CN115584195A

CN115584195A - Bi-component coating for helmet and preparation method thereof

Info

Publication number: CN115584195A
Application number: CN202211238907.2A
Authority: CN
Inventors: 李景菲; 徐芸莉; 沈振; 吴东亮
Original assignee: Zhejiang Academy Of Product Quality And Safety
Current assignee: Zhejiang Academy Of Product Quality And Safety
Priority date: 2022-10-11
Filing date: 2022-10-11
Publication date: 2023-01-10
Anticipated expiration: 2042-10-11
Also published as: CN115584195B

Abstract

The application discloses a bi-component coating for helmets and a preparation method thereof, wherein the bi-component coating contains a component A and a component B; the component A comprises the following components in parts by mass: 100 parts of hydroxyl acrylic resin, 8-35 parts of polyol resin, 2-12 parts of adhesion promoter, 15-45 parts of organic cold pigment and 40-120 parts of first diluent, wherein the organic cold pigment is at least one of benzimidazolone pigment and phthalocyanine pigment; the component B comprises the following components: 100 parts of isocyanate curing agent and 40-100 parts of second diluent. According to the double-component coating, the organic cold pigment is introduced into the formula, so that the infrared reflectivity of the coating is effectively improved, the infrared heat absorption capacity of the coating is greatly reduced, and meanwhile, the polyol resin and the adhesion promoter are matched, so that the coating has good adhesion performance with a helmet substrate, and has good fusion performance with a finish paint, and the coating is not easy to fall off after spraying.

Description

Bi-component coating for helmet and preparation method thereof

Technical Field

The application belongs to the technical field of paint preparation, and particularly relates to a bi-component paint for a helmet and a preparation method thereof.

Background

As a safety protection article, the helmet is a common and important protection tool in modern traffic, and the helmet mainly aims to protect the head of a driver and passengers when impacted, reduce strong impact force caused by violent collision or prevent a sharp object from directly penetrating into the head, and prevent or reduce injury and even save lives. In modern transportation, the helmet is used more and more frequently, the use amount of the helmet is increased rapidly, and the use and the comfort are also key factors considered by the existing consumers.

In order to enhance the competitiveness of products, the helmet is required to have excellent appearance, durability and wearing comfort in addition to basic safety protection performance. At present, the helmet shell is mainly made of plastic materials, and mainly comprises acrylonitrile-butadiene-styrene copolymer (ABS) resin, ABS and Polycarbonate (PC) alloy, glass fiber composite materials, carbon fiber composite materials and the like. In order to prolong the service life of composite material products such as helmets and the like and prevent the appearance and mechanical property of plastics from being attenuated due to thermal oxidation, the method of spraying paint for protection is a common means.

In the aspect of coating adhesion, because the plastic material belongs to a low surface energy substance, if the surface energy of the plastic material is lower than that of the liquid coating, the coating is difficult to wet the surface, and surface defects and poor adhesion are easily caused, so the common helmet shell coating is generally divided into three layers: prime coat, middle coat and top coat. The primer mainly adopts primer which can enhance the surface energy of plastics, has good transition property and more polar groups, and aims to form good adhesive force on the plastic substrate and have good matching property with the floating coat.

In terms of wearing comfort, the spectral band of solar radiation impinging on the earth's ground is in the range of about 295nm to 2500nm wavelength. Ultraviolet light, at wavelengths below 400nm, can cause degradation of coatings and polymers; wavelengths from 400nm to 760nm are known as visible light; the other from 760nm to 2500nm is the infrared region, where light of long wavelengths is not visible to the human eye, but this region contains half of the energy in sunlight that reaches the earth, where the energy of infrared light is perceived as heat. Because the helmet is used in outdoor places, the infrared light absorbing capacity of the helmet is converted into heat, and the wearing comfort is affected.

CN114181569A, a thermal insulation and preservation type reflective coating for helmets and a preparation method thereof, provides a method for adding hollow glass microsphere particles coated with aerogel films into a basic emulsion as a thermal insulation type reflective material to improve the thermal insulation and preservation performance of the reflective coating for helmets; CN112094542A, a coating for a reflective helmet and a preparation method thereof, provides a coating which is prepared by adding glass bead powder, aluminum oxide and silicon dioxide as reflective powder into transparent resin to improve the reflective effect of the coating; CN111876067A "Cooling composite coating for helmet and preparation method thereof" provides a heat radiation cooling layer, a near infrared reflection layer, and a contamination-resistant clear coat layer, which are sequentially coated from inside to outside, wherein the heat radiation cooling layer contains high heat reflection type titanium dioxide, nano far infrared powder, the near infrared reflection layer contains infrared high reflection type black pigment and high reflection silver flashing slurry, the infrared high reflection type black pigment is black perylene pigment, the inner layer coating in the patent does not consider the adhesion with the base material, and the design of multilayer structure leads to complex spraying preparation and coating steps, increased energy consumption cost, and poor bonding degree between different interlayer structures, which leads to easy peeling off between the coating and the coating, and affects the sense of the wearer.

