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Low-temperature-plasticized high-thixotropy PVC (Poly Vinyl Chloride) plastisol and preparation method thereof

A technology of plastisol and thixotropy, which is applied in the field of PVC plastisol, can solve problems such as strong temperature dependence, and achieve the effects of improving practicability, improving physical and chemical properties, and facilitating the spraying process

Inactive Publication Date: 2012-09-19
HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydrogenated castor oil is a thixotropic agent with a strong ability to improve thixotropy, but it has a strong dependence on temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 5g of Desmodur BL3370, 10g of polyamide 300#, 3g of dibutyltin dilaurate, 200g of PVC paste resin, 4g of carbon black and 4g of sodium bentonite and hydrogenated castor oil in a ratio of 1:3 to 300g of diphthalate Disperse evenly in a mixed plasticizer with a mass ratio of butyl ester to dioctyl adipate of 2:1, then add 450g into the system in batches, control a certain dispersion speed to make the system disperse at a high speed while maintaining 50°C 1h, then vacuum defoaming for 5h.

[0027] The viscosity of the black paste PVC plastisol prepared above did not increase much after being stored for half a year (the initial viscosity was 35Pa·s / 25°C, and the viscosity after half a year was 50Pa·s / 25°C), and the reusability remained unchanged. Coat the plastisol on a tin plate with a thickness of 0.5 mm, and invert it for 3 minutes, and the glue will not sag. After curing at 130°C for 30 minutes, the hardness of the coating was 49A (Shore hardness), and the result o...

Embodiment 2

[0029] Add 5g of Desmodur BL3370, 10g of polyamide 300#, 3g of dibutyltin dilaurate, 200g of PVC paste resin, 4g of carbon black and 4g of sodium bentonite and hydrogenated castor oil in a ratio of 3:1 to 300g of diphthalate Disperse evenly in a mixed plasticizer with a mass ratio of butyl ester to dioctyl adipate of 1:2, then add 450g to the system in batches, control a certain dispersion speed to make the system disperse at a high speed for 1 hour while maintaining 50°C , and then vacuum defoaming for 5h.

[0030] After half a year of storage of the black paste PVC plastisol prepared above, the viscosity does not increase much (the initial viscosity is 35Pa·s / 25°C, the viscosity after half a year is 55Pa·s / 25°C), and the reuse performance remains unchanged. Coat the plastisol on a tin plate with a thickness of 0.5 mm, and invert it for 3 minutes, and the glue will not sag. After curing at 130°C for 30 minutes, the hardness of the coating was 56A (Shore hardness), and the re...

Embodiment 3

[0032] Add 10g of Desmodur BL3370, 5g of polyamide 300#, 3g of dibutyltin dilaurate, 200g of PVC paste resin, 4g of carbon black and 4g of sodium bentonite and hydrogenated castor oil in a ratio of 1:3 to 250g of diphthalate Disperse evenly in a mixed plasticizer with a mass ratio of butyl ester to dioctyl adipate of 2:1, then add 450g into the system in batches, control a certain dispersion speed to make the system disperse at a high speed while maintaining 50°C 1h, then vacuum defoaming for 5h.

[0033]The viscosity of the black paste PVC plastisol prepared above did not increase much after being stored for half a year (the initial viscosity was 45Pa·s / 25°C, and the viscosity after half a year was 65Pa·s / 25°C), and the reusability remained unchanged. Coat the plastisol on a tin plate with a thickness of 0.5 mm, and invert it for 3 minutes, and the glue will not sag. After curing at 130°C for 30 minutes, the hardness of the coating was 51A (Shore hardness), and the result of...

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Abstract

The invention relates to low-temperature-plasticized high-thixotropy PVC (Poly Vinyl Chloride) plastisol. According to a plastisol composition, the plasticizing temperature of a sizing material can be lowered greatly, high thixotropy is achieved, and the adhesion of the sizing material on substrates such as tinplate and the like is ensured simultaneously. The plastisol comprises a PVC paste resin, a plasticizing agent, a thermal stabilizer, an enclosed polyurethane pre-polymer, a low molecular polyamide resin, a thixotropic agent, talc powder and carbon black. A preparation method of the PVC plastisol comprises the following steps of: adding the enclosed polyurethane pre-polymer, a dimeric dibasic acid low molecular polyamide resin, the thermal stabilizer, the PVC paste resin, the carbon black and the thixotropic agent into the plasticizing agent, and dispersing uniformly; adding the talc powder into a system in batch for dispersing at a high speed for 1 hour; and performing vacuum defoamation for 5 hours. The prepared plastisol can be mainly applied on the aspects of anti-chip coatings, welding line sealing gum and the like.

Description

technical field [0001] The invention relates to the field of PVC plastisols, in particular to a low-temperature plasticized high-thixotropy PVC plastisol and a preparation method thereof. Background technique [0002] PVC plastisols are widely used in the automotive coating industry, especially in PVC anti-stone chip coatings, PVC weld sealants and PVC gutters. PVC plastisol has a certain degree of adhesion to the painted steel plate of the car, has good compatibility with the top paint of the car, has excellent sealing performance, water resistance, oil resistance, and has a single component, stable storage and good elasticity , Excellent resistance to chemical media and so on. [0003] At present, the plasticizing temperature of most PVC plastisol products is generally high, but only some of the relatively high-end products have a plasticizing temperature as low as 130°C. High plasticizing temperatures are bound to be accompanied by high oven temperatures. This not only ...

Claims

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Application Information

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IPC IPC(8): C09D127/06C09D175/04C09D177/08C09D7/12
Inventor 马贵平聂俊蒋乙峰方大为
Owner HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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