Preparation method and application method of thermosetting water-soluble phenolic resin nano-powder adhesive

A technology of water-soluble phenolic resin and nano-powder, which is applied in applications, adhesives, and other household appliances. It can solve the problems of dry powder grinding and re-dissolving difficulties, changes in physical and chemical properties, and impact on bonding performance. It saves evaporation time, The effect of reducing drying energy consumption and improving bonding strength

Active Publication Date: 2018-10-16
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This drying method will cause the liquid adhesive to continue to polycondense during the heating process, resulting in an increase in molecular weight and changes in physical and che

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Concentrate the thermosetting water-soluble phenolic resin adhesive under a vacuum of 0.05 MPa. During the concentration, the temperature of the adhesive is controlled at 20°C and concentrated to a solid content of 50%. The concentrate is pre-frozen at -40°C until completely frozen; the sublimation drying section, the vacuum degree is 0.01mbar, and the freeze-drying temperature is -40°C; the analytical drying section, the vacuum degree is 0.001mbar, and the freeze-drying temperature is -80°C to obtain dry powder. The dry powder is ground at 190° C. by a nano ball mill to a sieve value of 400 nm to obtain a nano powder. The nano-powder is applied to the wood fiber by air blowing, the nano-powder and the wood fiber are mixed evenly by mechanical stirring, the wood fiber is dried to a relative moisture content of 30%, and the application amount of the nano-powder is calculated as 5% of the dry fiber mass . After the sizing fiber is paved, it enters the hot press for pre-p...

Embodiment 2

[0035]Concentrate the thermosetting water-soluble phenolic resin adhesive under a vacuum of 0.06 MPa. During the concentration, the temperature of the adhesive is controlled at 30°C and concentrated to a solid content of 60%. The concentrate is pre-frozen at -45°C until it is completely frozen; the sublimation drying section, the vacuum degree is 0.02mbar, and the freeze-drying temperature is -45°C; the analytical drying section, the vacuum degree is 0.002mbar, and the freeze-drying temperature is -70°C to obtain dry powder. The dry powder is ground by a nano ball mill at 220° C. until the sieve value is 500 nm to obtain a nano powder. The nano-powder is applied to the wood fiber by air blowing, the nano-powder and the wood fiber are mixed evenly by mechanical stirring, and the wood fiber is dried to a relative moisture content of 100%. . After the sizing fiber is paved, it enters the hot press for pre-pressing, and the hot press heats up to 200°C for heat preservation. The ...

Embodiment 3

[0039] Concentrate the thermosetting water-soluble phenolic resin adhesive under a vacuum of 0.07 MPa. During concentration, the temperature of the adhesive is controlled at 40°C and concentrated to a solid content of 70%. The concentrate is pre-frozen at -50°C until it is completely frozen; the sublimation drying section, the vacuum degree is 0.03mbar, and the freeze-drying temperature is -50°C; the analytical drying section, the vacuum degree is 0.003mbar, and the freeze-drying temperature is -60°C to obtain dry powder. The dry powder is ground by a nano ball mill at 250° C. until the sieve value is 600 nm to obtain a nano powder. The nano-powder is applied in the wood shavings by air blowing, the nano-powder and the wood shavings are mixed evenly by mechanical stirring, and the wood shavings are dried to a relative moisture content of 40%. . After the sizing shavings are paved, they enter the hot press for pre-pressing, and the hot press heats up to 210°C for heat preserva...

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Abstract

The invention provides a preparation method of a thermosetting water-soluble phenolic resin nano-powder adhesive. The preparation method comprises the following steps that 1, carrying out vacuum concentration on the thermosetting water-soluble phenolic resin adhesive; 2, carrying out vacuum freeze drying on the concentrated thermosetting water-soluble phenolic resin adhesive; and 3, carrying out grinding and screening after vacuum freeze drying. The nano-powder adhesive prepared by the preparation method is applied to a high-moisture-content artificial board base material in a dry-process sizing mode, an artificial board is produced by a respiration type hot pre-pressing process so that the drying energy consumption of the artificial board base material can be reduced, the curing speed ofthe adhesive is increased, the bonding strength of the artificial board is improved, and the content of free phenol and the release amount of formaldehyde are reduced.

Description

technical field [0001] The invention relates to a preparation method and an application method of a thermosetting water-soluble phenolic resin nano-powder adhesive, belonging to the field of wood-based panel manufacturing. Background technique [0002] Phenolic resin adhesive has excellent characteristics such as high bonding strength, strong boiling water resistance, and good thermal stability. However, water-soluble phenolic resin adhesive has shortcomings such as short storage period, slow curing speed, free phenol and formaldehyde release, and low moisture content requirements for bonding substrates, which hinder its application in the wood-based panel industry. application. [0003] The general spray drying is a kind of suspended particle processing technology. It is a process of atomizing the feed liquid into fine droplets by using high pressure, and rapidly evaporating the solvent in the hot drying medium to form a dry powder product. This drying method will cause...

Claims

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Application Information

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IPC IPC(8): B27N1/02B27N3/10B27N3/12B27G11/00B27D1/08C09J161/06
CPCB27D1/08B27G11/00B27N1/0209B27N3/10B27N3/12C09J161/06
Inventor 韩书广甘露崔举庆徐朝阳徐德良丁涛王华
Owner NANJING FORESTRY UNIV
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