CN114736604A - High-solid-content DTM polyurethane coating and preparation method thereof - Google Patents
High-solid-content DTM polyurethane coating and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/64—Macromolecular compounds not provided for by groups C08G18/42 - C08G18/63
- C08G18/6415—Macromolecular compounds not provided for by groups C08G18/42 - C08G18/63 having nitrogen
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/67—Unsaturated compounds having active hydrogen
- C08G18/68—Unsaturated polyesters
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/47—Levelling agents
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/48—Stabilisers against degradation by oxygen, light or heat
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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Abstract
The invention discloses a high-solid-content DTM polyurethane coating and a preparation method thereof. The high-solid-content DTM polyurethane coating comprises a component A and a component B, wherein the component A comprises the following raw materials: polyaspartic acid ester, modified resin, a dispersing agent, a defoaming agent, a leveling agent, an ultraviolet light absorber, a pigment, a filler, a molecular sieve and a solvent, wherein the component B is a curing agent. The high-solid-content DTM polyurethane coating provided by the invention has the solid content of more than 80%, has the characteristic of high solid content, and can be used for constructing a metal substrate to obtain a film with the thickness of 100-150 mu m; meanwhile, the pot life of the coating can reach more than 45min, and the construction performance of the DTM coating is obviously improved.
Description
Technical Field
The invention belongs to the technical field of coatings, and particularly relates to a high-solid-content DTM polyurethane coating and a preparation method thereof.
Background
In the field of coating corrosion prevention of metal substrates, a matched spraying mode of primer, intermediate paint and finish paint is usually adopted, and the mode has a plurality of technical problems, such as low solid content of each layer of coating and thin film forming thickness; the film forming time is long, certain construction intervals exist among layers, and the adhesion among the layers is different, so that the film forming quality is poor, and the protection effect is difficult to play. Under the background, the DTM (direct to metal) coating which can be directly applied to the metal surface is produced at the end of life, and the DTM (direct to metal) coating can replace a multi-layer system of primer, intermediate paint and finish paint, so that the construction steps are reduced, the drying time is shortened, the spraying efficiency is greatly improved, and the cost is saved.
The pot life refers to the maximum time that the separately packaged coating components can be used after mixing. In a DTM coating system, when the viscosity of a DTM coating is increased by 50% compared with the viscosity when the DTM coating is initially prepared, the performance of the DTM coating is obviously unqualified, so the time for increasing the viscosity by 50% compared with the viscosity when the DTM coating is initially prepared is generally determined as the working life of the DTM coating, the working life of the DTM coating in the prior art is only about 20min, and the too short working life leads to the fact that the DTM coating can only be constructed by adopting a double-feed high-pressure airless sprayer, and the spraying time needs to be strictly controlled, so that the constructability of the DTM coating is seriously reduced, therefore, the DTM coating with the longer working life is developed, and the DTM coating has great significance for improving the constructability of the DTM coating and reducing the application difficulty of the DTM.
Disclosure of Invention
Aiming at the technical problem that the DTM coating is difficult to be widely applied due to the limitation of a spraying mode and spraying time caused by short service life of the DTM coating in the prior art, the invention provides the high-solid DTM polyurethane coating and the preparation method thereof, wherein the service life of the high-solid DTM polyurethane coating reaches more than 45min, the solid content reaches more than 80%, the film forming thickness is 100-150 mu m, the plate surface effect is good, and the application prospect is wide.
In order to achieve the purpose of the invention, the embodiment of the invention adopts the following technical scheme:
the high-solid-content DTM polyurethane coating comprises a component A and a component B, wherein the component A comprises the following raw materials in percentage by mass: 30-35% of polyaspartic acid ester, 18-23% of modified resin, 1-1.5% of dispersing agent, 0.2-0.6% of defoaming agent, 0.3-0.5% of flatting agent, 1-1.5% of ultraviolet absorber, 10-20% of pigment, 20-32% of filler, 3-5% of molecular sieve and 8-15% of solvent, wherein the component B is a curing agent, and the mass of the component B is 25-30% of the total mass of the component A; the modified resin in the component A is bio-based polyester modified polyol resin.
According to the high-solid-content DTM polyurethane coating provided by the invention, the bio-based polyester modified polyol resin is creatively introduced into the DTM polyurethane coating, the bio-based polyester modified polyol resin plays a significant role in prolonging the service life of the coating and improving the glossiness and the surface effect of the coating, the bio-based polyester modified polyol resin and the polyaspartic acid ester are used as main film forming substances, and the solid content of the DTM polyurethane coating prepared by adding pigments with specific contents, fillers, molecular sieves and solvents can reach more than 80% by matching with a dispersant, a defoamer, a leveling agent, an ultraviolet absorber and a curing agent with specific contents, so that the high-solid-content DTM polyurethane coating has the characteristic of high solid content, the thickness of a film obtained by one construction on a metal substrate can reach 100-150 mu m, and the paint film has good glossiness and surface effect; meanwhile, the pot life of the coating can reach more than 45min, and the construction performance of the DTM coating is obviously improved.
