Conducting primer for electrostatic coating of plastic base material and preparation method thereof

Abstract

The invention discloses a conducting primer for electrostatic coating of a plastic base material and a preparation method thereof. The conducting primer comprises the following components in parts by weight: 5-10 parts of thermoplastic acrylic resin, 5-10 parts of polyester resin, 0.5-2 parts of epoxy resin, 40-60 parts of mixed solvent, 0-2 parts of pigment dispersing agent, 3-10 parts of rutile titanium dioxide pigment, 0.5-3 parts of conductive carbon black pigment, 0.5-2 parts of gas-phase silicon dioxide, 10-20 parts of polyolefin resin, 0-0.5 part of leveling agent, 0-0.5 part of defoaming agent and 5-15 parts of high-boiling-point aromatic hydrocarbon solvent. The invention also comprises the preparation method of the conducting primer for electrostatic coating of the plastic base material. The conducting primer disclosed by the invention has the advantages of good single-component stability, good adhesive force with multiple plastic base materials, good water resistance and humidity-heat resistance, excellent heat-shock resistance and lower cost.

Description

technical field [0001] The invention relates to a conductive primer and a preparation method thereof, in particular to a conductive primer for electrostatic coating of plastic substrates and a preparation method thereof. Background technique [0002] At present, non-conductive primers are widely used on plastic substrates in the market. The upper paint and varnish cannot be sprayed electrostatically, and can only be sprayed manually or automatically, resulting in a high amount of paint for the top coat, and for irregular workpieces, it will form Spray leaks and color inconsistencies. [0003] CN102277057A disclosed a conductive primer for electrostatic coating of plastic substrates and a preparation method thereof on December 14, 2011. The conductive primer consists of thermosetting acrylic resin, thermoplastic acrylic resin, conductive titanium white pigment, carbon black pigment, dispersed Agents, solvents, substrate wetting agents. The conductive primer has the followin...

AI Technical Summary

Problems solved by technology

The conductive primer has the following defects: 1) It uses a large amount (20-40%) of expensive conductive titanium dioxide pigments to achieve conductivity, and the cost is too high; 2) It is only suitable for medium and high polarity plastics such as ABS and PC, and is not suitable for widely used Low-polarity plastics such as PP, TPO, etc. are difficult to adhere to, especially not suitable for automotive PP plastic parts (such as bumpers, door sills, anti-scratch strips, etc.)

[0004] At present, most of the automotive plastic parts used in the market have the following problems: 1) One-component ordinary primer, although good in stability, has poor water resistance, heat, humidity, and thermal shock resistance; 2) Two-component ordinary primer, although the performance Good, but the construction period is short after mixing, which cannot meet the requirements of one-component primer tank recycling

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