A PU primer for glass fiber reinforced plastic materials, a preparation method and application thereof

Abstract

This invention discloses a PU primer for fiberglass reinforced plastic (FRP) materials, its preparation method, and its application, belonging to the field of coating technology. The PU primer provided by this invention consists of component A, component B, and component C. The raw materials for component A, by weight, include: 30-63 parts hydroxyl acrylic resin; 2-5 parts blown castor oil; 5-10 parts resin-free black paste; the weight ratio of hydroxyl acrylic resin to blown castor oil is 6-30:1. The raw materials for component B include: 30-50 parts butyl acetate; 20-30 parts HDI trimer; 30-40 parts isocyanate prepolymer. The raw materials for component C include: 10-30 parts xylene; 20-30 parts butyl acetate; 40-45 parts propylene glycol methyl ether acetate; and 10-15 parts dimethyl carbonate. The PU primer provided by this invention can effectively improve its performance on FRP surfaces. This invention also provides a preparation method and application of the above-mentioned PU primer.

Description

Technical Field

[0001] This invention relates to the field of coating technology, and in particular to a PU primer for fiberglass materials, its preparation method, and its application. Background Technology

[0002] With the increasing variety and sophistication of home furnishing and furniture products, PVC and fiberglass furniture, with their numerous advantages such as waterproofing, moisture resistance, insect resistance, and the ability to be processed into curved shapes and handicrafts, are highly favored by consumers. Therefore, companies that manufacture PVC and fiberglass furniture have high requirements for the primer products used in coating, in order to meet the needs of PVC and fiberglass for high adhesion, coverage, flexibility, and other aspects of primer and paint film.

[0003] Polyurethane primer (PU primer) is a commonly used primer for fiberglass surfaces, but it has problems such as poor adhesion, poor hiding power, and poor smoothness. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a PU primer for fiberglass materials, which can effectively improve the adhesion, hiding power, and surface smoothness of the obtained PU primer on the fiberglass surface.

[0005] The present invention also provides a method for preparing the above-mentioned PU primer.

[0006] The present invention also provides the application of the above-mentioned PU primer.

[0007] According to an embodiment of the first aspect of the present invention, a PU primer for fiberglass materials is provided, the PU primer being composed of component A, component B and component C;

[0008] The raw materials for preparing component A, by weight, include:

[0009] 30-63 parts of hydroxyl acrylic resin;

[0010] Blow 2-5 parts of castor oil;

[0011] 5-10 parts of resin-free black paste;

[0012] The weight ratio of the hydroxyl acrylic resin to blown castor oil is 6 to 30:1;

[0013] The raw materials for preparing component B, by weight, include:

[0014] 30-50 parts of butyl acetate;

[0015] 20-30 parts of HDI trimer;

[0016] 30-40 parts of isocyanate prepolymer;

[0017] The raw materials for preparing component C, by weight, include:

[0018]

[0019]

[0020] The PU primer according to embodiments of the present invention has at least the following beneficial effects:

[0021] The PU primer provided by this invention consists of three components, which further improves the anti-settling performance of the obtained PU primer compared with the traditional two-component primer (equivalent to the diluent of component C being distributed in component A and component B).

[0022] The PU primer provided by this invention contains environmentally friendly solvents in both component B and component C, which are free of heavily polluting solvents such as benzene and formaldehyde. Furthermore, there is a significant synergistic effect between the solvents, and the combination of their evaporation rates can significantly accelerate the film formation, curing, and smoothness of the obtained PU primer, prevent leveling issues during construction, and improve the efficiency of processing and construction.

