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A kind of preparation method of castor oil-based polyester used as pvc plasticizer

The technology of castor oil-based and plasticizer is applied in the field of preparation of castor-oil-based polyester, can solve problems such as single performance, small molecular weight, poor compatibility, etc., and achieves low cost, low energy consumption, simple and controllable reaction process Effect

Active Publication Date: 2015-08-26
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of preparation method of the castor oil base polyester that is used as PVC plasticizer, it has overcome the shortcomings such as traditional plasticizer molecular weight is little, performance is single, and PVC compatibility is poorer, has provided Castor oil-based polyester used as PVC plasticizer with strong thermal stability, good mechanical properties and high softness and preparation method thereof

Method used

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  • A kind of preparation method of castor oil-based polyester used as pvc plasticizer

Examples

Experimental program
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Embodiment 1

[0028] A kind of preparation method of castor oil base polyester as PVC plasticizer

[0029] (1) Preparation of castor oil-based dibasic acid: 81.61g of ricinoleic acid (RA, 0.25mol) with a concentration of 87%, 38.5g of hexahydrophthalic anhydride (HHPA, 0.25mol), Add 0.34 g of tetra-n-butyl titanate as a catalyst, control the temperature at 120° C., wait until the acid value no longer decreases, and cool to room temperature for later use.

[0030] (2) Preparation of primary castor oil-based polyester plasticizer: Weigh 37.67g of castor oil-based diacid (0.086mol) and 12.72g of diethylene glycol (DEG, 0.12mol) prepared above, Add 7.8g of cyclohexane and 0.95g of tetra-n-butyl titanate into the reactor, protect it with nitrogen, start stirring, slowly raise the temperature, and the maximum temperature does not exceed 210°C, measure the acid value every 1h, and react until the acid value Stop heating until lowered again, and cool to room temperature under the protection of nit...

Embodiment 2

[0037] A kind of preparation method of castor oil base polyester as PVC plasticizer

[0038] (1) Preparation of castor oil-based dibasic acid: Add 81.61g of ricinoleic acid (RA, 0.25mol) with a concentration of 87% and 24.5g of maleic anhydride (MA, 0.25mol) into a 250mL three-neck flask, add three 0.34 g of antimony oxide was used as the catalyst, and the temperature was controlled at 110°C. After the acid value no longer decreased, it was cooled to room temperature for later use.

[0039](2) Preparation of primary castor oil-based polyester plasticizer: Weigh 38.2g of castor oil-based diacid (0.1mol) prepared above, 18g of triethylene glycol (TEG, 0.12mol), 8.4 Add g cyclohexane and 0.75g antimony trioxide into the reactor, protect it with nitrogen gas, start stirring, slowly raise the temperature, and the maximum temperature does not exceed 210°C, measure the acid value every 1h, and react until the acid value no longer decreases , stop heating, and cool to room temperatur...

Embodiment 3

[0043] A kind of preparation method of castor oil base polyester as PVC plasticizer

[0044] (1) Preparation of castor oil-based dibasic acid: 81.61g of ricinoleic acid (RA, 0.25mol) and 38.5g of hexahydrophthalic anhydride (HHPA, 0.25mol) were added to a 250mL three-necked flask . Add 0.34 g of tetra-n-butyl titanate as a catalyst, control the temperature at 120° C., wait until the acid value no longer decreases, and cool to room temperature for later use.

[0045] (2) Preparation of primary product of castor oil-based polyester plasticizer: weigh 37.88g of castor oil-based diacid (0.086mol) and 10.8g of 1,4-butanediol (BDO, 0.12mol) prepared above , 8.7g of cyclohexane and 0.55g of tetra-n-butyl titanate were added to the reactor, protected by nitrogen gas, started to stir, slowly raised the temperature, and the maximum temperature did not exceed 210°C, measured the acid value every 1h, and reacted to the acid value Stop heating until it no longer decreases, and cool to roo...

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Abstract

The invention discloses a method for preparing caster oil-based polyester serving as a PVC (Polyvinyl Chloride) plasticizer, belonging to the technical field of chemical synthesis. The method comprises the following steps: preparing caster oil-based dicarboxylic acid by reacting a down-stream product, namely, ricinoleic acid of low-price bio-based raw caster oil, dihydric anhydride and dihydric alcohol serving as raw materials in two steps: preparing caster oil-based dicarboxylic acid by using ricinoleic acid and dihydric anhydride, and carrying out a polyesterification reaction on the caster oil-based dicarboxylic acid and the dihydric alcohol in the coexistence of a catalyst and a water-carrying agent; and distilling under reduced pressure to obtain the caster oil-based polyester PVC plasticizer. A PVC plastic test piece is prepared by treating the caster oil-based polyester PVC plasticizer, PVC resin and a thermal stabilizer according to a certain formula through a solvent film casting method. The test piece is soft, and is equivalent to a PVC plastic piece plasticized by dioctyl phthalate (DOP) in the transparency under the same condition. The raw material is caster oil-based, recyclable, low in price and independent of petroleum, a preparation process is simple, and three wastes are not produced. The product is non-toxic, environment-friendly, resistant to migration, and superior in plasticizing performance, and has a good application prospect.

Description

technical field [0001] The invention relates to a preparation method of castor oil-based polyester used as a PVC plasticizer, belonging to the technical field of chemical synthesis. Background technique [0002] A plasticizer is a substance added to polymer materials (usually resins, plastics or elastomers) to improve their processability, plasticity, and flexibility. At present, the plasticizers occupying the mainstream market are phthalates, such as dioctyl phthalate (DOP) and dibutyl phthalate (DBP), which are used in large amounts. However, studies have confirmed that such plasticizers have toxic effects on multiple systems of the body after entering the human body, especially harmful to women and children. The U.S. Environmental Protection Agency and the European Parliament have restricted the application of a variety of phthalate plasticizers in the field of environmental protection and hygiene, such as sensitive materials such as children's toys, medical devices, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/676C08G63/52C08G63/78C08L27/06C08L67/02
Inventor 蒋平平张彩芹
Owner JIANGNAN UNIV
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