Lignin-based phenolic foam material and preparation method thereof

A lignin-based and lignin-based technology, which is applied in the field of preparation of lignin-based phenolic insulation materials, can solve the problems of foam cavity and slow curing speed, and achieve cost reduction, fast curing speed and adjustable foaming ratio Effect

Inactive Publication Date: 2012-07-11
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The inventor's previous application number is 201010252819.9, which is called lignin resole phenolic resin for foaming and the lignin used together with phenol and formaldehyde in its preparation method The prepared lignin resole phenolic resin for foaming, but when it is used in the preparation of large volume foam materials in industrial production, the curing speed will be slow, and the foam body will appear voids

Method used

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  • Lignin-based phenolic foam material and preparation method thereof
  • Lignin-based phenolic foam material and preparation method thereof
  • Lignin-based phenolic foam material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] a Preparation of expandable lignin-based phenolic resin (30% lignin replacement)

[0034] After melting 400 parts of phenol, 111 parts of paraformaldehyde and 22 parts of distilled water were added into a four-necked flask equipped with a condenser, an electric stirrer and a thermometer, and the temperature of the entire reaction process remained at 80°C. In the first step, add 8 parts of Ba(OH) in batches 2 , the addition was completed within 60 minutes; in the second step, 137.8 parts of paraformaldehyde, 22 parts of distilled water, 171.44 parts of lignin and 15 parts of Ba(OH) were added in batches 2 , the addition was completed within 50 minutes; in the third step, 138.2 parts of paraformaldehyde and 7 parts of Ba(OH) were added in batches 2 , The addition was completed within 40 minutes; the fourth step was to add 20 parts of urea, and the addition was completed within 30 minutes.

[0035] b Preparation of copolymerized foam

[0036] Add 6.8 parts of phosphor...

Embodiment 2

[0038] Embodiment 2--A / B=0.1 /

[0039] a Preparation of expandable lignin-based phenolic resin

[0040] 140 parts of phenol melting and 36.5 parts of 37% formaldehyde solution were added into a four-necked flask equipped with a condenser, an electric stirrer and a thermometer, and the temperature was maintained at 80°C throughout the reaction process. In the first step, add 5.9 parts of Ba(OH) in batches 2 , the addition was completed within 60 minutes; in the second step, 41.94 parts of paraformaldehyde and 5.9 parts of Ba(OH) were added in batches 2 and 60 parts of lignin were added within 50 minutes; in the third step, 41.94 parts of paraformaldehyde and 2.8 parts of Ba(OH) were added in batches 2 , Added within 40min.

[0041] In the fourth step, the temperature is still maintained at 80° C., 6.15 parts of urea is added, and the reaction is carried out for 30 minutes to obtain a PUF resin with a lignin equivalent of 0.1.

[0042] b Preparation of copolymerized foam ...

Embodiment 3

[0044] Embodiment 3--C / D / E=0.2 / /

[0045] a preparation of high activity lignin phenolic resin

[0046] Add 140 parts of phenol after melting and 38 parts of 37% formaldehyde solution into a four-necked flask equipped with a condenser, an electric stirrer and a thermometer, and the temperature of the entire reaction process remains at 80°C. In the first step, add 5.9 parts of Ba(OH) in batches 2, the addition was completed within 60 minutes; in the second step, 43.66 parts of paraformaldehyde, 60 parts of lignin and 5.9 parts of Ba(OH) were added in batches 2 , the addition was completed within 50 minutes; in the third step, 43.66 parts of paraformaldehyde and 2.8 parts of Ba(OH) were added in batches 2 , added within 40min;

[0047] In the fourth step, the temperature is still maintained at 80°C, 6.15 parts of urea is added, and the reaction is carried out for 30 minutes to obtain PUF resins with different lignin equivalents.

[0048] b Preparation of copolymerized foam...

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Abstract

The invention discloses a lignin-based phenolic heat insulating material and a preparation method thereof. The preparation method comprises the following steps of: uniformly stirring expandable lignin basic phenolic resin with the conventional pH adjusting agent and a surfactant; adding a foaming agent and rapidly and uniformly stirring; adding a curing agent lastly; and uniformly stirring, and rapidly pouring into a specified enclosed container for foaming to the obtain lignin-based phenolic heat insulating material, wherein the used curing agent is a compound curing agent obtained by mixing toluenesulfonic acid and phosphoric acid in the mass ratio of 1.5:1. The foaming multiplying power of the lignin-based phenolic foam material is adjustable, the form hole fineness uniform density is 40-60 kg / m<3>, the compression strength is 0.07-0.45MPa, and the water absorbing rate is 7-15.5 percent.

Description

technical field [0001] The present invention is about the preparation method of lignin-based phenolic thermal insulation material, especially the preparation of high-activity enzymatic lignin modified resin and the application of urea, thiourea or dicyandiamide and melamine in the preparation process. Background technique [0002] Enzymatic lignin is lignin extracted from residues of energy fuels produced by microbial enzymatic hydrolysis of grains, straws and agricultural wastes. The process of enzymatically hydrolyzing straw and agricultural and forestry wastes is relatively mild, and enzymatically hydrolyzing lignin better retains the molecular structure of natural lignin, with low ash content and high reactivity. There are active groups such as aromatic groups, phenolic hydroxyl groups, alcoholic hydroxyl groups, methoxyl groups, and conjugated double bonds in the molecular structure of lignin, which can be used to synthesize resins with other compounds under certain co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/14C08L61/14C08K5/42C08K3/32C08G8/28
Inventor 许玉芝李玲张伟王春鹏储富祥
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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