[0023] The PU primer provided by this invention uses hydroxyl acrylic resin, blown castor oil, resin-free black paste, HDI trimer, and isocyanate prepolymer in combination. The hydroxyl acrylic resin exhibits advantages in water resistance, high temperature resistance, and strong adhesion. Blown castor oil significantly improves the flexibility of the resulting PU primer. The paint film obtained through the synergistic interaction of these raw materials possesses excellent water resistance, high temperature resistance, adhesion, hiding power, and flexibility. It should be noted that the synergistic effect of the HDI trimer and isocyanate prepolymer, as well as the synergistic effect of their dosages, can effectively optimize the degree of crosslinking after film formation and the molecular weight of the polymerized components. This results in a paint film with excellent adhesion, scratch resistance, and flexibility. Therefore, the obtained PU primer exhibits excellent surface performance on substrates such as PVC and fiberglass.

[0024] According to some embodiments of the present invention, the weight ratio of component A to component B is 100:30 to 50.

[0025] According to some embodiments of the present invention, the weight ratio of component A to component B is 100:35 to 45. For example, it can be approximately 100:40.

[0026] According to some embodiments of the present invention, the weight ratio of component A to component C is 100:30 to 50.

[0027] According to some embodiments of the present invention, the weight ratio of component A to component C is 100:35 to 45. For example, it can be approximately 100:40.

[0028] According to some embodiments of the present invention, the raw materials for preparing component A, by weight, include:

[0029] 40-50 parts of hydroxyl acrylic resin;

[0030] Blow 3-4 parts of castor oil;

[0031] 6-9 parts of resin-free black paste.

[0032] According to some embodiments of the present invention, the weight ratio of the hydroxyl acrylic resin to blown castor oil is 10 to 20:1; specifically, it can be about 13:1, 14:1, 15:1 or about 16:1.

[0033] According to some embodiments of the present invention, the raw materials for preparing component A, by weight, include:

[0034] 45 parts of hydroxyl acrylic resin;

[0035] Blow 3.5 parts of castor oil;

[0036] 7.5 parts of resin-free black paste.

[0037] According to some embodiments of the present invention, the raw materials for preparing component A, by weight, further include:

[0038]

[0039] The weight ratio of the resin-free black paste to the dispersant is 5-10:0.1-1.

[0040] That is, for every 5 to 10 parts of resin-free black paste, use the above-mentioned parts by weight of dispersant and other excipients.

[0041] According to some embodiments of the present invention, the raw materials for preparing component A, by weight, include:

[0042]

[0043] Therefore, the synergistic effect of talc, calcium carbonate, and resin-free black paste enhances the hiding power of the resulting PU primer. Furthermore, the dispersant shortens the dispersion time; the defoamer reduces the amount of bubbles generated during dispersion; silica improves the anti-settling properties of the resulting PU primer; talc improves the sanding performance of the resulting PU primer; calcium carbonate enhances the filling performance of the resulting PU primer; the leveling agent improves the leveling properties during spraying; and organotin compounds improve drying speed and curing rate. The synergistic effect of these raw materials significantly improves the overall performance of the resulting PU primer.

[0044] According to some embodiments of the present invention, the raw materials for preparing component B, by weight, include:

[0045] 35-45 parts of butyl acetate;

[0046] 22-28 parts of HDI trimer;

[0047] 32-38 parts of isocyanate prepolymer.

[0048] The HDI trimer enhances flexibility, and when combined with the isocyanate prepolymer, it can adjust the degree of crosslinking of the PU primer film, thereby determining adhesion, hardness, flexibility, environmental resistance, and other properties.

[0049] According to some embodiments of the present invention, the monomers of the isocyanate prepolymer include at least one of HDI and MDI.

[0050] According to some embodiments of the present invention, the viscosity of the isocyanate prepolymer at 25°C is 7000–12000 mPa·s.

[0051] According to some embodiments of the present invention, the raw materials for preparing component B, by weight, include:

[0052] 40 parts of butyl acetate;

[0053] 25 parts of HDI trimer;

[0054] 35 parts of isocyanate prepolymer.

