CN114437622A - Single-component solvent-free polyurethane coating and preparation method thereof - Google Patents
Single-component solvent-free 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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- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/4288—Polycondensates having carboxylic or carbonic ester groups in the main chain modified by higher fatty oils or their acids or by resin acids
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- C08G18/6666—Compounds of group C08G18/48 or C08G18/52
- C08G18/667—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
- C08G18/6681—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/32 or C08G18/3271 and/or polyamines of C08G18/38
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- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/46—Polyesters chemically modified by esterification
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- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/52—Polycarboxylic acids or polyhydroxy compounds in which at least one of the two components contains aliphatic unsaturation
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- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/66—Polyesters containing oxygen in the form of ether groups
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
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- C08K2003/265—Calcium, strontium or barium carbonate
Abstract
The application relates to the technical field of coatings, in particular to a single-component solvent-free polyurethane coating and a preparation method thereof. The single-component solvent-free polyurethane coating comprises the following raw materials in parts by weight: 9-14 parts of castor oil resin, 32-45 parts of polyether polyol, 5-15 parts of isocyanate, 0.4-1.8 parts of latent curing agent, 5-15 parts of talcum powder and 10-15 parts of calcium carbonate; the castor oil resin is prepared by mixing dicarboxylic acid, polyhydric alcohol and castor oil; the preparation method comprises the following steps: mixing polyether polyol, talcum powder, calcium carbonate and other auxiliaries, and then dehydrating to obtain a mixture A; adding castor oil resin and isocyanate into the mixture A, and carrying out heat preservation reaction to obtain a mixture B; and adding the latent curing agent into the mixture B, and stirring and mixing to obtain the single-component solvent-free polyurethane coating. The single-component solvent-free polyurethane coating has the advantages of low viscosity and VOC content and high bonding strength.
Description
Technical Field
The application relates to the technical field of coatings, in particular to a single-component solvent-free polyurethane coating and a preparation method thereof.
Background
The polyurethane waterproof coating has the characteristics of high strength, good extensibility, corrosion resistance and the like, is widely accepted and applied in the domestic and foreign building waterproof industry, and the yield is increased year by year. The polyurethane waterproof coating has single-component and double-component components, and compared with the double-component polyurethane waterproof coating, the single-component polyurethane waterproof coating has no metering error in construction, can be used after being opened, is easy to construct, has wide application range, and has larger and larger use amount in recent years.
However, the performance of the two-component polyurethane waterproof coating is not easily achieved due to the one-component polyurethane waterproof coating. Therefore, when the one-component polyurethane waterproof coating is prepared, the molecular weight of the prepolymer is required to be higher, so that the viscosity of the one-component polyurethane waterproof coating is higher. At present, in order to meet the requirements of construction application, a certain amount of organic solvent is required to be added to adjust the viscosity of the single-component polyurethane waterproof coating, so that the pollution of volatile organic compounds is caused.
With the increasing national requirements for environmental protection, the control of VOC content is becoming more strict, so that a low-solvent or solvent-free polyurethane waterproof coating is urgently needed.
Disclosure of Invention
In order to reduce the VOC content of the single-component solvent-free polyurethane coating, the application provides the single-component solvent-free polyurethane coating and a preparation method thereof.
The technical principle of the application is as follows: after the single-component solvent-free polyurethane coating is constructed, the latent curing agent firstly reacts with water molecules in the air to generate primary amine, and the primary amine further reacts with castor oil resin, polyether polyol and isocyanate to be cured and formed into a film. On one hand, as no carbon dioxide gas is generated in the film forming process, the foaming problem of the single-component solvent-free polyurethane coating during crosslinking and curing can be reduced, and the flatness of the surface of a paint film after the coating is formed into the film is improved. On the other hand, the castor oil resin is introduced into the solvent-free polyurethane coating, so that the crosslinking density of the obtained single-component solvent-free polyurethane coating during crosslinking and curing is reduced, and the effect of reducing the viscosity of the single-component solvent-free polyurethane coating is achieved. Therefore, in the total raw materials for preparing the single-component solvent-free polyurethane coating, the use of organic solvents is reduced, the VOC content is reduced, and the environmental protection performance is improved. Meanwhile, the obtained single-component solvent-free polyurethane coating has low viscosity and good wetting capacity on a base material, so that the bonding strength with the base material is improved.
