Preparation of heat stabilizer for PVC plastics

Abstract

A thermostabilizer used fir preparing polyvinyl chloride plastics is prepared through disproportionation reaction between tert-butyl tin and SnCl4, acting on cocoanut fatty acid to obtain dibutyltin bilaurate, and further mixing it with epoxy compound and benzene plasticizer. It can improve the high temp. resistance and transparency of polyvinyl chloride plastics with low cost and without pollution.

Description

technical field

[0001] The invention belongs to the field of fine organic chemical industry, and in particular relates to a preparation process of a high-efficiency heat stabilizer used for polyvinyl chloride plastic processing. Background technique

[0002] Chinese invention patent CN 108486IA discloses the preparation of a heat stabilizer for polyvinyl chloride plastic processing. The stabilizer is a synergistic compound composed of dibutyltin dilaurate, epoxy compound, phenyl ester, chelating agent and antioxidant. substance, its composition is

[0003] Dibutyltin dilaurate 35-70%

[0004] Epoxy compound 25-45%

[0005] Phenyl esters 5-20%

[0006] Chelating agent 0-3%

[0007] Antioxidant 0-3%.

[0008] The preparation method is as follows: (1) Under normal pressure and at a temperature of 50-90 DEG C, dibutyltin oxide is oxidized and synthesized with coconut oil for 1-2 hours to obtain crude dibutyltin dilaurate.

[0009] (2) The crude product is dehydrated under ...

Examples

Embodiment 1

[0058] In a 500ml flask equipped with a vacuum system and a stirrer, add 100 grams of tetrabutyltin, 60 grams of tin tetrachloride, plus some aluminum trichloride, tightly cover the bottle mouth, stir, open the vacuum system, and keep the pressure at Below 0.05Mpa, heat up to 130°C, keep warm, and carry out disproportionation reaction. After sufficient reaction, dibutyltin dichloride is obtained as a result of the reaction. Then add 2 times the molar ratio of coconut oleic acid and 2 times the molar ratio of sodium hydroxide to dibutyltin dichloride, tightly cover the mouth of the bottle, stir, and lower the temperature to 40°C, keep warm, and carry out the synthesis reaction. The pH value of the product is 4, after fully reacting, the reaction ends to obtain dibutyltin dicocotooleate, and through phase separation, the crude product of dibutyltin dicococoate is obtained. Then turn on the vacuum system, keep the vacuum degree below 0.09Mpa, gradually raise the liquid temperatur...

Embodiment 2

[0061]In a 500ml flask equipped with a vacuum system and a stirrer, add 100 grams of tetrabutyltin, 70 grams of tin tetrachloride, plus some aluminum trichloride, tightly cover the bottle mouth, stir, open the vacuum system, and keep the pressure at Below 0.05Mpa, heat up to 140°C, keep warm, and carry out disproportionation reaction. After sufficient reaction, dibutyltin dichloride is obtained as a result of the reaction. Then add 2 times the molar ratio of coconut oleic acid and 2 times the molar ratio of sodium hydroxide to dibutyltin dichloride, tightly cover the mouth of the bottle, stir, and reduce the temperature to 50°C, keep warm, and carry out the synthesis reaction. The pH value of the product is 6. After fully reacting, the reaction ends to obtain dibutyltin dicocotooleate, and through phase separation, the crude product of dibutyltin dicococoate is obtained. Then turn on the vacuum system again, keep the vacuum degree below 0.09Mpa, gradually raise the liquid temp...

Embodiment 3

[0064] In a 500ml flask equipped with a vacuum system and a stirrer, add 100 grams of tetrabutyltin, 75 grams of tin tetrachloride, plus some aluminum trichloride, tightly cover the bottle mouth, stir, open the vacuum system, and keep the pressure at Below 0.05Mpa, heat up to 145°C, keep warm, and carry out disproportionation reaction. After sufficient reaction, dibutyltin dichloride is obtained as a result of the reaction. Then add 2 times the molar ratio of coconut oleic acid and 2 times the molar ratio of sodium hydroxide to dibutyltin dichloride, tightly cover the mouth of the bottle, stir, and lower the temperature to 55°C, keep warm, and carry out the synthesis reaction. The pH value of the product is 5, after fully reacting, the reaction ends to obtain dibutyltin dicocotooleate, and through phase separation, the crude product of dibutyltin dicococoate is obtained. Then turn on the vacuum system again, keep the vacuum degree below 0.09Mpa, gradually raise the liquid temp...

