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A preparation method of low thermal conductivity flame retardant graphene expandable polystyrene board

A technology of expandable polystyrene and graphene, which is applied in the field of building insulation materials, can solve the problems of high cost, long polymerization cycle, and large dosage, and achieve the effects of improving flame retardancy, improving thermal conductivity, and increasing utilization rate

Active Publication Date: 2019-04-23
三江云亭烯技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, adding graphene directly into the polymerization kettle will lead to long polymerization period, uncontrollable reaction, high viscosity and easy to condense in the middle of polymerization, and the utilization rate of graphene is low, which will lead to large dosage and high cost

Method used

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  • A preparation method of low thermal conductivity flame retardant graphene expandable polystyrene board
  • A preparation method of low thermal conductivity flame retardant graphene expandable polystyrene board
  • A preparation method of low thermal conductivity flame retardant graphene expandable polystyrene board

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preparation example Construction

[0027] A kind of preparation method of low thermal conductivity flame retardant graphene expandable polystyrene board, it is characterized in that, comprises the following steps:

[0028] A, the preparation of graphene and styrene slurry intermediate:

[0029] First add redox graphene with less than 20 layers into styrene for pre-dispersion, then add flame retardant, auxiliary flame retardant, active calcium carbonate and polyvinyl alcohol, and then grind to a fineness of 0.05~15μm, prepared graphene and styrene slurry intermediate, wherein the weight percentages of graphene, flame retardant and auxiliary flame retardant and styrene are 0.1%~1.0wt%, 0.5%~0.8wt% and 0.3%~0.5wt%, the weight percentages of active calcium carbonate, polyvinyl alcohol and graphene are 0.01~0.2wt% and 0.001~0.1wt%;

[0030] B. Suspension polymerization: Add deionized water and a weighed dispersant to the reactor, mix and stir for 15 to 45 minutes, then add the graphene and styrene slurry intermedia...

Embodiment 1

[0043] A, according to the amount added in Table 1, first join 0.3kg graphene into 50kg styrene for pre-dispersion, then add 3.5kg hexabromocyclododecane, 0.08kg tris(1-chloro-2-propane) phosphate Base) ester, 0.15kg decabromodiphenyl ether, 0.2kg antimony trioxide, 0.1kg zinc borate, 1.0kg active calcium carbonate and 0.1kg polyvinyl alcohol, and grind them in a grinder for 10-20min until the fineness is 0.05- 15 μm, to obtain the intermediate of graphene and styrene slurry;

[0044] B. Suspension polymerization: In a 3000L reactor, add 1500kg deionized water, start stirring, and add 1.5kg active calcium phosphate, 0.05kg sodium dodecylsulfonate, 2.0kg sodium tripolyphosphate, 1.8kg anhydrous Sodium sulfate, after stirring for 15 minutes, turn on the temperature rise, control the temperature rise rate at 0.5-2.0°C / min, add 500kg of styrene, then add the graphene slurry intermediate prepared in step A, and add 3.6kg of benzyl peroxide when the temperature rises to 50°C Acyl, ...

Embodiment 2

[0049] A, according to the amount added in Table 1, first join 0.3kg graphene into 50kg styrene for pre-dispersion, then add 3.5kg hexabromocyclododecane, 0.08kg tris(1-chloro-2-propane) phosphate Base) ester, 0.25kg decabromodiphenyl ether, 0.2kg antimony trioxide, 1.4kg active calcium carbonate and 0.08kg polyvinyl alcohol, and grind in a grinder for 10-20min to a fineness of 0.05-15μm to obtain graphite olefin and styrene pulp intermediates;

[0050] B. Suspension polymerization: In a 3000L reactor, add 1500kg deionized water, start stirring, and add 1.5kg active calcium phosphate, 0.05kg sodium dodecylsulfonate, 2.0kg sodium tripolyphosphate, 1.8kg anhydrous Sodium sulfate, after stirring for 15 minutes, turn on the temperature rise, control the temperature rise rate at 0.5-2.0°C / min, add 500kg of styrene, then add the graphene slurry intermediate prepared in step A, and add 3.6kg of benzyl peroxide when the temperature rises to 50°C Acyl, 1.2kg tert-butyl peroxybenzoate,...

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Abstract

The invention relates to a preparation method of a low-heat-conductivity and flame-retardant graphene expanding polystyrene board. The preparation method comprises the following steps: stirring and blending graphene, a flame retardant, a flame retardant adjuvant, activated calcium carbonate and polyvinyl alcohol to obtain a mixture, and grinding the mixture and styrene through a grinding machine till the fineness is 0.05 to 15 [mu]m to prepare uniformly dispersed slurry; adding water and a dispersing agent into a reaction kettle for uniform stirring, adding the prepared slurry and auxiliary materials such as an initiator and a nucleating agent, heating to the temperature of 88 to 92 DEG C, and carrying out low-temperature polymerization for 7 to 9 hours; sealing the kettle, adding a foaming agent, heating to the temperature of 118.5 to 123 DEG C, carrying out high-temperature polymerization for 3 to 6 hours, and ending the procedure till the temperature is constant; cooling the product to obtain graphene expanding polystyrene. The method avoids the phenomena of long polymerization period, difficulty in reaction control, easiness in kettle sticking due to high viscosity in a polymerization process and the like which are caused by adding additives such as graphite or the graphene in conventional synthesis of the expanding polystyrene, and the graphene expanding polystyrene board with the heat preservation effect and flame retardant performance which are higher than those of current graphite and a common white material.

Description

technical field [0001] The invention belongs to the technical field of building thermal insulation materials, and relates to a method for preparing a low thermal conductivity and flame retardant graphene expandable polystyrene board. Background technique [0002] Expandable polystyrene (EPS) is an important building insulation material. With the gradual enhancement of people's awareness of environmental protection and safety, people's requirements for the flame retardancy and thermal conductivity of insulation materials are also getting higher and higher. In terms of thermal conductivity, graphite is currently the material with the lowest thermal conductivity in China, and its thermal conductivity can reach as low as 0.033W / (m·K). According to the national standard GB / T 29906-2013 "Molded polystyrene board thin plaster exterior wall external insulation system material", the thermal conductivity of grade 039 is ≤0.039W / (m K), and the thermal conductivity of grade 032 is ≤0.03...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L25/06C08L29/04C08K13/02C08K3/04C08K5/02C08K5/521C08K5/06C08K3/22C08K3/38C08K3/26C08F112/08C08F2/18C08J9/14
CPCC08F112/08C08J9/141C08J2325/06C08J2429/04C08L25/06C08L2201/02C08L2203/14C08L29/04C08K13/02C08K3/04C08K5/02C08K5/521C08K5/06C08K3/2279C08K2003/387C08K2003/265C08F2/18
Inventor 侯树亭史继东李哲沈海斌卢杰谢娜娜
Owner 三江云亭烯技术有限公司