easy availability of equipment, no environmental pollution, easy implementation, etc., and produces huge entironmental, social and economical benefits after the water-based macromolecule-isocyanate straw hard board is popularized.

Description

technical field [0001] The invention relates to the improvement of straw-based panels, in particular to a water-based polymer-isocyanate straw-based panel and a preparation method thereof, belonging to the technical field of wood science and engineering in forestry engineering. Background technique [0002] When preparing straw-based panels with crop straws as raw materials, the interface activity is very poor due to the waxy and silicon-like substances on the surface of the straws, and effective gluing cannot be achieved with traditional amino resins. It is necessary to use isocyanate adhesive to glue straw fragments together. The price of isocyanate adhesive is usually 10-12 times that of urea-formaldehyde resin adhesive. As a result, the production cost and sales price of straw-based panels bonded with isocyanate adhesives have increased significantly. Calculated according to the current raw material prices, the cost of isocyanate adhesive used in 1 cubic meter of isocya...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27N3/02B27N1/00B27N1/02B27N3/08B27N3/18C09J175/00
Inventor 时君友王茜王垚涂怀刚
Owner BEIHUA UNIV
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