CN114316764A - Barrier coating, preparation method thereof and method for coating barrier coating - Google Patents
Barrier coating, preparation method thereof and method for coating barrier coating Download PDFInfo
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Abstract
The invention provides a barrier coating, a preparation method thereof and a method for coating the barrier coating, wherein the barrier coating comprises a component A and a component B, and the component A comprises an isocyanate component, a first auxiliary agent and a first solvent; the mass ratio of the isocyanate component to the first auxiliary agent to the first solvent is 100: (0-100): (0 to 100); in the component B, the mass ratio of the amino compound, the defoaming agent, the aluminum powder, the second auxiliary agent and the second solvent is 100: (0.5-1): (2-7): (0-31): (100 to 131); the isocyanate component comprises at least one of diphenylmethane diisocyanate and hexamethylene diisocyanate trimer; the amino compound comprises polyaspartic acid; the mass ratio of the component A to the component B is 1-1.5: 1. the barrier coating is coated on the surface of a rubber product to form the barrier coating, so that the odor of the rubber product can be directly blocked.
Description
Technical Field
The invention belongs to the technical field of materials, and particularly relates to a barrier coating, a preparation method thereof and a method for coating the barrier coating.
Background
With the gradual maturity of the automobile market in China, consumers have higher requirements on the performance, quality and safety of the automobile products. However, consumers have a higher demand for the interior odor state of the vehicle in addition to satisfying their demands for the vehicle performance. The odor in the car mainly comes from two sources: firstly, the odor from the parts such as seats, instrument panels, carpets and the like in the passenger compartment is diffused; the second is the odor emission from the interior trim and rubber products in the luggage compartment. With the gradual upgrade of materials in the automobile and the continuous enhancement of the management and control of the odor of parts in an automobile host factory, the odor of parts in a passenger compartment represented by parts such as seats, instrument panels, carpets and the like is effectively managed and controlled. As the odor status in the passenger compartment is continuously optimized, the user complaints about the odor in the passenger compartment are gradually reduced. Odor problems of rubber articles, such as tires, in the luggage compartment area are gradually rising out of the water. The odor condition of the interior parts of the luggage compartment is optimized through optimization and control of materials and processes, so that the reduction of the rubber odor emission of rubber products in the luggage compartment is the key for improving the odor condition in the luggage compartment.
The reduction of odor emission of rubber products can be started from three aspects, the first is to optimize the formula of the rubber products and select the low-odor rubber formula, but the formula of the rubber products is relatively stable based on the safety performance requirements of the rubber products. For example, the raw materials for spare tires are selected from Ethylene Propylene Diene Monomer (EPDM) systems, and even with the selection of low odor rubber formulations, the odor and comfort requirements of the consumer in the luggage compartment area are still not met.
Secondly, the storage and the storage period of the rubber products are prolonged, so that the rubber products are ventilated for 1-4 weeks to disperse the odor, and the intensity of the odor of the rubber is reduced. However, the prolonged inventory of rubber products results in a large amount of inventory resources being occupied, which imposes a cost pressure on the host plant. Meanwhile, due to the particularity of vulcanized rubber, the vulcanized rubber cannot be effectively diffused within 3 months often, and the requirements on the smell and the comfort degree of the luggage compartment area cannot be met.
Thirdly, the rubber product is sealed by the packaging material to prevent the smell of the rubber product from emitting. But the packing of rubber component is sealed need look for suitable packaging material, and the cost is higher, and needs host computer factory assembly workshop increase equipment and personnel, has influenced holistic production beat, has promoted the human cost.
Disclosure of Invention
The invention provides a barrier coating, a preparation method thereof and a method for coating the barrier coating, wherein the barrier coating is formed by coating an organic material and an inorganic material on the surface of a rubber product under the synergistic action of the organic material and the inorganic material, so that the odor of the rubber product is directly blocked, and the defects of high difficulty, high cost and the like in the prior art are at least overcome.
