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Phenol-polyaldehyde prepolymer modified environment-friendly phenolic resin and preparation method thereof

A polyaldehyde prepolymer, phenolic resin technology, used in aldehyde/ketone condensation polymer adhesives, adhesive types, adhesives, etc. problems, to achieve the effect of reducing internal stress, reducing free phenol content, and low free aldehyde content

Active Publication Date: 2015-05-13
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Use phenol substitutes such as tannin, protein, lignin, etc., but the price of tannin and protein is high, and the low reactivity of lignin will seriously affect the performance of phenolic resin, so the existing phenol substitutes do not have industrialization prospects

Method used

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  • Phenol-polyaldehyde prepolymer modified environment-friendly phenolic resin and preparation method thereof
  • Phenol-polyaldehyde prepolymer modified environment-friendly phenolic resin and preparation method thereof
  • Phenol-polyaldehyde prepolymer modified environment-friendly phenolic resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Preparation of phenol-polyaldehyde prepolymer solution: In a 500ml four-neck bottle equipped with a reflux condensing device and a stirring device, add 47g of phenol and 1g of oxalic acid, raise the temperature to 105°C, and add 36g dropwise to a mass percentage of 40% Glyoxal solution was kept warm for 3 hours, 1g of sodium hydroxide was added, cooled and discharged to obtain a prepolymer solution.

[0025] Preparation of phenolic resin: Turn on the reflux condensing device and stirring device in another 500ml four-necked bottle, add 47g of phenol, 2g of sodium hydroxide, keep warm at 60°C for 20min, add 121g of formaldehyde solution with a mass fraction of 37%, keep warm After reacting for 30 minutes, add 84g of phenol-polyaldehyde prepolymer solution, continue to keep warm for 1h, heat up to 94°C and keep warm for 1.5h, add 5g of melamine, and wait until the viscosity reaches 500cp, then cool and discharge. The amount ratio is 1:1.5, and the prepolymer accounts for 3...

Embodiment 2

[0027] In the preparation method of the prepolymer of this embodiment, 0.5 g of acid catalyst oxalic acid is added, and the others are the same as in Example 1.

Embodiment 3

[0029] In the preparation method of the prepolymer of this embodiment, 3 g of acidic catalyst oxalic acid is added, and the others are the same as in Example 1.

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Abstract

The invention relates to a phenol-polyaldehyde prepolymer modified environment-friendly phenolic resin and a preparation method thereof. The phenolic resin in the method is prepared from phenol, formaldehyde and a phenol-polyaldehyde prepolymer through catalytic synthesis. The preparation method comprises the following steps: synthesizing the phenol-polyaldehyde prepolymer from a polyaldehyde monomer and phenol at a certain temperature in the presence of a catalyst; and introducing the phenol-polyaldehyde prepolymer into a phenolic resin system. The introduction of the phenol-polyaldehyde prepolymer increases the aldehyde equivalent in the system, and can effectively decrease the free phenol content in the resin; and the replacement of part of the formaldehyde with the polyaldehyde can effectively decrease the free formaldehyde content in the resin. Besides, the long-chain structure of the phenol-polyaldehyde prepolymer can enhance the flexibility of the phenolic resin and reduce the internal stress in the curing process, so that a pressed sheet has favorable adhesion strength and can meet the requirements for Class I waterproof plywood. The phenolic resin prepared by the invention has the advantages of low free phenol / free aldehyde content, simple process and the like, and is applicable to the field of production of functional environment-friendly artificial boards.

Description

technical field [0001] The invention relates to an environment-friendly phenolic resin modified by a phenol-polyaldehyde prepolymer and a preparation method thereof, belonging to the field of wood adhesives. Background technique [0002] With the development of China's economy, people's requirements for the quality of daily life are constantly improving, and forest resources are gradually decreasing. Therefore, the wood-based panel industry for the purpose of increasing the utilization rate of wood has developed rapidly, especially in the past ten years, the annual output of wood-based panels in my country has always maintained a growth rate of more than 10%. In 2011, my country's wood-based panel output exceeded 235 million m 3 , up to 2.8 m in 2012 3 about 100 million. Adapting to the booming development of the wood-based panel industry, the amount of glue used in my country's wood industry in 2012 exceeded 15 million tons, of which the amount of phenolic resin is secon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G8/28C09J161/14
Inventor 李效玉张晓鑫叶俊邱藤王海侨
Owner BEIJING UNIV OF CHEM TECH