Preferably, the bio-based polyester modified polyol resin is castor oil polyester modified polyol resin, and the preparation method specifically comprises the following steps:
step 1: mixing castor oil, diethylene glycol and trimethylolpropane, heating to 215-225 ℃ under the protection of nitrogen, and reacting for 0.8-1.2 h under heat preservation;
and 2, step: and after the reaction is finished, reducing the temperature to be below 180 ℃, adding adipic acid and petroleum xylene, heating up and refluxing for 1.5-2 h, stirring and heating up to 245-250 ℃, carrying out heat preservation reaction until the acid value in the reaction system is less than or equal to 1(mgKOH/g), reducing the temperature to be below 60 ℃ after the latticed tube viscosity is 8-11 s (25 ℃), adding butyl acetate, and uniformly mixing to obtain the castor oil modified polyester polyol resin.
Preferably, the ratio of the amounts of castor oil, diethylene glycol, trimethylolpropane, adipic acid, petroleum xylene and butyl acetate is: 60-62: 6-7: 2.5-3: 9-10: 14-16: 4 to 6.
Preferably, the curing agent is a mixture of HDI trimer and isophorone diisocyanate, and the two are preferably in a mass ratio of: 4-6: 1.
the curing agent prepared by mixing HDI tripolymer and isophorone diisocyanate can obviously reduce the viscosity of the coating system, so that the DTM coating can be sprayed by high-pressure airless spraying, the problem that the DTM coating in the prior art can not be sprayed by high-pressure airless spraying due to high viscosity is solved, the spraying mode of the DTM coating is widened, and the application life of the DTM coating is further prolonged.
Preferably, the solvent is a mixture of ethylene glycol butyl ether acetate and tert-butyl acetate, and the preferable mass ratio is 1-2: 1.
the mixture of ethylene glycol butyl ether acetate and tert-butyl acetate can dissolve and uniformly mix the film forming substance, various auxiliaries and fillers in the scheme, so that the stable property of a paint film is ensured, certain contribution is made to the decorative property and the protective property of the paint film, in addition, esters and tert-butyl acetate do not contain substances harmful to the environment, and the VOC content of the paint can be obviously reduced.
Preferably, the ultraviolet absorber is a mixture of a benzotriazole ultraviolet absorber and a hindered amine stabilizer, and the preferable mass ratio is 1-2: 1.
preferably, the dispersant is a high molecular weight block copolymer with pigment affinic groups.
Preferably, the leveling agent is polyether modified dimethyl siloxane.
Preferably, the defoaming agent is a fluorosilicone modified polysiloxane or silicone type defoaming agent.
Preferably, the filler is at least one of barium sulfate, talcum powder, mica powder and zinc sulfate, the pigment is at least one of rutile titanium dioxide and Komesk KC red, and the molecular sieve is a 4A molecular sieve.
The invention also provides a preparation method of the high-solid-content DTM polyurethane coating, which comprises the following steps:
s1: weighing the raw materials according to the formula ratio, mixing the polyaspartic acid ester and the modified resin, sequentially adding the dispersing agent and the defoaming agent under the stirring state, and uniformly stirring at 500-600 r/min;
s2: adjusting the rotating speed to 600-800 r/min, adding pigment and filler, dispersing for 10-15 min at 800-1000 r/min, and then grinding until the fineness is less than or equal to 20 mu m;
s3: adding a flatting agent, an ultraviolet absorbent, a solvent and a molecular sieve, and stirring for 15min at a speed of 600-800 r/min to obtain a component A;
s4: weighing the curing agent according to the formula amount, uniformly stirring at 500-600 r/min to obtain a component B, and subpackaging the component A and the component B to obtain the high-solid-content DTM polyurethane coating.
Compared with the prior art, the preparation method of the high-solid-content DTM polyurethane coating provided by the invention has the advantages of simple process, environmental protection in operation aspect, and sub-packaging of the component A and the component B prepared in steps,
the high-solid-content DTM polyurethane coating can be prepared by simple mixing in the construction process, and the prepared high-solid-content DTM polyurethane coating has long service life and wide application 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.
For comparison, the materials used in the following examples and comparative examples were of the type indicated in Table 1.
