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Light-color formaldehyde-free recombined bamboo sheet and preparation method thereof

A technology of recombining bamboo boards and light colors, which can be applied to flat products, other household appliances, household components, etc., can solve the problems of poor internal bonding strength and water resistance, achieve light color, solve formaldehyde pollution, and have superior mechanical properties.

Inactive Publication Date: 2016-09-28
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unsaturated polyester and bamboo strips or bamboo beams are directly mixed with hot-pressed boards. Although they have good static bending strength and elastic modulus, their internal bonding strength and water resistance are poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0029] The specific steps of the preparation method of the light-colored formaldehyde-free recombined bamboo board are as follows:

[0030] 1) Treat bamboo strips or bamboo bundles with a surface treatment agent;

[0031] 2) Dry the bamboo strips or bamboo bundles obtained in step 1) to a moisture content of 3-12%, and then spray modified unsaturated polyester resin or the bamboo strips or bamboo bundles in a modified solution with a mass concentration of 50-85%. Soak fully in unsaturated polyester resin solution, then add water resistant agent;

[0032] 3) The bamboo strips or bamboo bundles obtained in step 2) are assembled into blanks, and hot-pressed with a continuous hot press to obtain the light-colored formaldehyde-free recombined bamboo board. The hot-pressing temperature is 120-220 °C and the pressure is 2.5- 30MPa, hot pressing time 6-30min.

[0033] In order to make the content of the present invention easier to understand, the technical solutions of the present i...

Embodiment 1

[0035] 1) 100 parts by weight of bamboo strips are treated with 1 part by weight of isocyanate;

[0036] 2) Mix 100 parts by weight of unsaturated polyester resin, 1 part by weight of tert-butyl hydroperoxide, 1 part by weight of cobalt cyclooctanoate, 1 part by weight of silane coupling agent and 1 part by weight of titanate coupling agent to prepare the modified permanent unsaturated polyester resin; step 1) the obtained bamboo strips are dried to a moisture content of 5%, then sprayed into 8 parts by weight of modified unsaturated polyester resin, and then add 0.5 parts by weight of paraffin;

[0037] 3) The bamboo strips obtained in step 2) were assembled, and hot-pressed at 220 °C and 25 MPa for 6 minutes with a continuous hot press to obtain a light-colored formaldehyde-free recombined bamboo board with a thickness of 15 mm.

Embodiment 2

[0039] 1) Treat 100 parts by weight of bamboo bundles with 0.5 parts by weight of a surface treatment agent (prepared by mixing acetylacetone and maleic anhydride in a volume ratio of 3:2);

[0040] 2) Mix 100 parts by weight of unsaturated polyester resin, 0.5 parts by weight of dicumyl peroxide, 0.01 part by weight of cobalt cyclooctanoate, 0.2 parts by weight of silane coupling agent and 0.5 part by weight of titanate coupling agent to prepare a modified permanent unsaturated polyester resin; step 1) gained bamboo strips or bamboo bundles are dried to a moisture content of 12%, then sprayed into 11 parts by weight of modified unsaturated polyester resin, and then add 0.5 parts by weight of paraffin;

[0041] 3) The bamboo bundles obtained in step 2) were formed into blanks, and hot-pressed at 200 °C and 15 MPa for 15 minutes with a continuous hot press to obtain a light-colored formaldehyde-free recombined bamboo board with a thickness of 18 mm.

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Abstract

The invention discloses a light-color formaldehyde-free recombined bamboo sheet and a preparation method thereof. The recombined bamboo sheet is prepared from the following raw materials in parts by weight: 100 parts of bamboo strip or bamboo bundle, 4-20 parts of modified unsaturated polyester resin, 0.01-3 parts of surface treating agent and 0.5-2 parts of water proofing agent. The bamboo strip or bamboo bundle surface is treated, and the modified unsaturated polyester resin is used as an adhesive to prepare the light-color formaldehyde-free recombined bamboo sheet. The produced recombined bamboo sheet is free of formaldehyde, and has the advantages of favorable water resistance, high mechanical properties and favorable paint adhesiveness. The method can implement industrialization without modifying the existing recombined bamboo sheet production line, and can effectively solve the problems of abundant formaldehyde release, deep color, restricted application and the like in the recombined bamboo due to abundant use of the phenolic resin in the existing recombined bamboo sheet production process, thereby providing an effective way for wide application of recombined bamboo sheets.

Description

technical field [0001] The invention belongs to the technical field of artificial boards, and in particular relates to a light-colored formaldehyde-free recombined bamboo board and a preparation method thereof. Background technique [0002] Recombined bamboo products are made from bamboo strips or bamboo bundles, soaked in phenolic resin solution and then pressed under high temperature and high pressure. Recombinant bamboo products have attracted much attention for their excellent performance and low formaldehyde emission, and are products with independent intellectual property rights in my country. However, the recombined bamboo product has a deep color, which is dark brown, which limits the application field, and is often used in outdoor flooring building materials and furniture materials. In addition, in 2015, the Ministry of Environmental Protection has included the three major boards and the three major glues (urea-formaldehyde glue, phenolic glue and melamine-formalde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L97/02C08L67/06C08K5/14C08K5/098C08K5/18B27N3/00B27N3/08
CPCB27N3/002B27N3/08C08L97/02C08L2203/30C08L2205/03C08L67/06C08K5/14C08K5/098C08K5/18
Inventor 李燃庄清平杨文斌牛敏吴振增谢拥群
Owner FUJIAN AGRI & FORESTRY UNIV
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