Composite phenolic resin glue producing method

Abstract

The invention discloses a production method of composite phenolic resin glue. NaOH is used as a catalyst, and phenol and formaldehyde are subjected to polycondensation reaction under normal pressure. Ratio: The molar ratio of phenol to formaldehyde is 1:1.7~2.23, the weight ratio of sodium lignosulfonate SSL, NaOH, dilution water to phenol is 1:0.8~1.16; the reaction speed is controlled by polydimethylsiloxane , The reaction is carried out in four sections in a reactor. Its advantage is that there is no formaldehyde and phenol sewage treatment problem in the production process, and it will not pollute the environment. Only 160-180kg phenol is used to produce one ton of composite phenolic resin glue, and the production cost is reduced by 20%-30%. Adding it overcomes the shortcomings of high brittleness and high shrinkage of the general phenolic resin glue used as an adhesive to press the board. Experiments show that the strength of the board does not change after being boiled in boiling water for 4 hours, and the board is placed outdoors for four months without cracking.

Description

technical field [0001] The invention relates to a method for producing resin glue, more specifically, to a method for producing phenolic resin glue for wood-based panels. Background technique [0002] Phenolic resin glue has excellent bonding strength and water resistance, and has good durability under high temperature and high humidity environment. It is acid-resistant and chemical-resistant. It is a kind of wood-based panel adhesive with excellent performance. It is the first variety to realize industrial production. It is made of phenol and formaldehyde through polycondensation reaction. The thermosetting phenolic resin glue uses NaOH as a catalyst and is carried out in a reactor. The disadvantage is that the production cost is high. The raw material phenol For example, in 2003 the domestic market price was about 8,000 yuan per ton, and in 2004 it rose to 12,000 yuan per ton. Another reason is that the wood-based panels made of phenolic resin glu...

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Problems solved by technology

[0002] Phenolic resin glue has excellent bonding strength and water resistance, and has good durability under high temperature and high humidity environment. It is acid-resistant and chemical-resistant. It is a kind of wood-based panel adhesive with excellent performance. It is the first variety to realize industrial production. It is made of phenol and formaldehyde through polycondensation reaction. The thermosetting phenolic resin glue uses NaOH as a catalyst and is carried out in a reactor. The disadvantage is that the production cost is high. The raw material phenol For example, in 2003, the domestic market price was about 8,000 yuan per ton, but in 2004 it rose to 12,000 yuan per ton. Another reason is that the wood-based panels made of phenolic resin glue are brittle and have high shrinkage.

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