Halogen-free flame-retardant polystyrene foam composite material and preparation method thereof

A technology of polystyrene foam and composite materials, which is applied in the field of polystyrene foam and its preparation, can solve the problems of high density of flame-retardant foam, increase of thermal conductivity, and influence on thermal insulation performance, and achieve excellent thermal insulation performance, density and production cost The effect of reducing and preventing the spread of flames

Active Publication Date: 2014-08-13
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another example is CN102675762A, which reports a EPS foam that uses halogen-free flame-retardant glue and expandable graphite to synergistically flame-retardant. Although the foam has a high limiting oxygen index, it can also pass the UL-94V-0 grade, but the added flame-retardant Burning the coating layer will greatly increase its thermal conductivity (0.037-0.043W/mK, which is greatly improved compared with 0.030-0.032W/mK of pure EPS f

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Put 100 parts of expandable polystyrene particles into an oven at 120°C, keep for 5 minutes to obtain foamed polystyrene foam particles, and then place them at normal temperature and pressure to mature; add 50 parts of sodium alginate, Put 5 parts of sodium chloride, 50 parts of montmorillonite and 10 parts of expandable graphite into 1000 parts of water, stir for 2 hours to disperse evenly to obtain sodium alginate gel, add polystyrene foam particles to sodium alginate gel , and fully stirred and mixed evenly; finally, the mixture was molded at room temperature, and the molded sample was frozen at -40°C until solid, then vacuum-dried at -80°C for 0.5 days, and then baked in an oven at 65°C until constant weight to get the final product.

[0030] The apparent density of the foam material is 34kg / m 3 ; The vertical combustion level can reach V-0, the limiting oxygen index can reach 35.5%, and the thermal conductivity is 0.033W / mK.

Embodiment 2

[0032] Put 100 parts of expandable polystyrene particles into an oven at 110°C and keep for 20 minutes to obtain foamed polystyrene foam particles, which are then placed at normal temperature and pressure to mature; 50 parts of PVA, 7.5 parts Put glutaraldehyde, 25 parts of kaolinite and 15 parts of aluminum hypophosphite into 1000 parts of water, stir for 3 hours to disperse evenly to obtain uniform PVA gel; add polystyrene foam particles to PVA gel, and stir well Mix well; finally the mixture is molded at room temperature, and the molded sample is frozen at -70°C until solid, then vacuum-dried at -25°C for 2 days, and then dried in an oven at 55°C to constant weight to obtain the final product.

[0033] The apparent density of the foam material is 32kg / m 3 ; The vertical combustion level can reach V-0, the limiting oxygen index can reach 33.5%, and the thermal conductivity is 0.033W / mK.

Embodiment 3

[0035] Put 100 parts of expandable polystyrene particles into an oven at 115°C and keep for 15 minutes to obtain foamed polystyrene foam particles, and then place them at normal temperature and pressure to mature them; add 10 parts of sodium alginate, Put 10 parts of rectorite and 10 parts of microcapsule red phosphorus into 1000 parts of water, and stir under high-speed stirring for 4 hours to obtain a uniform sodium alginate gel; add polystyrene foam particles to the sodium alginate gel, and fully Stir and mix evenly; finally the mixture is molded at room temperature, and the molded sample is frozen at -90°C until solid, then vacuum-dried at -50°C for 1 day, and then baked in an oven at 60°C to constant weight to obtain Final product.

[0036] The apparent density of the foam material is 21kg / m 3 ; The vertical combustion level can reach V-0, the limiting oxygen index can reach 26.0%, and the thermal conductivity is 0.031W / mK.

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Abstract

The invention discloses a halogen-free flame-retardant polystyrene foam composite material which is prepared through the following steps: evenly mixing 100 parts of foam particles prepared by a conventional technology with a binder which consists of 10-80 parts of an aerogel matrix, 0-10 parts of an aerogel crosslinking agent, 10-50 parts of nano clay and 10-40 parts of a halogen-free flame retardant so as to obtain a mixture, performing compression-molding refrigeration and drying the mixture, wherein the weight ratio of the foam particles to the aerogel matrix binder in the foam composite material is 1:(0.3-1.8), the density is 21-44kg/m<3>, the vertical burning grade is UL-94V-0, the limit oxygen index is 26-45% and the heat conductivity is 0.031-0.035W/mK. Since the aerogel is low in density and heat conductivity, excellent in binding performance, and capable of jointly acting with nano clay and halogen-free flame retardant to provide outstanding flame retarding performance and charring performance, the foam composite material can keep low density and good heat preserving performance and the flame retarding performance of the composite material is greatly enhanced; besides, the technology is mature, simple to operate, easy to control and beneficial to popularization and application.

Description

technical field [0001] The invention belongs to the technical field of polystyrene foam and its preparation, and in particular relates to a halogen-free flame-retardant polystyrene foam composite material and a preparation method thereof. Background technique [0002] The polymer foam material has excellent comprehensive properties, and has the advantages of light weight, high specific strength, chemical corrosion resistance, thermal insulation, sound absorption and noise reduction, shock absorption, softness, insulation, easy processing and high cost performance. At present, the most important polymer foam materials are expandable polystyrene foam (EPS), extruded polystyrene foam (XPS), polyurethane foam (PU) and polyvinyl chloride foam (PVC). In my country, expandable polystyrene foam is the most used type of foam, and its total production and consumption both rank first in the world. In 2011, the total domestic EPS production has exceeded 4.75 million tons, accounting for...

Claims

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Application Information

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IPC IPC(8): C08L25/06C08L5/04C08L29/04C08L1/26C08K13/02C08K3/34C08K3/04C08K3/32C08K3/02C08K5/521C08K5/3492C08J9/236
Inventor 王玉忠颜渊巍商珂简荣坤黄鉴前陈力
Owner SICHUAN UNIV
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