CN1796475A - Wearable powder coating of thermosetting silver powder - Google Patents

Abstract

This invention describes a thermosetting, abrasion-resisting powdered silver painting with high strength, hardness and scratch resistance, which is composed of 25-35 portions of polyester resin, 2-3 portions of isocyanuric acid glycidic ester, 5-10 portions of BaSO4, 2-4 portions of lightweight CaCO3, 0.5-1 portions of rutile-type titanium oxide and 1.5-3.5 portions of aluminum powders, which are mixed and molten extruded to produce the powdered painting. The powdered painting can be sprayed on the metal backings through electrostatic spraying. The resulting painting layer has good scratch resistance, abrasion resistance, weather resistance and impact resistance, which can provide good protection for a wide variety of metal backings. After a first time of spraying, the painting layer has the aesthetic feeling of metallic silver powders, and doesn't need a second time of spraying of transparent powders, thus broadening the application scope of powdered painting from indoors to outdoors.

Description

Wearable powder coating of thermosetting silver powder

Technical field

The present invention relates to a kind of coating, be specifically related to a kind of powder coating, exactly is a kind of wearable powder coating of thermosetting silver powder.

Background technology

Powder coating is a kind ofly not contain organic solvent, also water-free pulverulent solids coating, and with the Powdered surface that is sprayed at coated article, through the coating of fusion levelling, film-forming.

In the prescription of powder coating, add pigment, be intended to make painted, the generation decorative effect of filming.Add metallic aluminium powder, have plenty of, the same high-gloss metal effect of chromium plating is arranged in order to obtain highly reflective filming.As " Shanghai coating " 2000.3 disclosed " development of chromium plating type powder coating ", in thermosetting powder coating(s), add 3～4% aluminium powder, coating film gloss 〉=140 (%).This aluminium powder be particle diameter less (10～15um) floating type aluminium powder, can floating (migration) when film-forming to the surface orientation of filming, evenly distributed, generation is as the reflective chromium plating effect of the height of " aluminium flake ".But this intensity of filming, hardness and anti-zoned property are lower.

CN1352221A discloses a kind of non-corrosive metal (NCM) powder coating, and host by 70～95% and 5～30% tackiness agent are formed.The metal-powder that host mainly is made up of aluminium powder and zinc powder, aluminium powder account for 1～25% of metal-powder, promptly account for 7～24% of whole dry film, but the cost of this coating is higher.

Summary of the invention

Technical problem to be solved by this invention provides a kind of intensity, hardness and anti-zoned property height, the wearable powder coating of thermosetting silver powder that cost is low

The present invention adds the thicker un-suspension powdered aluminium of particle diameter in the prescription of thermosetting powder coating(s), be intended to obtain wear resistance, good the filming of weather resisteant energy.This powder coating comprises vibrin, solidifying agent, filler and aluminium powder, it is characterized in that, each component has following parts by weight:

25～35 parts in vibrin

2～3 parts of triglycidyl isocyanurates

BaSO ₄5～10 parts

Lightweight CaCO ₃2～4 parts

0.5～1 part of rutile titanium dioxide

1.5～3.5 parts of aluminium powders

Described aluminium powder is a un-suspension powdered aluminium.

In above-mentioned composition, can also add 2～5 parts of flow agents 505.In addition according to the specification sheets of used pigment and user requirement, add an amount of iron orchid, high pigment such as black to color.

With vibrin and solidifying agent triglycidyl isocyanurate (TGIC) and filler BaSO ₄, lightweight CaCO ₃And rutile titanium dioxide (TiO ₂) mix behind the batching, through melt extruding the postcooling section, add aluminium powder then and pulverize together and mix, promptly get wearable powder coating of thermosetting silver powder.

The present invention has the many advantages of powder coating institute inherent, and after making the silver powder wear-resistant paint and once spraying, has both had the silver powder effect, need not to spray once more transparent powder again.The weather resisteant that it is good, oxidation-resistance and wear resistance have been expanded powder coating greatly by indoor range of application to the open air, and the cost of coating is lower simultaneously.This powder coating can be widely used in the application and the protection of metal material surfaces such as various aluminium section bars, family expenses five metals, sanitary ware, automotive hub, motorway isolation guardrail, body-building apparatus.

Embodiment

Non-limiting examples of the present invention is described below:

Vibrin is end carboxyl saturated polyester resin, and concrete quality index is as follows: outward appearance: light yellow sheet or fine particulate.Acid number (mgKOH/g): 22～45,, second-order transition temperature: 〉=62 ℃, softening temperature (ring and ball method) ℃: 100～120.

