E0 class low imbibitions routing fibreboard and production method thereof

A production method and fiberboard technology, which are applied in the field of fiberboard manufacturing, can solve the problems that the formaldehyde emission of the milling fiberboard can not reach the E0 level standard and the water resistance is low, and can solve the problem of moisture absorption deformation, improve the water resistance, and expand the application site. Effect

Active Publication Date: 2017-08-11
DARE WOOD BASED PANEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to meet the requirements of the E0 level environmental protection standard and solve the problems that the formaldehyde emission of the existing engraved fiberboard does not meet the E0 level standard and the water resistance is low, the purpose of the present invention is to disclose an E0 level low-swelling engraved fiberboard and its production method , also discloses a preparation method of water-resistant melamine-modified urea-formaldehyde resin for producing E0 grade low-swelling milled fiberboard, including the research and development of water-resistant melamine-modified urea-formaldehyde resin adhesive, which reduces the amount of formaldehyde released from the milled fiberboard. E0 level environmental protection standard

Method used

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  • E0 class low imbibitions routing fibreboard and production method thereof
  • E0 class low imbibitions routing fibreboard and production method thereof

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Embodiment 1

[0029] 1. The preparation method of water-resistant melamine-modified urea-formaldehyde resin

[0030] The weight ratio of melamine to the moisture-proof adhesive is 15.0%, the molar ratio of formaldehyde to the sum of urea and melamine is controlled at 0.86-0.88, the formaldehyde is added at one time, the urea is fed in three batches, and the melamine is fed in three batches. The preparation process is as follows:

[0031] A. Put formaldehyde in the reaction kettle, add caustic soda solution to adjust the pH value to 4.5-5.0, and heat up to 35°C;

[0032] B. Add melamine for the first time, raise the temperature to 50°C immediately after adding, take a sample to observe whether the melamine is completely dissolved, and measure the pH value after the melamine is completely dissolved;

[0033] C. Add urea for the first time, control the molar ratio of formaldehyde to the sum of urea and melamine at 1.8-2.0, heat up to 80-88°C, take samples to check the pH value, and react at c...

Embodiment 2

[0044] 1. The preparation method of water-resistant melamine-modified urea-formaldehyde resin

[0045] The weight ratio of melamine to the moisture-proof adhesive is 13.0%, the molar ratio of formaldehyde to the sum of urea and melamine is controlled at 0.85-0.88, the formaldehyde is added at one time, the urea is fed in three batches, and the melamine is fed in three batches. The preparation process is as follows:

[0046] A. Put formaldehyde in the reaction kettle, add caustic soda solution to adjust the pH value to 5.0-5.5, and heat up to 40°C;

[0047] B. Add melamine for the first time, raise the temperature to 50°C immediately after adding, take a sample to observe whether the melamine is completely dissolved, and measure the pH value after the melamine is completely dissolved;

[0048] C. Add urea for the first time, control the molar ratio of formaldehyde to the sum of urea and melamine at 1.9-2.0, heat up to 80-88°C, take samples to check the pH value, and react at c...

Embodiment 3

[0057] 1. The preparation method of water-resistant melamine-modified urea-formaldehyde resin

[0058] The weight ratio of melamine to the moisture-proof adhesive is 12.0%, the molar ratio of formaldehyde to the sum of urea and melamine is controlled at 0.88-0.89, the formaldehyde is added at one time, the urea is fed in three batches, and the melamine is fed in three batches. The preparation process is as follows:

[0059] A. Put formaldehyde in the reaction kettle, add caustic soda solution to adjust the pH value to 5.0-5.5, and heat up to 35°C;

[0060] B. Add melamine for the first time, raise the temperature to 50°C immediately after adding, take a sample to observe whether the melamine is completely dissolved, and measure the pH value after the melamine is completely dissolved;

[0061] C. Add urea for the first time, control the molar ratio of formaldehyde to the sum of urea and melamine at 1.8-1.9, heat up to 80-88°C, take samples to check the pH value, and react at c...

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Abstract

The invention discloses an E0 class low imbibitions routing fibreboard and a production method thereof, further discloses a preparing method of water-resistant type melamine modified urea resin for producing the E0 class low imbibitions routing fibreboard, and belongs to the technical field of fibreboard manufacturing. The preparing method of the water-resistant type melamine modified urea resin includes the steps that an acid-acid-alkali-alkali synthetic process is adopted for synthesizing the water-resistant type melamine modified urea resin with the PH value being 8.5 to 9.0, the viscosity number being 16.0 S to 20.0 S and the solid content being 54.0% to 57.0% through four stages including an acid addition reaction, acid primary polycondensation, alkaline secondary polycondensation and alkaline aftertreatment. The preparing method of adhesive is improved and optimized, abrasive disc screening, hot milling and hot pressing production technological parameters of the fibreboard preparing are adjusted, the aim of reducing the formaldehyde emission of the routing fibreboard to the E0 class standard is achieved, and the problem that moisture absorption deformation is prone to occurrence in the routing machining or veneering machining (adopting the water-based type adhesive) and using process is solved.

Description

technical field [0001] The present invention relates to a fiberboard and a production method thereof, in particular to an E0 grade low-swelling engraved fiberboard and a production method thereof, and also relates to a preparation method of a water-resistant melamine-modified urea-formaldehyde resin for producing E0-grade low-swelling engraved fiberboard, belonging to Field of fibreboard manufacturing technology. Background technique [0002] Engraving and milling is a technical means of material processing. Engraving is hollow carving, and milling generally removes part of the material. The engraving and milling technology is applied to post-processing and manufacturing of wood products such as fiberboard for furniture and laminated floor substrates. Through hollow engraving, corner chamfering, engraving and milling notch and other engraving and milling processing, the products manufactured by this technology mainly include laminate flooring, Compared with the traditional ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27N3/00B27N3/04B27M1/08
Inventor 史国祥
Owner DARE WOOD BASED PANEL GRP
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