Chipboard and production method thereof

A technology of particleboard and shavings, which is applied to other household appliances, household components, flat products, etc., can solve the problems of poor glue sizing uniformity, difficult glue mixing, high viscosity of formaldehyde-free glue, etc., to increase uniformity, improve efficiency, The effect of simplifying the process

Inactive Publication Date: 2018-06-15
WANHUA ECOBOARD INTEGRATED EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the formaldehyde-free glue used in formaldehyde-free particleboard is generally polyisocyanate, such as MDI glue. The viscosity of this formaldehyde-free glue is high, resulting in poor sizing uniformity, which will affect product quality; In order to improve the uniformity of sizing and reduce the friction between the mixing claw and the shavings, it is usually necessary to reduce the viscosity. However, because the traditional formaldehyde-free glue is usually non-water-soluble, it is often difficult to mix the glue evenly, which will also affect the sizing effect. glue quality

Method used

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  • Chipboard and production method thereof
  • Chipboard and production method thereof
  • Chipboard and production method thereof

Examples

Experimental program
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preparation example Construction

[0040] The flow chart of the particleboard production method according to the exemplary embodiment of the present disclosure is as follows: figure 2 shown. according to figure 2 , the preparation method of particle board comprises the following steps:

[0041]Preparation of shavings: prepare straw and wood into shavings, and divide them into surface shavings and core shavings according to the types of shavings, wherein the surface shavings are straw shavings, and the core shavings include wood shavings, and can further include Straw shavings. Surface shavings are fine straw shavings screened by 4.0-5.5mm sieves, which can increase compactness, improve surface strength and aesthetics when used on the surface; at the same time, wood shavings applied to the core layer can enhance the mechanical properties of the core layer.

[0042] Drying of shavings: Dry the shavings of the surface and the core layer through a dryer, so that the moisture content of the shavings of the surf...

Embodiment 1

[0056] Cut and crush crop straw and wood chips to make shavings, which are divided into surface shavings and core shavings according to the shape and type of shavings. Among them, the surface shavings are 100% straw shavings; the core shavings are 30% wood shavings, 30% straw shavings, 30% % Cotton stalk shavings and 10% Rapeseed stalk shavings. The surface layer and the core layer of shavings were dried to a moisture content of 9%-12% and 5%-7%, respectively, and then 10% by weight of water-dispersed polyisocyanate was applied for the experiment. Among them, the water-dispersed polyisocyanate is diluted with water to reduce the viscosity, and the sizing is carried out at room temperature. The surface and core layer particles after sizing are paved, and the particle board is obtained through hot pressing and further post-treatment. Among them, the particleboard density is controlled at 720kg / m 3 about.

[0057] 1. Steps

[0058] (1) Preparation of shavings

[0059] Use a ...

Embodiment 2

[0089] Carry out embodiment 2 in the same manner as Example 1, except that the water-dispersible polyisocyanate of 50% solid content is replaced by 7.5% solid content of 50% water-dispersible polyisocyanate, and the density is controlled at 750kg / m 3 about.

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Abstract

The invention provides a non-formaldehyde chipboard and a production method thereof. The non-formaldehyde chipboard comprises surface layers and a core layer clamped by the surface layers, wherein thesurface layers comprise straw shavings and non-formaldehyde adhesives, the core layer comprises wood shavings and non-formaldehyde adhesives, the non-formaldehyde adhesives are aqueous dispersion polyisocyanates, and the content of the aqueous dispersion polyisocyanates in the surface layers and the core layer accounts for 3-6% of the weight.

Description

technical field [0001] The invention relates to the field of formaldehyde-free particle boards, in particular to a particle board with water-dispersed polyisocyanate as an adhesive and a production method thereof. Background technique [0002] Particleboard is a kind of man-made board made of wood shavings, wood chips and crop straw, which realizes resource regeneration and has good environmental protection value. However, for a long time, the adhesives used in the production of particleboard are mainly urea-formaldehyde resin, phenolic resin and melamine-formaldehyde resin. Although these types of glue are cheap, they will release formaldehyde during use, which is harmful to human health. Therefore, the demand for formaldehyde-free particleboard is increasing, and its manufacturing process needs to be studied urgently. [0003] However, the formaldehyde-free glue used in formaldehyde-free particleboard is generally polyisocyanate, such as MDI glue. The viscosity of this fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27N3/02B27N3/10B27N3/18
CPCB27N3/02B27N3/10B27N3/18
Inventor 赵治美
Owner WANHUA ECOBOARD INTEGRATED EQUIP CO LTD
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