阅读说明：本技术 一种防粘漆涂料及其制备方法和应用 (Anti-adhesion paint and preparation method and application thereof ) 是由 顾明远 汤大炜 台明 于 2020-06-12 设计创作，主要内容包括：本发明属于喷涂技术领域,具体公开了一种防粘漆涂料及其制备方法和应用,由以下质量百分比的原料组成：聚乙烯蜡乳液40-60％,聚氨酯分散体25-35％,色浆1-3％,成膜助剂2-10％,消泡剂0-1％,流平剂0-1％,分散剂0-1％,增稠剂0-2％,本发明的防粘漆涂料喷涂于挂具成膜后乙烯蜡颗粒会浮到涂层表面,由于蜡的低表面张力,其表面很难附着,油漆和涂料在上面的附着力很差,很容易清理。(The invention belongs to the technical field of spraying, and particularly discloses an anti-sticking paint and a preparation method and application thereof, wherein the anti-sticking paint comprises the following raw materials in percentage by mass: 40-60% of polyethylene wax emulsion, 25-35% of polyurethane dispersion, 1-3% of color paste, 2-10% of film forming additive, 0-1% of defoaming agent, 0-1% of flatting agent, 0-1% of dispersing agent and 0-2% of thickening agent.)

1. The anti-sticking paint is characterized by comprising the following raw materials in percentage by mass: 40-60% of polyethylene wax emulsion, 25-35% of polyurethane dispersion, 1-3% of color paste, 2-10% of film-forming additive, 0-1% of defoaming agent, 0-1% of flatting agent, 0-1% of dispersing agent, 0-2% of thickening agent and water.

2. A release paint coating according to claim 1, characterized in that the particle size of the polyurethane dispersion is below 50 nm.

3. The anti-adhesion paint coating as claimed in claim 1, wherein the polyurethane dispersion is a carbon nanotube doped modified polyurethane aqueous dispersion.

4. The anti-sticking paint coating as claimed in claim 3, which is characterized by comprising the following raw materials in percentage by mass: 50% of polyethylene wax emulsion, 30% of carbon nanotube doped modified polyurethane aqueous dispersion, 2.5% of color paste, 6% of film-forming additive, 0.5% of defoaming agent, 0.8% of flatting agent, 0.2% of dispersing agent, 1% of thickening agent and the balance of water.

5. The preparation method of any one of the anti-adhesion paint coatings according to claims 1 to 4, characterized in that the materials are sequentially stirred at normal temperature for half an hour at 1500r/min according to the sequence of the proportion from large to small, the viscosity is adjusted to be 20 to 40s for Zean #3, and the density is 1.05 to 1.1g/cm³。

6. The use of the anti-adhesion paint prepared by the method of claim 4, wherein the coating thickness is 20-50 μm by brushing or spraying directly on a hanger.

7. The use of the anti-adhesion paint coating according to claim 5, wherein the hanger painting thickness is 30 μm when the workpiece is electrostatically painted.

Technical Field

The invention belongs to the technical field of spraying, and particularly relates to an anti-sticking paint and a preparation method and application thereof.

Background

The generalized hangers include hangers, hooks, brackets, baskets, and the like. For electrostatic coating of paint and powder, a workpiece is attached to a hanger to finish pretreatment, spraying and curing. The hanger is a carrier for coating workpieces and is indispensable in coating production. The effect of the hanger is several:

the coating of the hanger is thick, the electric conduction is poor, the thin electrostatic spraying of the workpiece coating requires that the receiving resistance of the workpiece is less than 1 MOmega, otherwise, the powder cannot be adsorbed on the workpiece or the adsorption thickness is insufficient, and the coating is thin after curing; for liquid paints, poorly conducting workpieces result in poor droplet directionality and failure to achieve process thickness within the spray time.

