CN110527418B - Double-component elastic coating and preparation method thereof - Google Patents
Double-component elastic coating and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a two-component elastic coating and a preparation method thereof, wherein the two-component elastic coating comprises a component A: 60-70 parts of aqueous polyurethane dispersion, 1.5-2.5 parts of lignocellulose/expandable graphite composite material, 1-8 parts of hand feeling auxiliary agent, 8-10 parts of organic silicone powder, 0.05-0.5 part of nano silver, 0.5-1 part of anion powder, 3-6 parts of flame retardant, 0.2-1 part of fumed silica, 0.3-0.5 part of pH regulator, 1-3 parts of base material wetting agent, 5-10 parts of pigment, 2-3 parts of defoaming agent, 5-10 parts of dispersing agent, 3-7 parts of film forming auxiliary agent, 0.2-0.8 part of thickening agent and 20-30 parts of deionized water; and B component: 20-25 parts of water-based isocyanate curing agent and 10-15 parts of cosolvent. The double-component elastic coating provided by the invention has multiple advantages of high elasticity, stain resistance, good scratch resistance and the like, and has higher practical value.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a two-component elastic coating and a preparation method thereof.
Background
The elastic coating is prepared by taking synthetic resin emulsion as a base material, and mixing the base material with pigment, filler and auxiliary agent, and after the elastic coating is coated to a certain thickness (the thickness of a dry film is more than or equal to 150 mu m), the elastic functional coating has the function of covering tiny cracks generated by the expansion and contraction of the base material. The elastic coating has the characteristics of rich expressive force, strong stereoscopic impression, strong plasticity, strong adhesive force, scrubbing resistance, fastness, cracking resistance, good scratch resistance and strong automatic repairing force, is favored by more and more people, and the market share is rapidly expanded.
In recent years, with the improvement of the living standard of people, the requirement of people on the comfort of the interior trim of the automobile is continuously improved, and people hope to have a material which has soft touch feeling and is close to the texture of skin. Genuine leather and artificial leather are not only expensive and environmentally unfriendly, but also difficult to be wrapped on plastic parts. In order to solve this problem, an elastic paint meeting the automotive interior requirements is needed. In view of the special functional structure and the use environment of the interior of automobiles, the elastomeric coatings used also have high requirements, namely, good soft touch, and excellent stain resistance, scratch resistance, toughness and temperature resistance. However, the existing elastic coating can not find a balance point of elasticity, stain resistance and scratch resistance, so that the coating has the advantages of crack resistance of the elastic coating and the conflicting characteristics of high stain resistance and high scratch resistance. Therefore, it is a trend in the automotive coating development industry to develop a coating for automotive interiors that has both excellent properties of elasticity and stain and scratch resistance.
Disclosure of Invention
Aiming at the problem that the existing elastic coating in the prior art cannot meet the performance requirements of elasticity, stain resistance and scratch resistance, the invention provides a two-component elastic coating and a preparation method thereof.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the double-component elastic coating comprises a component A and a component B, wherein the component A comprises the following raw material components in parts by mass: 60-70 parts of aqueous polyurethane dispersoid, 1.5-2.5 parts of lignocellulose/expandable graphite composite material, 1-8 parts of hand feeling auxiliary agent, 8-10 parts of organic silicone powder, 0.05-0.5 part of nano-silver, 0.5-1 part of anion powder, 3-6 parts of flame retardant, 0.2-1 part of fumed silica, 0.3-0.5 part of pH regulator, 1-3 parts of base material wetting agent, 5-10 parts of pigment, 2-3 parts of defoaming agent, 5-10 parts of dispersing agent, 3-7 parts of film forming auxiliary agent, 0.2-0.8 part of thickening agent and 20-30 parts of deionized water;
the component B comprises the following raw material components in percentage by mass: 20-25 parts of water-based isocyanate curing agent and 10-15 parts of cosolvent;
the mass ratio of the component A to the component B is 5-7.
