CN115260903B

CN115260903B - Organic silicon coating and preparation method and application thereof

Info

Publication number: CN115260903B
Application number: CN202211004598.2A
Authority: CN
Inventors: 孙能春; 杨庆彪
Original assignee: Hunan Sokan New Materials Co ltd
Current assignee: Matsui (Shanghai) New Materials Research Institute Co.,Ltd.
Priority date: 2022-08-22
Filing date: 2022-08-22
Publication date: 2023-04-07
Anticipated expiration: 2042-08-22
Also published as: CN115260903A

Abstract

The invention discloses an organic silicon coating and a preparation method and application thereof, belonging to the technical field of coatings, wherein the preparation raw material of the organic silicon coating comprises 40-70 parts by weight of methyl vinyl organic silicon polymer resin 1; 15-20 parts of methyl vinyl organic silicon polymer resin 2; 8-14 parts of hydrogen-containing silicone oil; 5-8 parts of polyurethane elastic particles; silicone blowing and foam breakers; the weight average molecular weight of the methyl vinyl organic silicon polymer resin 1 is 35-50 ten thousand; the weight average molecular weight of the methyl vinyl silicone polymer resin 2 is 5 to 10 ten thousand. The coating formed by the organic silicon coating provided by the invention has soft hand feeling, damping property and wear resistance. The invention also provides a preparation method and application of the organic silicon coating.

Description

Organic silicon coating and preparation method and application thereof

Technical Field

The invention relates to the technical field of coatings, in particular to an organic silicon coating and a preparation method and application thereof.

Background

With the development of science and technology, consumers have higher and higher requirements on the appearance of products such as 3C electronic products, intelligent wearing products, automobile interior trim and the like, and particularly, the products gradually abandon the pure plastic sense and tend to pursue the organosilicon coating material which is soft, smooth and good in skin-friendly sense. When the surface of the organic silicon coating material is coated with the organic silicon coating, the addition of the matte hand feeling coating formed by the organic silicon coating makes the product have fine, smooth and skin-friendly hand feeling and better experience feeling.

However, the combination of the above-mentioned silicone matte coatings for silicone substrate surfaces still has some drawbacks to be overcome, such as: for good hand feeling experience of products, a coating formed by the organosilicon coating generally has low surface tension and smooth feeling, so that the products are too smooth in the using process and have poor gripping and fitting feeling, and the products are damaged due to falling in the using and moving vibration processes; for another example, the coating formed by the silicone coating is abraded along with the increase of the service time, the smooth feeling of the coating is rapidly reduced, the luster of the product is increased, the hand feeling is unsmooth, dust and flock are easily adsorbed by static electricity, and the experience feeling is poor.

In order to solve the problems, researchers can emphatically improve the gloss of the coating, improve the surface tension of the coating, increase the roughness of the coating and other measures, reduce the hand feeling experience and the appearance performance of the coating formed by the organic silicon coating, and partially abandon the original purpose of the soft, fine and skin-friendly experience of the coating.

Therefore, a new organic silicon coating needs to be developed, and the characteristics of softness, fineness, good skin-friendly experience feeling and the like of most organic silicon coatings on the market at present, and the characteristics of damping feeling and wear resistance are needed.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides an organic silicon coating, and a coating formed by the organic silicon coating has smooth hand feeling, damping property and wear resistance.

The invention also provides a preparation method of the organic silicon coating.

The invention also provides application of the organic silicon coating.

According to an embodiment of the first aspect of the present invention, a silicone coating is provided, and the silicone coating is prepared from the following raw materials in parts by weight:

the weight average molecular weight of the methyl vinyl organic silicon polymer resin 1 is 35-50 ten thousand;

the weight average molecular weight of the methyl vinyl organic silicon polymer resin 2 is 5-10 ten thousand.

The silicone coating disclosed by the embodiment of the invention has at least the following beneficial effects:

(1) The methyl vinyl organic silicon polymer resin 1 and the methyl vinyl organic silicon polymer resin 2 adopted by the invention not only have the performance of common silica gel resin, but also can form uniform bubbles to be arranged on the surface of a product when the product forms a film under the action of a siloxane foaming agent, and larger and irregular bubbles in the bubbles are broken under the action of a foam breaker, and the remaining bubbles form stable hemispherical concave shapes on the surface, similar to a plurality of more regular suckers formed on the surface of a coating, and form certain adsorption capacity on the surface of a contact object, so that the damping performance of the coating formed by the organic silicon coating is improved, and the problem that the traditional organic silicon coating is too smooth is solved.

The coating formed by the organic silicon coating provided by the invention has hydrophobicity and a microscopically uneven surface, so that the water vapor can be prevented from forming a film on the surface of the coating, and the adsorption anti-skid effect on the surface of a product is finally effectively enhanced.

(2) In the invention, the weight average molecular weight of the methyl vinyl organic silicon resin 1 is 35-50 ten thousand, and when a large amount of filler and pigment are required to be added into the organic silicon coating, the methyl vinyl organic silicon resin 1 with the above dosage can also provide enough wrapping performance, and the problems of powder exposure, filler precipitation and the like can not occur.

