An automotive windshield micro-crack repair fluid and its preparation method

Abstract

The present invention provides a micro-crack repair liquid for automotive windshields, which is prepared from raw materials comprising the following components: 30-35 parts by weight of trimethylolpropane formal acrylate monomer; 5-10 parts by weight of trimethylolpropane triacrylate monomer; 8-20 parts by weight of bifunctional aliphatic polyurethane acrylate; 20-35 parts by weight of hexafunctional aliphatic polyurethane acrylate; 4-6 parts by weight of photoinitiator; 4-8 parts by weight of coupling agent; 5-15 parts by weight of adhesion promoter. Compared with the prior art, the micro-crack repair liquid for automotive windshields provided by the present invention adopts specific components with specific contents to achieve good overall interaction. The cured coating film of the obtained micro-crack repair liquid for automotive windshields has good hardness, toughness and scratch resistance, and at the same time has good yellowing resistance, and has good adhesion to the glass substrate; and after the whole coating film is cured, it has good light transmittance, water resistance and alkali resistance, and has a perfect repair effect on the micro-cracks of automotive windshields.

Description

Technical Field

[0001] The present invention relates to the technical field of light-cured glass repair liquid, and more particularly to a car windshield micro-crack repair liquid and a preparation method thereof. Background Art

[0002] When a car is driving, it is inevitable that the windshield will be damaged due to stone impact, collision and other reasons. When the glass damage is not very serious, such as some small cracks, small stars, etc., replacing the windshield will increase the cost (from a few hundred yuan to tens of thousands of yuan). Secondly, replacing the windshield requires disassembly, glue scraping, positioning, glue injection and other processes, and the repair time is relatively long. In addition, the re-installed glass will be affected in terms of fit, firmness, sealing and sound insulation. However, the light-curing repair fluid is easy to apply (the repair can be completed within 10 to 30 minutes), low cost, and avoids waste of resources. The performance and appearance of the repaired windshield are not affected.

[0003] Light-curing repair fluid uses high-energy ultraviolet light as a curing energy source. The photoinitiator in the repair fluid absorbs the UV light to generate free radicals or cations, which trigger a chain polymerization reaction between oligomers and reactive diluent molecules, resulting in cross-linking and curing. The cured coating has excellent light transmittance, water resistance, alkali resistance, yellowing resistance, scratch resistance, and good adhesion to the glass surface. It can perfectly repair defects such as small cracks and small spots on windshields. Currently, this type of product is rare in the domestic market.

[0004] Therefore, providing a car windshield micro-crack repair liquid that can perfectly repair defects such as small cracks and small star holes in the windshield has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a micro-crack repair liquid for automobile windshields and a preparation method thereof. After the micro-crack repair liquid for automobile windshields provided by the present invention is cured, the coating film has good hardness, toughness and scratch resistance, and at the same time has good yellowing resistance and good adhesion to the glass substrate; and after the entire coating film is cured, it has good light transmittance (visible light transmittance) and water and alkali resistance; and perfect repairability.

[0006] The present invention provides a micro-crack repair liquid for automobile windshields, which is prepared from raw materials including the following components:

[0007] 30-35 parts by weight of No. 1 reactive diluent;

[0008] 5-10 parts by weight of No. 2 reactive diluent;

[0009] 8-20 parts by weight of No. 1 polyurethane acrylate;

[0010] 20 - 35 parts by weight of polyurethane acrylate No. 2;

[0011] 4 - 6 parts by weight of photoinitiator;

[0012] 4 - 8 parts by weight of coupling agent;

[0013] 5 - 15 parts by weight of adhesion promoter;

[0014] The No. 1 active diluent is trimethylolpropane formal acrylate monomer; the No. 2 active diluent is trimethylolpropane triacrylate monomer; the No. 1 polyurethane acrylate is a bifunctional aliphatic polyurethane acrylate; the No. 2 polyurethane acrylate is a hexafunctional aliphatic polyurethane acrylate.

[0015] Preferably, the photoinitiator is an α - hydroxy ketone photoinitiator.

[0016] Preferably, the α - hydroxy ketone photoinitiator is 2 - hydroxy - 2 - methyl - 1 - phenylpropanone.