Compared with the prior art, the two-component elastic coating provided by the invention has the advantages that the aqueous polyurethane dispersion is selected as a film forming substance, and the lignocellulose/expandable graphite composite material with a specific proportion is added, so that the elasticity and toughness of the coating are obviously improved; the organic silicone powder and the fumed silica are added in a specific ratio, so that the stain resistance and the scratch resistance of the coating are obviously improved; by matching with other auxiliary agents, the coating provided by the invention has multiple advantages of high elasticity, high stain resistance, scratch resistance and the like. The waterborne two-component elastic coating provided by the invention has extremely low VOC content, can reduce the pollution to the environment and the damage to the human body to the maximum extent, and has wide application prospect and development potential.
Preferably, the aqueous polyurethane dispersion is a mixture of a high molecular weight aqueous polyurethane dispersion and an anionic aliphatic aqueous hydroxyl polyurethane dispersion in a mass ratio of 0.8 to 1.2.
More preferably, the high molecular weight aqueous polyurethane dispersion is Crysol 6110 in Wanhua chemistry, and the anionic aliphatic aqueous hydroxyl polyurethane dispersion is Crysol 6512 in Wanhua chemistry.
Generally, the higher the elasticity of the coating, the poorer the stain resistance. Such as fumed silica, silicone powder, can improve the scratch and stain resistance of the coating, but can reduce the elasticity of the coating; the addition of the lignocellulose/expandable graphite composite material can improve the elasticity and the flame retardance of the coating, but can reduce the hardness and the stain resistance of the coating to a certain extent; the addition of the anion powder can endow the paint with the effects of air purification, degerming and bacteriostasis, but also can reduce the elasticity of the paint; each of these materials is added in consideration of its influence on the elasticity and stain resistance of the coating material, and therefore, a balance point is found at which the coating material has both elasticity and stain resistance.
According to the invention, through the preferable combination of two kinds of resins, the coating has excellent flexibility, wear resistance and compression-resistant retraction elasticity, and meanwhile, the coating has the advantage of soft hand feeling; by adding the lignocellulose/expandable graphite composite material, the organic silicone powder and the fumed silica in a specific proportion and matching with the auxiliary agent in a specific proportion, the prepared coating achieves the best elasticity and stain resistance and presents a balanced state.
Preferably, the preparation method of the lignocellulose/expandable graphite composite material comprises the following steps:
step a, adding water into nano lignocellulose and expandable graphite for dispersing to obtain nano cellulose dispersion liquid and expandable graphite dispersion liquid;
and b, adding the expandable graphite dispersion liquid into the nano-cellulose dispersion liquid, stirring and reacting for 10-14h at the temperature of 60-80 ℃, washing, filtering and drying to obtain the lignocellulose/expandable graphite composite material.
The expandable graphite is a novel functional carbon material, and the effect of a heat insulation layer formed by rapidly expanding the high-temperature volume of the expandable graphite is mainly utilized in the prior art, so that the expandable graphite is used as a flame retardant material to be applied to the coating. Because the degree of mineralization of the graphite surface is high and is neither lipophilic nor hydrophilic, the expandable graphite has poor compatibility with other components in the coating. When used as a flame retardant material, the compatibility of the expandable graphite with other components is not so high. However, if one wants to utilize the special structure of expandable graphite to enhance the compression resilience and toughness of the coating, one must solve the problem of compatibility of the expandable graphite with other components, especially the film-forming material. According to the invention, the expandable graphite and the lignocellulose form a self-assembled composite material, so that the compatibility of the expandable graphite with the aqueous polyurethane dispersion and other auxiliaries can be effectively improved, and the compression resilience and toughness of the coating are obviously improved; meanwhile, the problem of agglomeration of the expandable graphite in a coating system can be avoided, the uniformity of the coating system is obviously improved, and the construction effect is improved.
The surface of the lignocellulose has rich hydroxyl functional groups, which is beneficial to the surface functional modification of the expandable graphite, through the reaction, the lignocellulose and the expandable graphite can be subjected to intercalation self-assembly, the compatibility of the expandable graphite and the polyurethane dispersoid is obviously improved, the coating has the advantage of high elasticity, and meanwhile, the existence of the lignocellulose can also obviously improve the toughness of the coating.
Preferably, the mass ratio of the nano lignocellulose to the expandable graphite is 2-4.