The technical scheme of the application is as follows:
in a first aspect, the present application provides a single-component solvent-free polyurethane coating, which adopts the following technical scheme:
a single-component solvent-free polyurethane coating comprises the following raw materials in parts by weight:
9-14 parts of castor oil resin;
32-45 parts of polyether polyol;
5-15 parts of isocyanate;
0.4-1.8 parts of latent curing agent;
5-15 parts of talcum powder;
10-15 parts of calcium carbonate;
1-2 parts of other auxiliary agents;
the castor oil resin is prepared by mixing dicarboxylic acid, polyalcohol and castor oil.
By adopting the technical scheme, the castor oil is a natural vegetable oil polyalcohol containing a plurality of hydroxyl groups, and has the characteristics of difficult oxidation, high temperature resistance and low freezing point. The castor oil resin prepared by mixing dicarboxylic acid, polyhydric alcohol and castor oil has low viscosity. Therefore, the castor oil modified resin with lower viscosity is used for being mixed with other raw materials such as polyether polyol, isocyanate and the like to prepare the single-component solvent-free polyurethane coating, so that the crosslinking density of the castor oil resin and the polyether polyol during the curing reaction can be reduced, and the viscosity of the obtained single-component solvent-free polyurethane coating can be reduced. Therefore, the obtained single-component solvent-free polyurethane coating does not contain solvent, and has the characteristics of low VOC content, good environmental protection performance and high bonding strength.
Preferably, the castor oil resin is prepared by mixing dicarboxylic acid, polyalcohol and castor oil according to the weight ratio of (0.07-0.09): 0.09-0.12): 1.
By adopting the technical scheme, the castor oil resin obtained by the reaction in the proportion has lower viscosity, the hydroxyl value is 300-500mgKOH/g, the reduction effect on the viscosity of the obtained single-component solvent-free polyurethane coating is better, and the bonding strength of the obtained coating can be improved.
Preferably, the hydroxyl value of the castor oil modified tree is 300-500 mgKOH/g.
Preferably, in the castor oil resin, the polyol is one or both of allyl alcohol and pentaerythritol.
By adopting the technical scheme, the castor oil resin prepared by adopting one or two of allyl alcohol and pentaerythritol has a stable hydroxyl value within the range of 300-500mgKOH/g, which is beneficial to reducing the viscosity of the obtained single-component solvent-free polyurethane coating, thereby reducing the VOC content of the single-component solvent-free polyurethane coating and improving the bonding strength of the single-component solvent-free polyurethane coating.
Preferably, the polyalcohol is composed of allyl alcohol and pentaerythritol mixed according to the weight ratio of 1 (1.6-2.2).
By adopting the technical scheme, the polyol obtained by mixing allyl alcohol and pentaerythritol according to the weight ratio has higher reaction efficiency with castor oil and dicarboxylic acid, and the viscosity of the obtained castor oil resin is lower, so that the viscosity of the obtained single-component solvent-free polyurethane coating is favorably reduced, and the bonding strength of the single-component solvent-free polyurethane coating is improved.
Preferably, the castor oil and the polyol are stirred and mixed for 2-3h under the conditions of a nitrogen environment and 250 ℃ at 200-.
By adopting the technical scheme, in the preparation process of the castor oil resin, the mixed system of the castor oil and the polyol is obtained by raising the temperature. Then, when the dicarboxylic acid is added for reaction, the viscosity of the obtained castor oil resin is favorably reduced by reducing the temperature of a reaction system twice, so that the viscosity of the obtained single-component solvent-free polyurethane coating is favorably reduced, and the bonding strength of the single-component solvent-free polyurethane coating is improved.
