Cashew nut shell oil-modified phenolic resin and preparation method for cashew nut shell oil polyether polyol prepared from same

A technology of polyether polyol and cashew nut shell oil, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems such as unfavorable production and on-site construction, high toxicity, high viscosity of polyether polyol, etc., and achieve excellent mechanical properties, Moderate functionality, good alkali resistance

Active Publication Date: 2013-05-01
CARDOLITE CHEM ZHUHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned patents have successfully introduced cashew nut shell oil into the polyurethane coating system, there are still some deficiencies. For example, in US Patent 2005 / 0192423 A1, the raw material is a cardanol-depleted cashew nut shell oil mixture, Its viscosity at 25°C reaches 5000-20000cps, and the polyether polyol produced by it has a high viscosity, which is very unfavorable for actual production and on-site construction. In Japanese patent JP48029530, ethylene oxide or propylene oxide is introduced to process reaction, its toxicity is relatively high, and ethylene oxide is a gas at room temperature, which is not easy to control

Method used

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  • Cashew nut shell oil-modified phenolic resin and preparation method for cashew nut shell oil polyether polyol prepared from same

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A cashew nut shell liquid polyether polyol, its raw material is composed of the following components: 300g cashew nut shell liquid (1.0 mol), 18g paraformaldehyde (0.6 mol), 1.8g oxalic acid, 101.2 g (1.15 mol) of ethylene carbonate, 6 g triethylamine.

[0031] Its preparation method comprises the following steps:

[0032] 1) Add cashew nut shell oil and oxalic acid in sequence to the four-necked reaction flask, preheat to 60°C, then add paraformaldehyde in batches under stirring, while controlling the system temperature at 60-70°C, wait until the oxalic acid and paraformaldehyde are completely dissolve, get a solution;

[0033] 2) Heat the solution to 80°C for 5 h, then heat up to 80°C and vacuum dehydrate for 1.5 h (vacuum degree 35 mmHg) to obtain cashew nut shell oil modified phenolic resin, yield ≥ 95%, viscosity 505 cp25°C, pH =3.4;

[0034] 3) Add ethylene carbonate to the modified phenolic resin of cashew nut shell oil, mix well, then add triethylamine, mix w...

Embodiment 2

[0036] A cashew nut shell oil polyether polyol, its raw material is composed of the following components: 300g cashew nut shell oil (1.0 mol), 2.4g sulfuric acid aqueous solution (mass concentration 77%), 64.8g formaldehyde aqueous solution (mass concentration 37%, 0.8mol ), 132.6 g (1.3 mol) of propylene carbonate, and 8 g of triethylamine.

[0037] Its preparation method comprises the following steps:

[0038] 1) Add cashew nut shell oil and sulfuric acid aqueous solution in sequence to the four-necked reaction flask, preheat to 60°C, then add formaldehyde aqueous solution dropwise under stirring, while controlling the system temperature at 60-70°C, and wait until the formaldehyde is completely dissolved to obtain a solution;

[0039] 2) Heat the solution to 90°C for 6 h, then heat up to 70°C and vacuum dehydrate for 4 h (vacuum degree 10 mmHg), to obtain cashew nut shell oil modified phenolic resin, yield ≥ 95%, viscosity 715cp25°C, pH= 3.2;

[0040] 3) Add propylene carb...

Embodiment 3

[0042] A polyether polyol, the raw material of which consists of the following components: 300g of cashew nut shell liquid (1.0 mol), 1.3g of sulfuric acid aqueous solution (mass concentration 77%), 12g of paraformaldehyde (0.4mol), 142.8g of propylene carbonate ( 1.4mol), 10 g imidazole.

[0043] Its preparation method comprises the following steps:

[0044] 1) Add cashew nut shell oil and sulfuric acid aqueous solution in turn to the four-necked reaction flask, preheat to 60°C, then add paraformaldehyde in batches under stirring, while controlling the system temperature at 60-70°C, until the paraformaldehyde is completely dissolved , to get a solution;

[0045]2) Heat the solution to 100°C for 1 h, then heat up to 90°C for 1 h in vacuum dehydration (vacuum degree 40 mmHg), to obtain cashew nut shell oil modified phenolic resin, yield ≥ 95%, viscosity 351cp25°C, pH= 3.4;

[0046] 3) Add propylene carbonate to the modified phenolic resin of cashew nut shell oil, mix well, t...

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Abstract

The invention discloses cashew nut shell oil-modified phenolic resin and a preparation method for cashew nut shell oil polyether polyol prepared from the cashew nut shell oil-modified phenolic resin. The method for preparing the cashew nut shell oil-modified phenolic resin comprises the following steps: adding cashew nut shell oil and an acidic catalyst in a reactor; then adding a coupling agent by stirring to enable the coupling agent to be completely dissolved; and raising the temperature, reacting and dehydrating to obtain a product. The method for preparing the cashew nut shell oil polyether polyol comprises the following steps: adding a basic catalyst and an epoxy compound into the product; and rising the temperature, reacting, cooling and filtering to obtain the cashew nut shell oil polyether polyol. The polyether polyol prepared by the preparation method disclosed by the invention has the advantages of low viscosity, moderate functionality degree, no toxicity, regeneration and the like. The phenolic resin disclosed by the invention is used as intermediate resin. The cashew nut shell oil polyether polyol disclosed by the invention is applied to polyurethane coating and is used as hydroxyl-containing resin to be matched with an isocyanatec component to form a polyurethane coating system. The cashew nut shell oil polyether polyol has the characteristics of favorable corrosion resistance, in particular to alkali resistance, excellent mechanical performance and the like.

Description

technical field [0001] The invention relates to a cashew nut shell oil modified phenolic resin and a preparation method of the cashew nut shell oil polyether polyol prepared therefrom. Background technique [0002] Polyurethane coatings are widely used in the fields of national defense, infrastructure, chemical industry, anti-corrosion, electrical insulation and wood coatings due to their excellent adhesion, wear resistance, flexibility, decoration, and electrical properties. Increase, new products appear one after another, is a very promising coating varieties. However, traditional polyurethane coatings also have some deficiencies that affect their application range. Among them, traditional polyurethane coatings have poor corrosion resistance in a strong alkali environment, making them unable to be used in areas with high anti-corrosion requirements. Therefore, how to improve the corrosion resistance of polyurethane coatings, especially the alkali resistance, has become an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/24C08G65/28C09D175/08
Inventor 张凯黄绿
Owner CARDOLITE CHEM ZHUHAI
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