Preferably, the mass concentration of the nano-cellulose dispersion liquid is 0.5-1.0wt%, and the mass concentration of the expandable graphite dispersion liquid is 2-4wt%.
The preferred conditions described above favor sufficient self-assembly of the lignocellulose and expandable graphite.
Preferably, the hand feeling auxiliary agent is modified polyurethane elastic powder.
More preferably, the hand feeling auxiliary agent is Acure D820 polyurethane elastic powder.
The preferable hand feeling auxiliary agent is matched with the aqueous polyurethane dispersion for use, so that a paint film can be endowed with good smooth feeling, the luster of the paint film is reduced, and the wear resistance of the paint film is obviously improved.
Preferably, the organosilicone powder is polymethylsilsesquioxane.
More preferably, the silicone powder is BT-9273 silicone powder of Guangzhou Batai chemical company Limited.
The preferable organic silicone powder is a high-performance organic-inorganic hybrid material of polysiloxane polymers with a true spherical structure prepared by adopting a special process technology, and the organic silicone powder can be cooperated with a lignocellulose/expandable graphite composite material to endow a paint film with velvet-like soft feeling, improve the surface smoothness and improve the elasticity and the stain resistance of the paint film. The addition of the organic silicone powder can promote the dispersion of the pigment and the gas-phase silicon dioxide, improve the compatibility between organic matters and inorganic matters, and improve the effects of hydrophobicity, oleophobicity, scratch resistance, fingerprint mark resistance and the like of a paint film.
Preferably, the nano silver is an OLNMY-01 monomer nano silver solution of the environmental protection science and technology limited of Ouyan, luoyang.
The probability of the decorative coating contacting with human body is higher, so that the propagation of bacteria can be caused, and the nano silver can be added to effectively inhibit the propagation of bacteria, so that the elastic coating prepared by the invention is healthier and more environment-friendly.
Preferably, the anion powder is anion powder of Shijiazhuang Changli mineral products, inc.
The negative ion powder is added, so that the coating has the functions of purifying air in a vehicle and eliminating peculiar smell of the air, and meanwhile, the negative ion powder can enhance the bacteriostatic and degerming effects of the coating, and further reduce the spread of bacteria.
Preferably, the flame retardant is a halogen-free organophosphorus flame retardant.
More preferably, the flame retardant is Doher-6206, a flame retardant from Dow New Material science and technology, inc., of Dongguan.
The optimized flame retardant has good compatibility with other components and excellent flame retardant effect, and can remarkably improve the flame retardant effect of the coating and reduce the spontaneous combustion phenomenon of the automobile in a high-temperature environment by cooperating with the lignocellulose/expandable graphite composite material.
Preferably, the pH regulator is N, N-dimethylethanolamine.
The preferable pH regulator not only has the effect of regulating the pH, but also is an organic substance and has certain auxiliary film forming characteristics.
Preferably, the substrate wetting agent is a polyether modified silicone based wetting agent, such as BYK-331, bick, germany, or Tego-4100, digao.
The polyether modified polysiloxane has the advantages of ethers and organic silicon substances, has excellent substrate wettability, excellent flow promotion property and high compatibility, has the capability of improving scratch resistance, can prevent shrinkage cavity and pigment flooding, does not generate foam stabilization, does not increase surface smoothness, and does not damage the recoatability of the coating.
Preferably, the defoamer is a silicone based defoamer such as BYK-028 or BYK-024 from Bike, germany.
The preferable defoaming agent has a lasting defoaming and foam inhibiting effect, has no side effect on the appearance and uniformity of the paint film, and does not cause the phenomenon that fish eyes, craters and the like influence the appearance of the paint film. The foaming agent can be applied to the system and can also prevent the foaming generated in the process of adding the curing agent.
Preferably, the dispersant is a high molecular weight block copolymer dispersant such as BYK-190 or BYK-194, bick, germany.
The high molecular weight block copolymer dispersants can deflocculate the pigment by steric hindrance, and the deflocculated pigment particles are small, thereby enhancing the gloss and strength of the paint film.
Preferably, the film-forming assistant is a mixture of dipropylene glycol methyl ether and dipropylene glycol butyl ether in a mass ratio of 2-4.