[0017] Preferably, the coupling agent is a silane coupling agent.

[0018] Preferably, the adhesion promoter is a phosphate - modified acrylate monomer.

[0019] Preferably, the automotive windshield micro - crack repair fluid is prepared from raw materials of the following components:

[0020] 30 - 35 parts by weight of No. 1 active diluent;

[0021] 5 - 8 parts by weight of No. 2 active diluent;

[0022] 10 - 20 parts by weight of No. 1 polyurethane acrylate;

[0023] 20 - 30 parts by weight of No. 2 polyurethane acrylate;

[0024] 4 - 5 parts by weight of photoinitiator;

[0025] 5 - 8 parts by weight of coupling agent;

[0026] 5 - 10 parts by weight of adhesion promoter.

[0027] The present invention also provides a preparation method of the automotive windshield micro - crack repair fluid according to the above - mentioned technical solution, comprising the following steps:

[0028] Mix the No. 1 active diluent, No. 2 active diluent, No. 1 polyurethane acrylate, No. 2 polyurethane acrylate, photoinitiator, coupling agent and adhesion promoter evenly to obtain the automotive windshield micro - crack repair fluid.

[0029] Preferably, the process of uniform mixing is specifically as follows:

[0030] Mix the No. 1 active diluent, No. 2 active diluent, No. 1 polyurethane acrylate, and No. 2 polyurethane acrylate, and conduct the first stirring to obtain a mixed solution; then sequentially add a photoinitiator, a coupling agent, and an adhesion promoter to the mixed solution, and conduct the second stirring to obtain a repair fluid for micro-cracks on an automotive windshield.

[0031] Preferably, the rotation speed of the first stirring is 500 r / min to 700 r / min, the temperature is 40°C to 60°C, and the time is 20 min to 40 min.

[0032] Preferably, the rotation speed of the second stirring is 500 r / min to 700 r / min, the temperature is 20°C to 30°C, and the time is 10 min to 20 min.

[0033] The present invention provides a repair fluid for micro-cracks on an automotive windshield, which is prepared from raw materials including the following components: 30 to 35 parts by weight of No. 1 active diluent; 5 to 10 parts by weight of No. 2 active diluent; 8 to 20 parts by weight of No. 1 polyurethane acrylate; 20 to 35 parts by weight of No. 2 polyurethane acrylate; 4 to 6 parts by weight of photoinitiator; 4 to 8 parts by weight of coupling agent; 5 to 15 parts by weight of adhesion promoter; the No. 1 active diluent is a trimethylolpropane formal acrylate monomer; the No. 2 active diluent is a trimethylolpropane triacrylate monomer; the No. 1 polyurethane acrylate is a bifunctional aliphatic polyurethane acrylate; the No. 2 polyurethane acrylate is a hexafunctional aliphatic polyurethane acrylate. Compared with the prior art, the repair fluid for micro-cracks on an automotive windshield provided by the present invention adopts specific components with specific contents to achieve good overall interaction. The cured coating film of the obtained repair fluid for micro-cracks on an automotive windshield has good hardness, toughness, and scratch resistance, and also has good yellowing resistance, good adhesion to the glass substrate; and after the whole coating film is cured, it has good light transmittance (visible light transmittance), water resistance, and alkali resistance, and has a perfect repair effect on the micro-cracks on the automotive windshield.

[0034] In addition, the preparation method provided by the present invention has a simple process and easy-to-control conditions, is suitable for large-scale production, and has broad application prospects. Brief Description of the Drawings <tmp

[0035] <tmp Figure 1 is a photo before repairing the crack on the automotive windshield;

[0036] Figure 2 is a photo after repairing with the repair fluid for micro-cracks on an automotive windshield provided in Example 3 of the present invention. Detailed Description of the Embodiments

[0037] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0038] The present invention provides a micro-crack repair fluid for automobile windshields, which is prepared from raw materials including the following components:

[0039] 30-35 parts by weight of active diluent No. 1;

[0040] 5-10 parts by weight of active diluent No. 2;

[0041] 8-20 parts by weight of polyurethane acrylate No. 1;

[0042] 20-35 parts by weight of polyurethane acrylate No. 2;

[0043] 4-6 parts by weight of photoinitiator;

[0044] 4-8 parts by weight of coupling agent;

[0045] 5-15 parts by weight of adhesion promoter;

[0046] The active diluent No. 1 is trimethylolpropane cycloformaldehyde acrylate monomer; the active diluent No. 2 is trimethylolpropane triacrylate monomer; the polyurethane acrylate No. 1 is a bifunctional aliphatic polyurethane acrylate; the polyurethane acrylate No. 2 is a hexafunctional aliphatic polyurethane acrylate.

