Composite flame-retardant expandable polystyrene particles and preparation technology thereof

An expandable polystyrene and composite flame-retardant technology, which is applied in the field of composite flame-retardant expandable polystyrene particles and its preparation process, can solve the problems of poor fusion performance, difficulty in forming, shrinkage and collapse of foam products, and affecting use Performance and other issues, achieve good stability and low volatility, reduce adverse effects, and improve flow properties

Inactive Publication Date: 2012-09-12
BEIJING HUACHEN DECHUANG CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the particularity of EPS flame retardant treatment, there are not many types of flame retardants that can actually be used, mainly halogenated flame retardants, phosphorus flame retardants, inorganic flame retardants and intumescent flame retardants, among which organic bromine Substituted aliphatic hydrocarbons still occupy an absolute advantage, but because their combustion can release toxic and corrosive gases, which will cause serious pollution to the environment, therefore, it is the development trend to find flame retardants and preparation methods suitable for EPS addition, and to improve the flame retardants. The safety and environmental protection performance of combustible EPS is urgently needed by the market
[0004] The patent application number is 99814252.2, and in the patent titled the preparation process of expanded polystyrene particles, the method of using expanded graphite as a flame retardant or using expanded graphite and phosphorus compounds as a flame retardant for polystyrene particles at the same time is disclosed. However, the addition of the flame retardant in this patent is added during or after the polymerization reaction. This method has a great impact on the foamability and stability of polystyrene particles, and the prepared foam products are easy to Shrinkage and collapse, flame retardant falling off, and its poor welding performance is not easy to form, which affects its performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The preparation steps of composite flame-retardant expandable polystyrene particles are as follows: (1) Put 1 part of expanded graphite and 12 parts of red phosphorus into a reaction kettle loaded with 100 parts of styrene monomer and stir evenly, while adding Add 0.24 parts of white oil, 0.24 parts of polyethylene wax, 0.08 parts of dicumyl peroxide and 0.48 parts of benzoyl peroxide to the above styrene monomer; (2) add 100 parts of water to another reaction kettle, add 0.1 part of polyvinyl alcohol, dissolved at 80 degrees, after the polyvinyl alcohol is dissolved, add 1 part of tricalcium phosphate; (3) Add the solution obtained in step (1) to the solution in step (2), and adjust the speed at 500 rev / min, heat to 90 degrees, carry out constant temperature reaction, add 0.8 parts of tricalcium phosphate after reaction for 1.5 hours, continue constant temperature reaction for 3.5 hours, at this time, the particle polymerization is more than 90%, add pentane, heat up t...

Embodiment 2

[0016] The preparation steps of composite flame-retardant expandable polystyrene particles are as follows: (1) put 5 parts of expanded graphite and 7 parts of ammonium polyphosphate into a reaction kettle loaded with 100 parts of styrene monomer and stir evenly, while Add 0.5 parts of white oil, 0.5 parts of polyethylene wax, 0.05 parts of dicumyl peroxide and 0.2 parts of benzoyl peroxide to the above styrene monomer; (2) add 130 parts of water to another reaction kettle, Add 0.2 parts of polyvinyl alcohol and dissolve it at 80 degrees. After the polyvinyl alcohol is dissolved, add 0.6 parts of tricalcium phosphate; (3) Add the solution obtained in step (1) to the solution in step (2), and adjust the speed At 300 rev / min, heat to 90°C, carry out constant temperature reaction, add 0.5 parts of tricalcium phosphate after 2 hours of reaction, continue constant temperature reaction for 2 hours, at this time, the particle polymerization is more than 90%, add pentane, heat up to 130...

Embodiment 3

[0018] The preparation steps of composite flame-retardant expandable polystyrene particles are as follows: (1) Load 10 parts of expanded graphite and 1 part of ammonium polyphosphate and xylyl phosphate into a reaction kettle loaded with 100 parts of styrene monomer And stir evenly, add 0.1 part of white oil, 0.1 part of polyethylene wax, 0.2 part of dicumyl peroxide and 0.8 part of benzoyl peroxide to the above styrene monomer; (2) in another reaction kettle Add 150 parts of water, add 0.4 parts of polyvinyl alcohol, dissolve at 80 degrees, and add 1.1 parts of tricalcium phosphate after the polyvinyl alcohol is dissolved; (3) Add the solution obtained in step (1) to the solution of step (2) In the solution, the rotation speed is adjusted at 600 rpm, heated to 90 degrees, and a constant temperature reaction is performed. After 1 hour of reaction, 1 part of tricalcium phosphate is added, and the constant temperature reaction is continued for 5 hours. At this time, more than 90%...

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Abstract

Disclosed are composite flame-retardant expandable polystyrene particles and a preparation technology thereof. The particles are prepared from the following components of: by weight, 100 parts of styrene monomer, 100-150 parts of water, 1-10 parts of expandable graphite, 1-12 parts of a phosphorus compound, 0.1-0.5 part of white oil, 0.1-0.5 part of polyethylene wax, 0.05-0.2 part of dicumyl peroxide, 0.2-0.8 part of benzoyl peroxide, 0.1-0.4 part of polyvinyl alcohol, 1.1-2.1 parts of tricalcium phosphate and 8-12 parts of pentane. By the addition of a composite fire retardant of expandable graphite and the phosphorus compound before polymerization of styrene, adverse influence of the fire retardant on performance of the product is reduced; expandable graphite and the phosphorus compound are halogen-free fire retardants, the particles have good environmental protection performance; by the addition of white oil, the particles have plasticising and internal lubricant functions as well as good stability and low volatility, and fluidity during the forming of polystyrene particles can be greatly improved; polyvinyl alcohol and tricalcium phosphate are dispersion stabilizers and by timely adding a proper amount of the dispersion stabilizers, the product appearance can be improved, the production efficiency can be raised, and cost can be reduced; and the addition of all the components guarantees the performance of the product.

Description

technical field [0001] The invention relates to a foamable polystyrene particle with flame retardant properties, used for producing construction and packaging materials and a preparation process thereof. Background technique [0002] Expandable polystyrene (EPS) has a low cost and a series of excellent performance, and its output ranks first among the three largest foamed plastics polyurethane (PU), polystyrene (EPS) and polyvinyl chloride (PVC). two. EPS is a very ideal building material. As an external thermal insulation composite wall, it has a very good energy-saving effect, and plays the role of thermal insulation, sound insulation, sealing and blocking water vapor. With the increase of production and consumption year by year, its safety and fire hazard are also increasingly concerned, and it is urgent to improve its flame retardant performance. [0003] Due to the particularity of EPS flame retardant treatment, there are not many types of flame retardants that ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L25/06C08F112/08C08K13/04C08K7/24C08K3/02C08K3/32C08K5/523C08K5/01C08L29/04C08J9/16
Inventor 张子印关晓明
Owner BEIJING HUACHEN DECHUANG CHEM TECH
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