The dipropylene glycol methyl ether and the dipropylene glycol butyl ether with high boiling points are selected and compounded according to a specific proportion, so that the lowest film forming temperature of a paint film can be effectively reduced, the film forming performance of the paint film is improved, and the stain resistance, the strength and the weather resistance of the paint film are improved.
Preferably, the thickener is an alkali swelling associative thickener.
More preferably, the thickener is RW-8M from Rohm and Haas.
The alkali swelling association type thickener has certain surfactant performance, a reticular cross-linked structure formed by macromolecules of the thickener is separated at a high shearing rate to reduce the viscosity, the cross-linked structure is formed again after shearing is removed to recover the viscosity, but the re-association takes time, so the recovery of the viscosity is not as fast as that of cellulose, the leveling is facilitated, the gloss is improved, meanwhile, under the general condition, the thickener is condensed together and expands when meeting alkali, and the alkali swelling association type thickener is compounded with the organic silicon ketone powder for use, so the dispersibility of the pigment, the fumed silica and the lignocellulose/expandable graphite is improved, and the storage stability of the paint is greatly improved.
Preferably, the cosolvent is propylene glycol methyl ether acetate.
The preferable cosolvent can fully dissolve the isocyanate curing agent, is favorable for fully mixing the dissolved isocyanate curing agent with the component A, improves the crosslinking speed and further shortens the drying time.
Preferably, the aqueous isocyanate curing agent is Bayer Germany
3100。
The invention also provides a preparation method of the two-component elastic coating, which at least comprises the following steps:
step a, weighing the components according to the design proportion of the two-component elastic coating, uniformly stirring the weighed dispersing agent, 40-60wt% of defoaming agent, 40-60wt% of pH regulator, nano-silver, lignocellulose/expandable graphite composite material, organic silicone powder, anion powder, flame retardant, fumed silica, pigment and 40-60wt% of deionized water, and grinding the mixture until the fineness is less than or equal to 30 mu m to obtain a first mixed material;
step b, adding the weighed aqueous polyurethane dispersion into the first mixed material, uniformly stirring, then sequentially adding the weighed film-forming aid, the rest pH regulator, the rest defoamer, the rest deionized water, the hand feeling aid and the base material wetting agent, uniformly mixing, adding the thickener, and adjusting the viscosity of the paint-4 cup at 25 ℃ to 85-100S to obtain a component A;
step c, uniformly mixing the weighed water-based isocyanate curing agent and cosolvent to obtain a component B;
and d, mixing the component A and the component B according to the designed proportion to obtain the double-component elastic coating.
The preparation method is simple to operate, free of complex procedures, free of special equipment, low in cost and suitable for industrial large-scale production, and the prepared double-component elastic coating has smooth hand feeling, gorgeous appearance and stereoscopic elastic effect, has good self-cleaning effect, fingerprint and oil stain mark prevention effect, excellent water resistance, flame retardance, weather resistance and other performances, has the functions of lasting sterilization and negative ion release, can meet the performance requirements of high-grade automotive interior coatings, and has wide market prospect.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The embodiment of the invention provides a two-component elastic coating, wherein a component A comprises the following raw material components in parts by mass: 60g of aqueous polyurethane dispersion, 2g of lignocellulose/expandable graphite composite material, 1g of hand feeling auxiliary agent, 9g of organic silicone powder, 0.2g of nano-silver, 0.8g of anion powder, 3g of flame retardant, 0.2g of fumed silica, 0.5g of pH regulator, 1g of base material wetting agent, 10g of pigment, 3g of defoaming agent, 5g of dispersing agent, 7g of film forming auxiliary agent, 0.6g of thickening agent and 30g of deionized water;
the component B comprises the following raw material components in percentage by mass: 25g of water-based isocyanate curing agent and 10g of cosolvent;
the mass ratio of the component A to the component B is 5.