[0055] According to some embodiments of the present invention, the raw materials for preparing component C, by weight, include:

[0056]

[0057] According to some embodiments of the present invention, the raw materials for preparing component C, by weight, include:

[0058]

[0059] According to an embodiment of a second aspect of the present invention, a method for preparing the aforementioned PU primer is provided, the method comprising the following steps:

[0060] S1. Mix the raw materials for preparing component A to obtain component A;

[0061] The raw materials for preparing component B are mixed to obtain component B;

[0062] The raw materials for preparing component C are mixed to obtain component C;

[0063] S2. Mix the components A, B, and C.

[0064] Since the preparation method adopts all the technical solutions of the PU primer in the above embodiments, it has at least all the beneficial effects brought about by the technical solutions in the above embodiments.

[0065] Furthermore, the preparation method provided by the present invention only requires simple mixing to apply the PU primer, making the preparation method simple, convenient, and highly applicable.

[0066] According to an embodiment of a third aspect of the present invention, the application of the PU primer described herein is provided in the fields of household goods and construction.

[0067] Since the application employs all the technical solutions of the PU primer described in the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments. That is, the product prepared from the PU primer has a longer service life and superior weather resistance.

[0068] Unless otherwise specified, the term "about" in this invention actually means that the error is allowed to be within ±2%, for example, about 100 is actually 100 ± 2% × 100.

[0069] Unless otherwise specified, "between" in this invention includes the number itself, for example, "between 2 and 3" includes the endpoint values ​​2 and 3.

[0070] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. Detailed Implementation

[0071] The following will describe the concept and technical effects of the present invention clearly and completely with reference to embodiments, so as to fully understand the purpose, features and effects of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the scope of protection of the present invention.

[0072] In the description of this invention, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0073] Unless otherwise specified, the specific implementation method is as follows:

[0074] The hydroxyl acrylic resin was purchased from Zhanxin, model number 1263.

[0075] The blown castor oil was purchased from Changchuan Chemical, grade 750.

[0076] The resin-free black pulp was purchased from Zhimu, model WH-BK7;

[0077] The dispersant was purchased from DIGIC, model number 655;

[0078] The defoamer was purchased from BYK Chemical, model number BYK141.

[0079] The silica was purchased from Cabot, model M-5;

[0080] The talc powder was purchased from Shenpeng, grade 800 mesh.

[0081] The calcium carbonate was purchased from Taidi, model TD-230.

[0082] The leveling agent was purchased from Tigo, and the leveling agent for hand feel was model 410.

[0083] Organotin was purchased from Samsung Chemical, model ST-12;

[0084] The HDI trimer was purchased from BASF, model H1100aP.

[0085] The isocyanate prepolymer was purchased from Covestro, model L-75;

[0086] The alkyd resin was purchased from Top, model A196T-BJ;

[0087] Coconut oil resin was purchased from Top, model A148.

[0088] The diluents, such as xylene, butyl acetate, propylene glycol methyl ether acetate, and dimethyl carbonate, were purchased commercially, and the platform from which they were purchased had almost no impact on the performance of the resulting PU primer.

[0089] Example 1

[0090] This example provides a PU primer, with specific formulations shown in Tables 1-4. The specific preparation process is as follows:

[0091] S1. Referring to Table 2, mix the raw materials for preparing component A to obtain component A;

[0092] Referring to Table 3, the raw materials for preparing component B are mixed to obtain component B;

[0093] Referring to Table 4, the raw materials for preparing component C are mixed to obtain component C;

[0094] S2. Referring to Table 1, mix the components A, B, and C obtained in step S1 to obtain the final product.

[0095] To verify the effect of the types and proportions of raw materials used in the preparation, this invention includes Examples 2-3 and Comparative Examples 1-3.

[0096] The differences between Examples 2-3, Comparative Examples 1-3, and Example 1 are as follows:

[0097] The composition of some of the raw materials used in the preparation varies, as shown in Tables 1 to 4.

[0098] Table 1 shows the proportions (parts by weight) of components A, B, and C in the examples and comparative examples.

[0099] Component A 100 100 100 100 100 100 Component B 30 50 40 40 40 30 Component C 30 50 40 40 40 30

[0100] Table 2 shows the raw material ratios (parts by weight) for the preparation of component A in the examples and comparative examples.