TABLE 1
The bio-based polyester modified polyol resin in the table is castor oil polyester modified polyol resin, and the preparation method comprises the following steps:
step 1: mixing castor oil, diethylene glycol and trimethylolpropane, heating to 215-225 ℃ under the protection of nitrogen, and reacting for 1h under heat preservation;
and 2, step: and after the reaction is finished, reducing the temperature to be below 180 ℃, adding adipic acid, heating and refluxing for 1.5-2 h, stirring and heating to 245-250 ℃, carrying out heat preservation reaction until the acid value in the reaction system is less than or equal to 1(mgKOH/g), the viscosity of the latticed tube is 8-11 s (25 ℃), reducing the temperature to be below 60 ℃, adding butyl acetate, and uniformly mixing to obtain the castor oil modified polyester polyol resin.
Wherein, the raw material quality ratios of the modified resins in examples 1 to 5 are shown in the following table, and the modified resin in the comparative example is the same as the modified resin in example 1:
in the preparation process, the use ratio of the castor oil, the diglycol, the trimethylolpropane, the refined adipic acid, the petroleum xylene and the butyl acetate is as follows: 61.4: 6.56: 2.82: 9.22: 15: 5.
the following examples are intended to illustrate the invention in more detail.
Example 1
Examples 1 to 5 each provide a high-solid DTM polyurethane coating, which is composed of a component a and a component B, wherein the mass percentages of the raw materials in the component a are shown in table 2, and the mass percentages of the raw materials in the component B relative to the sum of the mass percentages of the component a are shown in table 3:
TABLE 2
TABLE 3
The preparation method of the high-solid DTM polyurethane coating provided in examples 1 to 5 specifically includes the following steps:
s1: weighing the raw materials according to the formula ratio, mixing the polyaspartic acid ester and the modified resin, sequentially adding the dispersing agent and the defoaming agent under the stirring state, and uniformly stirring at 500-600 r/min;
s2: adjusting the rotating speed to 600-800 r/min, adding pigment and filler, dispersing for 15min at 800-1000 r/min, and then grinding until the fineness is less than or equal to 20 mu m;
s3: adding a flatting agent, an ultraviolet absorbent, a solvent and a molecular sieve, and stirring for 15min at a speed of 600-800 r/min to obtain a component A;
s4: weighing the curing agent according to the formula amount, uniformly stirring at 500-600 r/min to obtain a component B, and subpackaging the component A and the component B to obtain the high-solid-content DTM polyurethane coating.
Comparative example 1
This comparative example provides a polyurethane coating having a composition comparable to example 1, except that the modified resin was replaced with an equal mass of Coxideo 670B polyester resin, the remaining ingredients and preparation method remaining the same as in example 1.
Comparative example 2
This comparative example provides a polyurethane coating having a composition comparable to example 1, except that the modified resin in component A was replaced with an equal mass of a basfsevermol 760 branched polyester polyol, and the remaining ingredients and method of preparation were consistent with example 1.
Comparative example 3
This comparative example provides a polyurethane coating having a composition comparable to example 1, except that bayer N3900 in the B-component curing agent was replaced with an equal mass of warfarin HT100 curing agent, and the remaining ingredients and method of preparation were consistent with example 1.
Comparative example 4
This comparative example provides a polyurethane coating having a composition comparable to example 1, except that bayer N3900 in the B-component curing agent was replaced with equal quality of asahi corporation TLA100 resin, the remaining ingredients and method of preparation remaining the same as in example 1.
Example of detection
The polyurethane coatings prepared in the examples and comparative examples were subjected to relevant performance tests in which:
the items detected by referring to GB30981-2020 Limit of harmful substances in industrial protective coating are as follows: non-volatile components, density, VOCs, heavy metals;
the items tested by referring to HG/T4757-2014 agricultural mechanical paint are as follows: moisture and heat resistance, water resistance and artificial weather aging resistance;
the items detected by referring to HG/T5368-2018 polyaspartic acid ester anticorrosive paint are as follows: pencil hardness, bending test, wear resistance, pot life;
items tested with reference to HG/T2454-2014 "solvent-borne polyurethane coating (two-component)" include: in-vessel condition, fineness, drying time, paint film appearance, gloss, impact resistance, cross cut test, adhesion (draw method), acid and alkali resistance, salt water resistance, and salt spray resistance.
The specific test results are shown in table 4 and table 5 below.
TABLE 4
TABLE 5
As can be seen from the data in the table above, the content of non-volatile substances in the high-solid-content DTM polyurethane coating provided by the invention is not less than 80%, the initial viscosity of the coating prepared by mixing the component A and the component B is low, the viscosity increasing rate is low, the pot life is more than 45min, the drying mode is self-drying, heating equipment is not needed, the drying time is fast, and the construction time can be greatly saved. Meanwhile, the adhesive force (drawing method) is more than or equal to 9, the adhesive force to the metal base material is good, the gloss is full, the adhesive force is more than 90 degrees at an angle of 20 degrees, and the decorative effect is good.