Preferably, the polyether polyol is one or two of polyether N220 and polyether 330N.
By adopting the technical scheme, the polyether polyol is compounded by adopting one or two of difunctional polyether N220 and trifunctional polyether 330N, and the obtained polyether polyol is stable in reaction with the castor oil resin. Therefore, the crosslinking density of polyether polyol and castor oil resin can be reduced, the viscosity of the obtained single-component solvent-free polyurethane coating is reduced, and the bonding strength of the single-component solvent-free polyurethane coating is improved. Meanwhile, the waterproof capability of the obtained single-component solvent-free polyurethane coating can be improved.
Preferably, the latent curing agent is an amine latent curing agent.
By adopting the technical scheme, the amine latent curing agent can promote the reaction, curing and film forming of the castor oil resin, the polyether glycol and the isocyanate, and the bonding strength and the waterproof capability of the obtained single-component solvent-free polyurethane coating are improved.
In a second aspect, the present application provides a method for preparing a single-component solvent-free polyurethane coating, which adopts the following technical scheme:
a preparation method of a single-component solvent-free polyurethane coating comprises the following steps:
s1: mixing polyether polyol, talcum powder, calcium carbonate and other auxiliary agents, and dehydrating for 2-3h at the temperature of 100-;
s2: adding castor oil resin and isocyanate into a mixture A at the temperature of 80-90 ℃, keeping the temperature for reaction for 2-3h, and continuing to react for 0.5-1h to obtain a mixture B;
s3: and adding the latent curing agent into the mixture B at the temperature of 50-60 ℃, and stirring and mixing for 0.3-0.6h to obtain the single-component solvent-free polyurethane coating.
By adopting the technical scheme, the polyether polyol and other auxiliaries are dehydrated, so that the dehydration effect of the polyether polyol and other auxiliaries is improved. Therefore, the influence of water on the reaction of the polyether polyol and the castor oil resin and the isocyanate is reduced. Meanwhile, the polyether polyol, the castor oil resin, the isocyanate and the light curing agent react under the conditions, so that the reaction activity is stable, the cross-linking density among the raw materials is favorably reduced, and the effects of reducing the viscosity of the single-component solvent-free polyurethane coating and improving the bonding strength of the single-component solvent-free polyurethane coating are achieved.
In summary, the present application has the following beneficial effects:
1. the castor oil resin prepared by mixing the dicarboxylic acid, the polyol and the castor oil has lower viscosity, and can reduce the crosslinking density of raw materials such as polyether polyol, isocyanate and the like during reaction, so that the viscosity of the obtained coating is reduced, and the obtained coating has the characteristics of no solvent, low VOC content, good environmental protection performance and high bonding strength;
2. in the application, the polyhydric alcohol consisting of allyl alcohol and pentaerythritol is preferably adopted to prepare the castor oil resin, so that the viscosity of the obtained coating is low, and the coating is favorable for wetting a substrate, thereby improving the bonding property of the coating;
3. according to the method, the content of water in the obtained mixture A is reduced by controlling the temperature, the pressure and the time of dehydration, and then the mixture A is reacted with the castor oil resin and the isocyanate within a specific temperature and time, the conversion efficiency of raw materials in the reaction is high, the reaction can be carried out under the conditions, the crosslinking density among the raw materials can be controlled, the viscosity of the obtained coating is favorably reduced, and the bonding strength of the obtained coating is improved.
Detailed Description
The present application will be described in further detail with reference to examples.
The raw materials used in the examples of the present application are commercially available except for the following specific descriptions.
Castor oil, purchased from Guangzhou emperor chemical Co., Ltd, with a product number of CD 2020;
diethylene glycol, purchased from Nanjing Rongji chemical Co., Ltd, CAS for SH 1056-;
dispersant, purchased from Didoku, under the trade name Tego 755W;
defoamer, purchased nike chemical, brand BYK 011;
allyl alcohol, CAS is 107-18-6;
polyether N220 and polyether 330N were both purchased from Runcorka, Guangzhou, Inc., and were both of the Dow brand.
