CN112646476A

CN112646476A - Super-wear-resistant thin-coating antistatic coating and preparation method thereof

Info

Publication number: CN112646476A
Application number: CN202011416364.XA
Authority: CN
Inventors: 杨国光
Original assignee: Coelan Building Material Maanshan Co ltd
Current assignee: Coelan Building Material Maanshan Co ltd
Priority date: 2020-12-07
Filing date: 2020-12-07
Publication date: 2021-04-13

Abstract

The invention discloses an ultra-wear-resistant thin-coating antistatic coating and a preparation method thereof, belonging to the technical field of coatings. The coating comprises a component A, a component B and a component C, wherein an NCO group-containing curing agent, hydroxyl-containing polyether and moisture in the air are subjected to crosslinking reaction, two crosslinking reaction products are formed in a coating film, and the coating film belongs to an interpenetrating hybrid polymer and has high crosslinking density, high hardness and ultrahigh wear resistance; in addition, the formula contains conductive components, so that the antistatic function can be achieved, and the white corundum powder particles of the component C can increase the wear resistance and improve the anti-skid property; finally, the function of ultra-wear-resistant thin coating antistatic is obtained, the production equipment is simple, complex equipment does not need to be purchased, the cost is saved, the production process is easy to operate, and the cost of manual experience in the production process is reduced.

Description

Super-wear-resistant thin-coating antistatic coating and preparation method thereof

Technical Field

The invention belongs to the field of coatings, and particularly relates to an ultra-wear-resistant thin-coating antistatic coating and a preparation method thereof.

Background

With the progress of modern science and technology and the development of industry, especially the rapid development of high-end fine electronic industry, the static problem becomes a problem which needs more and more attention in the development of electronic industry, and also becomes a great threat to the quality of human working and living environment. The development of the antistatic coating is also one of important factors influencing the environment, and the antistatic coating is coated on the surface of an object and can be well bonded with a base material to form a complete and compact film layer, so that the base material is protected, and a specific antistatic function is realized. The coating materials can be roughly classified into water-based coating materials, high-solid coating materials and powder coating materials according to their forms, and the coating materials are selected according to the problems to be specifically solved because of the difference in properties between the coating materials of different forms.

The purpose of static electricity prevention is as follows: for an electronic product production workshop, the ESD (electrostatic discharge) damage phenomenon of static electricity generated due to various reasons in the production process to an ESDS (electrostatic discharge sensitive) device is reduced as much as possible, the yield of electronic products is improved, ESD is completely avoided being impossible, and only the ESD phenomenon can be reduced; for EPA (antistatic working area), for example: a maintenance room for electronic products, a detection laboratory, etc. The purpose is to avoid ESD phenomenon as much as possible in the maintenance or detection process of the ESDS device due to the non-standard of the maintenance or detection instrument, and damage to the ESDS device; for the petrochemical industry, the flammable and combustible places, the electrostatic ignition phenomenon is avoided to the greatest extent so as to avoid exploding combustible gas which is volatilized into the air, casualty accidents, property loss and the like.

The coating is used in an anti-static working area, can greatly solve the static hazard in the environment and optimize the working environment, the existing coating products with super-wear-resistant thin coating anti-static in the market are relatively few, the application of the coating products has certain limitation, the existing anti-static coating products are mainly applied to the ground in buildings, such as electronic factory workshops, electronic element detection rooms, military electronic part storage rooms and the like, and the coating film has the anti-static function. For example, chinese patent CN03816920.7 discloses an antistatic coating material comprising conductive metal oxide fine particles, a binder resin and an organic solvent, wherein the concentration of the solid content is 1 to 20 wt%, the content of the conductive metal oxide fine particles in the solid content is 50 to 80 wt%, the average particle diameter of the conductive metal oxide fine particles is 100nm or less, and the content of particles having a particle diameter of 200nm or more is 10 wt% or less. Further, as disclosed in chinese patent CN201510485310.1, an antistatic coating is prepared from modified poly (3, 4-ethylenedioxythiophene) -polystyrene sulfonic acid, aromatic urethane acrylate, silicone resin, dimethylaminoethyl acrylate, a diluent, a leveling agent, graphene, magnesium chloride, nano silver powder, and organobentonite.

