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One-step preparation method for synthesizing black expandable polystyrene particles

A technology of expandable polystyrene and polyvinyl alcohol, which is applied in the field of preparation of expandable polystyrene particles, can solve problems such as increasing the extrusion granulation process, and achieve lower cost, lower polymerization inhibition, and reaction temperature low effect

Inactive Publication Date: 2009-10-21
吉林省吉盛源泡塑材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the performance has been improved, the process of extrusion granulation has been increased

Method used

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  • One-step preparation method for synthesizing black expandable polystyrene particles

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preparation example Construction

[0022] A preparation method for synthesizing black expandable polystyrene particles by one-step method comprises the following steps:

[0023] Pretreatment of carbon black:

[0024] According to carbon black: surfactant: deionized water = 1-2: 2-1: 40-50 (mass ratio), feed into a four-neck round bottom flask, heat in an automatic temperature-controlled water bath to maintain 70-85 ° C, and stir for 12 hours , washed with water, vacuum-filtered, and vacuum-dried for later use.

[0025] Synthesis of black expandable polystyrene particles:

[0026] a According to the percentage of monomer mass, add 0.2-0.5% of organic dispersant polyvinyl alcohol and 350-500% of deionized water into the autoclave, stir mechanically, keep the stirring speed at 210-350 rpm, and heat it in a water bath to 85- After the polyvinyl alcohol is fully dissolved at 93°C, cool down to 30-50°C and keep for 10-20 minutes, then add 1-2% of anhydrous sodium sulfate as an inorganic dispersant;

[0027] b Mix ...

Embodiment 1

[0032] Pretreatment of carbon black: 1.5 grams of carbon black; 1.5 grams of sodium dodecylbenzene sulfonate; 50 milliliters of deionized water were fed into a four-necked round-bottomed flask, heated in an automatic temperature-controlled water bath to maintain 70 ° C, and stirred for 12 hours. Wash with water, vacuum filter, and vacuum dry for later use.

[0033] Synthesis of black expandable polystyrene particles: Add 0.14 g of polyvinyl alcohol and 210 ml of deionized water to the autoclave in sequence, keep the stirring speed of a mechanical stirrer at 300 rpm, and heat to 92°C in an automatic temperature-controlled water bath After the polyvinyl alcohol is fully dissolved, cool down to 30°C, add 0.90 g of anhydrous sodium sulfate as an inorganic dispersant, and then add the mixed solution containing 0.12 g of modified light carbon black and 20 ml of deionized water dispersed by ultrasonic to In the reaction kettle, keep stirring at 30°C for 20 minutes so that the modifie...

Embodiment 2

[0036] Pretreatment of carbon black: 1.5 grams of carbon black; 1.5 grams of sodium dodecylsulfonate; 50 milliliters of deionized water were fed into a four-neck round bottom flask, heated in an automatic temperature-controlled water bath to maintain 80 ° C, stirred for 12 hours, and washed with water Vacuum filtration, vacuum drying for later use.

[0037] Synthesis of black expandable polystyrene particles: 0.15 g of polyvinyl alcohol and 215 ml of deionized water were added to the autoclave in sequence, the stirring speed of the mechanical stirrer was kept at 280 rpm, and the automatic temperature control water bath was heated to 93°C After fully dissolving the polyvinyl alcohol, lower the temperature to 35°C, add 0.80 g of activated calcium phosphate, and then add the ultrasonically dispersed mixture containing 0.20 g of modified light carbon black and 20 ml of deionized water into the autoclave , keep stirring at 35°C for 20 minutes to make the modified carbon black bette...

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Abstract

The invention relates to a one-step preparation method for synthesizing black polystyrene particles. The preparation method uses surfactant to pretreat carbon black so as to ensure that the carbon black is uniformly dispersed in suspending medium water instead of agglomerating; the carbon black is partially coated with organic dispersant so as to reduce the polymerization inhibition effect of the carbon black during polymerization; and as the polymerization proceeds, monomer phase viscosity increases, and carbon black particles are fixed inside a small ball. Therefore, the preparation method avoids the problem that the carbon black is poor in compatibility with polymers, and overcomes the disadvantages of poor black chromaticity, non-uniform carbon black dispersion and the like. The preparation method has the double function of protecting colloidal particles and reducing the polymerization inhibition effect of the carbon black, overcomes the polymerization inhibition effect of the carbon black in the process of polymerizing styrene, avoids the problem that the carbon black is poor in compatibility with polystyrene during a technological process, and simplifies the process of preparing black polystyrene. The preparation method has the advantages of low reaction temperature, simple process, convenient operation, friendliness to environment and low cost.

Description

technical field [0001] The invention belongs to the preparation of composite materials and the application of expandable polystyrene, in particular to the preparation of expandable polystyrene particles with narrow particle size distribution and good blackness. Background technique [0002] With the increasingly fierce competition in domestic and foreign markets, and with the expansion of the application of expandable polystyrene products, expandable polystyrene products are developing in the direction of multi-function and high performance. Expandable polystyrene with good blackness is widely used in automotive interior parts, handicrafts, packaging of electronic devices and other fields, and is a special material. At present, there is no one-step method for preparing black expandable polystyrene resin in China. [0003] In the production of black expandable polystyrene, the following three methods are generally used: the first is to make the usual expandable polystyrene r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/20C08F12/08C08K9/04C08F2/44
Inventor 缪晓杰严峻涛王洪艳颜静李俊峰
Owner 吉林省吉盛源泡塑材料科技有限公司
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