The weight average molecular weight of the methyl vinyl organic silicon resin 2 is 5-10 ten thousand, and the methyl vinyl organic silicon resin 1 is matched, so that the surface of a coating formed by the organic silicon coating is fine and difficult to bloom after the two are coordinated in dosage.

Researches find that the methyl vinyl organic silicon resin 1 and the methyl vinyl organic silicon resin 2 both have excellent thixotropic property, when the materials are matched for use, the packing property of the obtained organic silicon coating to the filler can be further improved, the maximum addition amount of the solid filler can account for 30-40wt% of the organic silicon coating, various customized requirements are met, and the defect of single material color is overcome.

(3) When the polyurethane elastic particles are matched with other components for use, a coating formed by the obtained organic silicon coating has high wear resistance, namely after long-time use and wear, the smoothness, damping performance and adhesive force of the coating are still excellent.

According to some embodiments of the present invention, the weight average molecular weight of the methyl vinyl silicone polymer resin 1 is 40 to 50 ten thousand.

According to some embodiments of the present invention, the methyl vinyl silicone polymer resin 1 has a vinyl mass content of about 0.13 to about 0.17%.

Therefore, the organosilicon coating can be completely cured at the low temperature of 90-100 ℃, and deformation of an application substrate of the organosilicon coating caused by the temperature required by curing is avoided.

According to some embodiments of the present invention, the methyl vinyl silicone polymer resin 1 is a methyl vinyl silicone polymer resin having high thixotropy. Namely, under the pressurization condition, the silicone coating has good astringency resistance, and is helpful for improving the damping performance of the coating formed by the silicone coating.

According to some embodiments of the invention, the methyl vinyl silicone resin 1 is selected from one or several polymers of the TSJ3175 series of the japan meyer diagram.

According to some embodiments of the present invention, the methyl vinyl silicone resin 2 is selected from methyl vinyl MQ resins of Shenzhen Jipeng organofluoro new materials.

According to some embodiments of the invention, the hydrogen-containing silicone oil contains 1 to 2% by mass of hydrogen.

According to some embodiments of the present invention, the hydrogen-containing silicone oil is selected from at least one of shin KF99, toshiba TSF484, dow corning MHX-1107.

According to some embodiments of the invention, the polyurethane elastomer particles have a particle size of 7 to 8 μm.

According to some preferred embodiments of the present invention, when the methyl vinyl silicone polymer resin 1 is used in an amount of 40 to 70 parts, the silicone blowing agent is used in an amount of 1.0 to 1.5 parts.

It is further preferable that the amount of the silicone blowing agent is 1.2 to 1.7 parts when the amount of the methyl vinyl silicone polymer resin 1 is 40 to 70 parts.

According to some embodiments of the invention, the mass of the silicone blowing agent, as a percentage of the sum of the mass of the methyl vinyl silicone polymer resin 1 and the mass of the methyl vinyl silicone polymer resin 2, is from 1.5 to 2.0%.

According to some embodiments of the invention, the silicone blowing agent is selected from ES120 of the fossa chemical industry.

According to some preferred embodiments of the present invention, when the amount of the methyl vinyl silicone polymer resin 1 is 40 to 70 parts, the amount of the foam breaker is 0.8 to 1.2 parts.

According to some further preferred embodiments of the present invention, when the amount of the methyl vinyl silicone polymer resin 1 is 40 to 70 parts, the amount of the foam breaker is 0.7 to 0.9 part.

According to some embodiments of the invention, the mass of the foam breaker, as a percentage of the sum of the mass of the methyl vinyl silicone polymer resin 1 and the mass of the methyl vinyl silicone polymer resin 2, is from 0.8 to 1.2%.

According to some embodiments of the invention, the foam breaker is selected from the group consisting of hamming modesty fluorine modified 6800.

According to some embodiments of the present invention, the raw material for preparing the silicone coating further comprises at least one of a quaternary ammonium salt antistatic auxiliary, a silicone dispersant, an alkynol retarder, and a filler.

According to some embodiments of the present invention, when the methyl vinyl silicone polymer resin 1 is 40 to 70 parts by weight, the quaternary amine salt antistatic auxiliary agent is 0.8 to 1.2 parts by weight.

The amine salt antistatic auxiliary agent can reduce the activity of the coating formed by the organic silicon coating, so that the generation of coating static electricity is reduced, and the experience of consumers is finally improved.

According to some embodiments of the present invention, when the methyl vinyl silicone polymer resin 1 is 40 to 70 parts by weight, the polysilane dispersant is 0.5 to 2 parts by weight.

The polysilane dispersant has both dispersing and wetting functions, can be adsorbed on the surface of the filler on one hand, generates charge repulsion or steric hindrance, prevents the pigment and the filler from flocculation and sedimentation, and improves the dispersing performance of the filler in the organic silicon coating; on the other hand, the wetting property of the organic silicon coating to the applied substrate is improved; the storage stability of the obtained silicone coating can also be improved.

