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
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[0025] Example 1
[0026] Add 5g Desmodur BL3370, 10g polyamide 300#, 3g dibutyl tin dilaurate, 200g PVC paste resin, 4g carbon black and 4g sodium bentonite and hydrogenated castor oil in a ratio of 1:3 to 300g The mass ratio of butyl ester to dioctyl adipate is 2:1 and uniformly dispersed in the mixed plasticizer, and then 450g is added to the system in batches, and a certain dispersion speed is controlled to make the system disperse at a high speed while maintaining 50℃ 1h, then vacuum degassing for 5h.
[0027] The black paste-like PVC plastisols prepared above have little increase in viscosity after being stored for half a year (initial viscosity 35Pa·s / 25°C, after half a year the viscosity is 50Pa·s / 25°C), and the performance remains unchanged. Coat the plastisol on a tinplate, 0.5mm thick, inverted for 3min, the glue will not sag. After curing at 130°C for 30 minutes, the coating hardness was 49A (Shore hardness), and the adhesion test result was cohesive failure.
Example Embodiment
[0028] Example 2
[0029] Add 5g Desmodur BL3370, 10g polyamide 300#, 3g dibutyl tin dilaurate, 200g PVC paste resin, 4g carbon black and 4g sodium bentonite and hydrogenated castor oil in a ratio of 3:1 to 300g phthalic acid The mass ratio of butyl ester to dioctyl adipate is 1:2 to be uniformly dispersed in the mixed plasticizer, and then 450g is added to the system in batches, and a certain dispersion speed is controlled to make the system disperse at a high speed for 1h while maintaining at 50℃ , And then vacuum degassing for 5h.
[0030] The black paste-like PVC plastisols prepared above have little increase in viscosity after storage for half a year (initial viscosity 35Pa·s / 25°C, after half a year the viscosity is 55Pa·s / 25°C), and the performance remains unchanged. Coat the plastisol on a tinplate, 0.5mm thick, inverted for 3min, the glue will not sag. After curing at 130°C for 30 minutes, the coating hardness was 56A (Shore hardness), and the adhesion test result was coh...
Example Embodiment
[0031] Example 3
[0032] Add 10g Desmodur BL3370, 5g polyamide 300#, 3g dibutyl tin dilaurate, 200g PVC paste resin, 4g carbon black and 4g sodium bentonite and hydrogenated castor oil in a ratio of 1:3 to 250g The mass ratio of butyl ester to dioctyl adipate is 2:1 and uniformly dispersed in the mixed plasticizer, and then 450g is added to the system in batches, and a certain dispersion speed is controlled to make the system disperse at a high speed while maintaining 50℃ 1h, then vacuum degassing for 5h.
[0033] The black paste-like PVC plastisols prepared above have little increase in viscosity after being stored for half a year (initial viscosity is 45Pa·s / 25°C, and after half a year the viscosity is 65Pa·s / 25°C), and its performance remains unchanged. Coat this plastisol on a tinplate, 0.5mm thick, inverted for 3min, the glue will not sag. After curing at 130°C for 30 minutes, the coating hardness was 51A (Shore hardness), and the adhesion test result was cohesive failure. ...
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