Preparation method of methyl tin heat stabilizer

A technology of methyl tin heat and stabilizer, applied in tin organic compounds and other directions, can solve the problems of large dosage and high production cost, and achieve the effects of reducing formula cost, small addition amount and excellent thermal stabilization effect.

Active Publication Date: 2011-06-01
杭州天道实业有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention provides a kind of preparation method of methyl tin heat stabilizer aiming at the technical defects of heavy metal precipitation, high production cost and large dosage of existing rigid PVC technical

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  • Preparation method of methyl tin heat stabilizer
  • Preparation method of methyl tin heat stabilizer
  • Preparation method of methyl tin heat stabilizer

Examples

Experimental program
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Effect test

Example Embodiment

[0024] Example 1: Preparation of methyl tin chloride intermediate

[0025] Reaction formula:

[0026] 3Sn + 6CH3Cl =CH3SnCl3+(CH3)2SnCl2+(CH3)3SnCl

[0027] (CH3)3SnCl + SnCl4= CH3SnCl3+(CH3)2SnCl2

[0028] Total reaction formula:

[0029] Catalyst (CH3)4NCl

[0030] Sn + CH3Cl + SnCl4 → (CH3)xSnCly

[0031] The equipment used in this example: reaction kettle (with stirring system), distillation kettle (with stirring system), distillation absorption device, metering tank.

[0032] 1. Alkyl halogenation reaction: check the reaction kettle, transmission device, instrument, pipeline and absorption device to make it in normal state. Heat the reaction kettle to raise the temperature of the kettle to 120°C, turn on the vacuum system to make the kettle in a slightly negative pressure state, open the feeding port of the reaction kettle and add metal tin and tetramethylammonium chloride, close the feeding port, and pass in methyl chloride. Make the pressure in the kettle within the range of 0.3...

Example Embodiment

[0035] Example 2: Preparation of methyl tin chloride intermediate

[0036] The specific plan is the same as in Example 1, the difference is that the amount of each substance added is: metal tin (Sn) 80kg, methyl chloride (CH3Cl) 95 kg, tetramethylammonium chloride ((CH3)4NCl) 3.2 kg, tetrachloride Tin (SnCl4) 120 kg, water 300 kg. It is 7 hours for counter application. During the distillation process, the temperature of the kettle was controlled at 150-160°C, and the entire distillation process took 1.5 hours. 558.8 kg of an intermediate aqueous solution with a mass concentration of 46.31% was measured, and the yield was 96.62%. The aqueous solution is colorless and transparent.

Example Embodiment

[0037] Example 3: Preparation of methyl tin chloride intermediate

[0038] The specific scheme is the same as in Example 1, the difference is that the added amount of each substance is: metal tin (Sn) 95 kg, methyl chloride (CH3Cl) 102 kg, tetramethylammonium chloride ((CH3)4NCl) 3.2 kg, four Tin chloride (SnCl4) 128 kg. 300 kg of water. During the distillation process, the temperature of the kettle was controlled at 170-180°C, and the entire distillation process took 1 hour. 594.5 kg of intermediate aqueous solution with a mass concentration of 49.54% was obtained by measurement, with a yield of 97.0%, and the color of the aqueous solution was colorless and transparent.

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Abstract

The invention belongs to the technical field of organic chemistry and relates to a preparation method of a methyl tin heat stabilizer. The method comprises the following two steps: a) preparation of a methyl tin chloride intermediate: using tin, chloromethane and stannic chloride to perform alkane halogenation reaction so as to obtain the methyl tin chloride intermediate, and adding water for absorption so as to obtain a methyl tin chloride aqueous solution; and b) esterification-condensation reaction: adding MEO, sodium sulfide and ammonia water in the aqueous solution of methyl tin chloride to perform esterification-condensation reaction, and dewatering after fully reacting to obtain a methyl tin heat stabilizer product. The whole process of the preparation method is easy to control, and the cost is low; the methyl tin heat stabilizer product obtained by the method provided by the invention has an excellent heat stabilizing effect and can completely displace lead salt and cadmium heat stabilizers; and the product has the advantages of linear dosage control performance, low dosage and obviously lowered formula cost, and can be widely used in the manufacturing and processing fields of the PVC (polyvinyl chloride) plastic products.

Description

technical field [0001] The invention belongs to the technical field of organic chemistry and relates to a preparation method of a methyl tin heat stabilizer. Background technique [0002] Methyl tin heat stabilizer is a good heat stabilizer for plastic products, and it is widely used in the calendering, blow molding, extrusion molding and injection molding of polyvinyl chloride (PVC). Compared with heat stabilizers such as lead, cadmium salts and stearates, it has excellent heat stability, excellent transparency, good compatibility, non-toxic, less dosage, fluidity and weather resistance Good sex and other advantages. The product is also widely used in plastic doors and windows, water supply pipes, and decorative materials; and is approved by the German Federal Health Agency (BGA) and the US Food Administration (FDA) for use in PVC products for food and pharmaceutical packaging. The Chinese patent application with the application number 200410060772.0 provides a method for...

Claims

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Application Information

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IPC IPC(8): C07F7/22C08L27/06C08K5/58
Inventor 宋凤英倪继前朱文彪刘定杰王文英
Owner 杭州天道实业有限公司
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