The invention provides a barrier coating, which comprises a component A and a component B, wherein the component A comprises an isocyanate component, a first auxiliary agent and a first solvent; the mass ratio of the isocyanate component to the first auxiliary agent to the first solvent is 100: (0-100): (0 to 100); the component B comprises an amino compound, a defoaming agent, aluminum powder, a second auxiliary agent and a second solvent; the mass ratio of the amino compound to the defoaming agent to the aluminum powder to the second auxiliary agent to the second solvent is 100: (0.5-1): (2-7): (0-31): (100 to 131); the amino compound comprises polyaspartic acid; the mass ratio of the component A to the component B is 1-1.5: 1.
according to one embodiment of the present invention, the isocyanate component includes at least one of diphenylmethane diisocyanate, hexamethylene diisocyanate trimer.
According to one embodiment of the present invention, the amine equivalent of the amino compound is 200 to 300, and the amine equivalent is a quotient of a molecular weight of the amino compound divided by the number of active hydrogens in the amino compound.
According to an embodiment of the present invention, the defoaming agent includes a silicone-based defoaming agent; and/or the particle size of the aluminum powder satisfies the following conditions: d50 is not more than 30 μm, and D50 is a particle size at which the volume accumulation of the powdery aluminum reaches 50% from the small particle size side in the volume-based particle size distribution.
According to an embodiment of the present invention, the first auxiliary agent comprises a polyether polyol; and/or the first solvent comprises at least one of butyl acetate, ethyl acetate, acetone, cyclohexanone, toluene and xylene.
According to an embodiment of the present invention, the second auxiliary agent comprises an amino terminated polyether; and/or the second solvent comprises at least one of butyl acetate, ethyl acetate, acetone, cyclohexanone, toluene and xylene.
In a second aspect of the present invention, a preparation method of the above barrier coating is provided, which includes the following steps:
(1) under an inert atmosphere, mixing an isocyanate component, a first auxiliary agent and a first solvent according to a mass ratio of 100: (0-100): (0-100) mixing to obtain a component A; (2) under an inert atmosphere, mixing an amino compound, a defoaming agent, aluminum powder, a second auxiliary agent and a second solvent according to a mass ratio of 100: (0.5-1): (2-7): (0-31): (100-131) mixing to obtain a component B; (3) the component A and the component B are mixed according to the mass ratio of 1-1.5: 1, and mixing to obtain the barrier coating.
In a third aspect of the present invention, a method for applying a barrier coating on a rubber product is provided, wherein the barrier coating is applied on the surface of the rubber product, and after baking treatment, the barrier coating is formed on the surface of the rubber product.
According to an embodiment of the present invention, the conditions of the baking process are: the baking temperature is 50-70 ℃, and the drying time is 0.5-1 h.
According to one embodiment of the invention, the rubber article comprises a tire.
The implementation of the invention has at least the following beneficial effects:
the barrier coating is compounded by organic materials and inorganic materials and comprises a component A and a component B, wherein isocyanate in the component A and an amino compound of the component B can react to generate polyurea substances which have good barrier property; meanwhile, the amino compound in the component B is selected from polyaspartic acid, and the polyaspartic acid has slow reaction and can control the reaction rate; the inorganic component of the component B comprises a defoaming agent and aluminum powder, wherein the defoaming agent can prevent air from being doped into the barrier coating and increase the uniformity of the barrier coating; aluminum powder is added into the barrier coating, so that the aluminum powder is doped into the polyurea substance, the dispersibility of the barrier coating can be enhanced, and the barrier property of the barrier coating is further improved; in addition, the content of the auxiliary agent and the solvent is controlled, so that the reaction rate can be accelerated, and the fluidity of the barrier coating can be adjusted.
