Method for modifying polychloroethylene by in-situ polymerization of nano silicon dioxide

A nano-silica and polyvinyl chloride technology, applied in the field of chemical engineering, can solve the problems of easy decomposition, affecting the thermal stability and service life of materials, and difficult to solve the problem of nanoparticle agglomeration, and achieve thermal stability and aging resistance. Improve, excellent performance, good dispersion effect

Active Publication Date: 2009-07-08
河南海博瑞硅材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The advantage of the melt blending method is that it is easy to control the size and shape of the particles, but the disadvantage is that it is difficult to solve the problem of agglomeration of nanoparticles and cannot ensure that the nanoparticles are uniformly dispersed in the polymer matrix.
In addition, polyvinyl chloride is easily decomposed by heat during the melt blending process, which affects the thermal stability and service life of the material

Method used

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  • Method for modifying polychloroethylene by in-situ polymerization of nano silicon dioxide
  • Method for modifying polychloroethylene by in-situ polymerization of nano silicon dioxide
  • Method for modifying polychloroethylene by in-situ polymerization of nano silicon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Take 9.2g of nano-silica (with a particle size of about 20nm) modified by a carbon-carbon double bond-containing silane coupling agent on the surface, and then add a mixed solvent composed of 10g of ethanol and 25g of water to emulsify the system under high shear Emulsify and disperse on the machine for 20 minutes to obtain a reactive nano-silica emulsion.

[0019] (2) add deionized water 15kg, polyvinyl alcohol dispersant 6.5g, dibenzoyl peroxide and diisobutyryl peroxide composite initiator 5.3g and the reactivity in the step (1) composition to reactor Nano-silica emulsion, and an appropriate amount of sodium bicarbonate to adjust the pH value to 7-8, seal the reactor, and stir for 5 minutes; add 9100 g (10 L) of vinyl chloride monomer to the reactor, and stir for 10 minutes to make the system uniform; set the reaction The temperature is 61 °C, the temperature rises to initiate the polymerization reaction, and the pressure in the kettle increases with the temperat...

Embodiment 2

[0022] (1) Take 9.5g of nano-silica (with a particle size of about 30nm) modified by oleic acid on the surface, then add a mixed solvent composed of 10g of acrylic acid and 45g of water, and emulsify and disperse the system on a high-shear emulsifier for 20 minutes to obtain reactivity Nano silica emulsion.

[0023] (2) Add 15kg of deionized water, 6.5g of cellulose ether dispersant, 2.8g of tert-butyl peroxydicarbonate to the reaction kettle, and add an appropriate amount of ammonia water to adjust the pH value to 7-8, seal the reaction kettle, and stir for 5 minutes; Add 9100g (10L) of vinyl chloride monomer to the polymerization reactor, and stir for 10 minutes to make the system uniform; set the reaction temperature to 61°C, raise the temperature to initiate the polymerization reaction, and the pressure in the kettle will increase with the temperature rise and gradually tend to be stable; the reaction starts After 1 hour, pump the reactive nano-silica emulsion prepared in ...

Embodiment 3

[0026] (1) Take 20 g of nano-silica modified by acrylic acid on the surface, add 10 g of methacrylic acid and 50 g of deionized water, emulsify and disperse on a high-shear emulsifier until the system becomes a milky white uniform system.

[0027] (2) Add 15kg of deionized water, 7g of polyvinyl alcohol dispersant, 10g of azobisisobutyronitrile into a 30L polymerization reactor, and add a certain amount of sodium bicarbonate and ammonium bicarbonate to adjust the pH to 7-8 , close the reaction kettle, stir for 5min; add 9100g (10L) of vinyl chloride monomer to the reaction kettle, stir for 10min to make the system uniform, set the reaction temperature to 61°C, and raise the temperature to initiate the polymerization reaction; 1h after the temperature reaches the set temperature, use quantitative Add the above-mentioned reactive nano-silica emulsion into the polymerization reactor by the pump; the pressure in the reactor will naturally drop in the later stage of the reaction. Wh...

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Abstract

The invention relates to a preparation method for modified polyvinyl chloride material through the home position polymerization of reactive nanometer silicone oxide. The preparation method comprises the following steps: after the modification of the surface of the nanometer silicon dioxide through a modifier containing polymerisable carbon-carbon double bonds, fully dispersing the nanometer silicon dioxide into the mixed solvent formed by an organic solvent and water so as to obtain reactive nanometer silicon dioxide emulsion; carrying out the home position polymerization reaction of the emulsion and polyvinyl chloride; and removing unreacted polyvinyl chloride monomers after the reaction is finished, and carrying out material discharge, centrifugation and drying. The shock resistance and heat tolerance of the nanometer silicon dioxide modified polyvinyl chloride material can be both greatly improved. An X-ray photoelectron spectrum and an infrared spectrum show that the extraction test cannot completely wash off the polyvinyl chloride molecules on the surface of silicon dioxide particles, thereby demonstrating that the reactive nanometer particles are fixedly bonded with PVC molecular chains.

Description

technical field [0001] The invention belongs to the technical field of chemical engineering, and in particular relates to a preparation method of polyvinyl chloride material modified by in-situ polymerization of reactive nano silicon dioxide. Background technique [0002] Polyvinyl chloride (PVC) has the advantages of flame retardancy, insulation, chemical corrosion resistance, and low price, and is widely used in construction, light industry, agriculture, packaging, and daily use. However, in the processing and application of polyvinyl chloride, especially when it is used as a structural material, it also exposes defects such as low impact strength and poor thermal stability, which need to be modified in advance. Although the toughening effect of adding CPE, ACR, MBS and other rubber elastomers to the polyethylene matrix is ​​very significant, this traditional PVC toughening method sacrifices valuable properties such as stiffness, heat resistance and processing fluidity of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00
Inventor 李小红田爱娟束华东王志东李庆华张治军
Owner 河南海博瑞硅材料科技有限公司
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