[0101]

[0102]

[0103] Table 3 shows the raw material ratios for the preparation of component B in the examples and comparative examples.

[0104] Butyl acetate 40 40 40 40 40 40 HDI trimer 30 20 25 60 25 30 isocyanate prepolymer 30 40 35 / 35 30

[0105] Table 4. Raw material ratios for the preparation of component C in the examples and comparative examples.

[0106] xylene 10 30 20 20 20 10 Butyl acetate 30 20 25 25 35 30 Propylene glycol methyl ether acetate 45 40 42.5 42.5 45 45 dimethyl carbonate 15 10 12.5 12.5 / 15

[0107] For comparison with the comparative examples, the present invention provides comparative examples 4-5; wherein, the difference between comparative examples 4-5 and the examples is that some of the raw materials used in the preparation of component A are different; the specific differences are shown in Table 5 (the parts not shown are the same).

[0108] Table 5. Some differences between Example 3 and Comparative Examples 4-5

[0109]

[0110] Test case

[0111] This example tested the performance of the PU primers obtained in the examples and comparative examples. Specifically, it tested hardness, water resistance, high-temperature resistance (dry heat resistance), adhesion, hiding power, flexibility, appearance, residue of harmful substances, and sandability. During the testing process, the PU primer was sprayed onto a 10mm thick fiberglass surface, dried, and cured before testing. The specific testing method was as follows:

[0112] Drying time: Determined according to national standard GB / T 1728-2020, method for determining the drying time of paint film and putty film.

[0113] Appearance properties: visual inspection;

[0114] Hardness: Refer to the national standard GB / T 6739-2006 Test for hardness of paint film by pencil method.

[0115] Water resistance: Tested according to national standard GB / T 1733-93, which specifies the test method for water resistance of paint film. The method used is the immersion test, with an immersion time of 48 hours. After immersion, the paint film is observed for any changes such as peeling or flaking.

[0116] High temperature resistance: Refer to national standard GB / T 23997-2009 Solvent-based polyurethane wood coatings for interior decoration and finishing. The test temperature is 90℃ (limited by the substrate, and the operating temperature of fiberglass generally does not exceed 90℃), and the holding time is 15 minutes; observe the appearance after removal.

[0117] Adhesion: Refer to the national standard GB / T 9286-2021 Cross-cut test for paint and varnish films.

[0118] Hiding power: Tested according to national standard GB 1726-1979, "Determination of Hiding Power of Coatings". The method used was spray coating. The test measured the dry film thickness required to completely cover the black and white checkered pattern.

[0119] Flexibility: Tested according to the national standard GB / T 1731-1993, "Determination of Flexibility of Coating Film". The substrate is made of tinplate. Grade 1 indicates almost no change in appearance; as the grade increases, the degree of coating film damage increases.

[0120] Abrasion resistance and polishability: tested in accordance with national standard GB / T23997-2009.

[0121] Hazardous substance residue: Refer to the national standard GB18581-2020 Test for limits of hazardous substances in solvent-based wood coatings for interior decoration and renovation materials. If it meets the requirements of GB18581-2020, it is considered qualified.

[0122] The test results are shown in Table 6.

[0123] Table 6. Performance of the PU primers obtained in the examples and comparative examples.

[0124]

[0125]

[0126] Based on the above test results, it can be seen that within the scope provided by the present invention, the obtained PU primer for fiberglass has advantages such as water resistance, high temperature resistance, adhesion, strong hiding power, high flexibility, and easy sanding, which can fully meet the performance requirements of fiberglass PU black base products.

[0127] Comparing Examples 1 to 3, it can be seen that within the scope provided by the present invention, changing the amount of raw materials used in preparation will lead to changes in related properties such as drying time. In fact, in actual tests, there are also differences in properties such as adhesion and flexibility. However, the grade data obtained by testing and rating according to national standard documents are relatively similar.