The blocking coating is coated on the rubber product, so that the blocking coating can be formed on the surface of the rubber product, and the blocking coating contains a polyurea substance generated by an isocyanate component and an amino compound, and a defoaming agent and aluminum powder which are uniformly dispersed on the polyurea substance, wherein the polarity of a urea group in the polyurea substance is large, a large number of hydrogen bonds can be formed, so that the molecular weight of the polyurea substance is large, gaps among molecular chains are small, and the blocking performance of the blocking coating is enhanced; the addition of the defoaming agent can prevent the barrier coating from foaming and avoid the damage of the coating; meanwhile, the aluminum powder can be uniformly dispersed on the barrier coating to form a continuous metal layer on the barrier coating, so that the sealing property of the barrier coating is further enhanced; in addition, the hardness degree of the barrier coating can be adjusted by controlling the contents of the first auxiliary agent of the component A and the second auxiliary agent of the component B.
In addition, the preparation method of the barrier coating has the advantages of low cost of preparation raw materials, simple preparation process, easy operation and the like, and is beneficial to industrial production and application.
Drawings
FIG. 1 illustrates a spray coating method according to an embodiment of the present invention;
FIG. 2 is a roll coating process according to an embodiment of the present invention;
FIG. 3 is a schematic view of a mixing apparatus according to an embodiment of the present invention;
FIG. 4 is a rubber article according to an embodiment of the present invention;
FIG. 5 is a toasting apparatus according to one embodiment of the present invention;
reference numerals:
1-tyre, 2-spray gun; 3-spraying; 4-rolling and coating a groove; 5-barrier coating; 6-a first inlet; 7-a second inlet; 8-a housing; 9-a stirring rod; 10-a cavity; 11-an inlet end; 12-an outlet end; 13-a connecting part; 14-a crown; 15-shoulder of the tyre; 16-a sidewall; 17-toe mouth; 19-baking oven; and 20-material frame.
Detailed Description
In order that those skilled in the art will better understand the concept of the present invention, the following detailed description is given with reference to the accompanying drawings.
The barrier coating provided by the invention comprises a component A and a component B, wherein the component A comprises an isocyanate component, a first auxiliary agent and a first solvent; the mass ratio of the isocyanate component to the first auxiliary agent to the first solvent is 100: (0-100): (0 to 100); the component B comprises an amino compound, a defoaming agent, aluminum powder, a second auxiliary agent and a second solvent; the mass ratio of the amino compound to the defoaming agent to the aluminum powder to the second auxiliary agent to the second solvent is 100: (0.5-1): (2-7): (0-31): (100 to 131); the amino compound comprises polyaspartic acid; the mass ratio of the component A to the component B is 1-1.5: 1.
specifically, the amino compound includes polyaspartic acid, and for example, polyaspartic acid resin of type F420 from feyoyan corporation is used. The polyaspartic acid reacts with the isocyanate component to generate polyurea substances, and in the reaction process, the reaction rate of the polyaspartic acid and the isocyanate component is reduced due to the low activity of the polyaspartic acid, so that the reaction rate is controlled. Meanwhile, the organic component and the inorganic component are used for cooperation, so that the barrier property of the barrier coating is further enhanced, wherein the defoaming agent in the inorganic component can prevent air from being doped into the barrier coating, and the uniformity of the barrier coating is improved; the aluminum powder is added into the barrier coating, so that the aluminum powder is doped into the polyurea substance, the dispersibility of the barrier coating can be enhanced, the pores of the polyurea substance are filled, and the barrier property of the barrier coating is further improved.
Specifically, the mass ratio of the component A to the component B is 1-1.5: 1, e.g. 1: 1. 1.2: 1. 1.5: 1 or any two thereof. The polyurea substance is formed by the reaction of the component A and the component B, polyurea molecular chains in the polyurea substance are closely arranged, and the polyurea substance has good tightness and can prevent odor from emitting.
