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Eastern larch bark rapid pyrolysis oil modified phenolic resin adhesive

A technology for pyrolysis of oil and larch, applied in the direction of adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the problems of reducing reaction temperature, excessive average molecular weight, and reducing free formaldehyde content, etc. Achieve the effect of low formaldehyde emission and low cost

Inactive Publication Date: 2008-12-24
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The technical problem solved by the present invention: In order to overcome the problem that the average molecular weight of pyrolysis oil is too large, in the whole glue making process, the feeding method of adding pyrolysis oil in the middle and later stages is adopted to maintain the uniform growth of molecular weight in the whole system during the adhesive preparation process ; In order to control the intensity of the reaction and prevent gelation, the reaction temperature was appropriately reduced in the later stage of the preparation process; in order to reduce the free formaldehyde content, the molar ratio of formaldehyde to phenol was reduced, and formaldehyde was added in batches during the entire preparation process; in order to control the reaction process The pH value changes, and the method of adding NaOH in batches is used for resin synthesis

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific example

[0016] The invention provides a kind of preparation method of pyrolysis oil modified PF resin, specific example is as follows:

example 1

[0017] Example one: pyrolysis oil and phenol weight ratio are 40%, formaldehyde: phenol-pyrolysis oil mixture (mixture molecular weight is considered to be identical with phenol): the molar ratio of NaOH 1.8: 1: 0.4, add water and make system solid content reach 50%. Put the measured phenol, sodium hydroxide (4 / 5) and water into the reaction kettle at the same time, stir for 10 minutes, raise the internal temperature to 40-42°C, add a part of formaldehyde, raise the temperature to 80-85°C within 45min, keep warm After 20 minutes, heat the reactant to 90-95°C within 10 minutes, keep it in this state for 15 minutes, cool down to 75°C, add the remaining formaldehyde, the remaining sodium hydroxide and pyrolysis oil, heat to 78-80°C, and react When the viscosity is qualified (400-800cp), cool down to 40°C and discharge.

example 2

[0018] Example two: the weight ratio of pyrolysis oil and phenol is 40%, formaldehyde: phenol-pyrolysis oil mixture (mixture molecular weight is considered to be identical with phenol): the molar ratio of NaOH is 1.8: 1: 0.35, and water is added to make the system contain 50% solid. Put the measured phenol, sodium hydroxide (4 / 5) and water into the reaction kettle at the same time, stir for 10 minutes, raise the internal temperature to 40-42°C, add a part of formaldehyde, raise the temperature to 80-85°C within 45min, keep warm After 20 minutes, heat the reactant to 90-95°C within 10 minutes, keep it in this state for 15 minutes, cool down to 75°C, add the remaining formaldehyde, the remaining sodium hydroxide and pyrolysis oil, heat to 80-85°C, and react When the viscosity is qualified (400-800cp), cool down to 40°C and discharge.

[0019] indicators

Traditional PF resin

PF resin with 40% replacement rate of larch bark pyrolysis oil

Solid content

...

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PUM

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Abstract

The invention relates to a preparation method for a low-cost environmentally friendly (low formaldehyde release) larch bark pyrolyzed oil modified phenol-formaldehyde resin adhesive for manufacturing wood composite material. According to the invention, larch bark quickly pyrolyzed oil is used to replace 40 percent of the dosage of phenol, and the pyrolyzed oil modified phenol-formaldehyde resin adhesive is prepared by the means of adding pyrolyzed oil at the middle period to control a mild reaction temperature, and adding formaldehyde and sodium oxide batch by batch. Testing results show that: compared with pure phenol-formaldehyde resin, the modified phenol-formaldehyde resin with a pyrolyzed oil substitution rate of 40 percent can reduce the raw material cost by 33 percent and meet the production requirements of plywood and particle boards; the larch bark pyrolyzed oil modified phenol-formaldehyde resin adhesive reaches GB requirements and makes the formaldehyde release reach the environmental protection requirements of E1 grade and even reach the environmental protection standards of E0 if required; and if the particle boards adopt the pyrolyzed oil modified phenol-formaldehyde resin for glue application layer by layer, the thickness of a surface procuring layer can be effectively reduced.

Description

technical field [0001] The invention relates to a preparation method of a low-cost and environment-friendly pyrolysis oil-modified phenolic (PF) resin adhesive used for manufacturing wood composite materials, and belongs to the field of material science and technology. Background technique [0002] Adhesive, as an important raw material for wood-based panel production, is a key factor affecting the performance of wood-based panels. It is of great significance to improve the performance of wood-based panels and expand its application range. At present, "trialdehyde" glue is the main adhesive for wood, accounting for more than 80% of the adhesives used in the entire wood and wood-based panel industry. In "trialdehyde glue", PF resin is second only to urea-formaldehyde resin. The second largest wood adhesive. It has excellent bonding strength, good water resistance, heat resistance and chemical stability, and it is currently the main type of glue for outdoor wood-based panels....

Claims

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Application Information

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IPC IPC(8): C09J161/14C08G8/34
Inventor 常建民郑凯
Owner BEIJING FORESTRY UNIVERSITY
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