According to some embodiments of the invention, the polysilane dispersant may employ Mitigest A-1230.

According to some embodiments of the present invention, when the weight part of the methyl vinyl silicone polymer resin 1 is 40 to 70 parts, the weight part of the alkynol retarder is 0.5 to 2 parts.

According to some embodiments of the present invention, when the raw materials for preparing the silicone coating include the filler, the filler includes porous aerogel and hydrophobic silica.

Therefore, the filler has the functions of both the reinforcing agent and the filler, and the strength of the obtained coating can be improved while the coating formed by the organic silicon coating is reduced.

According to some embodiments of the present invention, when the weight part of the methyl vinyl silicone polymer resin 1 is 40 to 70 parts, the weight part of the porous aerogel is 1 to 3 parts.

According to some embodiments of the invention, the particle size of the porous aerogel is 6-8 μm.

The aerogel has a porous structure and the particle size, the porous aerogel adopted by the invention can replace the conventional fumed silica, and the addition amount is very small to achieve a better extinction effect (see the comparative table below), so that the pigment-base ratio of the formula is reduced, the water contact angle of the surface of the obtained coating is reduced, and the paint skid resistance is improved.

According to some embodiments of the invention, the porous aerogel is selected from the MT100 of cabot.

The surface of the porous aerogel has richer porous structures than the traditional silicon dioxide through a special process, and the structures enable the porous aerogel to have more excellent extinction capacity and surface arrangement.

According to some embodiments of the present invention, when the weight part of the methyl vinyl silicone polymer resin 1 is 40 to 70 parts, the weight part of the hydrophobic silica is 5 to 8 parts.

According to some embodiments of the invention, the raw materials for preparing the silicone coating further comprise a solvent.

According to some embodiments of the invention, the solvent comprises at least one of butyl acetate, odorless kerosene, and n-heptane.

Therefore, the organic solvents are all weak polar solvents, and the dispersibility of the organic silicon coating is improved.

According to some embodiments of the invention, the solvent comprises butyl acetate, odorless kerosene and n-heptane.

According to some embodiments of the present invention, when the weight part of the methyl vinyl silicone polymer resin 1 is 40 to 70 parts, the weight part of the solvent is 60 to 170 parts.

According to some preferred embodiments of the present invention, when the weight part of the methyl vinyl silicone polymer resin 1 is 40 to 70 parts, the weight part of the solvent is 60 to 80 parts, for example, about 68 parts.

According to some preferred embodiments of the present invention, the silicone coating is prepared from the following raw materials in parts by weight:

according to some embodiments of the invention, the substrate to which the silicone coating is applied comprises a silicone substrate.

According to some embodiments of the invention, the silicon-based substrate comprises an LSR substrate (injection molded liquid silicone rubber) having a shore hardness of 50-85 °.

According to some embodiments of the invention, the silicon-based substrate comprises a shore hardness of 70 to 75 °.

In the organic silicon coating, the film-forming substance, various auxiliaries and fillers interact with each other, so that a coating formed by the organic silicon coating has excellent touch feeling, wear resistance, damping feeling and adhesion with a base material. According to some embodiments of the invention, the silicone coating and the transition metal catalyst comprise a two-component coating.

Specifically, before construction, the silicone coating is mixed with a transition metal catalyst so that the latter initiates polymerization of the former; but in the storage phase, the two are stored separately so as to improve the storage stability of the two.

According to an embodiment of the second aspect of the invention, a preparation method of the organic silicon coating is provided, and the preparation method comprises the following steps:

s1, carrying out wet dispersion on the methyl vinyl organic silicon polymer resin 1, the methyl vinyl organic silicon polymer resin 2 and hydrogen-containing silicone oil;

s2, mixing the mixture obtained in the step S1 with the polyurethane elastic particles, and then mixing with the siloxane foaming agent;

and S3, mixing the mixture obtained in the step S2 with the foam breaker.

The mechanism of the preparation method is as follows:

the hydrogen-containing silicone oil can generate free radical addition reaction with methyl vinyl organic silicon polymer resin 1 or methyl vinyl organic silicon polymer resin 2 to form a network crosslinking structure (prepolymer), and then the prepolymer is mixed with other preparation raw materials to ensure that the obtained organic silicon coating obtains various excellent performances.

The preparation method provided by the embodiment of the invention has at least the following beneficial effects:

according to the preparation method provided by the invention, the synergistic effect of the preparation raw materials in the organic silicon coating can be more effectively exerted by adjusting the adding sequence of the materials, so that a coating formed by the organic silicon coating has multiple advantages of smooth hand feeling, high damping, high wear resistance and the like.

In addition, the preparation method provided by the invention is simple to operate and convenient for industrial implementation.

According to some embodiments of the invention, in the preparation method, step S1 further comprises adding a part of the alkynol retarder in the wet dispersion.

Preferably, the part of the alkynol retarder is about 40-60% of the total alkynol retarder. For example, it may be specifically about 50%.

