Water-soluble modified phenolic resin for bamboo impregnation and preparation method thereof

Abstract

The invention discloses water-soluble modified phenolic resin for bamboo impregnation and a preparation method thereof. The preparation comprises: adding phenol, a first batch of urea, a first batch of formaldehyde and industrial methanol into a reaction kettle, stirring and heating to 55-60 DEG C, carrying out a thermal reaction for 30-50 min, gradually adding a first batch of sodium hydroxide aqueous solution, continuing the reaction at 55-60 DEG C for 30min; adding a second batch of formaldehyde aqueous solution, heating to 80-85 DEG C, carrying out thermal reaction for a certain period oftime, gradually adding a second batch of sodium hydroxide aqueous solution, heating to 90-95 DEG C, adding a second batch of urea, maintaining 90-95 DEG C and reacting for 60 min, measuring the viscosity in a 10 * 100 format tube at 30 DEG C for 2 seconds and then adding a certain amount of water, stirring, cooling to 40 DEG C and discharging. The prepared modified phenolic resin adhesive is especially suitable for impregnating bamboo, and has low viscosity, good permeability and stable performance.

Description

technical field [0001] The invention relates to the technical fields of bamboo and wood processing and adhesives, in particular to a water-soluble modified phenolic resin impregnated with bamboo and a preparation method thereof. Background technique [0002] my country is a country with scarce forest resources. According to the statistics of the eighth forest resource inventory, the national forest area is 208 million hm 2 , the forest coverage rate is 21.63%, and the forest volume is 15.137 billion m 3 , the per capita forest volume is about 11m 3 , far below the world's 71.8m 3 Level. my country's bamboo resources are the most abundant in the world, with a total bamboo forest area of ​​6,006,300 hm 2 , is the main bamboo producing country in the world, and also the country with the largest bamboo industry. [0003] Bamboo is a natural composite material with excellent mechanical properties. It has high strength, good elasticity, high toughness, light weight and high ...

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Problems solved by technology

[0010] For the phenolic impregnating resins used above, in order to achieve the penetration effect, the phenolic resin is often diluted to a curing content of about 20%, so as to reduce the viscosity and improve the permeability, which often leads to the priority of small molecular weight resin and water in the impregnating resin Penetrating into the bamboo will increase the water content inside the bamboo. When drying, due to the fast external curing, moisture and small molecular weight resins will be sealed inside the bamboo, making it difficult to cure completely and affecting the hot-pressing performance of the bamboo.

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