Further, the first auxiliary agent comprises hydroxyl-terminated polymer substances, namely, the terminal group of the polymer is hydroxyl; the second auxiliary agent comprises amine-terminated polyether substances, namely the end group of the polymer is an amino group; the first assistant is added to adjust the proportion of polyurethane in the polyurea coating and increase the flexible chain segment of the polyurea coating. The second assistant is added for adjusting the flexibility and toughness of the polyurea coating and improving the anti-stripping strength of the barrier coating on the surface of a rubber product and other substances. Thereby improving the bonding strength and adhesive force of the barrier coating on the surfaces of rubber products and other substances. In addition, the addition of the first auxiliary agent and the second auxiliary agent can improve the hardness degree of the barrier coating when the barrier coating is cured into a film.
Further, the first solvent includes ester, ketone, amide solvents such as N, N-dimethylformamide. In some embodiments, the first solvent comprises at least one of butyl acetate, ethyl acetate, acetone, cyclohexanone, toluene, xylene, preferably butyl acetate, and the second solvent comprises at least one of butyl acetate, acetone, cyclohexanone, toluene, xylene, preferably ethyl acetate.
In some embodiments, the isocyanate component includes at least one of diphenylmethane diisocyanate, hexamethylene diisocyanate trimer. The diphenylmethane diisocyanate includes at least one of 4, 4' -diphenylmethane diisocyanate, 2, 4' -diphenylmethane diisocyanate, and 2, 2' -diphenylmethane diisocyanate. Such as MDI-50 from Vanhua, MDI-50, a mixture of 2, 4-diphenylmethane diisocyanate and 4, 4' -diphenylmethane diisocyanate. The isocyanate component of the present invention may also be a product comprising hexamethylene diisocyanate trimer, such as the HDI trimer model N3390 from Corsia. When the isocyanate component is selected from MDI-50, diluting the isocyanate component with a first solvent; when the isocyanate component is selected from HDI trimer, the isocyanate component may be diluted with the first solvent or may not be diluted with the first solvent.
Further, the mass ratio of isocyanate (-NCO) groups contained in MDI-50 was 30 to 34%, and the mass ratio of isocyanate groups contained in HDI trimer was 19 to 21%.
In some embodiments, the amine equivalent weight of the amino compound is in the range of 200 to 300, such as in the range of 200, 220, 234, 277, 300, or any two thereof. The amine equivalent weight is the quotient of the molecular weight of the amino compound divided by the number of active hydrogens in the amino compound.
In some embodiments, the anti-foaming agent comprises a silicone based anti-foaming agent, such as model 065 anti-foaming agent from BYK corporation.
In some embodiments, the particle size of the aluminum powder satisfies: d50 is less than or equal to 30 μm, D50 is the particle size of the aluminum powder reaching 50% of the volume accumulation from the small particle size side in the volume-based particle size distribution, D50 is also called average particle size or median diameter, and in general, the particle size is also called particle size, so that the test can be carried out by using a laser particle size analyzer. The aluminum powder in the above range is easily dispersed in the barrier coating. In the specific implementation process of the invention, the aluminum powder is flake aluminum powder obtained by a wet ball milling method.
In some embodiments, the first aid includes a polyether polyol, preferably a polyether polyol having a molecular weight of about 2000, such as a polypropylene oxide ether glycol (or polyoxypropylene glycol) having a molecular weight of 2000, and in the practice of the present invention, the hydroxyl number of the polypropylene oxide ether glycol (or polyoxypropylene glycol) is 56. The hydroxyl value is the number of milligrams of potassium hydroxide (KOH) corresponding to the hydroxyl groups in 1g of the sample, expressed as mgKOH/g.
In some embodiments, the second adjuvant comprises an amino terminated polyether, such as the D2000 model amino terminated polyether produced from hensmei.
The preparation method of the barrier coating provided by the invention comprises the following steps: under an inert atmosphere, mixing an isocyanate component, a first auxiliary agent and a first solvent according to a mass ratio of 100: (0-100): (0-100) mixing to obtain a component A; under an inert atmosphere, mixing an amino compound, a defoaming agent, aluminum powder, a second auxiliary agent and a second solvent according to a mass ratio of 100: (0.5-1): (2-7): (0-31): (100-131) mixing to obtain a component B; the component A and the component B are mixed according to the mass ratio of 1-1.5: 1, and mixing to obtain the barrier coating.