The way to overcome the defect is to clean the hanging points and the whole hanger if necessary; the effect is also good by using a method of connecting wires. The cleaning of the hanging points is a daily maintenance work, and tools such as pliers, a grinding machine and the like are used for cleaning simply and quickly until the metal base body of the hanging tool is exposed. The hanging points are good in conductivity and capable of meeting the requirement of spraying, but when the whole is thick, the hanging tool is clumsy, and the whole is required to be demoulded. The method for removing the plastic comprises the following three steps: the efficiency is low and the effect is poor due to manual beating; the coating is soaked in a solvent, the plastic is removed completely, the speed is high, but the solvent contains volatile components and halogenated hydrocarbon, and an ideal method is not provided for treating the swelling and falling coating; the thermal cleaning furnace is treated by a burning method, the spraying hanger is placed in the thermal cleaning furnace with the temperature of 400-600 ℃ for burning for 4-6 hours, the spraying hanger is taken out of the thermal cleaning furnace after being cooled, the coating with the surface pulverized is cleaned by a high-pressure water gun, the organic components in the coating are decomposed by utilizing high temperature, and the products are harmless gas and solid, so that the method is a common treatment process at present. This treatment process has the following disadvantages:

however, the magnetic hanger loses magnetism at high temperature, and high-temperature plastic removal is avoided. The grounding of the hanger is poor, the coating thickness is influenced, electric sparks can be generated under high voltage, the electrostatic spray painting with solvent volatilization is more harmful, and the hanger is a great potential safety hazard. The conductive capacity of the hanger is increased through design, the plastic removal is needed in time, and the iron rust and the paint skin on the surface of the hanger fall off to cause impurity particles on the surface of the coating after the paint (plastic) removal.

To maintain the conductivity of the hanger, the hanger is periodically de-molded. No matter what kind of demolding method, the demolding hanger has residual oxide skin and paint skin and thus has impurity quality. Therefore, a hanger processing method is urgently needed to solve the problem that the workpiece is damaged due to improper handling of the hanger in the spraying process of the workpiece.

Disclosure of Invention

The invention mainly aims to provide an anti-sticking paint and a preparation method and application thereof, so as to solve the problems existing in the use process of a hanger in the background technology.

In order to achieve the above purpose, the invention provides the following specific scheme:

an anti-sticking paint coating comprises the following raw materials in percentage by mass: 40-60% of polyethylene wax emulsion, 25-35% of polyurethane dispersion, 1-3% of color paste, 2-10% of film-forming additive, 0-1% of defoaming agent, 0-1% of leveling agent, 0-1% of dispersing agent and 0-2% of thickening agent. The polyethylene wax emulsion has the advantages of acid resistance, alkali resistance, hard water resistance, strong water solubility, stable emulsion, no delamination after being diluted by water in any proportion, no emulsion breaking, no agglomeration, long shelf life, high solid content and good dispersibility, and has good performances of scratch resistance, water resistance, adhesion resistance, pollution resistance, wear resistance, softness, surface lubrication and the like

Further, the particle size of the polyurethane dispersion is below 50 nm. Compared with the common polyurethane dispersoid, the modified aqueous polyurethane resin dispersoid has more and more superior characteristics, such as good flexibility, water resistance and fatigue resistance, the granularity of the modified aqueous polyurethane resin dispersoid is less than 50 nanometers, the adhesive film has high strength, high glossiness, no yellowing, good adhesive force, clear and transparent film formation, soft hand feeling, high fullness and good bonding performance with non-polar materials.

Further, the polyurethane dispersion is a carbon nanotube doped modified polyurethane aqueous dispersion. The carbon nano tube has surface effect, volume effect, quantum size effect and the like due to the special structural hierarchy, and the carbon nano tube-based organic/inorganic composite material has better thermodynamic performance than the traditional composite material, so that the technology of the carbon nano tube modified polyurethane aqueous dispersion coating is relatively mature in recent years, the carbon nano tube doping degree of the carbon nano tube modified polyurethane aqueous dispersion used by the invention is 0.12%, and the S.D. distribution of the aqueous polyurethane dispersion is widened due to the addition of the carbon nano tube. The emulsion viscosity is increased along with the increase of the doping amount of the carbon nano tubes, the heat resistance of the aqueous polyurethane coating film can be improved by doping modification of the carbon nano tubes, and the initial and maximum weight loss temperatures of the polyurethane coating film with the doping amount of 0.1 percent of the carbon nano tubes are correspondingly increased by about 20 ℃. The doping modification of the carbon nano tube can obviously improve the basic performances such as hardness, water resistance and the like of the aqueous polyurethane coating, after the good performance of the polyurethane dispersion modified by the carbon nano tube is improved to be combined with the polyethylene wax emulsion, in the process of coating a workpiece, the hanger is used for a long time, and when the lamination is thick, the hanger needs to be combined when the coating cannot be cleaned, and when the hanger is burnt, because of the excellent heat resistance of the carbon nano tube doping modified polyurethane aqueous dispersion, wax on the surface can be melted at a relatively low temperature during burning, the powder layer is cleaned, the hanger is not damaged, and the phenomenon that iron rust and paint coats on the surface of the hanger fall off to cause impurity particles on the surface of the coating after paint (plastic) removal is avoided.

