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Method for preparing nano hydrotalcite and nano calcium carbonate composite modified polyvinyl chloride resin

A technology of polyvinyl chloride resin and nano-calcium carbonate, applied in the field of chemical engineering, can solve the problems of large polarity difference, inability to fully exert the modification effect, and low scale

Inactive Publication Date: 2008-01-16
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Nano-hydrotalcite and nano-calcium carbonate hydrotalcite are easy to agglomerate, and at the same time, they have a large polarity difference with PVC. It is difficult to achieve uniform nano-scale dispersion in PVC, and they cannot fully exert their respective modification effects on PVC. Therefore, it is necessary Adopt effective PVC / inorganic nanoparticles composite method to achieve uniform and low-scale dispersion of inorganic nanoparticles, and fully volatilize their respective modification effects on PVC

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add 1.0g of nano-hydrotalcite with a primary particle size of 20-60nm (Dalian Fumeida New Material Co., Ltd.), 1.0g of nano-calcium carbonate with a primary particle size of 40-80nm, and 0.1g of polyvinyl alcohol into 10g of deionized Ultrasonic dispersion in water for 30 minutes at 20° C. to obtain a dispersion of nano hydrotalcite and nano calcium carbonate.

[0025] Add the above dispersion, 100g vinyl chloride, 0.15g diethylhexyl peroxydicarbonate, 0.1g polyvinyl alcohol, 0.1g hydroxypropyl methylcellulose and 150g deionized water into the reactor, and stir at room temperature After 30 minutes, the temperature was raised to 57°C to start polymerization, until the pressure of the system dropped by 1.5kg / cm 2 , lower the temperature, remove unreacted monomers, discharge, filter, and dry to obtain 83.5g of nano-hydrotalcite and nano-calcium carbonate composite modified PVC resin.

Embodiment 2

[0027]Add 1.0g of primary particle size of 20-60nm nano-hydrotalcite (Dalian Fumeida New Material Co., Ltd.), 2.0g of primary particle size of 40-80nm nano-calcium carbonate, 0.2g of polyvinyl alcohol into 20g of deionized water, Ultrasonic dispersion was carried out at 50° C. for 10 minutes to obtain a dispersion liquid of nano hydrotalcite and nano calcium carbonate.

[0028] Add the above dispersion, 100g vinyl chloride, 0.15g diethylhexyl peroxydicarbonate, 0.1g polyvinyl alcohol, 0.1g hydroxypropyl methylcellulose and 150g deionized water into the reactor, and stir at room temperature After 30 minutes, the temperature was raised to 57°C to start polymerization, until the pressure of the system dropped by 1.5kg / cm 2 , cooling, removing unreacted monomers, discharging, filtering, and drying to obtain 83.0 g of nano-hydrotalcite and nano-calcium carbonate composite modified PVC resin.

Embodiment 3

[0030] Add 1.0g of primary particle size of 20-60nm nano-hydrotalcite (Dalian Fumeida New Material Co., Ltd.), 3.0g of primary particle size of 40-80nm nano-calcium carbonate, 0.3g of polyvinyl alcohol into 20g of deionized water, Ultrasonic dispersion was carried out at 50° C. for 30 minutes to obtain a dispersion liquid of nano hydrotalcite and nano calcium carbonate.

[0031] Add the above dispersion, 100g vinyl chloride, 0.15g diethylhexyl peroxydicarbonate, 0.1g hydroxypropyl methylcellulose and 150g deionized water into the reactor, stir at room temperature for 30min, then heat up to 57 Polymerization starts at °C until the pressure of the system drops by 1.5kg / cm 2 , lower the temperature, remove unreacted monomers, discharge, filter, and dry to obtain 82.4g of nano-hydrotalcite and nano-calcium carbonate composite modified PVC resin.

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Abstract

The invention relates to a preparation method of a polyvinyl chloride resin modified in compound by nano-hydrotalcite and nano-calcium carbonate. The steps of the preparation method are as follows: (1) 1.0g of the nano-hydrotalcite and 1.0 to 5.0g of the nano-calcium carbonate are added into 10 to 50g of deionized water containing 0.1 to 0.5g of dispersant, and are sheared and dispersed in ultrasonic or high speed for 10 to 60 min in the temperature of 20 to 100 DEG C, and the compound dispersion solution of the nano-hydrotalcite and the nano-calcium carbonate is obtained; (2) the compound dispersion solution of the nano-hydrotalcite and the nano-calcium carbonate, 0.05 to 0.50g of the initiator, 0.1 to 0.5g of the dispersant, 100g of vinyl chloride and 100 to 250g of the deionized water are put into a polymerization reactor and polymerized with the temperature being raised to 45 to 65 DEG C after being mixed for 10 to 60 min in room temperature until system pressure falls 0.5 to 2.5kg / cm2. Unreacted vinyl chloride is removed when the polymerization is finished, and then the polyvinyl chloride resin modified in compound by nano-hydrotalcite and nano-calcium carbonate is obtained after the material in the polymerization reactor is discharged, filtered and dried. The modified polyvinyl chloride prepared with the invention can become polyvinyl chloride compound material with uniform dispersed nano particles, improved thermal stability and mechanical property and low dense burning smoke through being processed.

Description

technical field [0001] The invention relates to the technical field of chemical engineering, in particular to a preparation method of nano hydrotalcite and nano calcium carbonate composite modified polyvinyl chloride resin. Background technique [0002] Polyvinyl chloride (PVC) has the characteristics of good comprehensive mechanical properties, flame retardancy, chemical corrosion resistance, etc., and can obtain hard, semi-rigid and soft products according to the amount of plasticizer added to meet different use requirements. However, PVC also has disadvantages such as poor thermal stability, high combustion smoke density, and low impact strength of hard products. Since PVC contains an unstable structure, it is easy to undergo a chain reaction of removing hydrogen chloride under heating conditions, which will cause undesirable color changes in the material and cause a decrease in the mechanical properties of the material. Therefore, it is necessary to add heat stabilizers ...

Claims

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Application Information

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IPC IPC(8): C08L27/06C08F114/06C08F2/44C08K9/00C08K3/26
Inventor 包永忠舒文晓徐绍荣韩金铭黄志明翁志学
Owner ZHEJIANG UNIV
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