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Flame-retardant engineering plastics and preparation method thereof

A technology of engineering plastics and hyperbranched polymers, which is applied in the field of flame-retardant engineering plastics and its preparation, and can solve the problems of easy decomposition, popularization and application, easy combustion of engineering plastics, and unfavorable molding processing.

Active Publication Date: 2019-01-22
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, engineering plastics are flammable and easy to decompose at high temperatures, which limits their further application. Therefore, functional additives must be added to engineering plastics before molding to improve their flame retardancy, meet the use requirements, and reduce safety hazards.
Hyperbranched flame retardants have been used more and more widely in the field of polymer blending, but the structural characteristics of hyperbranched flame retardants themselves determine that their addition in the blending process of preparing engineering plastics cannot Higher than 10wt%, exceeding this amount will cause the viscosity of the blend to be too low, which is not conducive to molding processing
However, a lower amount of addition will lead to insufficient content of functional elements and poor flame retardancy

Method used

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  • Flame-retardant engineering plastics and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The preparation method of flame-retardant engineering plastics, the specific steps are as follows:

[0047] (1) Preparation of metal modified hyperbranched polymer;

[0048] (1.1) Use A 2 +B 3 Synthetic method to prepare a hyperbranched polymer with terminal carboxyl group: A 2 Is pyrazine-2,3-dicarboxylic acid; B 3 1,1,1-tris(hydroxymethyl)propane;

[0049] The prepared hyperbranched polymer with end groups containing carboxyl groups contains ester groups in its molecules, the number of carboxyl groups accounts for 25% of the total end groups, the degree of branching is 60%, and the weight average molecular weight is 2000 g / mol;

[0050] (1.2) Dissolve the hyperbranched polymer with carboxyl end groups in chloroform to obtain a concentration of 0.7 mol / L of the hyperbranched polymer solution with carboxyl end groups, and dissolve cobalt acetate in deionized water to obtain a concentration of 0.8 mol / L. L metal ion solution;

[0051] (1.3) Under the conditions of mechanical stir...

Embodiment 2

[0058] The preparation method of flame-retardant engineering plastics, the specific steps are as follows:

[0059] (1) Preparation of metal modified hyperbranched polymer;

[0060] (1.1) Use A 2 +B 3 Synthetic method to prepare a hyperbranched polymer with terminal carboxyl group: A 2 Is: 2-carboxyethylphenylphosphinic acid; B 3 Is: Tris (2-carboxyethyl) isocyanurate;

[0061] The prepared hyperbranched polymer with end groups containing carboxyl groups contains ester groups in its molecules, the number of carboxyl groups accounts for 27% of the total end groups, the degree of branching is 53%, and the weight average molecular weight is 43,000 g / mol;

[0062] (1.2) Dissolve the hyperbranched polymer with carboxyl group at the end group in acetone to obtain a solution of the hyperbranched polymer with carboxyl group at the end group concentration of 0.85mol / L, and dissolve nickel acetate in deionized water to obtain a concentration of 0.95mol / L. L metal ion solution;

[0063] (1.3) Unde...

Embodiment 3

[0070] The preparation method of flame-retardant engineering plastics, the specific steps are as follows:

[0071] (1) Preparation of metal modified hyperbranched polymer;

[0072] (1.1) Use A 2 +B 3 Synthetic method to prepare a hyperbranched polymer with terminal carboxyl group: A 2 As: 5-tert-butyl-1,3-benzenedicarboxylic acid; B 3 As: 2,4,5-trihydroxyphenylbutanone;

[0073] The prepared hyperbranched polymer with end groups containing carboxyl groups contains ester groups in the molecule, the number of carboxyl groups accounts for 25% of the total end groups, the degree of branching is 30%, and the weight average molecular weight is 15000g / mol;

[0074] (1.2) Dissolve the hyperbranched polymer with carboxyl end group in N,N-dimethylformamide to obtain a solution of the hyperbranched polymer with carboxyl end group at a concentration of 0.9 mol / L. Obtain a metal ion solution with a concentration of 1.0 mol / L in ionized water;

[0075] (1.3) Under the conditions of magnetic stirring...

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Abstract

The invention relates to flame-retardant engineering plastics and a preparation method thereof. After ABS resin and a flexibilizer are uniformly mixed, a metal-modified hyperbranched polymer is added,and the mixture is uniformly mixed and then melted and granulated to obtain the flame-retardant engineering plastics, wherein the metal-modified hyperbranched polymer is a network polymer formed by crosslinking a carboxyl-terminated hyperbranched polymer and metal ions; and the network polymer has insoluble and infusible properties, is insoluble in most organic solvents below 80 DEG C and is infusible within the range of room temperature to T which is greater than or equal to 370 DEG C. The cross-linking is achieved by connecting oxygen atoms on a double bond inside carboxyl-terminated hyperbranched polymer molecules and the metal ions through a coordinate bond and connecting acid radical ions at the end of the carboxyl-terminated hyperbranched polymer molecules and the metal ions throughan ionic bond. The metal-modified hyperbranched polymer is uniformly dispersed in the obtained engineering plastics. The preparation method is simple and feasible, and the prepared engineering plastics have good flame retardant performance and excellent molding processing performance.

Description

Technical field [0001] The invention belongs to the field of flame-retardant material preparation, and relates to a flame-retardant engineering plastic and a preparation method thereof. Background technique [0002] Engineering plastics can be used as engineering materials and plastics to replace metal manufacturing machine parts. It has excellent comprehensive properties such as high rigidity, small creep, high mechanical strength, good heat resistance and good electrical insulation, and it can be used in more demanding Long-term use in the chemical and physical environment. Compared with general plastics, engineering plastics can meet higher requirements in terms of mechanical properties, durability, corrosion resistance, heat resistance and weight, and are more convenient to process and can replace metal materials as structural materials. Since the successful development of polyoxymethylene and polycarbonate in the late 1950s, engineering plastics have developed rapidly. At ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L55/02C08L9/02C08L87/00C08G83/00
CPCC08G83/005C08G83/006C08G83/008C08L55/02C08L2201/02C08L2205/025C08L2205/03C08L2205/06C08L9/02C08L87/00
Inventor 孙宾敖翔朱美芳吉亚丽相恒学杨升元刘林
Owner DONGHUA UNIV
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