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Imidazole carboxylic acid rare earth composite heat stabilizer for PVC and preparation method thereof

A composite stabilizer and rare earth composite technology, which is applied in the field of stabilizers, can solve the problems of poor thermal stability, poor durability, and high price, and achieve the effects of increased compatibility, low price, and small molecular weight

Inactive Publication Date: 2020-11-17
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, lead salt heat stabilizers have good long-term thermal stability and low price, but are toxic; organotin heat stabilizers have good thermal stability, but are expensive; lead soap and cadmium soap in metal soap heat stabilizers have good stability , but toxic, calcium soap and barium soap have poor initial thermal stability, zinc soap has good initial thermal stability, but poor persistence, prone to "zinc burning" phenomenon

Method used

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  • Imidazole carboxylic acid rare earth composite heat stabilizer for PVC and preparation method thereof
  • Imidazole carboxylic acid rare earth composite heat stabilizer for PVC and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0024] Preparation of lanthanum imidazole-4,5-dicarboxylate:

[0025] Put 50 g of imidazole-4,5-dicarboxylic acid in a beaker, add 800 mL of deionized water to dissolve, and prepare an imidazole-4,5-dicarboxylic acid solution with a mass concentration of 0.0625 g / ml. Measure 200mL of lanthanum chloride solution with a molar concentration of 1mol / L and put it in a beaker, place the beaker in a water bath, heat and stir to 60°C, add the imidazole-4,5-dicarboxylic acid solution drop by drop to the above system. After the dropwise addition, use a peristaltic pump to add 1,000 ml of aqueous sodium hydroxide solution with a molar concentration of 1 mol / L, and add in 60 minutes to make the pH of the solution = 5, then stir at constant temperature for 5 hours. Cool to room temperature, filter, wash, and dry at 70°C to obtain lanthanum imidazole-4,5-dicarboxylate.

[0026] Preparation of cerium imidazole-4,5-dicarboxylate:

[0027] Put 75g of imidazole-4,5-dicarboxylic acid in a bea...

Embodiment 1

[0031] Put 120g of lanthanum imidazole-4,5-dicarboxylate and 80g of calcium stearate into a high-speed mixer and mix for 2 minutes to obtain a composite stabilizer.

Embodiment 2

[0033] Put 80g of lanthanum imidazole-4,5-dicarboxylate and 120g of glycerol into a high-speed mixer and mix for 3 minutes to obtain a composite stabilizer.

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Abstract

The invention discloses an imidazole carboxylic acid rare earth composite heat stabilizer for PVC. The composite heat stabilizer is composed of a main stabilizer and an auxiliary stabilizer. The additives are polyols and stearates. The weight ratio of each component is: 1-10 parts of rare earth salt of small molecular weight imidazole carboxylate, 1-6 parts of polyol, and / or 1-7 parts of stearate. The invention solves the problem of low initial anti-coloring ability of a single rare earth stabilizer, and at the same time retains the excellent long-term thermal stability of the rare earth heat stabilizer, and the imidazole structure contained in the composite heat stabilizer can effectively inhibit the degradation of PVC. Low toxicity and environmental protection, in line with the development requirements of today's industry.

Description

technical field [0001] The invention relates to a stabilizer, in particular to an imidazole carboxylic acid rare earth composite heat stabilizer for PVC and a preparation method thereof. Background technique [0002] Polyvinyl chloride (PVC) is widely used for its good flame retardancy, chemical resistance, product transparency, electrical insulation and other properties, and is one of the five general-purpose resins in the world. However, there is a fatal defect in the processing of PVC, that is, the decomposition temperature of PVC is usually lower than its processing temperature. Under a certain temperature or light, PVC is easy to decompose and release HCl gas, and its thermal stability is poor. Therefore, PVC must be added with a stabilizer during processing. [0003] At present, the PVC heat stabilizers that have been commercialized in the world mainly include lead salt stabilizers, metal soap composite stabilizers, organotin stabilizers, rare earth stabilizers and au...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/06C08K5/3445C08K5/098C08K5/053
CPCC08K5/053C08K5/098C08K5/3445C08K2201/014C08L2201/08C08L27/06
Inventor 柳召刚李梅胡艳宏董昕冯佳萌冯福山郝伟王觅堂
Owner INNER MONGOLIA UNIV OF SCI & TECH
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