Calcium carbonate purchased from mineral processing ltd, zueda, lingshou county, with a mesh size of 600 mesh;
talcum powder, purchased from Lingxin mineral processing factory, Lingshou, with 1250 mesh.
The single-component solvent-free polyurethane coatings obtained in the examples and comparative examples of the present application were tested for viscosity, VOC content, water impermeability and adhesive strength, and the test criteria were as follows:
and (3) viscosity detection: according to a rotation method of GB/T10247-2008 viscosity detection method, the detection temperature is (23 +/-2) DEG C.
And (3) detecting the VOC content, the water impermeability and the bonding strength: according to GB _ T19250-2013 polyurethane waterproof paint.
Preparation examples of raw materials
Preparation example 1
A castor oil resin, the components and their corresponding weights are shown in Table 1, and is prepared by the following steps:
mixing castor oil and polyhydric alcohol, stirring and mixing for 2h at 220 ℃ in a nitrogen environment, adding dicarboxylic acid at 150 ℃, stirring and mixing for 0.5h, and stirring and mixing for 1h at 210 ℃ to obtain the castor oil resin.
The hydroxyl value of the castor oil resin is 200mgKOH/g through detection.
Preparation example 2
A castor oil resin, the components and their corresponding weights are shown in Table 1, and is prepared by the following steps:
mixing castor oil and polyhydric alcohol, stirring and mixing for 2h under the conditions of nitrogen atmosphere and 200 ℃, adding dicarboxylic acid at 180 ℃, stirring and mixing for 0.5h, and stirring and mixing for 1h at 150 ℃ to obtain the castor oil resin.
The hydroxyl value of the castor oil resin is 300mgKOH/g through detection.
Preparation examples 3 to 6
A castor oil resin was different from preparation example 2 in that each component and the corresponding weight thereof are shown in Table 1.
TABLE 1 Components and weights (kg) thereof in preparation examples 1-5
In the preparation examples of the present application, only polyols, which are composed of allyl alcohol and pentaerythritol in a weight ratio of 1:1.6, are briefly described. Since the polyol obtained from allyl alcohol and pentaerythritol in the weight ratios defined herein has approximately the same effect on the hydroxyl number of the castor oil resin, the resulting castor oil resin hydroxyl number is within 400-500 mgKOH/g. Thus, the use of polyols made up of allyl alcohol and pentaerythritol in other weight ratios herein is not affected.
Preparation example 8
A castor oil resin which is different from preparation example 6 in that it is the same as preparation example 6 except that the procedure for preparing the castor oil resin is different.
The preparation steps of the castor oil resin are as follows:
mixing castor oil and polyol, stirring and mixing for 3 hours at the temperature of 250 ℃ in a nitrogen environment, adding dicarboxylic acid at the temperature of 190 ℃, stirring and mixing for 1 hour, and stirring and mixing for 3 hours at the temperature of 170 ℃ to obtain the castor oil resin.
Preparation example 9
A castor oil resin which is different from preparation example 6 in that it is the same as preparation example 6 except that the procedure for preparing the castor oil resin is different.
The preparation steps of the castor oil resin are as follows:
mixing castor oil and polyhydric alcohol, stirring and mixing for 4h at the temperature of 260 ℃ in a nitrogen environment, adding dicarboxylic acid at the temperature of 200 ℃, stirring and mixing for 1.5h, and stirring and mixing for 3.5h at the temperature of 180 ℃ to obtain the castor oil resin.
Examples
Example 1
A one-component solvent-free polyurethane coating, the components and their respective weights are shown in Table 2, and is prepared by the following steps:
s1: mixing polyether polyol, talcum powder, calcium carbonate and other auxiliary agents, and dehydrating for 2 hours at 100 ℃ and (-0.10) MPa to obtain a mixture A;
s2: adding castor oil resin and isocyanate into a mixture A at 80 ℃, keeping the temperature for reaction for 2 hours, and continuing to react for 0.5 hour to obtain a mixture B;
s3: and adding the latent curing agent into the mixture B at 50 ℃, and stirring and mixing for 0.3h to obtain the single-component solvent-free polyurethane coating.