[0128] Comparing Example 1 and Comparative Example 1, it can be seen that if the isocyanate prepolymer is not included in component B, the synergistic effect between the HDI trimer and the isocyanate prepolymer cannot be exerted, and the adhesion, flexibility and abrasion resistance of the resulting PU primer decrease.

[0129] Comparing Example 1 and Comparative Example 2, it can be seen that if the type of solvent in component C is adjusted, the synergistic effect between the solvents cannot be effectively exerted. On the one hand, it will significantly affect the smoothness of the paint film obtained by preparing PU primer, and on the other hand, the drying process may affect properties such as adhesion.

[0130] Comparing Examples 1 and 3, it can be seen that if the ratio between hydroxyl acrylic resin and blown castor oil is not within the range required by the present invention, the synergistic effect between the film-forming materials cannot be effectively exerted, which will significantly affect the adhesion, flexibility and other related results.

[0131] Comparing Examples 1 and 4-5, it can be seen that in the PU primer provided by the present invention, there is a certain synergistic effect between the film-forming substance of component A (hydroxy acrylate + blown castor oil) and the resin-free black paste, which can significantly improve the overall performance of the obtained PU primer.

[0132] The embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A PU primer for fiberglass materials, characterized in that, The PU primer is composed of component A, component B, and component C; The raw materials for preparing component A, by weight, include: 30-63 parts of hydroxyl acrylic resin; Blow 2-5 parts of castor oil; 5-10 parts of resin-free black paste; Dispersant 0.1~1 part; Defoamer 0.1~1 part; Cyclohexanone 1-5 parts; 0.1 to 1 part of silicon dioxide; 20-25 parts talcum powder; 10-15 parts calcium carbonate; 1-2 parts of butyl acetate; Leveling agent 0.1~1 part; Organotin 0.1~1 part; 1-2 parts of propylene glycol methyl ether acetate; The weight ratio of the resin-free black paste to the dispersant is 5~10:0.1~1; The weight ratio of the hydroxyl acrylic resin to blown castor oil is 6~30:1; The raw materials for preparing component B, by weight, include: 30-50 parts of butyl acetate; 20-30 parts of HDI trimer; 30-40 parts of isocyanate prepolymer; The raw materials for preparing component C, by weight, include: 10-30 parts xylene; 20-30 parts of butyl acetate; 40-45 parts of propylene glycol methyl ether acetate; 10-15 parts of dimethyl carbonate.

2. The PU primer according to claim 1, characterized in that, The weight ratio of component A to component B is 100:30~50; and / or, the weight ratio of component A to component C is 100:30~50.

3. The PU primer according to claim 2, characterized in that, The weight ratio of component A to component B is 100:35~45; and / or, the weight ratio of component A to component C is 100:35~45.

4. The PU primer according to claim 1, characterized in that, The raw materials for preparing component A, by weight, include: 40-50 parts of hydroxyl acrylic resin; Blow 3-4 parts of castor oil; 6-9 parts of resin-free black paste.

5. The PU primer according to claim 1, characterized in that, The raw materials for preparing component B, by weight, include: 35-45 parts of butyl acetate; 22-28 parts of HDI trimer; 32-38 parts of isocyanate prepolymer.

6. The PU primer according to claim 1, characterized in that, The raw materials for preparing component C, by weight, include: 15-25 parts xylene; 22-28 parts of butyl acetate; 42-43 parts of propylene glycol methyl ether acetate; 12-13 parts of dimethyl carbonate.

7. The PU primer according to claim 1, characterized in that, The monomers of the isocyanate prepolymer include at least one of HDI, MDI and toluene diisocyanate.

8. A method for preparing a PU primer as described in any one of claims 1 to 7, characterized in that, The preparation method includes the following steps: S1. Mix the raw materials for preparing component A to obtain component A; The raw materials for preparing component B are mixed to obtain component B; The raw materials for preparing component C are mixed to obtain component C; S2. Mix the components A, B and C.

9. The application of a PU primer as described in any one of claims 1 to 7 in the fields of home furnishings and construction.

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