According to some embodiments of the invention, the wet dispersion is accomplished with the aid of the solvent.

According to some embodiments of the invention, the wet dispersing further comprises adding a portion of the solvent to the mixture of methyl vinyl silicone polymer resin 1, methyl vinyl silicone polymer resin 2, hydrogen-containing silicone oil, and a portion of the acetylenic alcohol retarder with stirring.

Preferably, the portion of solvent is about 40-60% of the total amount of solvent. For example, it may be specifically about 50%.

According to some embodiments of the invention, in step S1, the wet dispersion is accomplished by means of stirring;

preferably, the stirring of the wet dispersion is carried out at the rotating speed of 600-800 rpm;

further preferably, the stirring time of the wet dispersion is 10-15min.

According to some embodiments of the invention, step S2 further comprises, before the mixing, mixing and stirring the mixture obtained in step S1 with the polysilane dispersant and the remaining alkynol retarder;

preferably, the rotation speed of the mixing and stirring is 600-800 rpm;

further preferably, the mixing and stirring time is 5-8 min.

Therefore, the dispersibility of subsequently added polyurethane elastomer particles and other preparation raw materials can be improved, the reaction degree of the preparation raw materials of the organosilicon coating is effectively controlled, and the film-forming performance is prevented from losing before the organosilicon coating is constructed.

According to some embodiments of the invention, in step S2, the mixing further comprises mixing with the filler.

Preferably, the mixing with the filler is carried out at 500 to 700rpm (low speed stirring). Therefore, the sufficient infiltration and the coating of film-forming substances such as the methyl vinyl organic silicon polymer resin 1, the methyl vinyl organic silicon polymer resin 2, hydrogen-containing silicone oil and the like on the polyurethane elastic particles and the filler can be ensured, and the dispersion uniformity of the obtained organic silicon coating is finally improved.

According to some embodiments of the invention, in step S2, the mixing further comprises adding 40-70% of the remaining solvent. For example, specifically, it may be about 50%; i.e. in particular may be 25% of the total solvent content.

Thereby avoiding the problems of too high viscosity and uneven dispersion caused by the addition of a large amount of filler and the polyurethane elastomer particles.

According to some embodiments of the invention, in step S2, the mixing is performed under stirring;

preferably, the rotation speed of the stirring used for mixing in the step S2 is 1000-2000rpm; for example, about 1200rpm may be specific.

Preferably, the mixing time period in the step S2 is 10-15min.

According to some embodiments of the invention, the mixing with the silicone blowing agent in step S2 is performed under stirring;

preferably, the agitation used to mix with the silicone blowing agent is at about 1200rpm; further preferably, the required time period is about 10min.

According to some embodiments of the invention, the preparation method further comprises mixing and stirring the mixture obtained in step S2 and the quaternary ammonium salt antistatic auxiliary agent between step S2 and step S3;

preferably, the rotating speed of mixing and stirring with the quaternary ammonium salt antistatic auxiliary agent is 800-1000 rpm; further preferably, the time period for mixing and stirring with the quaternary amine salt antistatic auxiliary agent is about 10min.

According to some embodiments of the present invention, the viscosity of the mixture obtained by the preparation method before step S3 is 30000-50000 mpa-S (test temperature is 40-45 ℃).

According to some embodiments of the invention, step S3 further comprises grinding the mixture obtained in step S2 and adding the remaining solvent before mixing with the foam breaker.

Preferably, the grinding times are more than or equal to 3 times.

Further preferably, after the grinding, the particle fineness of the mixture is less than or equal to 10 μm.

According to some preferred embodiments of the present invention, the preparation method comprises the steps of:

D1. mixing the methyl vinyl organic silicon polymer resin 1, the methyl vinyl organic silicon polymer resin 2, hydrogen-containing silicone oil and alkynol retarder (accounting for 50 percent of the total amount), adding a solvent accounting for 50 percent of the total weight of the solvent, and stirring at the rotating speed of 600-800rpm for 10-15min to carry out wet dispersion;

D2. maintaining the stirring rotation speed of 600-800rpm, sequentially adding the silane dispersing and residual alkynol retarder into the mixture obtained in the step D1, and then mixing and stirring for 5-8min at the rotation speed of 600-800 rpm;

D3. maintaining the stirring speed at 600-800rpm, and adding the polyurethane elastic particles, the porous aerogel and the hydrophobic white carbon black into the mixture obtained in the step D2; and solvent (25% of the total amount) was added simultaneously; then, the stirring speed is increased to 2000rpm, and the stirring is carried out for 10min;

D4. maintaining the stirring rotation speed of the step D3, adding the siloxane foaming agent into the mixture obtained in the step D3, reducing the stirring rotation speed to 1200rpm, and continuing stirring for about 10min;

D5. adjusting the stirring speed to 800-1000rpm, adding the quaternary ammonium salt antistatic agent into the mixture obtained in the step D4, continuously stirring at the speed of 800-1000rpm for 10min, and detecting the viscosity of the obtained mixture at the temperature of less than 60 ℃ to be 30000-50000mpa & s;

D6. d, grinding the mixture obtained in the step D5 by three rollers for 3 times, wherein the fineness of solid particles in the obtained mixture is less than or equal to 10 mu m;

D7. adding the rest solvent and the foam breaker into the mixture obtained in the step D6; then stirring at the rotating speed of 800-1000rpm for 10min.

