Method for preparing phenolic resin and phenolic resin foaming body

A technology of phenolic resin and foam, which is applied in the preparation of phenolic resin and the field of phenolic resin foam, which can solve the problems of low foam compressive strength, low thermal conductivity, high water absorption, etc., and achieve low water absorption, reduce pollution, and content Reduced effect

Active Publication Date: 2011-09-28
SHANDONG SHENGQUAN NEW MATERIALS CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The phenolic resin foam obtained by this method has low pollution, low density, low thermal conductivity and good dimensional stability, and can be used as building insulation material, but the compressive strength of the foam obtained by this method is low, only 1.2MPa ~1.8MPa; high water absorption, up to 7%

Method used

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  • Method for preparing phenolic resin and phenolic resin foaming body
  • Method for preparing phenolic resin and phenolic resin foaming body
  • Method for preparing phenolic resin and phenolic resin foaming body

Examples

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preparation example Construction

[0028] The invention provides a kind of preparation method of phenolic resin, comprises the following steps:

[0029] a) Mix molten phenol, alkali catalyst and alkali lignin, heat up to 170°C-300°C for reflux reaction, the alkali lignin is alkali lignin extracted from crops;

[0030] b) adding formaldehyde to the reaction liquid obtained in the step a), cooling to 60° C. to 90° C. and continuing the reflux reaction to obtain a phenolic resin.

[0031] The present invention uses phenol, formaldehyde and alkali lignin extracted from crops as raw materials to prepare phenolic resin. Since alkali lignin will affect the reaction between formaldehyde and phenol, the present invention first phenolizes alkali lignin, and then reacts with formaldehyde , to obtain a phenolic resin with better activity. In the present invention, the activity of described phenolic resin is characterized by active time, refers to according to ISO9771-1995: the mensuration of false adiabatic temperature ri...

Embodiment 1

[0079] After crushing the corn cobs, cooking them in sodium hydroxide solution, centrifuging the obtained cooking liquor and filtering it with a nanofiltration membrane to obtain a dope with an alkali lignin content of 60%.

Embodiment 2

[0081] To 100 g of molten phenol, add 10 g of a 50% sodium hydroxide aqueous solution and 50 g of the alkali lignin concentrate prepared in Example 1, distill at atmospheric pressure to 170° C., and reflux for 150 minutes, then cool the reaction system to 70° C. , adding 281g of formaldehyde solution with a mass concentration of 37% to continue the reaction for 90min, cooling to 50°C, adjusting the pH value of the reaction system to 7, and vacuum dehydrating the reaction mixture to a viscosity of 9000cp / 25°C to obtain a lignin phenolic resin.

[0082] The performance test of the lignin phenolic resin was carried out, and the results are shown in Table 1. Table 1 shows the performance parameters of the lignin phenolic resin provided by the examples and comparative examples of the present invention.

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Abstract

The invention provides a method for preparing phenolic resin, which comprises the following steps of: a) mixing molten phenol, a base catalyst and alkali lignin, and heating to the temperature of between 170 and 300DEG C for reflux reaction, wherein the alkali lignin is extracted from crops; and b) adding formaldehyde into reaction liquid obtained in the step a), and reducing temperature to 60-90DEG C for continuous reflux reaction to obtain the phenolic resin. The invention also provides a phenolic resin foaming body, which is obtained by foaming and curing a foamed phenolic resin mixture. Experiments prove that: the phenolic resin foaming body provided by the invention has the density of less than or equal to 50kg/m<3>, the compression strength of more than or equal to 0.18MPa, the tensile strength in the direction vertical to a panel of more than or equal to 0.11MPa, the water absorption of less than or equal to 3 percent, the coefficient of heat conductivity of less than or equal to 0.030W/(m.k), the dimensional stability of less than or equal to 1.5 percent and the combustion performance reaching grade B of GB8624-2006.

Description

technical field [0001] The invention belongs to the technical field of phenolic resin, and in particular relates to a preparation method of phenolic resin and a phenolic resin foam. Background technique [0002] Phenolic resin foam is obtained by foaming and curing foamed phenolic resin mixture. Compared with polyurethane foam, polystyrene foam, etc., phenolic resin foam has good heat insulation and flame retardancy. And fire resistance, as thermal insulation materials are widely used in construction, petrochemical, electrical, instrumentation and other industries, such as central air-conditioning ventilation ducts, external wall insulation, cold storage insulation boards, chemical oil insulation, solar insulation, etc. [0003] The main component in the foamed phenolic resin mixture is phenolic resin, which is generally synthesized by phenol and formaldehyde under the action of a catalyst, but due to incomplete reaction, there will be phenol and formaldehyde residues in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/28C08H6/00C08L61/14C08K3/32C08K3/22C08K3/26C08K5/521C08J9/14C08H7/00
Inventor 唐一林江成真李枝芳巩传海彭绵广于继刚左兴信郑广亮
Owner SHANDONG SHENGQUAN NEW MATERIALS CO LTD
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