When the paint is used for the ground, the unit area dosage is large, the thickness is large, the gloss is high, the gloss is a negative factor for the working environment, the emotional psychology of operators is influenced, and therefore, the physical performance of the paint is required to be higher. The improvement of the physical properties of the coating and the prevention of static electricity are topics worth of further discussion.

Disclosure of Invention

1. Problems to be solved

Aiming at the problems of static accumulation in the production, storage, inspection and use environments of various existing fine electronic products, the invention provides a thin-coating antistatic coating with the functions of matte, solvent-free, skid resistance, super wear resistance and the like, wherein the selected hydroxyl-containing polyether is subjected to crosslinking reaction with an NCO curing agent, and NCO groups are simultaneously subjected to reaction with moisture in the air; in addition, the kaolin in the formula can improve the smoothness of a coating and enhance the wear resistance; the conductive component is special superfine conductive paste (nano-scale size), has permanent conductivity and can discharge static accumulation; finally forming the multifunctional antistatic coating.

The invention also aims to provide a preparation method of the super-wear-resistant thin-coating antistatic coating, which has the advantages of simple production equipment, no need of purchasing complex equipment, cost saving, easy operation in the production process and reduction of the manual experience cost in the production process.

2. Technical scheme

In order to solve the problems, the technical scheme adopted by the invention is as follows:

the super wear-resistant thin-coating antistatic coating comprises a component A, a component B and a component C;

the component A comprises a curing agent, and the curing agent contains NCO groups;

the component B comprises hydroxyl-containing polyether: 10-40 parts of green environment-friendly solvent: 5-8 parts of superfine kaolin: 10-25 parts of auxiliary agent: 0-3 parts (excluding 0 part) and conductive paste: 20-30 parts of a solvent;

the component C is white corundum powder particles with the particle size of 160-200 meshes.

It should be noted that: hydroxyl in the hydroxyl-containing polyether and moisture in the air react with NCO groups to generate a polyurethane material, and the polyurethane material can improve the strength of the coating and improve the wear resistance of the coating: the specific reason is that the hydroxyl-containing polyether and the water in the air react with NCO groups to generate a medium molecular weight polymer, the gloss of a coating film is not high and is close to matte, and because the two reactions are carried out simultaneously in the process, the crosslinking density of a product formed by the reaction is high, a hybrid polymer is formed, and the super wear-resistant function is realized; meanwhile, the kaolin has strong corrosion resistance, so that the coating can better resist the corrosion of chemical media, has good integrity after coating, has certain extinction property, small particle size and good dispersibility, can avoid the coating from caking in the storage process, and ensures the normal use of the coating.

In a preferred embodiment of the present invention, the hydroxyl group content of the hydroxyl group-containing polyether is 5 to 10% by mass. The further hydroxyl-containing polyether may be a trihydroxy polyether, a tetrahydroxy polyether or an octahydroxy polyether, preferably a trihydroxy polyether.

In the selection process of hydroxyl polyether, hydroxyl directly reacts with NCO groups, so that polyether with proper hydroxyl content needs to be selected, and if the hydroxyl content of the selected polyether is too low, the crosslinking density is low, and the film strength is low; if the hydroxyl content is too high, the crosslinking density is high, the film strength is high, the flexibility is reduced, and the usability of the coating is not facilitated; meanwhile, the reactivity of hydroxyl is considered, the activity is too high, the reaction time after the ingredients is too short, and the construction cannot be carried out; the activity is too low, and the paint is not cured for a long time after construction and roller coating, so that the normal use of the ground is influenced.