Before the helmet shell is sprayed, oil stains, hand sweat, a release agent and the like are often spread on the surface of the helmet shell, so that the coating adhesion of the sprayed coating can be affected.

Disclosure of Invention

The application aims to overcome the defects of the prior art and provide a bi-component coating for a helmet and a preparation method thereof, so as to solve the technical problems that the existing helmet coating needs to be coated in three layers before being sprayed, the spraying process is complex, and the adhesion between the coating and the helmet is poor and the helmet is easy to fall off.

In order to achieve the above object, according to a first aspect of the present application, there is provided a two-component coating material for helmets, comprising a first component and a second component; the component A comprises the following components in parts by mass:

100 parts of hydroxy acrylic resin, 8-35 parts of polyol resin, 2-12 parts of adhesion promoter, 15-45 parts of organic cold pigment and 40-120 parts of first diluent, wherein the organic cold pigment is at least one of benzimidazolone pigment and phthalocyanine pigment;

the component B comprises the following components:

100 parts of isocyanate curing agent and 40-100 parts of second diluent.

Further, the organic cold pigment is a coupling agent modified pigment, and the modification process is as follows:

adding the benzimidazolone pigment or the phthalocyanine pigment into a third diluent, and performing ultrasonic dispersion for 0.5-2 h at the temperature of 30-50 ℃;

then adding a coupling agent, and carrying out ultrasonic treatment for 1-3 h at 50-60 ℃; the coupling agent is any one of titanate coupling agent, aluminate coupling agent, fluorosilane modified coupling agent, zirconate coupling agent, aluminum-zirconate coupling agent and aluminum-titanium composite coupling agent.

Further, the amount of the coupling agent added is 0.1 to 10% by mass of the benzimidazolone-based pigment or the phthalocyanine-based pigment.

Further, the polyol resin is at least one of polyester polyol, polycaprolactone polyol and polyether polyol.

Further, the adhesion promoter is at least one of modified chlorinated polyolefin or rosin resin.

Further, the benzimidazolone pigment is at least one of benzimidazolone H3R, benzimidazolone HG, benzimidazolone brown HFR and benzimidazolone brown HFM; and/or

The phthalocyanine pigment is phthalocyanine blue.

Further, the first diluent and the second diluent are respectively and independently one or a mixture of more than two of the following components: C7-C10 aromatic hydrocarbon, C3-C8 ester compound, C1-C5 alcohol compound and C2-C6 ketone compound.

Furthermore, the component A also comprises an auxiliary agent, wherein the auxiliary agent comprises at least one of an inorganic filler, a catalyst, a wetting dispersant, a leveling agent, a defoaming agent and an ultraviolet auxiliary agent.

In a second aspect of the present application, there is provided a method for preparing a two-component coating for helmets, comprising the steps of:

preparing a component A: taking the raw materials of the component A according to the mass ratio, sequentially adding hydroxyl acrylic resin, polyol resin, adhesion promoter and organic cold pigment into a first diluent under stirring, grinding after pre-dispersion until the particle fineness is less than or equal to 5 microns, and filtering;

preparing a component B: uniformly mixing the isocyanate curing agent and the second diluent according to the mass ratio, and filtering;

the component A and the component B are prepared and then stored respectively, and are mixed in proportion when in use, so that the bi-component coating for the helmet is obtained.

When the adhesive is used, the ratio of the isocyanate group in the component B to the hydroxyl group in the component A is 0.6-1.5: 1.0 mixing.

Compared with the prior art, the method has the following technical effects:

according to the double-component coating for the helmet, the organic cold pigment is introduced into the formula, so that the infrared reflectivity of the coating is effectively improved, the infrared heat absorption capacity of the coating is greatly reduced, the polyol resin and the adhesion promoter are matched, the coating and the helmet base material have good adhesion performance, the coating and the finish paint have good fusion performance, and the coating is not easy to fall off after spraying.

