Method for lowering adhesive consumption of melamine-modified urea resin wood adhesive

A wood adhesive, melamine technology, applied in the direction of adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the problems of large investment, rising cost of adhesives, difficult large-scale industrial application, etc. , to achieve the effect of ensuring physical and mechanical properties, simple method and cost saving

Inactive Publication Date: 2014-08-06
DEHUA TB NEW DECORATION MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of melamine has brought about an increase in the cost of the adhesive, and controlling the manufacturing cost of melamine-modified urea-formaldehyde resin is an important issue
Reducing the amount of sizing is the most direct way to reduce costs. In recent years, some special sizing equipment and methods to improve the performance of adhesives have been developed, but these aspects have the disadvantages of large investment and difficulty in large-scale industrial application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The melamine-modified urea-formaldehyde resin was prepared by alkali-acid-alkali process, the final molar ratio of formaldehyde to urea was 1.1, the content of melamine was 6% (by weight), and the viscosity was 68 mPa. s, add 0.3 times the water of the glue solution at the completion of the glue making stage, stir at high speed for 0.5 hours, adjust the glue, apply the glue to the surface of the shavings with a suitable moisture content, the glue amount is 9%, pave and enter the press Hot pressed into particleboard. 11mm thick and 750 kg / m density 3 The properties are: elastic modulus 2000MPa, static bending strength 16 MPa, internal bonding strength 0.50 MPa, formaldehyde emission 7.1mg / 100g. Compared with the performance of the particleboard prepared by undiluted glue, the amount of glue applied is reduced by 16%, the elastic modulus is increased by 20%, the static bending strength is 30%, and the internal bond strength is increased by 8%.

Embodiment 2

[0014] The melamine-modified urea-formaldehyde resin was prepared by alkali-acid-alkali process, the final molar ratio of formaldehyde to urea was 1.2, the content of melamine was 7% (by weight), and the viscosity was 76 mPa. s, add 0.8 times the water of the glue solution at the completion of the glue making stage, stir at high speed for 0.5 hours, adjust the glue, apply the glue to the surface of the shavings with a suitable moisture content, the glue amount is 10%, pave and enter the press Hot pressed into particleboard. 16mm thick and 750 kg / m density 3 The properties are: elastic modulus 1800MPa, static bending strength 14 MPa, internal bonding strength 0.40 MPa, formaldehyde emission 6.3 mg / 100g. Compared with the performance of particleboard prepared with undiluted glue, the amount of glue applied is reduced by 18%, the elastic modulus is increased by 5%, the static bending strength is 10%, and the internal bond strength is increased by 5%.

Embodiment 3

[0016] The melamine-modified urea-formaldehyde resin was prepared by alkali-acid-alkali process, the final molar ratio of formaldehyde and urea was 1.05, the content of melamine was 8% (by weight), and the viscosity was 85 mPa. s, add 0.5 times the water of the glue solution at the completion of the glue making stage, stir at high speed for 0.5 hours, adjust the glue, apply the glue to the surface of the shavings with a suitable moisture content, the glue amount is 9%, pave and enter the press Hot pressed into particleboard. 11mm thick and 750 kg / m density 3 The properties are: elastic modulus 1900 MPa, static bending strength 15 MPa, internal bond strength 0.43 MPa, formaldehyde emission 5.6 mg / 100g. Compared with the performance of the particleboard prepared by undiluted glue, the amount of glue applied was reduced by 14%, the elastic modulus was increased by 18%, the static bending strength was 15%, and the internal bonding strength was increased by 10%.

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Abstract

The invention belongs to the field of wood adhesives and particularly relates to a method for lowering adhesive consumption of melamine-modified urea resin wood adhesive. The method comprises steps of preparing adhesive, mixing adhesive, applying adhesive and thermally pressing. The method is characterized in that adhesive consumption of the melamine-modified urea resin wood adhesive is lowered by a diluting method, wherein the diluting method comprises the steps of adding water to dilute, and is used for gluing of a high-density fiber board and a shaving board. The melamine-modified urea resin wood adhesive contains over 5% by weight of melamine and is good in water solubility. The diluting process can be completed in an adhesive-preparing rear stage or an adhesive mixing stage, wherein water adding amount is 0.1-2 times the weight of the adhesive, and then high-speed stirring is carried out. The method disclosed by the invention has the advantages that the adhesive consumption is lowered by 9%-18%, formaldehyde emission is over E1, and physical and mechanical performances of the board are also ensured, and is simple and convenient to use.

Description

technical field [0001] The invention belongs to the field of wood adhesives, and in particular relates to a method for reducing the sizing amount of melamine-modified urea-formaldehyde resin wood adhesives, especially a dilution method for gluing medium and high-density fiberboards and particleboards. Background technique [0002] The free formaldehyde released from wood-based panels seriously pollutes the environment and endangers people's physical and mental health, which has become a hot issue of general concern in the society. For this reason, the Chinese government promulgated the mandatory standard GB 18580-2001 "Limits of formaldehyde release from wood-based panels and their products for interior decoration materials" on January 1, 2002. The traditional wood-based panel manufacturing process and urea-formaldehyde resin adhesive are difficult to meet the requirements of low formaldehyde emission. Faced with this situation, the addition of melamine-modified urea-formal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J161/30C09J11/00
Inventor 崔举庆韩书广冯小朴贾翀朱军韩勇黄河浪卢晓宁
Owner DEHUA TB NEW DECORATION MATERIAL CO LTD
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