Specifically, under an inert atmosphere, mixing an isocyanate component, a first auxiliary agent and a first solvent according to a mass ratio of 100: (0-100): (0-100) the mixing process comprises: vacuumizing the first mixing equipment, introducing inert gas to replace the gas in the first mixing equipment, and simultaneously enabling the first mixing equipment to be in an inert atmosphere to avoid the entry of water vapor; heating the first mixing equipment, and mixing the isocyanate component, the first auxiliary agent and the first solvent according to the mass ratio of 100: (0-100): (0-100) adding the mixture into first mixing equipment, and stirring until the mixture is uniformly mixed, wherein the inert gas comprises nitrogen; the replacement process is carried out for 2-4 times; the first mixing device is capable of conducting heat, and the conditions of the stirring process are as follows: the temperature is 60-70 ℃, and the time is 1-2 h.
Specifically, under an inert atmosphere, amino compound, defoaming agent, aluminum powder, second auxiliary agent and second solvent are mixed according to the mass ratio of 100: (0.5-1): (2-7): (0-31): (100-131) the mixing process includes: pumping the second mixing equipment to vacuum, introducing inert gas to replace the gas in the second mixing equipment, and simultaneously enabling the second mixing equipment to be in an inert atmosphere to avoid the entrance of water vapor; heating the second mixing equipment, and mixing the amino compound, the defoaming agent, the aluminum powder, the second auxiliary agent and the second solvent according to the mass ratio of 100: (0.5-1): (2-7): (0-31): (100-131) adding the mixture into first mixing equipment, and stirring until the mixture is uniformly mixed, wherein the inert gas comprises nitrogen; the replacement process is carried out for 2-4 times; the first mixing device is capable of conducting heat, and the conditions of the stirring process are as follows: the temperature is 60-70 ℃, and the time is 1-2 h.
In the specific implementation process of the invention, the mixing device shown in fig. 3 is adopted for mixing treatment; the mixing device comprises an inlet end 11, an outlet end 12, a connecting part 13, a shell 8, a stirring rod 9 and a cavity 10, wherein materials to be mixed are introduced into the cavity 10 from the inlet end 11, and after being uniformly stirred by the stirring rod 9, the component B is collected at the outlet end 12. Firstly, adding the amino compound, the second auxiliary agent and the second solvent into a second mixing device according to the mass ratio, stirring for 0.5-1 h, then adding the defoaming agent and the aluminum powder into the second mixing device according to the mass ratio, and stirring for 0.5-1 h until the mixture is uniformly mixed.
In the specific implementation process of the invention, after the mixing process is finished, the mixture is cooled to room temperature, the component A is canned into the tank A, the component B is canned into the tank B, wherein the tank A and the tank B are in inert atmosphere, and the mixture is sealed and stored.
In general, the barrier coating is applied to the surface of a rubber product, and the solvent in the barrier coating is volatilized by air-drying, baking, or the like, to form a barrier coating layer.
The invention provides a method for coating a barrier coating on a rubber product, which comprises the steps of coating the barrier coating on the surface of the rubber product, and forming the barrier coating on the surface of the rubber product after baking treatment.
Specifically, the coating process includes at least one of spraying, rolling, and brushing. Among them, the spray coating is to disperse the barrier coating into uniform droplets (spray) by a spray gun with the aid of the pressure of compressed air, and apply the spray to the surface of the rubber product. The spray coating process results in relatively uniform and low usage of the spray coating, and therefore the coating process is preferably spray coating. Wherein, the roll coating is to mix the barrier coating in a roll coating groove, place the rubber product in the roll coating groove, and evenly coat (coat) the barrier coating on the surface of the rubber product through the rotation of the rubber product. The brushing is to uniformly coat the barrier coating on the surface of the rubber product by using brushing equipment such as a brush and the like.