The bi-component coating for the helmet has good adhesive force with a helmet base material, can replace a base coating and a middle coating in the original process, combines the base coating and the middle coating into a whole, simplifies the production process, is more environment-friendly, solves the problem of complex existing process, makes the construction simple and convenient, reduces the cost, can be industrially produced, and is favorable for popularization and application.

The preparation method of the bi-component coating for the helmet is simple, the preparation conditions are stable and controllable, and large-scale production is easy to realize.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application more clearly apparent, the present application is further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

In this application, the term "and/or" describes an association relationship of associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a is present alone, A and B are present simultaneously, and B is present alone. Wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

In the present application, "at least one" means one or more, "a plurality" means two or more. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, "at least one (a), b, or c", or "at least one (a), b, and c", may each represent: a, b, c, a-b (i.e., a and b), a-c, b-c, or a-b-c, wherein a, b, and c may be single or plural, respectively.

It should be understood that, in various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, some or all of the steps may be executed in parallel or executed sequentially, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

The weight of the related components mentioned in the specification of the embodiments of the present application may not only refer to the specific content of each component, but also refer to the proportional relationship of the weight of each component, and therefore, the proportional enlargement or reduction of the content of the related components according to the specification of the embodiments of the present application is within the scope disclosed in the specification of the embodiments of the present application. Specifically, the mass described in the specification of the embodiments of the present application may be a mass unit known in the chemical industry field such as μ g, mg, g, kg, etc.

The terms "first" and "second" are used for descriptive purposes only and are used for distinguishing purposes such as substances from one another, and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. For example, a first XX may also be referred to as a second XX, and similarly, a second XX may also be referred to as a first XX, without departing from the scope of embodiments of the present application. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

In a first aspect, embodiments herein provide a two-component coating for helmets comprising a first component and a second component; the component A comprises the following components in parts by mass:

100 parts of hydroxyl acrylic resin, 8-35 parts of polyol resin, 2-12 parts of adhesion promoter, 15-45 parts of organic cold pigment and 40-120 parts of first diluent, wherein the organic cold pigment is at least one of benzimidazolone pigment and phthalocyanine pigment;

the component B comprises the following components:

100 parts of isocyanate curing agent and 40-100 parts of second diluent.

In the component A of the embodiment of the application, the hydroxyl acrylic resin is matrix resin and has more polar groups, so that the adhesive force with a plastic substrate can be increased, and the component A can have good matching property with a common finish paint. Preferably, the hydroxyl acrylic resin has a solid content of 20-70%, a hydroxyl value of 25-120 mg KOH/g, an acid value of less than or equal to 10.0mg KOH/g, and a viscosity of 1000-5000cps/25 ℃.

The polyol resin is one or a mixture of more than two of polyester polyol, polycaprolactone polyol and polyether polyol. The polyol resin has a long flexible chain structure, the shrinkage of the coating film is small, and the coating film and the base material form hydrogen bonds to contribute to the adhesion of the coating. The polyol resin is preferably polycaprolactone polyol and polyether polyol with ester groups, the acid value of the polyol resin is less than or equal to 10.0mg KOH/g, the hydroxyl content is 1.0-5.0%, the water content is less than or equal to 0.1%, and the hydroxyl content and the water content both refer to the mass percentage content. The polyol resin in the embodiment of the application is polyester polyol DESMOPHEN1652, polyester polyol DESMOPHEN1150 or Pastoca Capa3031 polycaprolactone polyol, dow CASE polyether polyol 3003LM produced by Germany Bayer company.

The adhesion promoter is a modified low molecular compound such as chlorinated polyolefin or rosin resin, is generally a silicone-free polymer solution, can form a molecular bridge between the coating film and the substrate through chemical reaction or physical action, and adheres the coating film and the substrate together.

The organic cold pigment is reflected in an infrared region, which means that less sunlight energy is absorbed, namely less heat is absorbed, and the heat absorption of the surface of the helmet can be effectively reduced. The organic cold pigment in the embodiment of the present application is one or two of a benzimidazolone pigment and a phthalocyanine pigment. Benzimidazolone based pigments include, but are not limited to, one or more of benzimidazolone H3R, benzimidazolone HG, benzimidazolone brown HFR, benzimidazolone reddish brown HFM. The phthalocyanine-based pigment is a pigment having a phthalocyanine skeleton, and includes phthalocyanine coordinated with various metals. The examples of the present application use an amorphous phthalocyanine-based pigment and a blue-based pigment such as phthalocyanine blue. The particle size of the organic cold pigment used in the examples of the present application is 0.01 to 0.20. Mu.m.

