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Formaldehyde-free medium-density bast-fiber straw particle board and manufacturing method thereof

A manufacturing method and medium-density technology, applied in the direction of manufacturing tools, flat products, adhesive types, etc., can solve the problems that the particle board indicators cannot fully meet the standards, have not been reasonably developed and utilized, and occupy large forest resources. The effect of human health, saving wood and increasing economic income

Inactive Publication Date: 2020-09-18
SHANGHAI COMPAK ENVIRONMENTAL PROTECTION EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]At present, the materials for making particle boards on the market are mainly from wood, which requires a large amount of forest resources
As the waste of non-food crops, hemp straw is a valuable renewable resource. For a long time, most of the hemp straw has been discarded or burned, and has not been rationally developed and utilized.
Moreover, the indicators of the particle board produced by the existing technology cannot fully meet the standards, and the adhesives containing formaldehyde are widely used, which is not conducive to human health.

Method used

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  • Formaldehyde-free medium-density bast-fiber straw particle board and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] 1. A method for manufacturing formaldehyde-free medium-density hemp straw particle board

[0053] figure 1 It is a flow chart of the manufacturing method of the embodiment of the present invention. Such as figure 1 As shown, the method for manufacturing a formaldehyde-free medium-density hemp straw particle board includes the following steps:

[0054] S1. Crushing: the hemp straw is crushed into two forms: coarse particles with a diameter less than or equal to 5.3 millimeters (mm) and fine particles with a diameter less than or equal to 2.1 millimeters (mm);

[0055] S2. Drying: keep the moisture content of the crushed hemp straw below 13%;

[0056] S3. Glue spraying and stirring: spray into diphenylmethane diisocyanate (MDI) respectively, stir coarse and fine particle, wherein, the content of diphenylmethane diisocyanate (MDI) is 1.8% of the dry weight of hemp class straw particle, with Spray particles with a diameter of less than 4.8 microns, and stir the coarse a...

Embodiment 2

[0065] 1. A method for manufacturing a formaldehyde-free medium-density hemp straw particle board comprises the following steps:

[0066] S1. Grinding: The hemp straw is crushed into two forms, coarse particles with a diameter of less than or equal to 5.0 millimeters (mm) and fine particles with a diameter of less than or equal to 2.0 millimeters (mm), of which the diameter is less than or equal to 2.1 millimeters ( mm) of fine particles accounted for 50% of the total particle weight;

[0067] S2. Drying: keep the moisture content of the crushed hemp straw below 12%;

[0068] S3. Glue spraying and stirring: Spray into formaldehyde-free adhesive, stir coarse and fine particle diphenylmethane diisocyanate (MDI) respectively, wherein, the content of diphenylmethane diisocyanate (MDI) is 2% of the dry weight of hemp straw particles 3.1%, sprayed in the form of particles with a diameter of less than 4.5 microns, stirring the coarse and fine particles separately;

[0069] S4. Layi...

Embodiment 3

[0077] 1. A method for manufacturing a formaldehyde-free medium-density hemp straw particle board comprises the following steps:

[0078] S1. Grinding: The hemp straw is crushed in two stages into two forms: coarse particles with a diameter less than or equal to 4.5 millimeters (mm) and fine particles with a diameter less than or equal to 1.8 millimeters (mm), of which the diameter is less than or equal to 2.1 millimeters ( mm) of fine particles accounted for 50% of the total particle weight;

[0079] S2. Drying: keep the moisture content of the crushed hemp straw below 1%;

[0080] S3. Glue spray stirring: Spray into formaldehyde-free diphenylmethane diisocyanate (MDI) respectively, stir coarse and fine particle diphenylmethane diisocyanate (MDI), wherein, diphenylmethane diisocyanate (MDI) The content is 3.9% of the dry weight of the hemp straw particles, which are sprayed in the form of particles with a diameter of less than 4 microns, and the coarse and fine particles are...

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Abstract

The invention discloses a formaldehyde-free medium-density bast-fiber straw particle board and a manufacturing method thereof. The manufacturing method comprises the steps of crushing, drying, glue spraying and stirring, raw material board blank laying, pre-pressing, hot-pressing and cutting to manufacture the formaldehyde-free medium-density bast-fiber straw particle board. The formaldehyde-freemedium-density bast-fiber straw particle board is completely made of bast-fiber straw and has a multi-layer structure of fine particles-coarse particles-fine particles. The manufacturing method has the beneficial effects that the particle board is completely made of bast-fiber straw, the bast-fiber straw is effectively utilized, wood is saved, the environment and natural resources are advantageously protected, and the economic income of farmers is also increased; and low-content diphenylmethane diisocyanate is adopted as an adhesive instead of the use of a formaldehyde-contained adhesive, themanufacturing cost of the particle board is lowered, the manufacturing method is safe and nonhazardous, and human health is facilitated.

Description

technical field [0001] The invention relates to the field of artificial boards, in particular to a formaldehyde-free medium-density hemp straw particle board and a manufacturing method thereof. Background technique [0002] Particle board is made by cutting various branch buds, small-diameter wood, fast-growing wood, wood chips, etc. into pieces of certain specifications, after drying, mixing with rubber, hardener, waterproofing agent, etc., and pressing it under a certain temperature and pressure. A wood-based panel. Widely used in the building materials industry, it can be used to make all kinds of furniture, door panels, wall panels, decorative panels, floors and packaging materials. [0003] At present, the production materials of particle boards in the market mainly come from wood, which needs to occupy a large amount of forest resources. As the waste of non-food crops, hemp straw is a valuable renewable resource. For a long time, most of hemp straw has been discarded...

Claims

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Application Information

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IPC IPC(8): B27N3/02B27N3/10B27N3/00B27N3/18B27N1/00C09J175/00
CPCB27N1/00B27N3/002B27N3/02B27N3/10B27N3/18C09J175/00
Inventor 王步宁宛俊生陈福新崔雄张玟籍
Owner SHANGHAI COMPAK ENVIRONMENTAL PROTECTION EQUIP CO LTD