In this example, the castor oil resin obtained in preparation example 1 was used.
In this example, the polyether polyol is polyether N220.
The latent curing agent is curing agent TP830, which is purchased from Wuhan Hua Bizhike Biotech limited company, and the equivalent of active hydroxyl after decomposition is 180.
Other auxiliary agents are defoaming agent BYK011 and dispersing agent Tego 755W.
Examples 2 to 3
A one-component, solvent-free polyurethane coating, differing from example 1 in that the components and their respective weights are as shown in table 2.
TABLE 2 Components and weights (kg) of examples 1-2
The single-component solvent-free polyurethane coatings obtained in examples 1 to 3 of the present application were tested for viscosity, VOC content, water impermeability and adhesive strength, and the results are shown in the following table.
As can be seen from the above table, the single-component solvent-free polyurethane coating obtained in examples 1-3 has a viscosity of 7830-7890Mpa · s, a VOC content as low as 10-11g/L, 0.4MPa,120min, water impermeability and a bonding strength as high as 1.4MPa, and the VOC content, the water impermeability and the bonding strength are all superior to the standard values. Therefore, the single-component solvent-free polyurethane coating obtained by the method has the characteristics of no solvent, low VOC content, good environmental protection performance, high bonding strength and high waterproof performance.
Examples 4 to 11
A one-component solvent-free polyurethane coating was different from example 2 in that it was the same as example 2 except that a castor oil resin obtained in a different preparation example was used.
Castor oil resin the castor oil resin obtained in the following preparation example was used.
The single-component solvent-free polyurethane coatings obtained in examples 4 to 11 of the present application were tested for viscosity, VOC content, water impermeability and adhesive strength, and the results are shown in the following table.
As can be seen from the above table, the single-component solvent-free polyurethane coating obtained in examples 4-11 has a viscosity of 7215-7950Mpa · s, a VOC content as low as 7-10g/L, 0.4-0.5MPa,120min, water impermeability and a bonding strength as high as 1.4-1.6 MPa.
The one-component solvent-free polyurethane coatings obtained according to examples 4 to 7 have a viscosity which is reduced by a relative amount of 1.60 to 3.84% and a bonding strength which is increased by a relative amount of 7.14% in comparison with the one-component solvent-free polyurethane coating obtained according to example 2. Therefore, the castor oil resin is adopted in the total raw materials of the single-component solvent-free polyurethane coating and is prepared by mixing dicarboxylic acid, polyol and castor oil according to the weight ratio of (0.07-0.09): 0.09-0.12):1, wherein when the polyol is allyl alcohol or pentaerythritol, the viscosity of the obtained single-component solvent-free polyurethane coating can be reduced, and the bonding strength of the single-component solvent-free polyurethane coating can be improved.
The one-component solvent-free polyurethane coating obtained according to example 8 has a viscosity which is reduced by 8.16%, a water impermeability which is increased by 25% and a bonding strength which is increased by 14.29% in comparison with the one-component solvent-free polyurethane coating obtained according to example 2. Therefore, the castor oil resin prepared by the polyol mixed by the allyl alcohol and the pentaerythritol according to the weight ratio of 1 (1.6-2.2) is adopted in the total raw materials of the single-component solvent-free polyurethane coating, so that the viscosity of the obtained single-component solvent-free polyurethane coating can be reduced, and the waterproof performance and the bonding strength of the single-component solvent-free polyurethane coating are improved.
The one-component solvent-free polyurethane coating obtained according to example 11 has a viscosity which is increased by 10.19%, a water impermeability which is reduced by 20% and a bonding strength which is reduced by 12.5% in comparison with the one-component solvent-free polyurethane coating obtained according to example 8. Thus, the castor oil resin used in the total raw materials of the single-component solvent-free polyurethane coating is prepared by the following steps: stirring and mixing castor oil and polyol for 2-3h under the conditions of nitrogen environment and 250 ℃ at 200-.