Wherein the mass ratio of the aqueous polyurethane dispersion is 1.2 of Crysol 6110 and Crysol 6512 of; the hand feeling auxiliary agent is Acure D820 polyurethane elastic powder; the organic silicone powder is BT-9273 silicone powder of Guangzhou Batai chemical company Limited; the nano silver is OLNMY-01 monomer nano silver solution of the environmental protection science and technology limited company of Ouyang Olun; the anion powder is anion powder of Shijiazhuang Changli mineral products company Limited; the flame retardant is Doher-6206 of a flame retardant of DaoEr new material science and technology Limited company in Dongguan; the pH regulator is N, N-dimethylethanolamine from Pasteur Germany; the substrate wetting agent is Tego-4100 with digao; the defoaming agent is BYK-028 of Germany Bike; the film-forming assistant is a mixture of dipropylene glycol methyl ether and dipropylene glycol butyl ether with the mass ratio of 2; the thickening agent is RW-8M of Rohm and Haas; the aqueous isocyanate curing agent is German Bayer
3100; the cosolvent is propylene glycol methyl ether acetate in Dow chemical industry.
The preparation method of the lignocellulose/expandable graphite composite material comprises the following steps:
step a, weighing 4g of nano lignocellulose, adding the nano lignocellulose into 796mL of water, and uniformly dispersing to obtain nano cellulose dispersion liquid with the mass concentration of 0.5 wt%;
step b, weighing 2g of expandable graphite, adding into 64mL of water, and uniformly dispersing to obtain expandable graphite dispersion liquid with the mass concentration of 3 wt%;
and c, slowly adding the expandable graphite dispersion liquid into the nano-cellulose dispersion liquid, stirring and reacting for 14 hours at the temperature of 60 ℃, washing, filtering and drying to obtain the lignocellulose/expandable graphite composite material.
The expanded graphite is EG-150 expanded graphite of Qingdao rock-ocean carbon materials Co., ltd; the nano lignocellulose is prepared according to a conventional preparation method in the field.
The preparation steps of the two-component elastic coating are as follows:
step a, weighing the components according to the design proportion of the two-component elastic coating, stirring the weighed dispersing agent, 40-60wt% of defoaming agent, 40-60wt% of pH regulator, nano-silver, lignocellulose/expandable graphite composite material, organic silicone powder, anion powder, flame retardant, fumed silica, pigment and 40-60wt% of deionized water for 30min under the condition of 400r/min, and grinding until the fineness is less than or equal to 30 mu m to obtain a first mixed material;
step b, adding the weighed aqueous polyurethane dispersion into the first mixed material, stirring for 30min under the condition of 500r/min, then sequentially adding the weighed film-forming aid, the rest pH regulator, the rest defoamer, the rest deionized water, the hand feeling aid and the base material wetting agent, adjusting the rotation speed to 600r/min, stirring for 40min, adding the thickener, and adjusting the viscosity of a coating-4 cup at 25 ℃ to 85-100S to obtain a component A;
step c, uniformly mixing the weighed water-based isocyanate curing agent and cosolvent to obtain a component B;
and d, when in use, mixing the components A and B according to the designed proportion to obtain the two-component elastic coating.
Example 2
The embodiment of the invention provides a two-component elastic coating, wherein a component A comprises the following raw material components in parts by mass: 65g of aqueous polyurethane dispersion, 2.5g of lignocellulose/expandable graphite composite material, 5g of hand feeling auxiliary agent, 10g of organic silicone powder, 0.05g of nano-silver, 1g of anion powder, 6g of flame retardant, 0.6g of fumed silica, 0.3g of pH regulator, 2g of base material wetting agent, 8g of pigment, 2.5g of defoaming agent, 8g of dispersing agent, 5g of film forming auxiliary agent, 0.2g of thickening agent and 25g of deionized water;
the component B comprises the following raw material components in percentage by mass: 20g of water-based isocyanate curing agent and 15g of cosolvent;
the mass ratio of the component A to the component B is 7.
The above-mentioned components are given the same designations as in example 1, except that: the mass ratio of the aqueous polyurethane dispersion is 1 to 1, namely Crysol 6110 and Crysol 6512; the film-forming assistant is a mixture of dipropylene glycol methyl ether and dipropylene glycol butyl ether in a mass ratio of 3.
