Phenolic lignin-based modified foaming phenolic resin, foamed plastic and preparation method of phenolic lignin-based modified foaming phenolic resin

A technology of phenolic lignin and phenolic resin, applied in the field of energy-saving thermal insulation materials, can solve the problems affecting the thermal conductivity, oxygen index foaming uniformity, weather resistance and dimensional stability, industrial utilization and industrialization development of phenolic resin foaming materials. It also solves the problems of long distance and uneven foaming, and achieves the effect of promoting industrial application process, fast curing rate and low production cost.

Inactive Publication Date: 2012-09-12
HUANGSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the molecular weight distribution of the modified phenolic resin prepared by using untreated lignin is relatively wide, so that this type of phenolic resin has problems such as uneven foaming and incomplete curing, which affects the thermal conductivity of the phenolic resin foaming material. Performance indicators such as oxygen index, foaming uniformity, weather resistance and dimensional stability
Therefore, although the lignin-modified phenolic resin foaming material has begun to develop at home and abroad, it is still a long way from the real realization of industrial utilization and industrialization development. It is still in the laboratory stage, and no real successful application has been seen at home and abroad reports on actual production

Method used

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  • Phenolic lignin-based modified foaming phenolic resin, foamed plastic and preparation method of phenolic lignin-based modified foaming phenolic resin
  • Phenolic lignin-based modified foaming phenolic resin, foamed plastic and preparation method of phenolic lignin-based modified foaming phenolic resin
  • Phenolic lignin-based modified foaming phenolic resin, foamed plastic and preparation method of phenolic lignin-based modified foaming phenolic resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]Add 100.0g of phenol into the four-neck flask, rapidly raise the temperature to 70°C, add 15.0g of magnesium lignosulfonate, 2.0g of concentrated hydrochloric acid with a weight concentration of 36%, raise the temperature to 120°C, cool down, and cool the liquefied liquid to 50°C ℃, add 30.0g of sodium hydroxide solution with a weight concentration of 10%, 44.0g of paraformaldehyde, after 15 minutes of self-reaction, heat up to 70℃, keep warm for 90min, add 29.8g of formaldehyde, after 15min of self-reaction, heat up to 92℃ Insulation reaction, when the temperature reaches 90°C, take a sample every 5 minutes, and measure the viscosity by the foam-inversion method. When the foam-inverting time reaches 12.0s (25°C), add 10.0g of water, start to cool down, and adjust with 6mol / L hydrochloric acid at the same time When the pH reaches 6.0-7.0, when the temperature drops to 50°C, the material is discharged, and the lignin phenolization liquid modified expandable phenolic resin ...

Embodiment 2

[0035] Add 100.0g of phenol into the four-neck flask, rapidly raise the temperature to 70°C, add 40.0g of sodium lignosulfonate, 14.0g of concentrated hydrochloric acid with a weight concentration of 36%, and 10.0g of water, raise the temperature to 100°C, keep it warm for 20min, and then Add 30.0g of sodium lignosulfonate, keep warm for 20min, then add 30.0g of sodium lignosulfonate, heat up to 120°C, keep warm for 20min, cool the liquefied solution to 50°C, add 43.7g of 40% sodium hydroxide solution, Formaldehyde 189.8g, after 15 minutes of self-reaction, heat up to 80°C, keep warm for 75min, add 51.7g of formaldehyde, after 15 minutes of self-reaction, heat up to 95°C and keep warm for reaction, when the temperature reaches 90°C, take a sample every 5min, use reverse foam Viscosity was measured by the method. When the time of pouring foam reached 4.0s (25°C), the temperature began to drop, and at the same time, the pH was adjusted to 6.0-7.0 with solid oxalic acid. When the ...

Embodiment 3

[0037] Add 100.0g of phenol into the four-necked flask, rapidly raise the temperature to 70°C, add 35.0g of sodium lignosulfonate, 5.9g of concentrated hydrochloric acid with a weight concentration of 36%, raise the temperature to 120°C, keep it warm for 20min, and cool the liquefied liquid to 50°C ℃, add 30.3g of 30% sodium hydroxide solution, 139.7g of formaldehyde, after 15 minutes of self-reaction, heat up to 75℃, keep warm for 75min, add 46.6g of formaldehyde, after 15min of self-reaction, heat up to 90℃ and keep warm for reaction, when the temperature After reaching 90°C, take a sample every 5 minutes, and measure the viscosity with the reverse foam method. When the reverse foam time reaches 4.8s (25°C), start to cool down, and at the same time adjust the pH to 6.0-7.0 with solid oxalic acid. When the temperature drops to 60°C 69.7g of water was removed in vacuum, and the material was discharged to obtain the lignin phenolization liquid modified expandable phenolic resin....

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Abstract

The invention discloses a phenolic lignin-based modified foaming phenolic resin, foamed plastic and a preparation method of the phenolic lignin-based modified foaming phenolic resin. The foaming phenolic resin comprises phenol, lignin, an acid catalyst, aldehydes, a base catalyst and an acid neutralizer. Compared with the existing lignin-based phenolic resin and the foamed plastic of the lignin-based phenolic resin, the phenolic lignin-based modified foaming phenolic resin has the beneficial effects that a high-activity lignin phenolized liquid is directly adopted to replace phenol for preparing the foaming phenolic resin, so that the foaming phenolic resin has less free formaldehyde (with the content of less than or equal to 0.15%), and has the advantages of being lower in production cost, rapider in curing speed and the like; and compared with the traditional phenolic resin foamed plastic, the foamed plastic prepared by the phenolic lignin-based modified foaming phenolic resin has the advantages of lower coefficient of heat conductivity and higher compression strength.

Description

technical field [0001] The invention belongs to the field of energy-saving heat preservation materials, and in particular relates to a modified expandable phenolic resin based on phenolized lignin, a foamed plastic and a preparation method thereof. Background technique [0002] Compared with traditional foam-type insulation materials, the emerging phenolic resin foam has the characteristics of flame retardant, self-extinguishing, fire resistance, high temperature deformation resistance, low smoke, no dripping, and non-toxic when burning, and it also retains the characteristics of traditional foam plastics. Lightweight, easy to process, and convenient to construct, the type thermal insulation material is an energy-saving material with excellent performance in thermal insulation, fire prevention, light weight, and sound insulation. It has been widely used in air-conditioning pipes, building exterior walls, and industrial insulation. Phenolic resin foam is made by foaming expan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/28C08L61/14C08J9/14
Inventor 方红霞吴强林李长江周涛
Owner HUANGSHAN UNIV
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