In the preparation method, the addition sequence of the preparation raw materials, the stirring speed of each step and the stirring duration are regulated and controlled, so that the obtained organic silicon coating is high in uniform dispersion degree, the pre-polymerization reaction of the film forming material is moderate in degree, and the application operability of the obtained organic silicon coating can be improved.

According to the third aspect of the embodiment of the invention, a coating is provided, and the raw material for preparing the coating comprises the organic silicon coating.

All the technical schemes of the organic silicon coating in the embodiment are adopted in the coating, so that the coating at least has all the beneficial effects brought by the technical schemes of the embodiment. The obtained coating has high adhesive force with a base material, the coating has smooth hand feeling and high damping performance, and most importantly, the wear resistance of the coating is excellent.

According to some embodiments of the present invention, the coating layer is applied by mixing the silicone coating material, the diluent and the transition metal catalyst and then coating the mixture on the substrate.

According to some embodiments of the invention, the method of coating comprises at least one of spraying, brushing and flow coating.

According to some embodiments of the invention, the transition metal catalyst is present in an amount of 2 to 4% by weight based on the total weight of the silicone coating. For example, the weight of the transition metal catalyst may be 3% of the total weight of the silicone coating.

According to some embodiments of the invention, the diluent is present in an amount of 2 to 4 times the amount of the silicone coating, for example about 3 times.

According to some embodiments of the invention, after the silicone coating, diluent, and transition metal catalyst are mixed, the resulting mixture has a viscosity of 9.0-9.5 seconds for a saltern # 2 cup.

According to some embodiments of the invention, the transition metal catalyst is a complex of platinum. The transition metal catalyst can improve the hydrogen addition reaction speed and the crosslinking degree of the methyl vinyl organic silicon polymer resin (1 and 2) and the hydrogen-containing silicone oil, reduce the reaction temperature, effectively inhibit side reaction in the crosslinking reaction process, avoid the generation of black substances, and overcome the phenomenon that the obtained coating is yellow or black when other types of transition metal catalysts are used.

Because the transition metal catalyst has high activity, in order to prevent the crosslinking reaction of the organic silicon coating composition at normal temperature and improve the construction operability of the obtained organic silicon coating, the alkynol retarder needs to be added into the organic silicon coating so as to prolong the construction operable time of the organic silicon coating; and with the temperature rise, the alkynol retarder can be disabled, the activity of the transition metal catalyst is deblocked, and the high-efficiency thermal catalysis effect is achieved.

According to some embodiments of the invention, the transition metal catalyst is selected from CAT-PL-56, japan.

According to a fourth aspect of the present invention, there is provided a vehicle comprising the coating.

The vehicle adopts all the technical solutions of the coatings in the above embodiments, so that the vehicle has at least all the advantages brought by the technical solutions of the above embodiments. That is, in the vehicle, the experience of the passengers is more excellent.

According to an embodiment of the fifth aspect of the invention, an electronic related product is proposed, which comprises the coating.

Since all the technical solutions of the coatings in the above embodiments are adopted in the electronic related products, at least all the advantages brought by the technical solutions of the above embodiments are achieved. Specifically, the electronic related product has soft, exquisite and good skin-friendly experience sense in the using process, the adhesive force of the coating on the electronic related product is high, static electricity generation is reduced as much as possible in the using process, and long initial hand feeling retention is provided; the problems that electronic related products easily slide and shift in the using and moving processes are solved, and the using experience of consumers is improved in all directions.

According to some embodiments of the invention, the electronic related product comprises at least one of an earphone, a digital book protection frame, a mobile phone holder, a tablet computer holder, a wireless charger, a vehicle-mounted holder, and an automobile storage shelf.

Unless otherwise specified, "about" in the present invention means an allowable error of ± 2%, for example, about 100 actually means 100 ± 2% × 100.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic view showing a structural change of a silicone coating in a test example of the present invention.

Detailed Description

The concept and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments to fully understand the objects, features and effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention.

Unless otherwise stated, the information of the preparation raw materials in the specific embodiment is as follows:

methyl vinyl silicone resin 1: TSJ3175 selected from the japanese mei plot;

methyl vinyl silicone resin 2: the methyl vinyl MQ resin is selected from Shenzhen Jipeng organic fluorine new materials.

The hydrogen-containing silicone oil is selected from TSF484 of Toshiba japonica.

The siloxane foaming agent is selected from ES120 of Foshan Ochmus chemical industry;

the foam breaker can be modified with fluorine 6800 of Hamming modesty.

The transition metal catalyst is Pt complex, and the model is CAT-PL-56 of Japan Beacon.