Further, spraying was performed using a high-pressure airless sprayer (flush coater), such as a Gusmer H20/35 hydraulic spray apparatus; in the specific implementation process of the invention, the rubber product is placed on a platform; the A jar that will hold A component, the B jar that holds B component insert high-pressure airless spraying machine (flush coater) through the pipeline respectively, make A component, B component pump pressure to the inside of flush coater via the material pump, according to 1 ~ 1.5: 1, mixing the component A and the component B at the port of a spray gun 2 to form a spray 3 of the barrier coating, wherein the component A and the component B are subjected to pressurization treatment and heating treatment on a pipeline; the spray 3 is applied to the outer surface of the tyre, for example: uniformly spraying the spray 3 onto the first surface of the rubber product 1 to form a first spraying layer, standing for 10-30 min, and enabling the first spraying layer to form a surface dry state, namely that the barrier coating starts to form a film on the surface of the rubber product and is changed into a non-flowable state; after the surface of the first spraying layer starts to form a film, spraying a second spraying layer on the second surface of the rubber product, and standing for 10-30 min to form a spraying layer; and then baking to obtain the barrier coating, wherein the first surface and the second surface of the rubber product are oppositely arranged.
In the practice of the present invention, as shown in FIG. 2, the roll coating process comprises: and (3) mixing the component A and the component B according to the ratio of 1-1.5: 1, adding the barrier coating 5 into the roller coating tank 4 from the first inlet 6 or the second inlet 7 for mixing, and ensuring that the ratio of the liquid level height of the barrier coating 5 in the roller coating tank 4 to the height in the roller coating tank 4 is not lower than 2: 3; and (3) immersing the rubber product 1 into a roller coating tank 4 containing the barrier coating 5, and slowly rolling the rubber product to enable the barrier coating 5 to be uniformly adhered to the surface of the rubber product 1. In general, the isocyanate component of the A component and the polyaspartic acid of the B component in the barrier coating start to undergo a crosslinking reaction after 1 hour and gradually assume a surface dry state, so that the roll coating is suitable for small-lot processing.
In some embodiments, the conditions of the baking treatment are: the baking temperature is 50-70 ℃, such as 50 ℃, 60 ℃, 70 ℃ or any two of the two, and the drying time is 0.5-1 h, such as 0.5h, 0.8h, 1h or any two of the two.
In particular, the process of the baking treatment may be carried out in a baking apparatus comprising an oven, further the oven may be an electrically heated forced air oven. For example, the baking process includes: placing the rubber product with the spray coating on a support, and baking the spray coating by using baking equipment until the spray coating is completely dried to form the barrier coating, wherein the baking equipment comprises a material rack (support) 20 and an oven 19, and the support 20 is used for placing the rubber product to be baked, as shown in fig. 5.
In general, the rubber product is a product prepared by using rubber as a raw material, in some embodiments, as shown in fig. 1, the rubber product includes a tire 1, and by using the method for coating a barrier coating provided by the present invention, the barrier coating is coated on the surface of the tire, and after a baking treatment, a barrier coating is formed on the surface of the tire, which directly blocks a channel of odor emission of the tire, wherein the surface of the tire refers to an exposed surface of the tire 1, including a crown 14, a shoulder 15, a sidewall 16 and a toe opening 17 of the tire (as shown in fig. 4); the tire can be placed in a luggage compartment, and the smell in the luggage compartment can be further improved.