The preparation method of the lignocellulose/expandable graphite composite material comprises the following steps:
step a, weighing 3g of nano lignocellulose, adding the nano lignocellulose into 33mL of water, and uniformly dispersing to obtain nano cellulose dispersion liquid with the mass concentration of 0.8 wt%;
step b, weighing 1g of expandable graphite, adding into 24mL of water, and uniformly dispersing to obtain expandable graphite dispersion liquid with the mass concentration of 4 wt%;
and c, adding the expandable graphite dispersion liquid into the nano-cellulose dispersion liquid, stirring and reacting for 10 hours at 80 ℃, washing, filtering and drying to obtain the lignocellulose/expandable graphite composite material.
The preparation method of the two-component elastic coating is the same as that of example 1, and the details are not repeated herein.
Example 3
The embodiment of the invention provides a two-component elastic coating, wherein a component A comprises the following raw material components in parts by mass: 70g of aqueous polyurethane dispersion, 1.5g of lignocellulose/expandable graphite composite material, 8g of hand feeling auxiliary agent, 8g of organic silicone powder, 0.5g of nano-silver, 0.5g of anion powder, 4g of flame retardant, 1g of fumed silica, 0.4g of pH regulator, 3g of base material wetting agent, 5g of pigment, 2g of defoaming agent, 10g of dispersing agent, 3g of film-forming auxiliary agent, 0.8g of thickening agent and 20g of deionized water;
the component B comprises the following raw material components in percentage by mass: 23g of water-based isocyanate curing agent and 13g of cosolvent;
the mass ratio of the component A to the component B is 6.
The above-mentioned components are given the same designations as in example 1, except that: the mass ratio of the aqueous polyurethane dispersion is 0.8; the film-forming assistant is a mixture of dipropylene glycol methyl ether and dipropylene glycol butyl ether with the mass ratio of 4.
The preparation method of the lignocellulose/expandable graphite composite material comprises the following steps:
step a, weighing 4g of nano lignocellulose, adding the nano lignocellulose into 396mL of water, and uniformly dispersing to obtain nano cellulose dispersion liquid with the mass concentration of 1.0 wt%;
step b, weighing 1g of expandable graphite, adding the expandable graphite into 49mL of water, and uniformly dispersing to obtain expandable graphite dispersion liquid with the mass concentration of 2 wt%;
and c, adding the expandable graphite dispersion liquid into the nano-cellulose dispersion liquid, stirring and reacting for 12 hours at 70 ℃, washing, filtering and drying to obtain the lignocellulose/expandable graphite composite material.
The preparation method of the two-component elastic coating is the same as that of example 1, and the details are not repeated herein.
Comparative example 1
The comparative example of the present invention provides a two-component elastic coating, and the formulation and preparation method of the coating are the same as those of example 3. Except that the lignocellulosic/expandable graphite composite material of example 3 was replaced with expandable graphite.
In order to better demonstrate the performance of the two-component elastic coating prepared in the examples of the present invention, the two-component elastic coating of the above examples 1-3 and comparative example 1 was subjected to performance tests, and the results are shown in Table 1.
TABLE 1
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. The double-component elastic coating comprises a component A and a component B, and is characterized in that the component A comprises the following raw material components in parts by mass: 60-70 parts of aqueous polyurethane dispersoid, 1.5-2.5 parts of lignocellulose/expandable graphite composite material, 1-8 parts of hand feeling auxiliary agent, 8-10 parts of organic silicone powder, 0.05-0.5 part of nano-silver, 0.5-1 part of anion powder, 3-6 parts of flame retardant, 0.2-1 part of fumed silica, 0.3-0.5 part of pH regulator, 1-3 parts of base material wetting agent, 5-10 parts of pigment, 2-3 parts of defoaming agent, 5-10 parts of dispersing agent, 3-7 parts of film forming auxiliary agent, 0.2-0.8 part of thickening agent and 20-30 parts of deionized water;
the component B comprises the following raw material components in percentage by mass: 20-25 parts of water-based isocyanate curing agent and 10-15 parts of cosolvent;
the mass ratio of the component A to the component B is 5-7;
the aqueous polyurethane dispersion is a mixture of a high molecular weight aqueous polyurethane dispersion and an anionic aliphatic aqueous hydroxyl polyurethane dispersion in a mass ratio of 0.8-1.2;
the high molecular weight waterborne polyurethane dispersoid is Wanhua chemical Crysol 6110, and the anionic aliphatic waterborne hydroxyl polyurethane dispersoid is Wanhua chemical Crysol 6512; the hand feeling auxiliary agent is Acure D820 polyurethane elastic powder; the organic silicone powder is BT-9273 silicone powder of Guangzhou Batai chemical company Limited;
the preparation method of the lignocellulose/expandable graphite composite material comprises the following steps:
step a, respectively adding water into nano lignocellulose and expandable graphite for dispersion to obtain nano cellulose dispersion liquid and expandable graphite dispersion liquid;
and b, adding the expandable graphite dispersion liquid into the nano-cellulose dispersion liquid, stirring and reacting for 10-14h at the temperature of 60-80 ℃, washing, filtering and drying to obtain the lignocellulose/expandable graphite composite material.
