CN103483993A - Low-temperature curing powder paint - Google Patents

Abstract

The invention discloses a low-temperature curing powder paint which is prepared from the following raw materials in parts by weight: 50-60 parts of isophthalic unsaturated polyester resin, 20-25 parts of E-12, 0.1-0.5 part of silica white, 3.5-4.5 parts of lanthanum oxide, 10-13 parts of activated carbon powder, 1-2 parts of azodiisobutyronitrile, 2-3 parts of sodium silicate, 2-3 parts of ferrous sulfate, 1-2 parts of phenol aldehyde resin, 0.1-1 part of dimethyl silicon oil and 10-20 parts of composite filler. The low-temperature curing powder paint disclosed by the invention has the advantages of high transparency, low curing temperature, smooth surface, no bubbles and favorable film-forming property, and is suitable for application to wood. The spraying method of the powder paint comprises the following steps: preheating the object to 50-70 DEG C, keeping for 5-8 minutes, carrying out electrostatic spraying, blowing hot air with 120 DEG C or so for 20 minutes, and naturally cooling.

Description

A kind of low-temperature curable powder coating

Technical field

The present invention relates generally to a kind of coating, relates in particular to a kind of low-temperature curable powder coating.

Background technology

Its characteristic of powder coating has: 1, this product is containing toxicity, containing solvent with containing the virose material that volatilizees, therefore without poisoning, without the problem of the public hazards such as discharge of fire, nothing " three wastes ", meet the requirement of national environmental protection method fully.2, utilization rate of raw materials is high, the powder that the powder supplies business of some famous brand names produces, and it crosses the powder recoverable of spray, and the highest utilization ratio even can reach more than 99%.3, after the coated article pre-treatment, one-off construction, without primary coat, can obtain filming of adequate thickness, easily realizes automated operation, and production efficiency is high, can reduce costs.4, coating densification, sticking power, resistance to impact shock and toughness are all good, and corner coverage is high, have good resistance to corrosive chemicals energy and electrical insulation properties.5, powder coating storage, transportation safety and convenient.

Summary of the invention

The object of the invention is exactly for a kind of low-temperature curable powder coating is provided.

The present invention is achieved by the following technical solutions:

A kind of low-temperature curable powder coating is characterized in that what it was comprised of the raw material of following weight parts:

Metaphenylene unsaturated polyester resin 50-60, E-12 epoxy resin 20-25, white carbon black 0.1-0.5, lanthanum trioxide 3.5-4.5, activity charcoal powder 10-13, Diisopropyl azodicarboxylate 1-2, water glass 2-3, ferrous sulfate 2-3, resol 1-2, dimethyl silicone oil 0.1-1, compounded mix 10-20;

Described compounded mix is comprised of the raw material of following weight parts:

Gibbsite 30-40, attapulgite 20-30, silicon carbide 6-10, magnesium hydroxide 3-5, carboxymethyl cellulose 1-2, Jojoba oil 2-3;

Above-mentioned gibbsite, attapulgite, silicon carbide are mixed, insulation calcining 2-4 hour under 600-800 ℃, send into after discharging is cooling in ball mill and carry out the ball milling mixing, add again magnesium hydroxide and carboxymethyl cellulose, continue ball milling 1-2 hour, add ball milling after Jojoba oil is heated to 25-30 ℃, cross the 80-100 mesh sieve, obtain described compounded mix.

A kind of preparation method of low-temperature curable powder coating comprises the following steps:

Above-mentioned each raw material except white carbon black is mixed, send into high-speed mixer, 800-1000 rev/min of dispersed with stirring 3-5 minute, send into forcing machine, melt extrude, then be placed in shredder, add white carbon black, speed lapping under 1000-1200 r/min, the screen cloth that is 80-100 μ m after pore size, obtain described low-temperature curable powder coating.

Advantage of the present invention is:

Low-temperature curable powder coating provided by the invention, transparency is high, good dispersity, solidification value is low, in spraying process, the object thermal pretreatment, to 50-70 ℃, is kept to 5-8 minute, carry out electrostatic spraying, again through the hot blast 20min of 120 ℃ of left and right, naturally cooling and get final product, be applicable to the application of timber and plastics, any surface finish is without bubble, good film-forming property.

Embodiment

Embodiment 1,

A kind of low-temperature curable powder coating, it is comprised of the raw material of following weight parts (kilogram):

Metaphenylene unsaturated polyester resin 60, E-12 epoxy resin 25, white carbon black 0.5, lanthanum trioxide 4.5, activity charcoal powder 13, Diisopropyl azodicarboxylate 2, water glass 3, ferrous sulfate 3, resol 2, dimethyl silicone oil 0.1, compounded mix 10-20;

Described compounded mix is comprised of the raw material of following weight parts:

Gibbsite 40, attapulgite 30, silicon carbide 10, magnesium hydroxide 5, carboxymethyl cellulose 1, Jojoba oil 3;

Above-mentioned gibbsite, attapulgite, silicon carbide are mixed, under 800 ℃, the insulation calcining is 4 hours, send into after discharging is cooling in ball mill and carry out the ball milling mixing, add again magnesium hydroxide and carboxymethyl cellulose, continue ball milling 2 hours, add ball milling after Jojoba oil is heated to 30 ℃, cross 100 mesh sieves, obtain described compounded mix.

A kind of preparation method of low-temperature curable powder coating comprises the following steps:

Above-mentioned each raw material except white carbon black is mixed, send into high-speed mixer, 1000 rev/mins of dispersed with stirring 3-5 minute, send into forcing machine, melt extrude, then be placed in shredder, add white carbon black, speed lapping under 1200 r/min, the screen cloth that is 100 μ m after pore size, obtain described low-temperature curable powder coating.

Performance test:

Anti-solvent: 240 hours, unchanged;

Salt-fog test (1000h): unchanged.

Claims (2)

1. a low-temperature curable powder coating is characterized in that what it was comprised of the raw material of following weight parts:

Metaphenylene unsaturated polyester resin 50-60, E-12 epoxy resin 20-25, white carbon black 0.1-0.5, lanthanum trioxide 3.5-4.5, activity charcoal powder 10-13, Diisopropyl azodicarboxylate 1-2, water glass 2-3, ferrous sulfate 2-3, resol 1-2, dimethyl silicone oil 0.1-1, compounded mix 10-20;

Described compounded mix is comprised of the raw material of following weight parts:

Gibbsite 30-40, attapulgite 20-30, silicon carbide 6-10, magnesium hydroxide 3-5, carboxymethyl cellulose 1-2, Jojoba oil 2-3;

Above-mentioned gibbsite, attapulgite, silicon carbide are mixed, insulation calcining 2-4 hour under 600-800 ℃, send into after discharging is cooling in ball mill and carry out the ball milling mixing, add again magnesium hydroxide and carboxymethyl cellulose, continue ball milling 1-2 hour, add ball milling after Jojoba oil is heated to 25-30 ℃, cross the 80-100 mesh sieve, obtain described compounded mix.

2. the preparation method of a low-temperature curable powder coating as claimed in claim 1 is characterized in that comprising the following steps:

Above-mentioned each raw material except white carbon black is mixed, send into high-speed mixer, 800-1000 rev/min of dispersed with stirring 3-5 minute, send into forcing machine, melt extrude, then be placed in shredder, add white carbon black, speed lapping under 1000-1200 r/min, the screen cloth that is 80-100 μ m after pore size, obtain described low-temperature curable powder coating.