Production method for phenol formaldehyde resin adhesive for bamboo recombined material

Abstract

The invention discloses a production method for a phenol formaldehyde resin adhesive for a bamboo recombined material, and relates to a production method for a phenol formaldehyde resin. The production process comprises: 1, adding phenol for the first time to a reactor, then starting a stirring apparatus, followed by adding caustic soda for the first time and process water, adding formaldehyde for the first time if the solution having a temperature less than 50 DEG C; 2, carrying out the reaction for 30-40 minutes, followed by holding for 30 minutes at the temperature of 90-95 DEG C when the temperature is raised to 90 DEG C; 3, cooling the reactor to the temperature of 70 DEG C through water after completing the holding, then adding the phenol for the second time and the caustic soda for the second time; 4, adding the formaldehyde for the second time when the temperature is less than 60 DEG C, then carrying out the reaction for 20-30 minutes, followed by sampling and detecting viscosity at the temperature of 95-97 DEG C when the temperature is raised to 95 DEG C; 5, immediately adding the formaldehyde for the third time when the viscosity accords with a process requirement, simultaneously cooling the reactor through introducing the water; 6, discharging the material when the temperature of the reactor is less than 45 DEG C. According to the present invention, the phenol amount of the new formula and the adhesive amount of the new formula are reduced so as to reduce production cost; due to more condensation reactions and polymerization reactions, the chemical reaction is completed more completely such that free phenol and free aldehyde are less.

Description

Technical field: [0001] The present invention relates to the production method of phenolic resin. Background technique: [0002] Bamboo wood-based panels have become an emerging industry in my country and play an important role in national economic construction and people's lives. Compared with wood, bamboo has high strength, high toughness, good wear resistance, and high density. There are many differences between bamboo and wood in structure, performance and production process. The urea-formaldehyde resin and melamine-modified urea-formaldehyde resin used in wood-based panels cannot meet the requirements of bamboo-based panel production, so most bamboo plywood factories use phenolic resin adhesives with higher prices. In order to facilitate production, phenolic resins with low molar ratios are mostly used, resulting in high production costs, high free phenols and free aldehydes, serious environmental pollution, poisoning workers' physical and mental health, and many occup...

AI Technical Summary

Problems solved by technology

The urea-formaldehyde resin and melamine-modified urea-formaldehyde resin used in wood-based panels cannot meet the requirements of bamboo-based panel production, so most bamboo plywood factories use higher-priced phenolic resin adhesives

In order to facilitate production, phenolic resins with low molar ratios are mostly used, resulting in high production costs, high free phenols and free aldehydes, serious environmental pollution, poisoning of workers' physical and mental health, and many occupational diseases among workers with long working periods.

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