Example 12
A one-component solvent-free polyurethane coating material was prepared in the same manner as in example 8 except that an equal amount of LH-104 was used in place of TP 830. Wherein, the curing agent LH-104 is purchased from Suzhou non brother new material science and technology company Limited, and the amine equivalent is 140-145.
Example 13
A one-component solvent-free polyurethane coating material was prepared in the same manner as in example 8 except that the curing agent TP830 was replaced with the same amount of the curing agent XY-401 as in example 8. Wherein, the curing agent XY-401 is purchased from Biotechnology Limited of Syzygium, Wuhanhua, and has an amine equivalent of 142-144.
Example 14
A one-component solvent-free polyurethane coating material was different from that of example 12 in that it was the same as example 12 except that polyether polyol was composed of 19.25kg of polyether N220 and 19.25kg of polyether 330N mixed together.
Example 15
A one-component solvent-free polyurethane coating, which is different from example 14 in that it is the same as example 14 except that the preparation process of the one-component solvent-free polyurethane coating is different.
The preparation steps of the single-component solvent-free polyurethane coating are as follows:
s1: mixing polyether polyol, talcum powder, calcium carbonate and other auxiliary agents, and dehydrating for 3h at 120 ℃ and (-0.08) MPa to obtain a mixture A;
s2: adding castor oil resin and isocyanate into a mixture A at 90 ℃, keeping the temperature for reaction for 3 hours, and continuing to react for 1 hour to obtain a mixture B;
s3: and adding the latent curing agent into the mixture B at 60 ℃, and stirring and mixing for 0.6h to obtain the single-component solvent-free polyurethane coating.
The single-component solvent-free polyurethane coatings obtained in examples 12 to 15 of the present application were tested for viscosity, VOC content, water impermeability and adhesive strength, and the results are shown in the following table.
As can be seen from the above table, the one-component solvent-free polyurethane coatings obtained in examples 12-15 have a viscosity of 6900-7000Mpa · s, a VOC content as low as 6g/L, 0.6-0.7MPa,120min, water impermeability and a bonding strength as high as 1.6-1.7 MPa.
The one-component solvent-free polyurethane coating obtained according to example 12 has a viscosity which is reduced by 2.98%, a water impermeability which is increased by 20% and a bonding strength which is increased by 6.25% in comparison with the one-component solvent-free polyurethane coating obtained according to example 8. Therefore, the latent curing agent is used as the amine latent curing agent in the total raw materials of the single-component solvent-free polyurethane coating, and when the amine equivalent is 140-145, the viscosity of the obtained single-component solvent-free polyurethane coating can be reduced, and the impermeability and the bonding strength of the obtained single-component solvent-free polyurethane coating are improved.
The one-component solvent-free polyurethane coating obtained according to example 14 has a viscosity which is reduced by 3.19%, a water impermeability which is increased by 40% and a bonding strength which is increased by 6.25% in comparison with the one-component solvent-free polyurethane coating obtained according to example 8. Therefore, the polyether polyol formed by mixing polyether N220 and polyether 330N is adopted in the total raw materials of the single-component solvent-free polyurethane coating, so that the viscosity of the obtained single-component solvent-free polyurethane coating can be reduced, and the water impermeability and the bonding strength of the obtained single-component solvent-free polyurethane coating are improved.
Comparative example
Comparative example 1
A one-component solvent-free polyurethane coating, which is different from example 15 in that it is the same as example 15 except that it does not contain castor oil resin.
Comparative example 2
A one-component solvent-free polyurethane coating, which differs from example 15 in that it is the same as example 15 except that the same amount of resin is used instead of castor oil resin. Wherein the resin is prepared by mixing 1.4kg of dicarboxylic acid and 1.7kg of polyhydric alcohol, wherein the polyhydric alcohol is prepared by mixing 0.46kg of allyl alcohol and 0.74kg of pentaerythritol.
