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Oxidized cardanol modified phenolic resin and its preparation method and application

A technology for oxidizing cardanol and phenolic resin, applied in the field of phenolic foam, can solve the problems of unstable performance of phenolic foam, easy oxidation of carbon-carbon double bonds, difficult to use in large quantities, etc. Effect

Inactive Publication Date: 2017-03-01
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the side chain of cardanol has strong hydrophobicity, and the synthesis of phenolic resin is a water reaction system, formaldehyde and phenol are easy to dissolve into water, but cardanol is difficult to fully integrate into the resin synthesis system
[0005] In addition, the direct use of cardanol to replace part of phenol to synthesize phenolic resin has a large number of bubbles, which will cause a lot of inconvenience in industrial production and is difficult to use in large quantities.
There are many carbon-carbon double bonds on the side chain of cardanol, and the carbon-carbon double bonds are easily oxidized, which will cause unstable performance of phenolic foam

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for modifying cardanol and a method for preparing a toughened phenolic foam can be prepared by the following methods: 1. Mix cardanol, formic acid and 30wt.% hydrogen peroxide, heat to 60°C and react for 3h, then the temperature The mixture was cooled to room temperature and discharged, left to stand for stratification, washed three times with water, and freeze-dried for 24 hours to obtain oxidized cardanol. 2. In parts by mass, 95 parts of phenol, 5 parts of oxidized cardanol, 1.5 parts of sodium hydroxide and 10 parts of liquid formaldehyde of 37-40wt.% were mixed, and 48 parts of paraformaldehyde were added in an average of 5 times, and the temperature was raised to 85°C, hold the temperature for 1 hour, raise the temperature to 95°C, hold the temperature for 1 hour, cool down to 70°C, and discharge the material to obtain the oxidized cardanol modified phenolic resin. The resin solid content is 81% and the viscosity is 4200mPa.s. 3. Oxidized cardanol toughe...

Embodiment 2

[0022] A method for modifying cardanol and a method for preparing a toughened phenolic foam can be prepared by the following methods: 1. Mix cardanol, acetic acid and 30wt.% hydrogen peroxide, heat to 70°C and react for 3h, then the temperature The mixture was cooled to room temperature and discharged, left to stand for stratification, washed three times with water, and freeze-dried for 24 hours to obtain oxidized cardanol. 2. By mass parts, 90 parts of phenol, 10 parts of oxidized cardanol, 1.5 parts of sodium hydroxide and 10 parts of liquid formaldehyde of 37-40wt.% are mixed, and 46 parts of paraformaldehyde are added in 4 times on average, and the temperature is raised to 85°C, hold the temperature for 2 hours, raise the temperature to 95°C, hold the temperature for 1 hour, cool down to 70°C, and discharge the material to obtain the oxidized cardanol modified phenolic resin. The resin solid content is 80% and the viscosity is 4450mPa.s. 3. The oxidized cardanol toughened...

Embodiment 3

[0024] A method for modifying cardanol and a method for preparing toughened phenolic foam can be prepared by the following methods: 1. Mix cardanol, oxalic acid and 30wt.% hydrogen peroxide, heat to 80°C for reaction for 2 hours, and then adjust the temperature to The mixture was cooled to room temperature and discharged, left to stand for stratification, washed three times with water, and freeze-dried for 24 hours to obtain oxidized cardanol. 2. In parts by mass, 85 parts of phenol, 15 parts of oxidized cardanol, 2 parts of sodium hydroxide and 10 parts of liquid formaldehyde of 37-40wt.% were mixed, and 44 parts of paraformaldehyde were added on average in 4 times, and the temperature was raised to 85°C, hold the temperature for 1 hour, raise the temperature to 95°C, hold the temperature for 1.5 hours, cool down to 70°C, and discharge the material to obtain the oxidized cardanol modified phenolic resin. The resin solid content is 79% and the viscosity is 5600mPa.s. 3. The o...

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Abstract

Oxidized cardanol-modified phenolic resin and its preparation method and application are disclosed. Preparation steps are as follows: preparing oxidized cardanol: mixing cardanol, an acid catalyst and an oxidizing agent, heating to react, cooling to room temperature, discharging, standing for layering, removing an aqueous phase, washing off an oil phase with water, and freeze-drying to obtain oxidized cardanol; and mixing phenol, oxidized cardanol, a base catalyst and liquid formaldehyde, and adding paraformaldehyde by several times so as to prepare the oxidized cardanol-modified phenolic resin. The cardanol used in the invention is an abundant renewable resource, is cheaper and more environmentally friendly than phenol, and can be used to reduce production cost and raise economic benefit. Meta-position of cardanol carries a 15-C long straight carbon chain, and brittleness of phenolic foam can be improved by the introduction of an aliphatic flexible chain. By oxidation modification of cardanol, substitution amount of cardanol for phenol can be effectively increased, bubbles generated by synthesis of resin are obviously reduced, and toughness of phenolic foam is enhanced.

Description

technical field [0001] The present invention is in the technical field of phenolic foam, in particular to an oxidized cardanol-modified phenolic resin and a preparation method and application thereof. Background technique [0002] Phenolic foam has excellent fire resistance, low thermal conductivity, low density and low cost, so it can be widely used in building exterior wall insulation materials. In addition, the characteristics of heat resistance, self-extinguishing, low smoke, flame penetration resistance, no dripping during burning, and low smoke density of phenolic foam are incomparable advantages of other foams. However, the weakness of phenolic foam, which is easy to slag and pulverize, makes it difficult to popularize and use it on a large scale. Therefore, toughening and modifying phenolic foam to reduce the slag removal rate and pulverization degree of phenolic foam has always been a research hotspot in this field. [0003] Cardanol is extracted from cashew nut s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G8/28C08L61/14C08J9/14
Inventor 周永红梁兵川胡立红薄采颖周静
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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