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 (10)
1. The high-solid-content DTM polyurethane coating is characterized by comprising a component A and a component B, wherein the component A comprises the following raw materials in percentage by mass: 30-35% of polyaspartic acid ester, 18-23% of modified resin, 1-1.5% of dispersing agent, 0.2-0.6% of defoaming agent, 0.3-0.5% of flatting agent, 1-1.5% of ultraviolet absorber, 10-20% of pigment, 20-32% of filler, 3-5% of molecular sieve and 8-15% of solvent, wherein the component B is a curing agent, and the mass of the component B is 25-30% of the total mass of the component A;
wherein the modified resin is bio-based polyester modified polyol resin.
2. The high-solid DTM polyurethane coating of claim 1, wherein the bio-based polyester-modified polyol resin is castor oil-modified polyester polyol resin, and the preparation method specifically comprises the following steps:
step 1: uniformly mixing castor oil, diethylene glycol and trimethylolpropane, heating to 215-225 ℃ under a protective atmosphere, and carrying out heat preservation reaction for 0.8-1.2 h;
step 2: and after the reaction is finished, reducing the temperature to be below 180 ℃, adding adipic acid and petroleum xylene, heating up and refluxing for 1.5-2 h, stirring and heating up to 245-250 ℃, keeping the temperature for reaction until the acid value in the reaction system is less than or equal to 1(mgKOH/g), reducing the temperature to be below 60 ℃ after the viscosity of the latticed tube is 8-11 s (25 ℃), adding butyl acetate, and uniformly mixing to obtain the castor oil modified polyester polyol resin.
3. The high solids DTM polyurethane coating of claim 1, wherein the curing agent is a mixture of HDI trimer and isophorone diisocyanate.
4. The high solids DTM polyurethane coating of claim 1, wherein the solvent is a mixture of butyl cellosolve acetate and t-butyl acetate.
5. The high solids DTM polyurethane coating of claim 1, wherein the ultraviolet light absorber is a mixture of a benzotriazole ultraviolet light absorber and a hindered amine stabilizer.
6. The high solids DTM polyurethane coating of claim 1, wherein the dispersant is a high molecular weight block copolymer with pigment affinic groups.
7. The high solids DTM polyurethane coating of claim 1, wherein the leveling agent is a polyether modified dimethyl siloxane.
8. The high solids DTM polyurethane coating of claim 1, wherein the defoamer is a fluorosilicone modified polysiloxane or silicone based defoamer.
9. The high solids DTM polyurethane coating of claim 1, wherein the filler is at least one of barium sulfate, talc, mica powder, and zinc sulfate; and/or
The pigment is at least one of rutile titanium dioxide and Komeis KC red; and/or
The molecular sieve is a 4A molecular sieve.
10. The method for preparing the high-solid DTM polyurethane coating of any one of claims 1 to 9, comprising the steps of:
s1: weighing the raw materials according to the formula ratio, mixing the polyaspartic acid ester with the modified resin, sequentially adding the dispersing agent and the defoaming agent under the stirring state, and uniformly stirring at 500-600 r/min;
s2: adjusting the rotating speed to 600-800 r/min, adding pigment and filler, dispersing for 10-15 min at 800-1000 r/min, and then grinding until the fineness is less than or equal to 20 mu m;
s3: adding a flatting agent, an ultraviolet absorbent, a solvent and a molecular sieve, and stirring at 600-800 r/min for 10-15 min to obtain the component A;
s4: weighing the curing agent according to the formula amount, uniformly stirring at 500-600 r/min to obtain the component B, and subpackaging the component A and the component B to obtain the high-solid-content DTM polyurethane coating.
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| CN115232286A (en) * | 2021-04-22 | 2022-10-25 | 深圳市优妮家新材料有限公司 | Bio-based aliphatic polyurethane composition and preparation method and application thereof |
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| JP2002317027A (en) * | 2001-04-19 | 2002-10-31 | Dainippon Ink & Chem Inc | Resin composition for urethane hard coating and coating material |
| CN108300276A (en) * | 2018-03-09 | 2018-07-20 | 广东达尔新型材料有限公司 | A kind of no-solvent polyurethane floor paint and preparation method thereof |
| CN112955513A (en) * | 2020-05-25 | 2021-06-11 | 厦门双瑞船舶涂料有限公司 | Solvent-free marine antifouling paint and preparation method thereof |
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| CN115232286A (en) * | 2021-04-22 | 2022-10-25 | 深圳市优妮家新材料有限公司 | Bio-based aliphatic polyurethane composition and preparation method and application thereof |
| CN115232286B (en) * | 2021-04-22 | 2023-09-26 | 深圳市优妮家新材料有限公司 | Bio-based aliphatic polyurethane composition and preparation method and application thereof |
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