Further, the organic cold pigment of the embodiment of the application is a coupling agent modified pigment, and the modification process is as follows:

adding the benzimidazolone pigment or the phthalocyanine pigment into a third diluent, and performing ultrasonic dispersion for 0.5-2 h at the temperature of 30-50 ℃; the mass ratio of the benzimidazolone-based pigment or the phthalocyanine-based pigment to the third diluent may be selected from 100: (20-60);

The coupling agent improves the surface polarity of the organic cold pigment, improves the compatibility of the organic cold pigment and matrix resin, reduces the particle agglomeration phenomenon, improves the performances of the pigment in the aspects of wettability, dispersibility and the like, more effectively exerts the radiation refrigeration effect, further enhances the adhesive force between the coating and the helmet base material, and ensures that the sprayed coating is more difficult to fall off and the helmet is more weather-resistant.

In the examples of the present application, the amount of the coupling agent added is 0.1 to 10% by mass based on the mass of the benzimidazolone pigment or the phthalocyanine pigment. Preferably 0.3-5%, if the addition amount is less than 0.1%, the complete treatment of the organic cold pigment cannot be ensured, the fusion of the organic cold pigment and the matrix resin is influenced, and if the addition amount is more than 10%, the residual functional coupling agent can migrate to the surface, the adhesion of the coating and the base material is influenced, and the infrared reflection of the organic cold pigment is weakened.

In the component B, the isocyanate curing agent is aliphatic isocyanate which does not turn yellow, keeps gloss and resists pulverization, and preferably one or a mixture of more than two of isophorone diisocyanate (IPDI) tripolymer, hexamethylene Diisocyanate (HDI) biuret and Hexamethylene Diisocyanate (HDI) tripolymer.

In the component A and the component B of the embodiment of the application, the first diluent and the second diluent can reduce the surface tension of the coating, adjust the viscosity of the coating and prolong the application and storage time, generate a certain swelling effect on the surface of the base material, do not damage the smoothness of the surface of the base material, and improve the adhesion and the performance of the final coating. The first diluent, the second diluent and the third diluent are respectively and independently one or a mixture of more than two of the following components: C7-C10 aromatic hydrocarbon, C3-C8 ester compound, C1-C5 alcohol compound and C2-C6 ketone compound.

Further, the first diluent, the second diluent and the third diluent are respectively and independently one or a mixture of more than two of the following components: toluene, xylene, n-butyl acetate, propylene glycol methyl ether acetate, methyl formate, butyl formate, methyl glycol, methanol, n-butanol, butanone, ketone and cyclohexanone; the coating can be used in combination according to the performance and practical application condition of the coating, and more preferably, the coating is a mixture of one or more than two of the following components: toluene, xylene, methyl formate, butyl formate, propylene glycol methyl ether acetate and butanone.

In order to make the obtained coating layer have a certain covering power on a substrate, the component A of the two-component coating of the embodiment of the application can further comprise an auxiliary agent, and the auxiliary agent comprises at least one of inorganic filler, catalyst, wetting dispersant, leveling agent, defoaming agent and ultraviolet auxiliary agent.

The inorganic filler in the embodiment of the present application is preferably one or a mixture of two or more of rutile titanium dioxide, iron oxide black, nickel titanate yellow, iron oxide red, iron oxide yellow, and ultramarine. Further, it is preferably one or a mixture of two or more of titanium dioxide, carbon black, red iron oxide, yellow iron oxide, and ultramarine. The particle size of the inorganic filler is 1-15 mu m.

In addition, in order to improve the reaction rate of the polyisocyanate at room temperature, a catalyst can be added; in order to enhance the pigment lyophilic property, improve the mechanical grinding efficiency and prevent floating color and floating, a wetting dispersant can be added; leveling agents can be added to obtain a flat, smooth and uniform coating film; in order to suppress or eliminate bubbles generated during the coating process, a defoaming agent may be added.

The catalyst may be one or a mixture of two or more of a tertiary amine catalyst, a metal compound catalyst, and the preferred catalyst is a metal compound catalyst particularly suitable for increasing the reaction rate of aliphatic isocyanates, and most preferably zinc isooctanoate or dibutyltin dilaurate.