technical field

[0001] The invention belongs to the field of fine organic chemical industry, and in particular relates to a preparation process of a high-efficiency heat stabilizer used for polyvinyl chloride plastic processing. Background technique

[0002] Chinese invention patent CN 108486IA discloses the preparation of a heat stabilizer for polyvinyl chloride plastic processing. The stabilizer is a synergistic compound composed of dibutyltin dilaurate, epoxy compound, phenyl ester, chelating agent and antioxidant. substance, its composition is

[0003] Dibutyltin dilaurate 35-70%

[0004] Epoxy compound 25-45%

[0005] Phenyl esters 5-20%

[0006] Chelating agent 0-3%

[0007] Antioxidant 0-3%.

[0008] The preparation method is as follows: (1) Under normal pressure and at a temperature of 50-90 DEG C, dibutyltin oxide is oxidized and synthesized with coconut oil for 1-2 hours to obtain crude dibutyltin dilaurate.

[0009] (2) The crude product is dehydrated under ...

Examples

Embodiment 1

[0058] In a 500ml flask equipped with a vacuum system and a stirrer, add 100 grams of tetrabutyltin, 60 grams of tin tetrachloride, plus some aluminum trichloride, tightly cover the bottle mouth, stir, open the vacuum system, and keep the pressure at Below 0.05Mpa, heat up to 130°C, keep warm, and carry out disproportionation reaction. After sufficient reaction, dibutyltin dichloride is obtained as a result of the reaction. Then add 2 times the molar ratio of coconut oleic acid and 2 times the molar ratio of sodium hydroxide to dibutyltin dichloride, tightly cover the mouth of the bottle, stir, and lower the temperature to 40°C, keep warm, and carry out the synthesis reaction. The pH value of the product is 4, after fully reacting, the reaction ends to obtain dibutyltin dicocotooleate, and through phase separation, the crude product of dibutyltin dicococoate is obtained. Then turn on the vacuum system, keep the vacuum degree below 0.09Mpa, gradually raise the liquid temperatur...

Embodiment 2

[0061]In a 500ml flask equipped with a vacuum system and a stirrer, add 100 grams of tetrabutyltin, 70 grams of tin tetrachloride, plus some aluminum trichloride, tightly cover the bottle mouth, stir, open the vacuum system, and keep the pressure at Below 0.05Mpa, heat up to 140°C, keep warm, and carry out disproportionation reaction. After sufficient reaction, dibutyltin dichloride is obtained as a result of the reaction. Then add 2 times the molar ratio of coconut oleic acid and 2 times the molar ratio of sodium hydroxide to dibutyltin dichloride, tightly cover the mouth of the bottle, stir, and reduce the temperature to 50°C, keep warm, and carry out the synthesis reaction. The pH value of the product is 6. After fully reacting, the reaction ends to obtain dibutyltin dicocotooleate, and through phase separation, the crude product of dibutyltin dicococoate is obtained. Then turn on the vacuum system again, keep the vacuum degree below 0.09Mpa, gradually raise the liquid temp...

Embodiment 3

[0064] In a 500ml flask equipped with a vacuum system and a stirrer, add 100 grams of tetrabutyltin, 75 grams of tin tetrachloride, plus some aluminum trichloride, tightly cover the bottle mouth, stir, open the vacuum system, and keep the pressure at Below 0.05Mpa, heat up to 145°C, keep warm, and carry out disproportionation reaction. After sufficient reaction, dibutyltin dichloride is obtained as a result of the reaction. Then add 2 times the molar ratio of coconut oleic acid and 2 times the molar ratio of sodium hydroxide to dibutyltin dichloride, tightly cover the mouth of the bottle, stir, and lower the temperature to 55°C, keep warm, and carry out the synthesis reaction. The pH value of the product is 5, after fully reacting, the reaction ends to obtain dibutyltin dicocotooleate, and through phase separation, the crude product of dibutyltin dicococoate is obtained. Then turn on the vacuum system again, keep the vacuum degree below 0.09Mpa, gradually raise the liquid temp...

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