Preparation method of graphite-base flame-retardant char forming agent

A char-forming agent and graphite-based technology, which is applied in the field of preparation of flame-retardant char-forming agents, can solve the problems of difficult dispersion, poor compatibility of flame-retardant expandable graphite, etc., achieve good compatibility, and improve synergistic flame retardant. Ability, Ease of Recycling and Utilization

Active Publication Date: 2013-07-24
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problem of poor compatibility and difficulty in dispersing flame-retardant expandable graphite in polystyrene matrix and its polymer solution, and provides a preparation method of carbon-forming agent for graphite-based flame-retardant

Method used

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  • Preparation method of graphite-base flame-retardant char forming agent
  • Preparation method of graphite-base flame-retardant char forming agent
  • Preparation method of graphite-base flame-retardant char forming agent

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specific Embodiment approach 1

[0015] Specific embodiment one: present embodiment a kind of preparation method of carbon-forming agent for graphite-based flame retardant, specifically prepare according to the following steps:

[0016] 1. Disperse natural graphite powder in perchloric acid / nitric acid mixed solution, and then carry out oxidation and pre-expansion treatment at a temperature of 50°C to obtain expandable graphite with carboxyl groups on the surface, in which natural graphite powder and perchloric acid The mass ratio of nitric acid mixture is 20:500~2000;

[0017] 2. Mix the expandable graphite obtained in Step 1 with thionyl chloride evenly, and then keep it at a temperature of 20°C to 120°C for 1min to 360min, and then dry it in a vacuum to obtain expandable graphite acid chloride, in which Step 1 obtains The mass ratio of expandable graphite to thionyl chloride is 1~10:100;

[0018] 3. Add the polyhydroxy fullerene chloroform solution with a mass concentration of 0.05% to 5.0% to the chlorof...

specific Embodiment approach 2

[0021] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the volume ratio of perchloric acid and nitric acid in the perchloric acid / nitric acid mixed solution in step one is 30:70. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0022] Specific embodiment three: the difference between this embodiment and specific embodiment one is: the mass ratio of natural graphite powder and perchloric acid / nitric acid mixed solution in step one is 20:550~1900. Others are the same as in the first embodiment.

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Abstract

The invention relates to a preparation method of a flame-retardant char forming agent, and particularly relates to a preparation method of the graphite-base flame-retardant char forming agent. The invention aims to solve the problems of poor compatibility and difficult dispersion of flame-retardant expansible graphite in a polystyrene matrix and polymer solution. The preparation method comprises the following steps of: I, preparing expansible graphite with carboxyl on the surface; II, preparing acylating chlorination expansible graphite; III, preparing OH-C60 / expansible graphite copolymer; and IV, preparing the graphite-base flame-retardant char forming agent. The graphite-base flame-retardant char forming agent and a free radical polymer can form a copolymer which is highly compatible to the free radical polymer matrix. Chemical bond combination is carried out on fullerene and the expansible graphite, so that the flame retardance is improved. The preparation method is simple and low in cost, and is used for preparing the graphite-base flame-retardant char forming agent.

Description

technical field [0001] The invention relates to a preparation method of a char-forming agent for flame retardancy. Background technique [0002] In my country, with the improvement of people's living standards, building energy consumption such as heating, air conditioning, hot water supply, lighting, etc. has increased rapidly, so building energy conservation has become a key object of energy conservation and emission reduction in my country. The main means to reduce building energy consumption is to construct the external insulation system of buildings. Among the large-scale application of building energy-saving insulation materials, there are mainly expanded polystyrene foam (EPS), polyurethane foam (PU) and other products. With the increasing use and application of polystyrene foam board insulation materials, its flammability has gradually been exposed, seriously endangering the safety of people's lives and property. [0003] Expandable graphite is widely used in the pr...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C08F292/00C08F212/08C08L25/06C08L51/10
Inventor黎俊黄玉东胡桢刘丽王立军于洪涛赵锦豪
OwnerHARBIN INST OF TECH