The wetting and dispersing agent is generally a copolymer containing an acid group or a solution of a high molecular weight block copolymer having a pigment affinity group, preferably BYK-163 or BYK-9010, manufactured by Bick chemical Co., ltd, germany.

The leveling agent is preferably polyester or polyether modified polydimethylsiloxane polymer, and can reduce the surface tension of the coating, increase the wettability of the coating to a base material and greatly improve the adhesive force of the coating on the surface of a plastic product. BYK-371, produced by Bick chemical Co., ltd, germany, is preferred.

The defoaming agent is an organic silicon defoaming agent, and improper selection of the defoaming agent or the type of the defoaming agent can cause the defects of shrinkage cavity, shrinkage edge, pin hole and the like of a coating film and also reduce the water resistance and the adhesive force of the coating film, so the selection of the type and the addition amount of the defoaming agent is required. Silicone resin-based defoaming agents such as polydimethylsiloxane are preferred.

The ultraviolet auxiliary agent comprises an ultraviolet absorbent and a hindered amine light stabilizer; the ultraviolet absorbent is benzophenone and/or benzotriazole.

In a second aspect of the embodiments of the present application, there is provided a method for preparing a two-component coating for helmets, comprising the steps of:

(1) Preparing a component A: taking the raw materials of the component A according to the mass ratio, sequentially adding hydroxyl acrylic resin, polyol resin, adhesion promoter and organic cold pigment into a first diluent under stirring, grinding after pre-dispersion until the particle fineness is less than or equal to 5 microns, and filtering; according to the requirement, an auxiliary agent can be added into the component A;

(2) Preparing a component B: uniformly mixing the isocyanate curing agent and the second diluent according to the mass ratio, and filtering;

(3) The component A and the component B are respectively stored after being prepared, and are mixed according to the proportion when in use, thus obtaining the bi-component coating for the helmet. Further, when the adhesive is used, the component A and the component B are mixed according to the mass ratio of isocyanate groups in the component B to hydroxyl groups in the component A of 0.6-1.5: 1.0 mixing. Preferably, the ratio of 0.8 to 1.2:1.0 Mixing, more preferably in a ratio of 1.0 to 1.2:1, most preferably in a ratio of 1.0:1.0 mixing. The component A and the component B are proportioned and mechanically and uniformly mixed to prepare the mixed coating, and the mixed coating can be directly sprayed on a helmet shell and baked for 30-120 min at 50-80 ℃ to prepare the helmet shell. The thickness of the coating is generally from 10 to 50 μm.

The amount of the substance of the hydroxyl group (OH) in the A component can be calculated from the hydroxyl value in the hydroxyacrylic acid contained in the A component. The hydroxyl value of the hydroxyacrylic resins is generally identified directly on the commercial package or may be self-detecting.

The amount of the substance having an isocyanate group (NCO) in the second component can be calculated from the NCO content (mass percentage content) in the isocyanate curing agent contained in the second component. The NCO value in the isocyanate curing agent is also a commodity identification parameter or can be detected by self.

The material of the helmet shell comprises but is not limited to ABS, ABS \ PC, PP and glass fiber rigid body; in the injection molding process of the helmet base material, the use of the release agent can cause the surface of a workpiece to be stained with greasy dirt such as the release agent and guide rail oil, so that after spraying, the surface has the problems of oil spots, pinholes, craters and the like, and the quality is greatly influenced, so the surface is wiped before coating. Helmet shell easily forms the internal stress in forming process, and the stress effect can lead to the coating to split after the spraying, consequently carries out annealing treatment to helmet shell, the inside stress release of casing of being convenient for. The annealing mode is to stand for 120-60min at 60-12 ℃. The helmet shell is easy to generate static electricity, fine dust and the like in the air can be adsorbed on the surface of a plastic product due to the static electricity, and the plastic product is difficult to remove due to the conventional blowing treatment, so that the static electricity removal and dust removal treatment by high-pressure plasma airflow is carried out.

The following examples illustrate a two-component coating for helmets and a method for preparing the same according to the examples of the present application.