[0047] In the present invention, the micro-crack repair fluid for automobile windshields is prepared from raw materials including active diluent No. 1, active diluent No. 2, polyurethane acrylate No. 1, polyurethane acrylate No. 2, photoinitiator, coupling agent and adhesion promoter, and is preferably prepared from raw materials including active diluent No. 1, active diluent No. 2, polyurethane acrylate No. 1, polyurethane acrylate No. 2, photoinitiator, coupling agent and adhesion promoter.

[0048] In the present invention, the active diluent No. 1 is trimethylolpropane cycloformaldehyde acrylate monomer; the active diluent No. 2 is trimethylolpropane triacrylate monomer; the polyurethane acrylate No. 1 is a bifunctional aliphatic polyurethane acrylate; the polyurethane acrylate No. 2 is a hexafunctional aliphatic polyurethane acrylate. The present invention has no special restrictions on the sources of the above raw materials, and commercially available products well-known to those skilled in the art can be used.

[0049] In the present invention, the photoinitiator is preferably an α-hydroxy ketone photoinitiator; the α-hydroxy ketone photoinitiator is preferably 2-hydroxy-2-methyl-1-phenylpropanone. The present invention has no special limitation on the source of the photoinitiator, and commercially available products well-known to those skilled in the art can be used.

[0050] In the present invention, the coupling agent is preferably a silane coupling agent. The present invention has no special limitation on the source of the coupling agent, and commercially available products well-known to those skilled in the art can be used.

[0051] In the present invention, the adhesion promoter is preferably a phosphate-modified acrylate monomer. The present invention has no special limitation on the source of the adhesion promoter, and commercially available products well-known to those skilled in the art can be used.

[0052] In the present invention, the micro-crack repair fluid for automotive windshields is preferably prepared from raw materials of the following components:

[0053] No. 1 active diluent: 30-35 parts by weight;

[0054] No. 2 active diluent: 5-8 parts by weight;

[0055] No. 1 polyurethane acrylate: 10-20 parts by weight;

[0056] No. 2 polyurethane acrylate: 20-30 parts by weight;

[0057] Photoinitiator: 4-5 parts by weight;

[0058] Coupling agent: 5-8 parts by weight;

[0059] Adhesion promoter: 5-10 parts by weight.

[0060] In the present invention, the photo-curing glass repair fluid uses some photosensitive resins with relatively low molecular weights as the main film-forming substances, including epoxy acrylate, polyurethane acrylate, polyester acrylate, etc. The photoinitiator in the formula, under the irradiation of ultraviolet light, undergoes a chemical change to generate substances (free radicals or cations) with the ability to initiate polymerization. The monomer free radicals and oligomers crosslink to form a coating film whose performance and appearance are close to those of glass. The active diluent in the formula can control and adjust the photo-curing rate, and the coupling agent can increase the adhesion to the glass surface; this product has good comprehensive performance and can meet the following technical requirements required by the present invention: (1) The cured coating film has good hardness, toughness and scratch resistance; (2) The cured coating film has good yellowing resistance; (3) The cured coating film has good adhesion to the glass substrate; (4) After the whole coating film is cured, it has good light transmittance (visible light transmittance); (5) The cured coating film has good water and alkali resistance.