As a preferable scheme of the invention, the component B also comprises an antifoaming agent in parts by weight: 0-0.3 parts (excluding 0 part), leveling agent: 0-0.3 parts (excluding 0 part) and wetting dispersant: 0 to 0.5 part (excluding 0 part). The defoaming agent can reduce the surface tension in the coating, inhibit the generation of foam or eliminate the generated foam, and avoid the influence on the stirring effect caused by a large amount of foam in the stirring process. The leveling agent can enable the coating to form a flat, smooth and uniform coating film in the process of drying and film forming, and the consistency of the coating effect of the coating is enhanced. The wetting dispersant has stronger wetting and dispersing capability and enhances the uniform property of the coating.

As a preferable scheme of the invention, the component B also comprises titanium dioxide in parts by weight: 5-10 parts of color paste: 30-50 parts (excluding 0 part). The titanium dioxide is used as a pigment in the paint and is matched with the color paste for use, if the titanium dioxide is not added, the paint is colorless and transparent, if the paint needs to be toned, the titanium dioxide is added as a dye substrate, and then the corresponding color paste is added for toning. In addition, titanium dioxide contains a small amount of ferrous sulfate (in a proportion of about 0.2 mass%), and the inventors have found through a large number of experiments that: the ferrous ions in the solution can promote the reaction of hydroxyl and NCO groups, thereby shortening the stirring time.

In a preferred embodiment of the present invention, the solvent in the component B is a DBE high-boiling point solvent (the high-boiling point solvent mixed dibasic acid ester (DBE is called by dupont) is a dibasic acid ester mixture), and the solvent is odorless. And the component A: and B component: and C component is 5: 2: 3, matched detection is carried out, and the VOC index reaches the VOC volatilization standard of a solvent-free floor coating material in the national standard GB22374-2018 floor coating material. The odorless environment-friendly solvent is mainly used in the construction process, so that the influence of the strong odor on the construction is reduced, and the volatilization stability of the solvent is ensured due to the high boiling point.

In a preferred embodiment of the present invention, the curing agent is an HDI isocyanate curing agent or an alternative. The HDI isocyanate curing agent is an NCO group-containing curing agent, and can well react with hydroxyl-containing polyether and moisture in air.

The invention also provides a preparation method of the super-wear-resistant thin-coating antistatic coating, which comprises the following steps:

step S101, adding hydroxyl-containing polyether, DBE solvent, defoaming agent, flatting agent and wetting dispersant into a stirring dispersion machine, uniformly stirring in the stirring dispersion machine at 800 rpm for 3-8 minutes to form a uniform mixture;

s102, adding titanium dioxide and superfine kaolin into a stirring disperser while stirring, stirring at 1500 rpm for 12-18 minutes until the granularity of the mixture is less than or equal to 50 micrometers;

step S103, adding the conductive paste into the stirring disperser while stirring, stirring at 1500 rpm for 15-20 minutes,

step S104, adding color paste to the standard card according to the requirement for color mixing to prepare a mixture with uniform color, stirring uniformly and filtering to obtain a component B;

step S105, mixing the component A: and B component: and C component is 5: 2: 3, and uniformly stirring to obtain the ultra-wear-resistant thin-coating antistatic coating.

The product is mainly applied to electronic factory workshops, can also be used for grounds such as electronic device test rooms, storerooms and the like, can bear slight load for a long time, and achieves the effects of super wear resistance, thin coating and static electricity prevention.

3. Advantageous effects

Compared with the prior art, the invention has the beneficial effects that:

(1) according to the super-wear-resistant thin-coating antistatic coating, the hydroxyl-containing polyether and water in the air are subjected to crosslinking reaction with an NCO curing agent to generate a polyurethane material, and the polyurethane material can improve the strength of a coating and improve the wear resistance of the coating; the hydroxyl-containing polyether, moisture and NCO groups react to generate a medium molecular weight polymer, the gloss of a coating film is not high and is close to matte, and because the two reactions are carried out simultaneously in the process, the crosslinking density of a product formed by the reactions is very high, a hybrid polymer is formed, and the super wear-resistant function is realized; meanwhile, the kaolin has strong corrosion resistance, so that the coating can better resist the corrosion of chemical media, has good integrity after coating, is not easy to separate, has certain extinction property, small particle size and good dispersibility, and can prevent the coating from caking in the storage process to influence the normal use;

(2) the ultra-wear-resistant thin-coating antistatic coating has the advantages that the raw material types of the coating components are few, the components are simple and easy to obtain, and the coating components can be adjusted to meet different customer requirements;

(3) the super-wear-resistant thin-coating antistatic coating has the advantages of simple production equipment, no need of purchasing complex equipment, cost saving, easy operation of the production process and reduction of the cost of manual experience in the production process.