Example 1

The embodiment 1 of the application provides a bi-component coating for helmets and a preparation method thereof, and the preparation method comprises the following steps:

putting 100g of butanone into a container, sequentially adding 100g of hydroxy acrylic resin MR7323E (hydroxyl value is 33mg KOH/g), 8g of polyester polyol DESMOPHEN1652,2g of adhesion promoter ADK,15g of benzimidazolone H3R,0.01g of catalyst zinc isooctanoate, 0.69g of wetting dispersant BYK-163, 24g of rutile titanium dioxide and 1g of carbon black under low-speed stirring, grinding by using a sand mill after pre-dispersion until the particle fineness is less than or equal to 5 micrometers, supplementing 0.3g of flatting agent BYK310, uniformly mixing, adjusting viscosity, and filtering to obtain component A pigment slurry; uniformly mixing 50g of isophorone diisocyanate (IPDI) trimer (NCO content is 37.5%) with 20g of xylene and 30g of butyl formate, and filtering to obtain a component B;

mixing the component A and the component B according to the NCO/OH molar ratio of 1.2:1.0, and spraying the mixture on the helmet shell made of ABS material by adopting a spraying mode, wherein the spraying amount is 100g/m ² Spraying pressure of 0.35MPa, drying and leveling at 25 ℃ for 8min, and curing and drying at 70 ℃ for 50min.

Example 2

The embodiment 2 of the application provides a bi-component coating for helmets and a preparation method thereof, and the preparation method comprises the following steps:

putting 50g of dimethylbenzene into a container, sequentially adding 100g of hydroxyl acrylic resin RS-5605 (hydroxyl value is 100mg KOH/g), 30g of polycaprolactone polyol Capa3031, 10g of adhesion promoter ADK,40g of benzimidazolone H3R,0.1g of catalyst dibutyltin dilaurate, 1.68g of wetting dispersant BYK-163, 25g of titanium dioxide and 3g of nano silicon dioxide under low-speed stirring, grinding by using a sand mill after pre-dispersion until the particle fineness is less than or equal to 5 micrometers, supplementing 0.1g of flatting agent BYK310, uniformly mixing, adjusting viscosity, and filtering to obtain component A pigment slurry; 60g of Hexamethylene Diisocyanate (HDI) trimer (NCO content 19.6%) and 50g of toluene were uniformly mixed and filtered to obtain a second component;

mixing the component A and the component B according to the NCO/OH molar ratio of 1.0:1.0, and spraying the mixture on the helmet shell made of ABS material by adopting a spraying mode, wherein the spraying amount is 100g/m ² Spraying pressure of 0.35MPa, drying and leveling at 25 ℃ for 8min, and curing and drying at 70 ℃ for 50min.

Example 3

The embodiment 3 of the application provides a bi-component coating for helmets and a preparation method thereof, and the preparation method comprises the following steps:

putting 50g of propylene glycol monomethyl ether acetate into a container, sequentially adding 100g of hydroxy acrylic resin MR7323E (hydroxyl value is 33mg KOH/g), 15g of polyether polyol 3003LM,8g of adhesion promoter ADK,35g of phthalocyanine blue, 0.1g of catalyst zinc isooctanoate, 1.6g of wetting dispersant BYK-163, 15g of titanium dioxide and 5g of carbon black under low-speed stirring, grinding by using a sand mill after pre-dispersion until the particle fineness is less than or equal to 5 micrometers, supplementing 0.1g of flatting agent BYK310, uniformly mixing, adjusting viscosity, and filtering to obtain component A pigment slurry; uniformly mixing 50g of Hexamethylene Diisocyanate (HDI) biuret (NCO content is 16.5%) and 50g of butyl formate, and filtering to obtain a component B;

Example 4

The difference from the example 1 is that the coupling agent modified benzimidazolone H3R is added into the component A, and the modification process is as follows: adding 100g of benzimidazolone H3R into 60g of butanone, and performing ultrasonic dispersion for 1H at 40 ℃; then, 0.3g of titanate coupling agent is added, ultrasonic treatment is carried out for 2H at 50 ℃, and the modified benzimidazolone H3R is obtained after filtration and drying. The other procedures are the same as in example 1.

Example 5

The difference from the embodiment 3 is that the coupling agent modified phthalocyanine blue is added into the component A, and the modification process is as follows: adding 100g of phthalocyanine blue into 50g of propylene glycol monomethyl ether acetate, and performing ultrasonic dispersion for 1h at 40 ℃; and then adding 0.5g of fluorosilane modified coupling agent, carrying out ultrasonic treatment for 2h at 50 ℃, filtering and drying to obtain the modified phthalocyanine blue. The other procedures are the same as in example 3.

