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Preparation method for modified urea-formaldehyde resin adhesive low-density rice husk-wood shaving composite plate

A technology of urea-formaldehyde resin glue and wood shavings, which is applied in the field of wood boards, can solve the problems of high density, high glue application, and low cost performance of board making, and achieve the effects of high production efficiency, high economic benefits, and easy processing

Inactive Publication Date: 2021-01-12
ZHEJIANG FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of low cost performance of the current rice husk board due to its high density and high sizing amount

Method used

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  • Preparation method for modified urea-formaldehyde resin adhesive low-density rice husk-wood shaving composite plate
  • Preparation method for modified urea-formaldehyde resin adhesive low-density rice husk-wood shaving composite plate
  • Preparation method for modified urea-formaldehyde resin adhesive low-density rice husk-wood shaving composite plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Wash the rice husk once with clean water to remove solid impurities and dust. After air-drying, use a universal grinder to grind and grind the crushed rice husk through a 15-mesh sieve. impurities such as powder and dust to obtain qualified raw materials;

[0027] (2) Weigh rice husk powder and wood shavings in step (1) and mix them in a mass ratio of 1:1, put them into a dryer at 103° C. and dry for 30 hours to reduce the water content to 3%;

[0028] (3) first mix urea-formaldehyde resin with mass concentration 25% NH 4 It is made by mixing Cl aqueous solution, urea-formaldehyde resin and curing agent NH 4 The mass ratio of Cl is 1:99, obtains urea-formaldehyde resin glue;

[0029] Put the mixture of rice husk and wood shavings into the glue mixer, turn on the power, open the vent valve, and pour the KH-550 coupling agent and urea-formaldehyde resin glue into the rubber tube at a uniform speed. The amount of the coupling agent added is 2.5% of the mixture mass. ...

Embodiment 2

[0036] (1) Wash the rice husk twice with clean water to remove solid impurities and dust. After air-drying, use a universal grinder to grind and grind the crushed rice husk through a 10-mesh sieve. impurities such as powder and dust to obtain qualified raw materials;

[0037] (2) Weigh rice husk powder and wood shavings in step (1) and mix them according to the mass ratio of 1:1.2, put them into a dryer at 100° C. and dry for 24 hours to reduce the water content to 5%;

[0038] (3) first mix urea-formaldehyde resin with mass concentration 25% NH 4 It is made by mixing Cl aqueous solution, urea-formaldehyde resin and curing agent NH 4 The mass ratio of Cl is 2:98, obtains urea-formaldehyde resin glue;

[0039] Put the mixture of rice husk and wood shavings into the glue mixer, turn on the power, open the vent valve, and pour the KH-550 coupling agent and urea-formaldehyde resin glue into the rubber hose at a uniform speed. The amount of the coupling agent added is 3% of the mas...

Embodiment 3

[0046] (1) Wash the rice husk 3 times with water to remove solid impurities and dust. After air-drying, use a universal grinder to grind and grind the crushed rice husk through a 18-mesh screen. The size of the wood shavings is larger than 25 mesh, and the small impurities such as powder and dust to obtain qualified raw materials;

[0047] (2) Weigh the rice husk powder and wood shavings in the step (1) and mix them in a mass ratio of 1:1.5, put them into a dryer at 105° C. and dry for 27 hours to reduce the water content to 4%.

[0048] (3) first mix urea-formaldehyde resin with mass concentration 25% NH 4 It is made by mixing Cl aqueous solution, urea-formaldehyde resin and curing agent NH 4 The mass ratio of Cl is 1:99, obtains urea-formaldehyde resin glue;

[0049] Put the mixture of rice husk and wood shavings into the glue mixer, turn on the power, open the vent valve, and pour the KH-550 coupling agent and urea-formaldehyde resin glue into the rubber tube at a uniform...

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Abstract

The invention belongs to the technical field of wood plates, and aims to solve the problem of low cost performance of a plate manufacturing due to a high density and a high sizing amount of an existing rice husk plate. The invention provides a method for manufacturing a low-density rice husk-wood shaving composite plate. The low-density rice husk-wood composite plate is prepared by taking a mixture of rice husks and wood shavings as raw materials, and taking urea-formaldehyde resin modified by a coupling agent as an adhesive. The rice husk-wood shaving plate can have physical properties meeting market requirements at a lower density, and therefore has higher economic benefits and is more beneficial to industrial production.

Description

technical field [0001] The invention belongs to the technical field of wood boards, and in particular relates to a modified urea-formaldehyde resin glue low-density rice husk-wood composite material and a preparation method thereof. Background technique [0002] my country is a large agricultural country, and its rice output ranks among the top in the world. At present, the rice output is still increasing. Rice husk is the main residue of rice processing, accounting for about 20% of the weight of rice, rich in sources, but not effectively utilized. With the promulgation of the national forest protection policy and the start of the natural forest protection project, the shortage of wood has become more and more serious, and the contradiction between the supply and demand of wood has become more and more prominent. The use of crop residues and rice husks to make particleboard has become a wood processing industry. Hot spots of concern. If rice husk can be used to make partic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27N3/02B27N3/08B27N1/02B27N1/00C08K5/544C08L61/24
CPCB27N3/02B27N3/08B27N1/0209B27N1/00C08K5/544
Inventor 郭明应毅涛于红卫吴荣晖
Owner ZHEJIANG FORESTRY UNIVERSITY
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