Triglycidyl isocyanurate (TGIC), concrete quality index is as follows: outward appearance: white powder, oxirane value (mol/100g): 〉=0.9, fusing point (℃): 〉=85, viscosity (100 ℃)＜100cp, chloride total amount (mol/100g) :≤0.04.

BaSO ₄Concrete quality index is as follows: effective component content (%) 〉=98, pH value: 7.0-9.0, whiteness (%) 〉=95.0, oil number (%) 15～25, fineness (30um screenings) % :≤0.05.

Light calcium carbonate, concrete quality index is as follows: effective component content (%) 〉=95, whiteness (%) 〉=90.0, moisture content and fugitive constituent (%)≤0.7, oil number (%) 40～60, pH value: 7.6-9.8.

Rutile titanium dioxide (TiO ₂), concrete quality index is as follows: outward appearance: white powder, content of titanium dioxide (%, m/m): 〉=94, the aqeous suspension pH value: 6.5～8.0, screenings (%, 45um sieve aperture) :≤0.05, opacifying power (g/m ²) :≤20, water regain (%)≤28.

Aluminium powder is non-floating type flaky aluminum pigment, the coated with silica thing, and concrete quality index is as follows: purity (%)＞99.5, grain thickness :≤0.2um.

Flow agent 505 is functional monomer and acrylic copolymer, and concrete quality index is as follows: outward appearance is oyster white or light yellow solid particle, solids content (%)＞99, and softening temperature (ring and ball method) ℃: 90～110, acid number (mgKOH/g): 30～55.

1, gets 25 parts in vibrin, 2 parts of solidifying agent TGIC, BaSO ₄5 parts, 2 parts of light calcium carbonates, 0.5 part of rutile titanium dioxide, blue 0.01 part of iron drops into rotation and mixes from turning in the formula mixing machine, melt extrude through mixing extruder then, the cooling back adds 1.5 parts of aluminium powders by the slicing machine section, pulverizes at last, mix and promptly get wearable powder coating of thermosetting silver powder, appearance luster is even, loose nothing caking, fineness (0.09mm square hole sieve) screen over-size≤0.3%.

2, get 35 parts in vibrin, 3 parts of solidifying agent TGIC, BaSO ₄10 parts, 4 parts of light calcium carbonates, 1 part of rutile titanium dioxide, 3.5 parts of aluminium powders, processing is with embodiment 1.

Powder coating, appearance luster is even, loose nothing caking, fineness (0.09mm square hole sieve) screen over-size≤0.3%.

3, get 30 parts in vibrin, 2.5 parts of solidifying agent TGIC, BaSO ₄7 parts, 3 parts of light calcium carbonates, 0.75 part of rutile titanium dioxide, 2.5 parts of aluminium powders, high black 0.01 part, processing is with embodiment 1.

4, can add 2.5 parts of flow agents 505 in example 1～3 and mix, melt extrude with vibrin, operation is with embodiment 1 later on.

With the tinplate is base material, and at 180 ℃ ± 2 ℃ fusions, curing 7～15min, obtaining thickness is that 60～70um films with the foregoing description 1-4.The coating main performance index is as follows: range estimation paint film appearance: smooth, smooth; Pencil hardness (scratch) (GB/T 6793-1996): 5H; Gloss (60 °) (GB/T 9754-88): 97; Shock strength (N.cm) is (GB/T1732-93): 392; Snappiness (mm) (GB/T 1731-93) 1; Acid resistance (immersing 3%HCl solution 240h) (GB/T 9274-88 first method) no change.

Above-mentioned proof, this powder coating have remarkable mechanical property, especially anti-zoned property, and wear resistance and shock resistance can provide excellent protection to all kinds of metal bases.

The applicant tests the weather resisteant of above-mentioned coating, and the result is as follows:

12 months no powder phenomenon-tions of outdoor exposure, salt spray resistance, each 1000h no change of heatproof heat are immersed in 5% hydrochloric acid, 5%NaOH and the gasoline 240 hours no changes.

Claims (2)

1, a kind of wearable powder coating of thermosetting silver powder contains vibrin, triglycidyl isocyanurate, BaSO ₄, lightweight CaCO ₃, rutile titanium dioxide, aluminium powder is characterized in that: each component has following parts by weight:

25～35 parts in vibrin

2～3 parts of triglycidyl isocyanurates

BaSO ₄5～10 parts

Lightweight CaCO ₃2～4 parts

0.5～1 part of rutile titanium dioxide

1.5～3.5 parts of aluminium powders

2, powder coating according to claim 1 is characterized in that: can also add 2～5 parts of flow agents 505 in the composition.