Comparative example 1

The difference from example 1 is that polyester polyol DESMOPHEN1652 is not added to the component A, and the other processes are the same as example 1.

Comparative example 2

The difference from example 1 is that polyester polyol DESMOPHEN1652 and adhesion promoter ADK are not added to component A, and the other processes are the same as example 1.

Comparative example 3

The difference from the example 3 is that no polyether polyol 3003LM is added to the component A, and the other technological processes are the same as those of the example 3.

Comparative example 4

The difference from the embodiment 4 is that modified benzimidazolone H3R is not added in the component A, and the other technical processes are the same as the embodiment 4.

Comparative example 5

The difference from the example 5 is that modified phthalocyanine blue is not added in the component A, and other processes are the same as the example 5.

The adhesion test evaluation was performed on the sprayed helmet shells of examples 1 to 5, comparative examples 1 to 3 of the present application according to the ISO-2409-2007, and the test results are shown in table 1 below.

TABLE 1

As can be seen from table 1 above, the coatings prepared in examples 1 to 5 of the present application all had good adhesion to the helmet shell; compared with the examples 1 and 3, the examples 4 and 5 show that the adhesive force between the coating system and the helmet shell can be further improved by adding the coupling agent modified organic cold pigment into the component A of the coating, and the coating is less prone to falling off; comparative examples 1-3 show that the addition of a polyol resin and an adhesion promoter to the coating system helps to enhance the adhesion between the coating and the helmet shell.

The infrared reflectance test was performed on the coating films formed after the coating materials prepared in examples 1 to 5 and comparative examples 4 to 5 of the present application were sprayed, and the test method was: the film was placed in a UV/Vis/NIR Spectrometer (UV/Vis/NIR Spectrometers) model Lambda 950, perkin Elmer, measuring the reflectance of the film in the wavelength range 400 to 2500nm at a measurement interval of 1nm. The average value of the reflectance of the film in the wavelength range of 400 to 2500nm was defined as the reflectance R of the film. The test results are shown in table 2 below.

TABLE 2

As seen from table 2 above, the coating films formed after the coatings prepared in examples 1 to 5 of the present application are sprayed have infrared light reflectivity of more than 70%, and comparative examples 4 and 5 show that the infrared light reflectivity of the coatings can be significantly enhanced by adding the modified organic cold pigment to the coating system, so that the absorption of the helmet to the infrared light is reduced, the helmet temperature is reduced, and the helmet wearing comfort is improved.

Claims

1. A two-component coating for helmets, comprising a component A and a component B; the component A comprises the following components in parts by mass:

the component B comprises the following components:

100 parts of isocyanate curing agent and 40-100 parts of second diluent.

2. The two-component coating for helmets according to claim 1, wherein the organic cold pigment is a coupling agent modified pigment by the following process:

3. The two-component coating material for helmets according to claim 2, wherein the amount of the coupling agent added is 0.1 to 10% by mass of the benzimidazolone pigment or the phthalocyanine pigment.

4. The two-component coating material for helmets according to claim 1, wherein the polyol resin is at least one of polyester polyol, polycaprolactone polyol, and polyether polyol.

5. The two-component coating for helmets according to claim 1, wherein the adhesion promoter is at least one of a modified chlorinated polyolefin or a rosin resin.

6. The two-component coating material for helmets according to claim 1, wherein the benzimidazolone-based pigment is at least one of benzimidazolone H3R, benzimidazolone HG, benzimidazolone brown HFR, benzimidazolone reddish brown HFM; and/or

The phthalocyanine pigment is phthalocyanine blue.

7. The two-component helmet coating of claim 1 wherein the first diluent and the second diluent are each independently one or a mixture of two or more of: C7-C10 aromatic hydrocarbon, C3-C8 ester compound, C1-C5 alcohol compound and C2-C6 ketone compound.

8. The two-component coating material for helmets according to any one of claims 1 to 7, wherein the A component further comprises an auxiliary agent, and the auxiliary agent comprises at least one of an inorganic filler, a catalyst, a wetting dispersant, a leveling agent, an antifoaming agent, and an ultraviolet auxiliary agent.

9. A preparation method of a two-component coating for helmets is characterized by comprising the following steps:

the component A and the component B are respectively stored after being prepared, and are mixed in proportion when in use, so that the bicomponent coating for the helmet is obtained.

10. The method of claim 9, wherein the ratio of the isocyanate group in the component b to the hydroxyl group in the component a is 0.6 to 1.5:1.0 mixing.