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A method for preparing polyols for hydrolysis-resistant coatings by utilizing recovered alcohol and epoxidized soybean oil

A technology for epoxidized soybean oil and alcohol recovery, which is applied in the field of preparing polyols for hydrolysis-resistant coatings, can solve the problems of low purity of polyols, increased processing costs, and high processing costs, and achieves low production costs, improved heating efficiency, and environmental protection Effect of low-energy reuse

Active Publication Date: 2016-03-02
JIANGSU YINGTIAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low purity of the recovered polyols, its sales and application are also limited to a certain extent. However, fine purification will greatly increase the processing cost, which not only consumes a lot of energy, but also costs a lot.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1): Put 50Kg of recovered solar photovoltaic cutting fluid (hydroxyl value 500mgKOH / g), 12g of potassium hydroxide, etc. into the reactor at one time;

[0024] 2): Use high temperature and high pressure steam heating method to raise the temperature to 100°C;

[0025] 3): pass into N 2 As a protective gas and kept uninterrupted, 74.4kg of epoxidized soybean oil was slowly added dropwise, the pressure of the kettle was controlled at 0.2-0.3Mpa, and the temperature of the kettle was at 115°C. After the hydroxyl value of the product was qualified, the reaction was stopped to obtain a crude product;

[0026] 4): Transfer the crude product to the refining kettle, add phosphoric acid and refined preparations to produce solid precipitate, filter to obtain the refined product;

[0027] 5): Heat the refined product to 120°C, vacuumize to -0.10Mpa for vacuum dehydration, stop vacuuming after the moisture, pH value and other indicators are qualified, and cool down and unload. Tha...

Embodiment 2

[0029] 1): Put 68Kg of recovered solar photovoltaic cutting fluid (hydroxyl value 598mgKOH / g), 12g of potassium hydroxide, etc. into the reactor at one time;

[0030] 2): Use high temperature and high pressure steam heating method to raise the temperature to 100°C;

[0031] 3): pass into N 2 As a protective gas and kept uninterrupted, slowly add 60.42kg of epoxidized soybean oil dropwise, control the pressure of the kettle at 0.2-0.3Mpa, and the temperature of the kettle at 115°C, stop the reaction after the hydroxyl value of the product is qualified, and obtain the crude product;

[0032] 4): Transfer the crude product to the refining kettle, add phosphoric acid and refined preparations to produce solid precipitate, filter to obtain the refined product;

[0033] 5): Heat the refined product to 120°C, vacuumize to -0.10Mpa for vacuum dehydration, stop vacuuming after the moisture, pH value and other indicators are qualified, and cool down and unload. That is, a polyol for co...

Embodiment 3

[0035] 1): Put 80Kg of recovered solar photovoltaic cutting fluid (hydroxyl value 750mgKOH / g), 18.7g of potassium hydroxide, etc. into the reactor at one time;

[0036] 2): Use high temperature and high pressure steam heating method to raise the temperature to 100°C;

[0037] 3): pass into N 2 As a protective gas and kept uninterrupted, slowly add 107kg of epoxidized soybean oil dropwise, control the pressure of the kettle at 0.2-0.3Mpa, and the temperature of the kettle at 115°C, stop the reaction after the hydroxyl value of the product is qualified, and obtain the crude product;

[0038] 4): Transfer the crude product to the refining kettle, add phosphoric acid and refined preparations to produce solid precipitate, filter to obtain the refined product;

[0039] 5): Heat the refined product to 120°C, vacuumize to -0.10Mpa for vacuum dehydration, stop vacuuming after the moisture, pH value and other indicators are qualified, and cool down and unload. That is, a polyol for co...

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Abstract

The invention discloses a method for preparing a polyatomic alcohol for a hydrolysis-resistant coating by using recovered alcohol and epoxy soybean oil. The method comprises the following steps: 1) putting low-molecular recovered alcohol and a catalyst into a reaction kettle, and heating to 100-110 DEG C; 2) introducing N2 and dripping epoxy soybean oil, enabling the reaction temperature to be 110-120 DEG C, stopping the reaction after a hydroxyl value and a target hydroxyl value meet requirements, and obtaining a rough product; 3) transferring the rough product into a refining kettle, adding phosphoric acid and a refiner to enable the mixture to react with the catalyst in the step 1) to produce a solid precipitation, and filtering the precipitation to obtain a refined product; 4) heating the refined product to 120 DEG, vacuumizing to -0.10 Mpa to perform vacuum dehydration, and then reducing the temperature and discharging. According to the invention, a hydrophobic feature of vegetable oil is fully used, so that polar molecules such as water molecules are effectively prevented from entering intervals among molecules, damage to a molecular chain is avoided, and a good hydrolysis resistance is provided.

Description

technical field [0001] The invention relates to a method for preparing polyols for coatings, in particular to a method for preparing polyols for hydrolysis-resistant coatings by using recovered alcohol and epoxidized soybean oil. Background technique [0002] Polyether polyol is one of the important raw materials for synthesizing polyurethane resin. Polyurethane coatings synthesized from polyether polyol have good flexibility, hydrolysis resistance and low temperature resistance. [0003] At present, the main liquid component of solar photovoltaic cutting fluid is dihydric alcohol. With the continuous development of solar photovoltaic business and petrochemical industry, various polyol waste liquids will be continuously produced. Therefore, it is necessary to consider its follow-up treatment. Due to the low purity of recovered polyols, its sales and application are also limited to a certain extent. However, fine purification will greatly increase the processing cost, which n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G65/28C08G18/48C09D175/08
Inventor 杨水清罗伟蒋文俊陈玉龙王荣华
Owner JIANGSU YINGTIAN CHEM
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