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Method for improving high-temperature heat stabilization of thermoplastic polymers or composites thereof by inorganic metal phosphite

A thermoplastic polymer, stabilization method technology, applied in the field of polymer materials, can solve problems such as easy discoloration

Inactive Publication Date: 2018-12-25
JIANGSU LISIDE NEW MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention aims at the defect that the existing commercial organic hindered phenols and organic phosphate anti-oxidation systems are prone to discoloration under high temperature and high shear and multi-auxiliary systems, and provides a method to improve the thermoplastic polymer or its The method of high-temperature thermal stability of the compound, which enables the thermoplastic polymer or its compound to avoid problems such as cross-linking, decomposition, degradation, and discoloration under the combined action of high temperature and shear force, and maintains various properties of the material. performance

Method used

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  • Method for improving high-temperature heat stabilization of thermoplastic polymers or composites thereof by inorganic metal phosphite
  • Method for improving high-temperature heat stabilization of thermoplastic polymers or composites thereof by inorganic metal phosphite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Inorganic phosphite metal salts are used in thermoplastic polymers or their composites, and the thermal stability effect is investigated according to the following steps and test methods.

[0045] 1. Mixing of inorganic phosphite metal salt and thermoplastic polymer or its compound

[0046] Add the pre-weighed inorganic phosphite metal salt, thermoplastic polymer, and other components according to the ratio into the high-speed mixer, start high-speed stirring, and stir for 10 minutes to complete the mixing of each component and discharge.

[0047] 2. Extrusion and granulation of materials

[0048] Set the temperature of each zone of the twin-screw extruder at the predetermined temperature, and after the temperature stabilizes for 20 minutes, start the main engine and feeder to complete the extrusion and granulation of the material. The granulated material is sent into the silo through the air conveying system and dried.

[0049] 3. Application and testing of materials...

Embodiment 2

[0061] The implementation process is the same as in Example 1, except for adjusting the amount of aluminum phosphite, see Table 1 for other materials and proportioning, and see Table 1 for the obtained material results.

Embodiment 3

[0063] The implementation process is the same as in Example 1, except for adjusting the amount of aluminum phosphite, see Table 1 for other materials and proportioning, and see Table 1 for the obtained material results.

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Abstract

The invention discloses a method for improving high-temperature heat stabilization of thermoplastic polymers or composites thereof by inorganic metal phosphite. The method includes adding the inorganic metal phosphite into a raw material, wherein the inorganic metal phosphite is selected from at least one of aluminum phosphite, zinc phosphite, calcium phosphite and magnesium phosphite, and the adding amount of the inorganic metal phosphite accounts for 0.1-2% of the total weight of the thermoplastic polymers or the composites thereof. The method has the advantages that cross-linking, decomposition, degradation, discoloration and other problems of the thermoplastic polymers or the composites thereof are avoided under the joint action of the high temperature and the shearing force, and various properties of the materials are maintained.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a method for improving the high-temperature thermal stability of thermoplastic polymers or their composites by using inorganic phosphorous acid metal salts. Background technique [0002] The molding and processing of thermoplastic polymers need to go through a high temperature process, from a solid state at room temperature to a melt state, and the fluidity of the melt allows thermoplastic polymers to be formed arbitrarily. In the process of experiencing high temperature, polymer molecules may undergo changes such as crosslinking, oxidation, degradation (including polymer decomposition and hydrolysis), resulting in changes in processability, mechanical properties and material color. Therefore, in order to reduce the change of polymer during high temperature processing, different heat stabilizers or antioxidants are used according to different polymers. The main function...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/06C08K13/04C08K3/32C08K5/5313C08K7/14C08K5/521
CPCC08K13/04C08K3/32C08K5/521C08K5/5313C08K7/14C08L2201/08C08L2201/22C08L77/06
Inventor 雷华李金忠杨建伟
Owner JIANGSU LISIDE NEW MATERIAL
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