The alkynol retarder is selected from methylpentylalkynol (CAS: 77-75-8).

The polysilane dispersant is selected from Mylar SILQUEST A-1230;

the porous aerogel adopts MT100 of cabot.

Hydrophobic white carbon black is selected from watt' s

H13L。

K500 of Doxono powder and C803 of Grace are both commercially available products.

Example 1

The embodiment prepares the organic silicon coating, and the specific steps are as follows:

D1. mixing methyl vinyl organic silicon polymer resin 1, methyl vinyl organic silicon polymer resin 2, hydrogen-containing silicone oil and alkynol retarder (accounting for 50 percent of the total amount), adding solvent accounting for 50 percent of the total weight of the solvent, and stirring at the rotating speed of 800rpm for 15min for wet dispersion;

D2. maintaining the stirring speed at 800rpm, sequentially adding the polysiloxane dispersion and the residual alkynol retarder into the mixture obtained in the step D1, and then mixing and stirring for 8min at the speed of 800rpm;

D3. maintaining the stirring speed at 800rpm, and adding polyurethane elastic particles, porous aerogel and hydrophobic white carbon black into the mixture obtained in the step D2; and solvent (25% of the total amount) was added simultaneously; then, the stirring speed is increased to 2000rpm, and stirring is carried out for 10min;

D4. maintaining the stirring rotation speed of the step D3, adding a siloxane foaming agent into the mixture obtained in the step D3, reducing the stirring rotation speed to 1200rpm, and continuing stirring for about 10min;

D5. adjusting the stirring speed to 1000rpm, adding the quaternary ammonium salt antistatic agent into the mixture obtained in the step D4, continuing stirring at the speed of 1000rpm for 10min, and detecting the viscosity of the obtained mixture at 40-45 ℃ to be 30000-50000 mpa-s (within the range, the performance of the obtained organic silicon coating is hardly influenced);

D6. grinding the mixture obtained in the step D5 by three rollers for 3 times, wherein the fineness of solid particles in the obtained mixture is less than or equal to 10 mu m;

D7. adding the rest solvent and the foam breaker into the mixture obtained in the step D6; then stirred at 1000rpm for 10min.

The preparation starting materials used in this example are shown in Table 1.

Example 2 and comparative examples 1 to 2 were each prepared as a silicone coating, and were different from example 1 in the preparation raw material combinations, and the specific preparation raw materials and the amounts thereof are shown in table 1.

TABLE 1 preparation of raw materials (parts by weight) for examples 1 to 2 and comparative examples 1 to 2

Comparative example 3

This comparative example prepared an organosilicon coating, which differs from example 1 specifically in that:

(1) The preparation raw materials are different, and specific preparation raw materials are shown in table 2; the method comprises the following specific steps

(2) The preparation steps are different, and the specific steps are as follows:

A1. mixing methyl vinyl organic silicon polymer resin 1, hydrogen-containing silicone oil and alkynol retarder (accounting for 50 percent of the total amount), adding solvent accounting for 50 percent of the total weight of the solvent, and stirring at the rotating speed of 800rpm for 15min for wet dispersion;

D2. maintaining the stirring speed at 800rpm, sequentially adding the polysilane dispersant and the residual alkynol retarder into the mixture obtained in the step D1, and then mixing and stirring for 8min at the speed of 800rpm;

D3. maintaining the stirring speed at 800rpm, and adding polyurethane elastic particles and hydrophobic white carbon black into the mixture obtained in the step D2; and solvent (25% of the total amount) was added simultaneously; then, the stirring speed is increased to 1200rpm, and stirring is carried out for 10min;

D4. maintaining the stirring rotation speed of the step D3, gradually adding matting powder into the mixture obtained in the step D3, keeping the stirring rotation speed at 1200rpm, and continuing stirring for about 10min; and detecting the viscosity of the obtained mixture at 45-50 ℃ to be 35000-50000mpa & s;

D5. grinding the mixture obtained in the step D4 by three rollers for 3 times, wherein the fineness of solid particles in the obtained mixture is less than or equal to 10 mu m;

D6. the remaining solvent was added to the mixture obtained in step D5, followed by stirring at 1000rpm for 10min.

TABLE 2 preparative materials (parts by weight) used in comparative example 1

Test example

The first aspect of the present test example was conducted to test the matting ability of the porous aerogel MT100 and the matting powder commonly used in the industry used in the examples. Wherein the contact angle test method is a metering optical contact angle analysis method; the gloss was measured with the aid of a gloss meter.

The test results are shown in table 3.

TABLE 3 comparison of the Properties of the cellular aerogel used in the examples of the invention and of the customary matting agents

In table 1, the addition amount is in mass percent of the resin; except that the corresponding matting agent is used to replace the MT110, the other components of the test system are the same as those in example 1, that is, only the matting agent to be tested is included in the test system, for example, when the MT100 is tested, the white carbon black in the original example 1 is not added.

