CN1392177A - Process for preparing PVC resin specially for nano modified chemical building material - Google Patents

Abstract

Deionzied water, nano calcium carbonate, carbonate, hexadecanol, polyoxyethylene ether and hydroxypropyl methyl cellulose are prepared into nano microemulsified calcium carbonate slurry through supersonic and microemulsifying treatment; nano microemulsified calcium carbonate slurry, soft water, EHP, hydroxypropyl methyl cellulose anjd PVA are fed to a polymerization reactor; the reactor is vacuum pumped, ethylene chloride monomer is added, the mixture is cold stirred and heated to polymerize, and the product is dried and packed. The produced material of present invention has excellent heat stability and high impact strength.

Description

The preparation method of PVC resin specially for nano modified chemical building material

The present invention relates to a kind of preparation method of PVC resin specially for nano modified chemical building material.

Traditional polyvinyl chloride resin adopts suspension polymerization process production, and its method: liquid chlorine ethene (VC) makes its polymeric method by mechanical stirring and action of evocating in water medium in the presence of dispersion agent.General used dispersion agent has polyvinyl alcohol, cellulose ethers, gelatinum etc.Initiator has benzoyl peroxide, Diisopropyl azodicarboxylate, dilauroyl peroxide (LPO), the peroxidation trimethylacetic acid tert-butyl ester (BPP) etc.The chemical building material material that it is made, its thermostability and shock strength are poor, particularly low temperature impact strength is poor especially, plastic shaping adds need add anti-impact modifier man-hour: as high-impact polymkeric substance such as CPE, ACR, EVA, MBS, ABS, improve weathering resistance and the shock strength of improving the PVC goods, the method of modification adopts blending and modifying technology, and this modified product has following shortcoming: 1) impact modifier costs an arm and a leg, the cost height; 2) homogeneity, intermiscibility is poor, effect is bad.

The preparation method who the purpose of this invention is to provide a kind of PVC resin specially for nano modified chemical building material.

In order to achieve the above object, the present invention takes following measures:

The preparation method's of PVC resin specially for nano modified chemical building material step is as follows:

1) 80 parts of deionized waters, 100 parts of nano-calcium carbonates, 0～10 part of carbonic ether, 0～0.6 part of hexadecanol, 0～0.2 part of Soxylat A 25-7, Vltra tears are carried out the ultrasonic microemulsified that involves for 0.1～1 part and handle, make nano-calcium carbonate microemulsified slurries.

2) 160 parts of soft water, EHP0.05～0.2 part, 0.06～0.15 part of Vltra tears, 0.03～0.12 part of polyvinyl alcohol, nano-calcium carbonate slurry are added polymeric kettle respectively for 1～10 part, vacuumize the back and add 100 parts of vinyl chloride monomers, cold stirring 15 minutes～1 hour is warming up to 55～60 ℃ of polymerizations then.

3) after polymerization finishes, precipitating drying, the packing of sieving.

The material that the present invention produces has good thermostability and resistance to impact shock, and particularly low temperature impact strength improves more than 4 times, and elongation at break improves more than 1 times.Low temperature impact strength is broken through-25 ℃ of high pointes, is the chemical building material preferred material.

Below in conjunction with embodiment the present invention is elaborated.

Embodiment 1:

The preparation method's of PVC resin specially for nano modified chemical building material step is as follows:

1) 100 parts of nano-calcium carbonates, 1～10 part of carbonic ether, Vltra tears are added deionized water for 0.1～1 part and carry out the ultrasonic microemulsified processing that involves, make nano-calcium carbonate microemulsified slurries;

2) add in the polymeric kettle respectively 160 parts of soft water, EHP0.05～0.2 part, 0.06～0.15 part of Vltra tears, 0.03～0.12 part of polyvinyl alcohol, nano-calcium carbonate slurry for 1～10 part, vacuumize the back and add 100 parts of vinyl chloride monomers, cold stirring 15 minutes～1 hour is warming up to 55～60 ℃ of polymerizations then;

3) after polymerization finishes, precipitating drying, the packing of sieving.

Embodiment 2:

1) 100 parts of nano-calcium carbonates, 0.1～0.6 part of hexadecanol, 0.05～0.2 part of Soxylat A 25-7, hydroxypropylcellulose are added deionized water for 0.1～1 part and carry out the ultrasonic microemulsified processing that involves, make nano-calcium carbonate microemulsified slurries;

2) add in the polymeric kettle respectively 160 parts of soft water, EHP0.05～0.2 part, 0.06～0.15 part of Vltra tears, 0.03～0.12 part of polyvinyl alcohol, nano-calcium carbonate slurry for 1～10 part, vacuumize the back and add 100 parts of vinyl chloride monomers, cold stirring 15 minutes～1 hour is warming up to 55～60 ℃ of polymerizations then;

3) after polymerization finishes, precipitating drying, the packing of sieving.

Claims (1)

1. the preparation method of PVC resin specially for nano modified chemical building material is characterized in that its step is as follows:

1) 80 parts of deionized waters, 100 parts of nano-calcium carbonates, 0～10 part of carbonic ether, 0～0.6 part of hexadecanol, 0～0.2 part of Soxylat A 25-7, Vltra tears are carried out the ultrasonic microemulsified that involves for 0.1～1 part and handle, make nano-calcium carbonate microemulsified slurries.

2) 160 parts of soft water, EHP0.05～0.2 part, 0.06～0.15 part of Vltra tears, 0.03～0.12 part of polyvinyl alcohol, nano-calcium carbonate slurry are added polymeric kettle respectively for 1～10 part, vacuumize the back and add 100 parts of vinyl chloride monomers, cold stirring 15 minutes～1 hour is warming up to 55～60 ℃ of polymerizations then.

3) after polymerization finishes, precipitating drying, the packing of sieving.