[0061] The principle of realizing the product performance provided by the present invention is as follows: (1) Good hardness, toughness, scratch resistance and light transmittance of the coating film: The present invention uses difunctional polyurethane acrylate and hexa-functional polyurethane acrylate as the common film-forming substances. After curing, the coating film has good comprehensive properties, including hardness, toughness, scratch resistance and light transmittance (visible light transmittance); (2) Excellent yellowing resistance of the coating film: Both No. 1 and No. 2 polyurethane acrylates belong to aliphatic polyurethane acrylate polymers. The main chain is saturated alkane and cycloalkane, which are resistant to light, weather and not easy to yellow. At the same time, the selected photoinitiator is α-hydroxy ketone photoinitiator. There is no α-H at the ortho position of the benzoyl group in its molecular structure, and it has excellent thermal stability. There is no substituted benzyl structure that causes yellowing during photolysis, and it has good yellowing resistance; (3) Excellent adhesion to the glass surface: The coupling agent is siloxane methacrylate. The methacrylate group can participate in polymerization crosslinking and become part of the crosslinking network. At the same time, the siloxane group condenses with the silanol group on the glass surface to form a Si-O-Si structure, which greatly improves the adhesion of the coating on the glass surface.

[0062] The present invention also provides a preparation method of the automotive windshield micro-crack repair liquid according to the above technical solution, including the following steps:

[0063] Mix No. 1 active diluent, No. 2 active diluent, No. 1 polyurethane acrylate, No. 2 polyurethane acrylate, photoinitiator, coupling agent and adhesion promoter evenly to obtain the automotive windshield micro-crack repair liquid.

[0064] In the present invention, the No. 1 active diluent, No. 2 active diluent, No. 1 polyurethane acrylate, No. 2 polyurethane acrylate, photoinitiator, coupling agent and adhesion promoter are the same as those in the above technical solution, and will not be elaborated here.

[0065] In the present invention, the process of mixing evenly is preferably specifically as follows:

[0066] Mix No. 1 active diluent, No. 2 active diluent, No. 1 polyurethane acrylate and No. 2 polyurethane acrylate, and conduct the first stirring to obtain a mixed solution; then sequentially add the photoinitiator, coupling agent and adhesion promoter to the mixed solution, and conduct the second stirring to obtain the automotive windshield micro-crack repair liquid.

[0067] In the present invention, the rotation speed of the first stirring is preferably 500 r / min to 700 r / min, more preferably 600 r / min, the temperature is preferably 40 °C to 60 °C, more preferably 50 °C, and the time is preferably 20 min to 40 min, more preferably 30 min.

[0068] In the present invention, the rotation speed of the second stirring is preferably 500 r / min to 700 r / min, more preferably 600 r / min, the temperature is preferably 20 °C to 30 °C, more preferably 23 °C to 25 °C, and the time is preferably 10 min to 20 min, more preferably 15 min.

[0069] The preparation method provided by the present invention has a simple process and easy-to-control conditions, is suitable for large-scale production, and has broad application prospects.

[0070] The present invention provides a micro-crack repair fluid for automotive windshields, which is prepared from raw materials including the following components: 30 to 35 parts by weight of No. 1 active diluent; 5 to 10 parts by weight of No. 2 active diluent; 8 to 20 parts by weight of No. 1 polyurethane acrylate; 20 to 35 parts by weight of No. 2 polyurethane acrylate; 4 to 6 parts by weight of photoinitiator; 4 to 8 parts by weight of coupling agent; 5 to 15 parts by weight of adhesion promoter; the No. 1 active diluent is trimethylolpropane cycloformaldehyde acrylate monomer; the No. 2 active diluent is trimethylolpropane triacrylate monomer; the No. 1 polyurethane acrylate is a bifunctional aliphatic polyurethane acrylate; the No. 2 polyurethane acrylate is a hexafunctional aliphatic polyurethane acrylate. Compared with the prior art, the micro-crack repair fluid for automotive windshields provided by the present invention adopts specific components with specific contents to achieve good overall interaction. The cured coating film of the obtained micro-crack repair fluid for automotive windshields has good hardness, toughness and scratch resistance, and at the same time has good yellowing resistance, good adhesion to the glass substrate; and after the whole coating film is cured, it has good light transmittance (visible light transmittance) and water and alkali resistance, and has a perfect repair effect on the micro-cracks of automotive windshields.

[0071] In addition, the preparation method provided by the present invention has a simple process and easy-to-control conditions, is suitable for large-scale production, and has broad application prospects.