The preparation steps of the resin are as follows: stirring and mixing the polyhydric alcohol for 2 hours at 200 ℃ in a nitrogen environment, adding the dicarboxylic acid at 180 ℃, stirring and mixing for 0.5 hour, and stirring and mixing for 1 hour at 150 ℃ to obtain the resin.
The hydroxyl value of the resin is detected to be 160 mgKOH/g.
Comparative example 3
A one-component solvent-free polyurethane coating, which differs from example 15 in that it is the same as example 15 except that an equal amount of epoxy resin is used instead of castor oil resin.
The single-component solvent-free polyurethane coatings obtained in comparative examples 1-3 were tested for viscosity, VOC content, water impermeability and adhesive strength, and the test results are shown in the following table.
As can be seen from the above table, the one-component solvent-free polyurethane coating obtained in comparative examples 1-3 has a viscosity of up to 11540-22500Mpa · s, a VOC content of as low as 8-14g/L, 0.3MPa,120min, water impermeability and a bonding strength of 1.2-1.3 MPa.
The one-component solvent-free polyurethane coatings obtained according to comparative examples 1 to 3 have a viscosity which is relatively increased by 67.25 to 226.09%, a water impermeability which is relatively reduced by 23.53 to 29.41%, and a cohesive strength which is relatively reduced by 23.55 to 29.41% compared with the one-component solvent-free polyurethane coating obtained according to example 15. Thus, the single-component solvent-free polyurethane coating obtained by the method has lower viscosity and VOC content and higher water impermeability and bonding strength.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (9)
1. The single-component solvent-free polyurethane coating is characterized by comprising the following raw materials in parts by weight:
9-14 parts of castor oil resin;
32-45 parts of polyether polyol;
5-15 parts of isocyanate;
0.4-1.8 parts of latent curing agent;
5-15 parts of talcum powder;
10-15 parts of calcium carbonate;
1-2 parts of other auxiliary agents;
the castor oil resin is prepared by mixing dicarboxylic acid, polyalcohol and castor oil.
2. The one-component solvent-free polyurethane coating of claim 1, wherein the castor oil resin is prepared by mixing dicarboxylic acid, polyol and castor oil in a weight ratio of (0.07-0.09): 0.09-0.12): 1.
3. The one-component solvent-free polyurethane coating of claim 2, wherein the polyol in the castor oil resin is one or both of allyl alcohol and pentaerythritol.
4. The one-component solvent-free polyurethane coating of claim 3, wherein the hydroxyl number of the castor oil-modified resin is 300-500 mgKOH/g.
5. The one-component solvent-free polyurethane coating according to claim 3, wherein the polyol is composed of allyl alcohol and pentaerythritol mixed in a weight ratio of 1 (1.6-2.2).
6. The one-component solvent-free polyurethane coating of claim 1, wherein the castor oil resin is prepared by the steps of: stirring and mixing castor oil and polyhydric alcohol for 2-3h under the conditions of nitrogen environment and 250 ℃ at 200-.
7. The one-component solvent-free polyurethane coating of claim 1, wherein the polyether polyol is one or both of polyether N220 and polyether 330N.
8. The one-component solvent-free polyurethane coating of claim 1, wherein the latent curing agent is an amine latent curing agent.
9. A method for preparing a one-component solvent-free polyurethane coating according to any one of claims 1 to 8, comprising the steps of:
s1: mixing polyether polyol, talcum powder, calcium carbonate and other auxiliary agents, and dehydrating for 2-3h at the temperature of 100-;
s2: adding castor oil resin and isocyanate into a mixture A at the temperature of 80-90 ℃, keeping the temperature for reaction for 2-3h, and continuing to react for 0.5-1h to obtain a mixture B;
s3: and adding the latent curing agent into the mixture B at the temperature of 50-60 ℃, and stirring and mixing for 0.3-0.6h to obtain the single-component solvent-free polyurethane coating.
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