From the results shown in table 3, it can be seen that: compared with other extinction powder, the porous aerogel adopted by the invention is more suitable for the organic silicon coating system provided by the invention, namely, under the condition of the same using amount, the organic silicon coating system can obtain equivalent hydrophobic effect and lower glossiness, so that the organic silicon coating obtained by the invention can obtain better hand feeling and damping effect.

In the second aspect of this test example, the performance of the silicone coating obtained in examples 1 to 2 and comparative examples 1 to 3 was tested by the following specific test methods:

the organosilicon coating, the solvent and the platinum catalyst obtained in each embodiment are mixed according to the weight ratio of 100:300:3, construction is carried out after mixing, and after mixing, the viscosity of the obtained organic silicon coating is 9.0-9.5s for No. 2 cup of a salt pan;

the mixed organic silicon coating is sprayed on a silica gel substrate (the Shore hardness of the substrate is A70-85 degrees, the substrate is black), the spraying thickness is 12-14um (the thicknesses of coatings obtained at different positions are not completely the same), and the gloss range 60-degree angle of the obtained coating is in the range of 0.5-0.8 degrees (the test of 10 point positions is carried out, and the range value of the statistical test is carried out). Drying after the spraying is finished, wherein the baking condition is 100 ℃/60min. The schematic diagram of the spraying and drying processes of the organosilicon coating is shown in fig. 1, namely, in the spraying process, bubbles are formed under the action of a foaming agent, and in the drying process, partial bubbles are broken under the action of a foam breaker to form a concave shape, which is beneficial to improving the damping effect of the obtained coating.

The coating obtained after drying is subjected to appearance test, adhesion test, wear resistance test, boiling test, xenon lamp aging test, cold and hot impact test and salt spray test, and the test method comprises the following steps:

and (3) appearance testing: visual and tactile tests show that a paint film is uniform and flat, has fine and smooth hand feeling (the angle of black material is 0.5-0.8 degree/60 degree, the test is carried out by referring to the standard provided by GB/T1743-1979), and is qualified when strong resistance and astringency are generated, otherwise, the paint film is unqualified.

And (3) testing the adhesive force: the test was carried out according to the method provided in GB/T9286-2021.

And (3) salt spray testing: after the neutral salt spray is continuously sprayed for a certain time, the surface condition of the coating is observed and the adhesive force is tested.

Boiling test: soaking in water at 85 deg.C for 120min, observing the surface condition of the coating and testing the adhesion.

Xenon lamp aging test: ultraviolet light wavelength of 420nm and light intensity of 0.80W/m ² And after the coating is stored for a certain time under the condition, the appearance and the adhesive force of the coating are observed to be not less than 5B.

And (3) testing cold and hot impact: and (3) after the coating is stored at the temperature of minus 40 ℃ for 12h, the coating is stored at the temperature of 80 ℃ for 12h, the cycle is 10 in total, and the surface condition of the coating is observed and the adhesion is tested.

And (3) denim abrasion resistance test: the adopted denim is of a type of levis 501; testing by adopting a wear-resistant testing instrument; in the test process, the diameter of a pressure head is phi 10mm (four layers of denim are fixed at one end of the pressure head (the thickest surface faces outwards), the denim is vertically moved downwards, leftwards and rightwards and is rubbed on the surface of a tested product, a weight is added at the other end of the pressure head to ensure that the denim is integrally attached to 1kgf, the one-way displacement of the pressure head on the surface of the tested product is about 50mm, the moving speed is 60mm/s (counting once in a reciprocating mode), and after the specified times are more than or equal to 1500, the coating is not damaged, exposed materials are OK (qualified), and otherwise, the coating is NG (unqualified).

Martindale abrasion test: a special Martindel test device is adopted, the load is 1000g, the friction times are more than or equal to 6000 times (one time in one reciprocating circle) as the test standard, the state of a paint film is observed, no damage and no exposed materials are OK (qualified), and otherwise, the state is NG (unqualified).

Moving slide distance test: the silicone coatings obtained in the examples and the comparative examples are sprayed on the surface of a plane material, which is 20cm long and 15cm wide and is wrapped by PC, of the LSR, the surface roughness of the coating is detected after the silicone coating is dried (the detection shows that the COF dynamic friction value US of the coating formed by the silicone coating obtained in the examples of the invention is 0.25-0.3 and the static friction value UK is 0.3-0.35), and the obtained flat plate material is placed on a fixed frame, and the angle of the flat plate material is adjusted to be the inclination angle of 15 degrees. Then, a test product (the surface properties of the test product and the surface properties of the flat material are the same) weighing about 200-230g was placed in the middle of the test fixture for a timing test. The flat plate material was the coating formed in the second aspect of this test example in order to examine the effect of the coating formed from the silicone coating obtained in accordance with the invention on the prevention of slipping (8 h sliding distance should be < 1.5cm for ok).

The test results of the above tests are shown in table 4.