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Preparation of barrier coatings
Preparation of component A: MDI-50 and polypropylene oxide glycol (PPG) are mixed according to the mass ratio of 104: 100, wherein MDI-50 is MDI-50 produced by Vanhua, the isocyanate group content of the MDI-50 is 33.6%, the isocyanate group content of the A component is 15%, wherein the molecular weight of polypropylene oxide glycol (PPG) is 2000, and the hydroxyl value is 56;
preparation of the component B: the preparation method comprises the following steps of (1) mixing polyaspartic acid, amino-terminated polyether, defoaming agent, aluminum powder and butyl acetate according to the mass ratio of 200: 62: 1: 5: 262 to form component B, wherein the polyaspartic acid is Desmophen-NH-1220 resin from Corseus corporation, and the amine equivalent weight is 234; the amino-terminated polyether is D2000 produced by Hensmei company, the defoaming agent is 065 produced by BYK company, the aluminum powder is flake aluminum powder which is ball-milled by a wet method, and the average particle size is 6 mu m;
mixing the component A and the component B according to the weight ratio of 1.05: the mass ratio of 1 was fed into a spray gun system for mixing and the barrier coating was sprayed onto the tire surface using a spray gun apparatus as shown in figure 1.
Example 2
Preparation of barrier coatings
Preparation of component A: HDI trimer and butyl acetate were mixed as 100: 100 to form a component A; the HDI trimer is N3390 produced by Corsik corporation, and the mass ratio of isocyanate in the HDI trimer is 19.6 +/-0.3%;
preparation of the component B: polyaspartic acid, a defoaming agent, aluminum powder and butyl acetate are mixed according to the mass ratio of 73: 0.5: 5: 73 to form component B, wherein the polyaspartic acid is F420 resin from feiyang having an amine equivalent weight of 277; the defoaming agent is a 066N type powder produced by BYK company, the aluminum powder is flake aluminum powder subjected to wet ball milling, and the average particle size is 8 mu m;
mixing the component A and the component B according to the proportion of 1: the mass ratio of 1 was transferred to a roll coating tank as shown in FIG. 2, mixed, and the barrier coating material was applied to the tire surface by rolling the tire.
The odor grade of the tire is tested by referring to the odor test method of the nonmetal component assembly in the vehicle of the Jili assembly method standard Q/JLY J7111020, and the result shows that the odor grade of the tire without coating of the barrier coating is 4.5 grade, and the odor grade of the tire of the examples 1 and 2 is improved to 5.5 grade, which shows that the barrier coating can effectively seal the rubber odor of the tire and block the diffusion of the rubber odor.
According to the barrier coating and the preparation method thereof and the method for coating the barrier coating, the barrier coating is formed by combining an organic material and an inorganic material, so that the barrier property of the barrier coating is further improved; the blocking coating can be coated on the surface of the rubber product by adopting methods such as spraying, rolling, brushing and the like to form the blocking coating, the blocking coating can effectively seal the smell of the rubber and block the diffusion of the smell of the rubber, and the method has the advantages of low cost, easy operation and the like.
The above detailed description of the preferred embodiments of the present invention and experimental verification. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A barrier coating is characterized by comprising a component A and a component B, wherein the component A comprises an isocyanate component, a first auxiliary agent and a first solvent; the mass ratio of the isocyanate component to the first auxiliary agent to the first solvent is 100: (0-100): (0 to 100); the component B comprises an amino compound, a defoaming agent, aluminum powder, a second auxiliary agent and a second solvent; the mass ratio of the amino compound, the defoaming agent, the aluminum powder, the second auxiliary agent and the second solvent is 100: (0.5-1): (2-7): (0-31): (100 to 131); the amino compound comprises polyaspartic acid;
the mass ratio of the component A to the component B is 1-1.5: 1.
2. the barrier coating of claim 1, wherein the isocyanate component comprises at least one of diphenylmethane diisocyanate, hexamethylene diisocyanate trimer.
3. The barrier coating of claim 1, wherein the amine equivalent weight of the amino compound is 200 to 300, and the amine equivalent weight is the quotient of the molecular weight of the amino compound divided by the number of active hydrogens in the amino compound.
4. The barrier coating of claim 1, wherein the defoamer comprises a silicone-based defoamer; and/or the presence of a gas in the gas,
the particle size of the aluminum powder meets the following requirements: d50 is not more than 30 μm, and D50 is a particle size at which the volume accumulation of the powdery aluminum reaches 50% from the small particle size side in the volume-based particle size distribution.