Drawings

The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and examples, but it should be understood that these drawings are designed for illustrative purposes only and thus do not limit the scope of the present invention. Furthermore, unless otherwise indicated, the drawings are intended to be illustrative of the structural configurations described herein and are not necessarily drawn to scale.

FIG. 1 is an electron transfer equation between a hydroxyl-containing polyether and a curing agent containing NCO groups;

FIG. 2 is a static test chart of the ultra-wear-resistant thin-coating antistatic coating.

Detailed Description

The following detailed description of exemplary embodiments of the invention refers to the accompanying drawings, which form a part hereof, and in which is shown by way of illustration exemplary embodiments in which the invention may be practiced. Although these exemplary embodiments are described in sufficient detail to enable those skilled in the art to practice the invention, it should be understood that other embodiments may be realized and that various changes to the invention may be made without departing from the spirit and scope of the present invention. The following more detailed description of the embodiments of the invention is not intended to limit the scope of the invention, as claimed, but is presented for purposes of illustration only and not limitation to describe the features and characteristics of the invention, to set forth the best mode of carrying out the invention, and to sufficiently enable one skilled in the art to practice the invention. Accordingly, the scope of the invention is to be limited only by the following claims.

The experimental procedures used in the following examples are conventional unless otherwise specified.

Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.

The super wear-resistant thin-coating antistatic coating comprises a component A, a component B and a component C, wherein the component B is shown in the following table 1 in parts by weight:

TABLE 1 ultra wear-resistant thin-coating antistatic coating B component and parts

The hydroxyl content of the hydroxyl-containing polyether is 5-10% by mass, as shown in figure 1, the electron transfer equation of the hydroxyl-containing polyether and NCO group for reaction to generate polyurethane is shown, the hydroxyl functional group needs polyether with certain weather resistance, medium molecular weight and slightly low reaction activity, and the polyether does not contain solvent.

The superfine kaolin has strong corrosion resistance, so that the coating can better resist the corrosion of chemical media, has good integrity after coating, is not easy to separate, has certain extinction property, small particle size and good dispersibility, can avoid the caking of the coating in the storage process, and ensures the normal use of the coating.

In addition, the auxiliary agents include defoamers: 0 to 0.3 parts (excluding 0 part), leveling agent: 0-0.3 parts (excluding 0 part) and wetting dispersant: 0-0.5 parts (excluding 0 part), the defoamer may be polydimethylsiloxane or an alternative; the wetting dispersant can be alkylhydroxylammonium salt of block copolymer containing acidic groups or cationic guar gum, wherein the cationic guar gum can inhibit the hydrolysis of ferrous ions in the titanium dioxide, and avoid the precipitation caused by colloid; the leveling agent can be fluorocarbon modified acrylic ester or substitute, and the defoaming agent, the leveling agent and the wetting dispersant are products of Germany Picker chemistry, American Dow Corning chemistry or domestic Tiger chemistry, China company and the like.

Example 1

The component B of the super wear-resistant thin-coating antistatic coating is shown in Table 1, the component A is an HDI isocyanate curing agent, the component C is 160-mesh white corundum powder particles, and the component A, the component B and the component C are prepared according to the weight ratio of 5: 2: 3, mixing to form the coating.