TABLE 4 Properties of coatings formed from the silicone coatings obtained in examples 1 to 2 and comparative examples 1 to 3

Combining the results of table 4 with the technical effect of conventional silicone coatings, one can see that: the water contact angle of the organic silicon coating formed by the traditional organic silicon resin is very high and is usually more than 115 degrees under the condition of low gloss, and the organic silicon coating has smooth hand feeling. The desire to lower the water contact angle, increase the damping feel of the coating can only be achieved by increasing the gloss. Often resulting in poor experience of the finished product and easy adsorption of dust and impurities.

The formula of the organic silicon coating comprises methyl vinyl organic silicon polymer resin 1 with high molecular weight and thixotropy, the resin has good thixotropy and certain self-extinction performance (matched with a siloxane foaming agent and a foam breaker), and if the same glossiness effect as that of the traditional organic silicon coating is achieved, the organic silicon coating system provided by the invention can obviously reduce the using amount of fillers such as extinction powder. And the water contact angle is obviously reduced (the surface tension of the coating is improved) under the condition of low gloss due to the formation of the coating with a special structure. And the resin has stronger wrapping effect on fillers such as extinction powder, pigment and the like, so that the amount of the fillers contained in the organic silicon coating can be obviously increased, and a coating with good appearance effect can be obtained. Because of the matching use of the methyl vinyl organic silicon polymer resin 1 and the methyl vinyl organic silicon polymer resin 2, the compactness of the obtained coating is improved, and the chemical resistance and the friction resistance are improved; furthermore, the resin, the hydrogen-containing siloxane and the polyurethane elastic particles are matched with each other, so that the adhesive force and the wear resistance of the obtained coating are obviously improved. Finally, due to the mutual matching of the preparation raw materials, a coating formed by the obtained organic silicon coating has good damping feeling and use experience effect, the defects that the traditional hand-feeling coating is slippery and easy to deviate in use can be well overcome, and the excellent physical properties such as adhesive force and the like are considered.

In table 4, as can be seen from the results of examples 1 to 2 and comparative example 3, compared with the conventional silicone coating, the silicone coating provided by the present invention has the advantages that the damping performance of the silicone coating is improved on the basis of maintaining the properties of the conventional silicone coating in various aspects such as hand feeling, adhesion, abrasion resistance, etc., and the disadvantages that the conventional silicone coating has slippery hand feeling and is easy to deviate in use are overcome.

In table 4, it is understood from the results of examples 1 to 2 and comparative example 1 that, if the content of the methyl vinyl silicone polymer resin 2 is not within the range required by the present invention, the coating formed therefrom is less dense due to no synergistic effect with the methyl vinyl silicone polymer resin 1, and thus the abrasion resistance is not satisfactory. And because the content ratio of the film forming material is low, the coating property of the coating to the porous aerogel and the like is poor, and the appearance of the obtained coating has the defect of flowering. Also, since the film-forming material is not added in a proportion within the range required by the present invention, the damping effect of the resulting coating is not satisfactory.

In table 4, comparing the results of examples 1 to 2 with those of comparative example 2, it can be seen that if the content of the methyl vinyl silicone polymer resin 2 is out of the range required by the present invention, the crosslink density in the formed coating is lower than that of examples 1 to 2, resulting in a direct result of inferior abrasion resistance. And after the dosage of the preparation raw materials is changed, the damping performance is also reduced to a certain degree.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. Furthermore, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.

Claims

1. The organic silicon coating is characterized in that the preparation raw materials of the organic silicon coating comprise the following components in parts by weight:

the weight molecular weight of the methyl vinyl organic silicon polymer resin 1 is 35-50 ten thousand;

the weight average molecular weight of the methyl vinyl organic silicon polymer resin 2 is 5-10 ten thousand;

the organic silicon coating is prepared by a preparation method comprising the following steps of:

and S3, mixing the mixture obtained in the step S2 with the foam breaker.

2. The silicone coating according to claim 1, wherein the silicone blowing agent is present in an amount of 1.5 to 2.0% by mass based on the sum of the mass of the methyl vinyl silicone polymer resin 1 and the mass of the methyl vinyl silicone polymer resin 2.

3. The silicone coating according to claim 1, wherein the percentage of the mass of the foam breaker to the sum of the mass of the methyl vinyl silicone polymer resin 1 and the mass of the methyl vinyl silicone polymer resin 2 is 0.8 to 1.2%.

4. The silicone coating according to any one of claims 1 to 3, wherein the silicone coating is prepared from a raw material further comprising at least one of a quaternary ammonium salt antistatic auxiliary, a polysilane dispersant, an alkynol retarder, and a filler.

5. The silicone coating according to claim 4, wherein when the raw materials for the preparation of the silicone coating include the filler, the filler includes a porous aerogel and a hydrophobic silica.

6. The silicone coating according to any one of claims 1 to 3, characterized in that the raw materials for the preparation of the silicone coating further comprise a solvent.

7. A coating layer, characterized in that a raw material for preparation comprises the silicone coating material as set forth in any one of claims 1 to 6.

8. A vehicle comprising a coating according to claim 7.

9. An electronic related product comprising the coating of claim 7.