5. The barrier coating of claim 1, wherein the first adjunct comprises a polyether polyol; and/or the presence of a gas in the gas,
the first solvent comprises at least one of butyl acetate, ethyl acetate, acetone, cyclohexanone, toluene and xylene.
6. The barrier coating of claim 1, wherein the second adjunct comprises an amino terminated polyether; and/or the presence of a gas in the gas,
the second solvent comprises at least one of butyl acetate, ethyl acetate, acetone, cyclohexanone, toluene and xylene.
7. A method of making a barrier coating according to claim 1, comprising the steps of:
(1) under an inert atmosphere, mixing an isocyanate component, a first auxiliary agent and a first solvent according to a mass ratio of 100: (0-100): (0-100) mixing to obtain a component A;
(2) under an inert atmosphere, mixing an amino compound, a defoaming agent, aluminum powder, a second auxiliary agent and a second solvent according to a mass ratio of 100: (0.5-1): (2-7): (0-31): (100-131) mixing to obtain a component B;
(3) the component A and the component B are mixed according to the mass ratio of 1-1.5: 1, and mixing to obtain the barrier coating.
8. A method for coating a barrier coating on a rubber product, which is characterized in that the barrier coating of any one of claims 1 to 6 is coated on the surface of the rubber product, and after baking treatment, the barrier coating is formed on the surface of the rubber product.
9. The production method according to claim 8, wherein the conditions of the baking treatment are: the baking temperature is 50-70 ℃, and the drying time is 0.5-1 h.
10. The method of claim 8, wherein the rubber article comprises a tire.
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| CN202210013648.7A CN114316764B (en) | 2022-01-06 | 2022-01-06 | Barrier coating, preparation method thereof and method for coating barrier coating |
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| CN202210013648.7A CN114316764B (en) | 2022-01-06 | 2022-01-06 | Barrier coating, preparation method thereof and method for coating barrier coating |
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| CN114316764B CN114316764B (en) | 2023-04-18 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102181221A (en) * | 2011-01-31 | 2011-09-14 | 北京东方雨虹防水技术股份有限公司 | Flame-retardant spraying polyurea elastic coating |
| CN110511656A (en) * | 2019-09-12 | 2019-11-29 | 中国科学院长春应用化学研究所 | A kind of two-component polyurea epidermis of spray mo(u)lding and preparation method thereof |
| CN110845685A (en) * | 2019-12-12 | 2020-02-28 | 中国科学院长春应用化学研究所 | Polyaspartic acid ester and polyurea-based repairing material for repairing polyurethane foam of automobile instrument panel, and preparation method and repairing method thereof |
| CN113045972A (en) * | 2019-12-27 | 2021-06-29 | 深圳市精彩科技有限公司 | Polyurea coating |
| CN113480925A (en) * | 2021-07-09 | 2021-10-08 | 成都上泰科技有限公司 | Method for manufacturing high-performance solvent-free flame-retardant polyurea coating |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102181221A (en) * | 2011-01-31 | 2011-09-14 | 北京东方雨虹防水技术股份有限公司 | Flame-retardant spraying polyurea elastic coating |
| CN110511656A (en) * | 2019-09-12 | 2019-11-29 | 中国科学院长春应用化学研究所 | A kind of two-component polyurea epidermis of spray mo(u)lding and preparation method thereof |
| CN110845685A (en) * | 2019-12-12 | 2020-02-28 | 中国科学院长春应用化学研究所 | Polyaspartic acid ester and polyurea-based repairing material for repairing polyurethane foam of automobile instrument panel, and preparation method and repairing method thereof |
| CN113045972A (en) * | 2019-12-27 | 2021-06-29 | 深圳市精彩科技有限公司 | Polyurea coating |
| CN113480925A (en) * | 2021-07-09 | 2021-10-08 | 成都上泰科技有限公司 | Method for manufacturing high-performance solvent-free flame-retardant polyurea coating |
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