The preparation method of the ultra-wear-resistant thin-coating antistatic coating comprises the following steps:

adding trihydroxy polyether, DBE solvent, polydimethylsiloxane, fluorocarbon modified acrylate and cationic guar gum into a stirring dispersion machine, uniformly stirring in the stirring dispersion machine at 800 rpm for 3 minutes to form a uniform mixture;

adding titanium dioxide and superfine kaolin into a stirring disperser while stirring, stirring at 1500 rpm for 12 minutes until the granularity of the mixture is less than or equal to 50 microns;

thirdly, adding the conductive paste into the stirring dispersion machine while stirring, and stirring for 15 minutes at 1500 rpm;

fourthly, according to the requirements, color paste is added into the standard card for color mixing to prepare a mixture with uniform color, and the mixture is stirred uniformly and filtered to obtain a component B;

fifthly, mixing the component A: and B component: and C component is 5: 2: 3, mixing and stirring uniformly.

Example 2

The component B of the super wear-resistant thin-coating antistatic coating is shown in Table 1, the component A is an HDI isocyanate curing agent, the component C is white corundum powder particles of 200 meshes, and the component A, the component B and the component C are prepared according to the proportion of 5: 2: 3, mixing to form the coating.

adding trihydroxy polyether, DBE solvent, polydimethylsiloxane, fluorocarbon modified acrylate and alkyl hydroxyl ammonium salt of block copolymer containing acidic groups into a stirring dispersion machine, uniformly stirring in the stirring dispersion machine at 800 rpm for 8 minutes to form a uniform mixture;

adding titanium dioxide and superfine nano kaolin into a stirring disperser while stirring, stirring at 1500 rpm for 18 minutes until the granularity of the mixture is less than or equal to 50 microns;

thirdly, adding the conductive paste into the stirring dispersion machine while stirring, and stirring for 20 minutes at 1500 rpm;

fifthly, mixing the component A: and B component: and C component is 5: 2: 3, and uniformly stirring.

Example 3

The component B of the super wear-resistant thin-coating antistatic coating is shown in Table 1, the component A is an HDI isocyanate curing agent, the component C is 180-mesh white corundum powder particles, and the component A, the component B and the component C are prepared according to the weight ratio of 5: 2: 3, mixing to form the coating.

adding trihydroxy polyether, DBE solvent, polydimethylsiloxane, fluorocarbon modified acrylate and alkyl hydroxyl ammonium salt of block copolymer containing acidic groups into a stirring dispersion machine, uniformly stirring in the stirring dispersion machine at 800 rpm for 6 minutes to form a uniform mixture;

adding titanium dioxide and kaolin into a stirring disperser while stirring, stirring for 15 minutes at 1500 rpm until the granularity of the mixture is less than or equal to 50 microns;

Example 4

adding trihydroxy polyether, DBE solvent, polydimethylsiloxane, fluorocarbon modified acrylate and alkyl hydroxyl ammonium salt of block copolymer containing acidic groups into a stirring dispersion machine, uniformly stirring in the stirring dispersion machine at 800 rpm for 5 minutes to form a uniform mixture;

adding titanium dioxide and kaolin into a stirring disperser while stirring, stirring at 1500 rpm for 16 minutes until the granularity of the mixture is less than or equal to 50 microns;

thirdly, adding the dispersing slurry of the single-walled carbon nano tube into the stirring dispersing machine while stirring, and stirring for 20 minutes at 1500 rpm;

Example 5

adding trihydroxy polyether, DBE solvent, polydimethylsiloxane, fluorocarbon modified acrylate and alkyl hydroxyl ammonium salt of block copolymer containing acidic groups into a stirring dispersion machine, uniformly stirring in the stirring dispersion machine at 800 rpm for 3 minutes to form a uniform mixture;

adding titanium dioxide and kaolin into a stirring disperser while stirring, stirring at 1500 rpm for 18 minutes until the granularity of the mixture is less than or equal to 50 microns;

Example 6

The component B of the super-abrasion-resistant thin-coating antistatic coating is shown in Table 1, the component A is an MDI isocyanate curing agent, the component C is 160-mesh white corundum powder particles, and the ratio of the component A, the component B and the component C is 5: 2: 3, mixing to form the coating.

thirdly, adding the conductive paste into the stirring dispersion machine while stirring, and stirring for 18 minutes at 1500 rpm;

Comparative example 1

This comparative example is substantially identical to example 6, except that: titanium dioxide is not added.

