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Wood-plastic plate and preparation method thereof

A wood-plastic board and board technology, applied in the field of building materials, can solve the problems of high water expansion rate, poor screw holding force, and large glue content, etc., to achieve improved adhesion, improved use performance, and strong hydrophilicity Effect

Inactive Publication Date: 2015-09-16
甘肃圣大方舟马铃薯变性淀粉有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a wood-plastic board to solve the problems of poor water resistance, high water expansion rate, easy deformation, poor screw holding force and large glue content of existing straw boards.

Method used

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  • Wood-plastic plate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1—Preparation of straw three-layer composite board

[0033] A. Straw pretreatment

[0034] After the straw is cleaned and removed, cut it into 0.5cm long pieces; weigh NaOH and dissolve it in water to form a 1% alkali solution; add the straw to the alkali solution, and the mass ratio of the straw to the alkali solution is 1:10; heat to 100°C, soak for 1 hour, filter to obtain straw powder, wash with water until the water becomes neutral, dry, and set aside.

[0035] B. Preparation of single-layer straw composite board

[0036] 1. Put 80kg of carboxymethyl starch into the drum for pre-gelatinization and drying to obtain pre-gelatinized carboxymethyl starch, transfer it to a high-speed mixer, add glycerin accounting for 30% of the mass of carboxymethyl starch, add glycerin in three times, every ten Add once every minute; mix evenly at a temperature of 50°C, and let it stand for 6 hours to obtain glycerin plasticized carboxymethyl starch;

[0037] 2. Dry polylac...

Embodiment 2

[0043] Example 2—Preparation of a single-layer straw composite board

[0044] A. Straw pretreatment

[0045] After cleaning and removing impurities, the straw is cut into 1cm-long pieces, weighed and dissolved in water to form a 2% alkali solution, and the straw is added to the alkali solution with a mass ratio of the straw to the alkali solution of 1:10, heated to Soak at 90°C for 2 hours, filter to obtain straw coarse powder, wash with water until the water becomes neutral, dry, and set aside.

[0046] B. Preparation of single-layer straw composite board (composite board A)

[0047] 1. Take 120kg of carboxymethyl starch and put it into the drum for pre-gelatinization and drying to obtain pre-gelatinized carboxymethyl starch, transfer it to a high-speed mixer, add glycerin accounting for 35% of the mass of carboxymethyl starch, add glycerin in three times, every ten Minutes are added once. Mix well at 45°C and let stand for 5h. Obtain glycerol plasticized carboxymethyl st...

Embodiment 3

[0051] Example 3—Preparation of a single-layer straw composite board

[0052] A. Straw pretreatment

[0053] After the straw is cleaned and removed, cut it into 0.75cm long pieces, weigh NaOH and dissolve it in water to form a 3% alkali solution, add the straw to the alkali solution, the mass ratio of the straw to the alkali solution is 1:10, heat Soak at 80°C for 2 hours, filter to obtain straw coarse powder, wash with water until the water becomes neutral, dry, and set aside.

[0054] B. Preparation of single-layer straw composite board (composite board A)

[0055] 1. Take 100kg of carboxymethyl starch and place it into a roller for pregelatinization and drying to obtain pregelatinized carboxymethyl starch. Transfer it to a high-speed mixer and add glycerin accounting for 40% of the mass of carboxymethyl starch. Glycerin is added in three times, every ten Minutes are added once. Mix well at 40°C and let stand for 4h. Obtain glycerol plasticized carboxymethyl starch;

[...

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Abstract

The invention discloses a wood-plastic plate and a preparation method thereof to solve the problems that the existing straw plate is poor in water resistance, high in water expansion rate, easy to deform, poor in screw holding capability and high in gel content. The wood-plastic plate comprises the following raw materials in parts by weight: 70-90 parts of fine straw powder, 0.5-1 part of diphenylmethane diisocyanate and 10-30 parts of polylactic acid and carboxymethyl composite starch, wherein during the preparation of the polylactic acid and carboxymethyl composite starch, the added amount of the polylactic acid is 6-10 times of the mass of carboxymethyl starch. The preparation method of the wood-plastic plate comprises the steps of pretreating straws, preparing a single-layer straw composite plate, and preparing a three-layer straw composite plate. The wood-plastic plate disclosed by the invention has performance advantages of woods and plastics, and product materials are biodegradable materials and do not contain harmful substances including formaldehyde and the like to human bodies. The product is high in hardness, high in strength, difficult in deformation and strong in load bearing capacity.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a wood-plastic board. Background technique [0002] At present, in order to protect the ecological environment and the sustainable development of forestry, all countries in the world have formulated plans to limit log harvesting, resulting in a tense situation of timber supply in society. With the rapid development of my country's economy and the improvement of people's living standards, the demand for building panels has increased sharply. Therefore, it is necessary to broaden the source of raw materials, increase the output of wood-based panels, and reduce the amount of wood felling. The development trend of wood-based panels is rapidly changing from wood to various wood substitutes as raw materials. Using crop straw as the main raw material, the straw board produced has various excellent physical and mechanical properties, surface decoration performance and secon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L97/02C08L67/04C08L3/08C08K3/22C08K5/053
Inventor 田映良崔芸马青斌徐贵静
Owner 甘肃圣大方舟马铃薯变性淀粉有限公司
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