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In-situ suspension polymerization preparation method of nanocomposite material consisting of polyvinyl chloride and silicon dioxide and product thereof

A nano-composite material and silica technology, which is applied in the field of nano-silica modification, can solve problems such as difficulty in controlling sticking kettles, and achieve stable monomer suspension droplets, improved controllability, and increased compatibility. Effect

Active Publication Date: 2010-10-06
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the in-situ suspension polymerization of polyvinyl chloride, due to the existence of inorganic nanoparticles, the suspension droplets of vinyl chloride monomer are unstable, which often makes the polymerization process difficult to control and leads to the occurrence of sticking phenomenon.

Method used

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  • In-situ suspension polymerization preparation method of nanocomposite material consisting of polyvinyl chloride and silicon dioxide and product thereof
  • In-situ suspension polymerization preparation method of nanocomposite material consisting of polyvinyl chloride and silicon dioxide and product thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0052] 1. Preparation of modified nano-silica: disperse 10g of nano-silica with an average particle size of 12 nm in 400ml of toluene, heat to 120°C under stirring, add 10g of dimethylchlorosilane, and Keep stirring and reacting for 12 hours, then filter, wash the filtrate several times with a mixed solvent of ethanol and water 1:1 (volume ratio), dry the washed silicon dioxide in a vacuum oven at 110°C, grind and pass A 200-mesh sub-sieve was used to obtain the modified nano-silica.

[0053] 2. Prepare the nanocomposite material that polyvinyl chloride and silicon dioxide form: under the protection of nitrogen, with modified nano silicon dioxide 1.10g (modified nano silicon dioxide and vinyl chloride monomer mass percent are 0.1%), remove Add 1800ml of ionized water, 0.5g of dibenzoyl peroxide initiator, and 0.5g of hydroxypropyl methylcellulose as dispersant into the suspension polymerization reactor, and then inject 1100g of vinyl chloride monomer. Stir at a slow speed of ...

Embodiment 2

[0055] 1. Preparation of modified nano-silica: Disperse 10g of nano-silica with an average particle size of 25 nm in 200ml of dimethyl sulfoxide, heat to 120°C under stirring, add 25g of octadecyl trimethyl Oxysilane, keep stirring and reacting at the above temperature for 12 hours and then filter, wash the filtrate several times with a mixed solvent of ethanol and water 1:1 (volume ratio), and put the washed silicon dioxide in a vacuum oven at 110 ℃ drying, grinding and passing through a 200-mesh sieve to obtain modified nano silicon dioxide.

[0056] 2. Prepare the nanocomposite material that polyvinyl chloride and silicon dioxide form: under nitrogen protection, with modified nano silicon dioxide 11.0g (modified nano silicon dioxide and vinyl chloride monomer mass percentage are 1%), remove Add 2000ml of ionized water, 0.6g of initiator azobisisoheptanonitrile, and 0.5g of dispersant methylcellulose into the suspension polymerization reactor, and then inject 1100g of vinyl ...

Embodiment 3

[0058] 1. Preparation of modified nano-silica: Disperse 10g of nano-silica with an average particle size of 50 nm in 300ml of acetone, heat to 130°C under stirring, add 30g of hexamethyldisilazane, and Keep stirring and reacting at the above temperature for 6 hours and then filter, wash the filtrate with a mixed solvent of ethanol and water 1:1 (volume ratio) several times, dry the washed silica in a vacuum oven at 110°C, and grind Pass through a 200-mesh sieve to obtain modified nano silicon dioxide.

[0059] 2. prepare the nanocomposite material that polyvinyl chloride and silicon dioxide form: under nitrogen protection, with modified nano silicon dioxide 50.0g (modified nano silicon dioxide and vinyl chloride monomer mass percent are 5%), remove 2500ml of ionized water, 0.8g of bis(2-ethylhexyl) peroxydicarbonate as initiator, 0.3g of gelatin as dispersant and 0.5g of methyl cellulose were added into the suspension polymerization reactor, and then 1000g of vinyl chloride mo...

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Abstract

The invention belongs to the field of a nanocomposite material of polyvinyl chloride and silicon dioxide, in particular to an in-situ suspension polymerization preparation method of the nanocomposite material consisting of the polyvinyl chloride and the silicon dioxide and a product thereof, as well as a modification technology of nano-silicon dioxide used for the nanocomposite material. The preparation method prepares the nanocomposite material consisting of the polyvinyl chloride and the silicon dioxide through the in-situ suspension polymerization method, which comprises the steps of uniformly dispersing the modified nano-silicon dioxide in vinyl chloride monomers and carrying out in-situ suspension polymerization by regulating the parameters of the polymerization process, thereby realizing the control of particle size of polyvinyl chloride particles and effectively preventing sticking a kettle. Various properties of polymerized resin are greatly improved in comparison with the pure polyvinyl chloride resin, and the method is simple and easy to operate, thereby conveniently controlling the composition, the structure and the properties of the composite material and being characterized by stable structure and uniform dispersion of inorganic nano-particles.

Description

technical field [0001] The invention belongs to the field of polyvinyl chloride and silicon dioxide nanocomposite materials, in particular to a preparation method for in-situ suspension polymerization of a nanocomposite material composed of polyvinyl chloride and silicon dioxide and its products, as well as the nanocomposite material used Modification technology of nano-silica. Background technique [0002] Polyvinyl chloride, usually referred to as PVC resin, is a general-purpose thermoplastic with excellent wear resistance, chemical corrosion resistance, comprehensive mechanical properties, electrical insulation, heat insulation, etc., and is widely used in building materials, packaging, Insulation materials and other fields, but its poor thermal stability, poor impact resistance, difficult processing and other defects limit its application. [0003] Adding inorganic particles to PVC polymers to prepare PVC composite materials can effectively improve the overall performan...

Claims

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Application Information

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IPC IPC(8): C08F114/06C08F2/44C08F2/20C08K9/04C08K9/06C08K3/36C08L27/06
Inventor 阳明书文斌张世民王峰丁艳芬
Owner INST OF CHEM CHINESE ACAD OF SCI
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