Preferably, the paint comprises, by mass, 50% of a polyethylene wax emulsion, 30% of a carbon nanotube-doped modified polyurethane aqueous dispersion, 2.5% of a color paste, 6% of a film-forming aid, 0.5% of a defoaming agent, 0.8% of a leveling agent, 0.2% of a dispersing agent, 1% of a thickening agent, and the balance water.

Further, the invention provides a preparation method of the anti-sticking paint, which comprises the steps of stirring the materials at normal temperature for half an hour at 1500r/min in sequence from large to small, adjusting the viscosity to be 20-40s for Chuanyn #3 and adjusting the density to be 1.05-1.1g/cm³。

Furthermore, the invention provides an application method of the anti-sticking paint, which is to directly coat the anti-sticking paint on a hanger by brushing or spraying and the like, wherein the brushing thickness is 20-50 mu m.

Preferably, when the workpiece is electrostatically sprayed, the coating thickness is 30 μm. The spray painting hanger comprises a hanging structure, a hanging needle and a hanging rod for connecting the hanging structure and the hanging needle. For powder electrostatic coating, a workpiece is attached to a hanger to finish pretreatment, spraying and curing. The hanger is used as the most commonly used tool in the production process of spraying plastics and coating, when the hanger is in a working state, the whole hanger is a conductor, and the hangers on the hanging needle and other objects to be sprayed with plastics are all conductive, so that the final electrostatic powder spraying is particularly realized, the coating of the hanger is thick and poor in conductivity, the coating of a workpiece is thin, the receiving resistance of the workpiece is required to be less than 1 MOmega when the coating of the workpiece is thin and the electrostatic spraying is required to be less than 1 MOmega, otherwise, the powder cannot be adsorbed on the workpiece or the adsorption thickness is insufficient, and the coating is thin after the powder is solidified; for liquid paint, the poor conductivity of the workpiece leads the liquid drop to have poor directionality, and the technical thickness can not be reached within the spraying time, so when the coating thickness of the anti-sticking paint coating is 30 mu m, the conductivity of the hanger meets the requirement of electrostatic spraying of the workpiece, and the electrostatic spraying efficiency is greatly improved.

The invention has the advantages that after film forming, the ethylene wax particles can float to the surface of the coating, the surface of the coating is difficult to adhere due to the low surface tension of the wax, the adhesion force of the paint and the coating on the surface is poor, and the coating is easy to clean.

The product is designed to be used for coating the surfaces of the hanging tool and the perforated strainer of a paint spray booth, after the product is used, the paint or the coating on the surfaces of the hanging tool and the perforated strainer is easy to clean, high temperature or incineration treatment is not needed, the production efficiency can be improved, and the generation of hazardous wastes is reduced.

The polyurethane dispersoid used in the invention is the polyurethane dispersoid added with the carbon nano tube doped modified polyurethane aqueous dispersoid, has excellent heat resistance, is used by combining with polyethylene wax emulsion and is modified by adding the carbon nano tube, when a workpiece is coated, the hanger is used for a long time, the lamination is thicker, and the combination is needed under the condition that the coating cannot be cleaned, when in incineration treatment, the carbon nano tube doped modified polyurethane aqueous dispersoid has excellent heat resistance, can melt the wax on the surface at relatively low temperature when in incineration, cleans a powder layer, does not damage the hanger, and avoids the surface of the hanger from rust and paint skin falling off to cause impurity particles on the surface of a coating after paint (plastic) removal.

Detailed Description

Hereinafter, specific embodiments of the present invention will be described in detail. To avoid unnecessary detail, the following examples will not describe the known art in detail. Unless defined otherwise, technical and scientific terms used in the following examples have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

The test reagent consumables used in the following examples are all conventional biochemical reagents unless otherwise specified; the experimental methods are conventional methods unless otherwise specified; in the following examples,% is by mass unless otherwise specified.