15 parts of superfine kaolin (5 parts of the superfine kaolin substitute titanium dioxide) is added into the stirring disperser while stirring, the stirring is carried out at 1500 rpm for 25 minutes until the granularity of the mixture is less than or equal to 50 microns;

thirdly, adding the conductive paste into the stirring dispersion machine while stirring, stirring for 18 minutes at 1500 rpm,

Compared with example 6, the stirring time is relatively prolonged under the same particle size requirement, and the fact that the titanium dioxide contains a small amount of ferrous sulfate (the proportion is about 0.2 mass percent) is proved, wherein the ferrous ions can promote the reaction of hydroxyl and NCO groups, so that the stirring time is shortened. The basic performance of the super wear-resistant thin-coating antistatic coating obtained in the embodiment is detected according to the enterprise standard, and the detection result is shown in table 2:

TABLE 2 basic performance test results of ultra-wear-resistant thin-coating antistatic coating

By combining the performance parameters, the applicant carries out systematic detection and analysis on the ultra-wear-resistant thin-coating anti-static coating and the coating for the electronic component factory, and the analysis of the figure 2 shows that the coating not only keeps the specific performance of the conventional anti-static coating, but also increases the unique performances of ultra-wear resistance, matte property, stable resistance, lasting and effective anti-static property and reaches the solvent-free VOC standard. The material has wide adjustability in various properties, and has good flexibility and certain hardness.

Claims

1. The super wear-resistant thin-coating antistatic coating is characterized by comprising a component A, a component B and a component C;

the component B comprises hydroxyl-containing polyether: 10-40 parts of solvent: 5-8 parts of superfine kaolin: 10-25 parts of auxiliary agent: 0-3 parts (excluding 0 part) and conductive paste: 20-30 parts of a solvent;

the component C is white corundum powder particles with the particle size of 160-200 meshes;

according to the weight part ratio, the component A comprises the following components: and B component: and C component is 5: 2: 3, the hydroxyl content of the hydroxyl-containing polyether is 5-10% by mass percent.

2. The ultra-wear-resistant thin-coating antistatic coating material as claimed in claim 1, wherein the auxiliary agent comprises an antifoaming agent, a leveling agent and a wetting dispersant, and the antifoaming agent comprises the following components in parts by weight: 0-0.3 parts (excluding 0 part), leveling agent: 0-0.3 parts (excluding 0 part) and wetting dispersant: 0 to 0.5 part (excluding 0 part).

3. The super wear-resistant thin-coating antistatic coating material as claimed in claim 2, wherein the curing agent in the A component is an HDI isocyanate curing agent; the solvent in the component B is DBE solvent.

4. The ultra-wear-resistant thin-coating antistatic coating as claimed in claim 3, wherein the component B further comprises titanium dioxide in parts by weight: 5-10 parts; color paste: 30-50 parts.

5. The ultra-abrasion resistant thin-coat antistatic coating material as claimed in claim 4, wherein the defoaming agent is polydimethylsiloxane; the wetting dispersant is alkylhydroxy ammonium salt of block copolymer containing acidic group; the flatting agent is fluorocarbon modified acrylic ester.

6. The ultra-wear thin-coating antistatic coating of claim 5, wherein the conductive paste is a dispersed paste of single-walled carbon nanotubes.

7. The ultra-abrasion-resistant thin-coat antistatic coating material as claimed in claim 6, wherein the hydroxyl-containing polyether is trihydroxy polyether.

8. A method for preparing the ultra-wear-resistant thin-coating antistatic coating as claimed in claim 7, which is characterized by comprising the following steps:

step S103, adding the conductive paste into a stirring disperser while stirring, stirring at 1500 rpm for 15-20 minutes,

step S105, mixing the component A curing agent, the component B and the white corundum powder particles of the component C according to the weight part ratio of 5: 2: 3, and uniformly stirring to obtain the ultra-wear-resistant thin-coating antistatic coating.