Process for producing coating material for improving capability of PVC sheet material

Abstract

The invention relates to a method for preparing a coating material for improving surface hydrophilicity and antistatic performance of a PVC sheet material. The proposal of the method comprises the following steps: adding ethyl orthosilicate, anhydrous ethyl alcohol, coupling agent and water into a container and mixing the mixture evenly, dripping concentrated nitric acid with mass fraction of 65 percent, adjusting pH value to between 2 and 4, magnetically stirring the mixture after being sealed, and sealing the mixture again and layering the mixture to obtain organic modified nano SiO2 ethanol dispersoid solution; and adding polymethyl methacrylate and tetrahydro furan or ethyl acetate into another container, stirring the mixture to dissolve the polymethyl methacrylate, and mixing the two solutions evenly to obtain the polymethyl methacrylate / SiO2 composite nano colloidal solution. The method overcomes the defect that surface free energy of PVC coated with PVDC latex has larger difference, and the coating has shrinkage holes, low bonding strength with a base material, is easy to fall off, has poorer hydrophilicity, and the like. The method reduces surface resistance of the PVC greatly, improves the surface hydrophilicity, has scratching resistance performance, and the like.

Description

technical field

[0001] The invention relates to a polymer composite nano material, in particular to a method for preparing a coating material for improving the surface hydrophilicity and antistatic performance of a PVC sheet. Background technique

[0002] PVC is a general purpose plastic used in industries such as leather, packaging and pipes. At present, the antistatic agents used for PVC in the market are mainly divided into two categories: internal additive type and surface coating type. The internally added antistatic agent will speed up the dehydrochlorination of PVC during the processing of PVC, which will not only reduce the thermal stability of PVC plastic processing and the transparency of the product, but also degrade the antistatic agent itself, weakening the antistatic effect . Although the surface-coated antistatic agent has the advantages of less dosage and quick effect, because it is mostly an ionic surfactant, it is easy to decontaminate the product due to ...

Examples

Embodiment 1

[0023] At room temperature, in a 50ml round bottom flask, add 8.32g tetraethyl orthosilicate (TEOS), 10g absolute ethanol, 2.78g H 2 O and 0.2g coupling agent (KH-560), mix well, add dropwise concentrated nitric acid with a mass fraction of 65%, adjust the pH value of the system to between 2-4, seal the magnetic stirring reaction at room temperature for 2.5 hours, and then seal Stratified for 5 days to obtain organically modified nano-SiO 2 Ethanol dispersion colloidal solution, nano-SiO 2 Solid content and coupling agent dosage are respectively 20% and 1% (such as Figure 5 shown).

[0024] Among them, TEOS is used as the precursor, absolute ethanol is used as the medium, and concentrated nitric acid with a mass fraction of 65% is used to adjust the pH value of the system to the sol-gel method; during the sol-gel method, a coupling agent with condensation polymerization functional groups KH-560 is a co-condensation polymerization method; any one of KH-550 or KH-560 or KH-5...

Embodiment 2

[0029] Change the THF solvent to 7.43g, organically modified nano-SiO 2 Ethanol dispersion colloidal solution is changed into 0.714g, and the remainder is the same as in Example 1. See the results Figure 5 As shown, nano-SiO 2 Solid content, amount of coupling agent, PMMA and SiO 2 The weight ratio and the water contact angle and surface resistance after coating PVC were 20%, 1%, 87.5:12.5, 29.5° and 1.3×10 10 Ω.

Embodiment 3

[0031] Change the THF solvent to 10.0g, organically modified nano-SiO 2 The ethanol dispersion colloidal solution is changed into 1.667g, and the remainder is the same as in Example 1. See the results Figure 5 As shown, nano-SiO 2 Solid content, amount of coupling agent, PMMA and SiO 2 The weight ratio and the water contact angle and surface resistance after coating PVC were 20%, 1%, 75:25, 46.5° and 1.2×10 9 Ω.

technical field

[0001] The invention relates to a polymer composite nano material, in particular to a method for preparing a coating material for improving the surface hydrophilicity and antistatic performance of a PVC sheet. Background technique

[0002] PVC is a general purpose plastic used in industries such as leather, packaging and pipes. At present, the antistatic agents used for PVC in the market are mainly divided into two categories: internal additive type and surface coating type. The internally added antistatic agent will speed up the dehydrochlorination of PVC during the processing of PVC, which will not only reduce the thermal stability of PVC plastic processing and the transparency of the product, but also degrade the antistatic agent itself, weakening the antistatic effect . Although the surface-coated antistatic agent has the advantages of less dosage and quick effect, because it is mostly an ionic surfactant, it is easy to decontaminate the product due to ...

Examples

Embodiment 1

[0023] At room temperature, in a 50ml round bottom flask, add 8.32g tetraethyl orthosilicate (TEOS), 10g absolute ethanol, 2.78g H 2 O and 0.2g coupling agent (KH-560), mix well, add dropwise concentrated nitric acid with a mass fraction of 65%, adjust the pH value of the system to between 2-4, seal the magnetic stirring reaction at room temperature for 2.5 hours, and then seal Stratified for 5 days to obtain organically modified nano-SiO 2 Ethanol dispersion colloidal solution, nano-SiO 2 Solid content and coupling agent dosage are respectively 20% and 1% (such as Figure 5 shown).

[0024] Among them, TEOS is used as the precursor, absolute ethanol is used as the medium, and concentrated nitric acid with a mass fraction of 65% is used to adjust the pH value of the system to the sol-gel method; during the sol-gel method, a coupling agent with condensation polymerization functional groups KH-560 is a co-condensation polymerization method; any one of KH-550 or KH-560 or KH-5...

Embodiment 2

[0029] Change the THF solvent to 7.43g, organically modified nano-SiO 2 Ethanol dispersion colloidal solution is changed into 0.714g, and the remainder is the same as in Example 1. See the results Figure 5 As shown, nano-SiO 2 Solid content, amount of coupling agent, PMMA and SiO 2 The weight ratio and the water contact angle and surface resistance after coating PVC were 20%, 1%, 87.5:12.5, 29.5° and 1.3×10 10 Ω.

Embodiment 3

[0031] Change the THF solvent to 10.0g, organically modified nano-SiO 2 The ethanol dispersion colloidal solution is changed into 1.667g, and the remainder is the same as in Example 1. See the results Figure 5 As shown, nano-SiO 2 Solid content, amount of coupling agent, PMMA and SiO 2 The weight ratio and the water contact angle and surface resistance after coating PVC were 20%, 1%, 75:25, 46.5° and 1.2×10 9 Ω.

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