2. The two-component elastic coating according to claim 1, wherein the mass ratio of the nano lignocellulose to the expandable graphite is 2-4.
3. The two-component elastic coating of claim 2, wherein the nanocellulose dispersion has a mass concentration of 0.5 to 1.0wt% and the expandable graphite dispersion has a mass concentration of 2 to 4wt%.
4. The two-component elastomeric coating of claim 1, wherein the substrate wetting agent is a polyether modified polysiloxane wetting agent; and/or
The pH regulator is N, N-dimethylethanolamine.
5. The two-component elastic coating material according to claim 1, wherein the defoaming agent is a silicone-based defoaming agent; and/or
The dispersant is a high molecular weight block copolymer dispersant.
6. The two-component elastic coating according to claim 1, wherein the film-forming aid is a mixture of dipropylene glycol methyl ether and dipropylene glycol butyl ether in a mass ratio of 2 to 4; and/or
The thickening agent is an alkali swelling association type thickening agent;
the cosolvent is propylene glycol monomethyl ether acetate.
7. A preparation method of a two-component elastic coating is characterized by at least comprising the following steps:
step a, weighing the components according to the design proportion of the double-component elastic coating of any one of claims 1-6, uniformly stirring the weighed dispersant, 40-60wt% of defoamer, 40-60wt% of pH regulator, nano-silver, lignocellulose/expandable graphite composite material, organic silicone powder, anion powder, flame retardant, gas-phase silicon dioxide, pigment and 40-60wt% of deionized water, and grinding the mixture until the fineness is less than or equal to 30 mu m to obtain a first mixed material;
b, adding the weighed aqueous polyurethane dispersion into the first mixed material, uniformly stirring, then sequentially adding the weighed film-forming aid, the rest of pH regulator, the rest of defoaming agent, the rest of deionized water, the hand feeling aid and the base material wetting agent, uniformly mixing, adding the thickening agent, and adjusting the viscosity of the coating 4 cup at 25 ℃ to 85-100S to obtain a component A;
step c, uniformly mixing the weighed water-based isocyanate curing agent and cosolvent to obtain a component B;
and d, mixing the component A and the component B according to the designed proportion to obtain the double-component elastic coating.
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| CN111732885B (en) * | 2020-08-24 | 2020-12-29 | 广东顺德德图新材料有限公司 | Waterborne elastic polyurethane flame-retardant coating and preparation method thereof |
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| CN101104752A (en) * | 2007-09-10 | 2008-01-16 | 中国人民解放军总后勤部军需装备研究所 | Water-proof moisture-permeation coating agent composition and application thereof |
| CN102585678A (en) * | 2011-12-29 | 2012-07-18 | 深圳市乐普泰科技有限公司 | Antistatic waterborne polyurethane coating and preparation method thereof |
| CN105153906A (en) * | 2015-09-07 | 2015-12-16 | 济南清纳材料科技有限公司 | Water-based polyurethane functional coating material and preparation method thereof |
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| CN101104752A (en) * | 2007-09-10 | 2008-01-16 | 中国人民解放军总后勤部军需装备研究所 | Water-proof moisture-permeation coating agent composition and application thereof |
| CN102585678A (en) * | 2011-12-29 | 2012-07-18 | 深圳市乐普泰科技有限公司 | Antistatic waterborne polyurethane coating and preparation method thereof |
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