[0072] In order to further illustrate the present invention, the following detailed description is given through the following examples. The raw materials used in the following examples of the present invention are all commercially available; among them, the No. 1 active diluent is trimethylolpropane cycloformaldehyde acrylate monomer, the No. 2 active diluent is trimethylolpropane triacrylate monomer, the No. 1 polyurethane acrylate is a bifunctional aliphatic polyurethane acrylate, the No. 2 polyurethane acrylate is a hexafunctional aliphatic polyurethane acrylate, the photoinitiator is an α-hydroxy ketone photoinitiator (2-hydroxy-2-methyl-1-phenylpropanone), the coupling agent is a silane coupling agent - siloxane methacrylate, and the adhesion promoter is a phosphate-modified acrylate monomer.

[0073] Example 1

[0074] (1) Formulation (in parts by weight):

[0075] 32 parts of Reactive Diluent No. 1;

[0076] 8 parts of Reactive Diluent No. 2;

[0077] 20 parts of Polyurethane Acrylate No. 1;

[0078] 20 parts of Polyurethane Acrylate No. 2;

[0079] 5 parts of Photoinitiator;

[0080] 5 parts of Coupling Agent;

[0081] 10 parts of Adhesion Promoter;

[0082] (2) Preparation Method:

[0083] Mix all the raw materials evenly according to the above formula, specifically:

[0084] First, mix and stir Reactive Diluent No. 1, Reactive Diluent No. 2, Polyurethane Acrylate No. 1, and Polyurethane Acrylate No. 2 (rotation speed 600 rpm, temperature 50 °C, stirring time 30 minutes) to obtain a mixed solution; then, sequentially add the photoinitiator, coupling agent, and adhesion promoter to the mixed solution, and stir evenly (rotation speed 600 rpm, temperature 23 - 25 °C, stirring time 15 minutes) to obtain a photocurable repair solution, that is, the micro-crack repair solution for automotive windshields.

[0085] Example 2

[0086] (1) Formula (in parts by weight):

[0087] 32 parts of Reactive Diluent No. 1;

[0088] 8 parts of Reactive Diluent No. 2;

[0089] 15 parts of Polyurethane Acrylate No. 1;

[0090] 25 parts of Polyurethane Acrylate No. 2;

[0091] 5 parts of Photoinitiator;

[0092] 5 parts of Coupling Agent;

[0093] 10 parts of Adhesion Promoter;

[0094] (2) Preparation Method:

[0095] Same as Example 1, the micro-crack repair solution for automotive windshields.

[0096] Example 3

[0097] (1) Formula (in parts by weight):

[0098] 32 parts of Reactive Diluent No. 1;

[0099] 8 parts of Reactive Diluent No. 2;

[0100] 10 parts of Polyurethane Acrylate No. 1;

[0101] 30 parts of Polyurethane Acrylate No. 2;

[0102] 5 parts of Photoinitiator;

[0103] 5 parts of Coupling Agent;

[0104] 10 parts of Adhesion Promoter;

[0105] (2) Preparation Method:

[0106] Same as Example 1, the micro-crack repair fluid for automotive windshields.

[0107] Performance Test:

[0108] (1) The micro-crack repair fluids for automotive windshields obtained in Examples 1 to 3 were respectively tested for hardness, toughness, scratch resistance and light transmittance (visible light transmittance):

[0109] The pencil hardness of its coating film was determined according to the method for determining the hardness of coating films by pencils in GB / T 6739-1996; the flexibility of its coating film was determined according to the method for determining the flexibility of coating films in GB / T 1731-1993; the scratch resistance of its coating film was determined by applying a specified load on the scribe needle in accordance with 1.2a in the scratch test for paints and varnishes in GB / T 9279-2007; the light transmittance of the coating film was determined according to 4.3 visible light transmittance in GA / T 744-2013 for automotive window glass sunshade films. The test results are shown in Table 1.

[0110] Table 1 Performance data of the micro-crack repair fluids for automotive windshields obtained in Examples 1 to 3

[0111]

[0112] The test results show that: the micro-crack repair fluids for automotive windshields obtained in Examples 1 to 3 have good comprehensive performance. Especially for the micro-crack repair fluid for automotive windshields provided in Example 3, the coating film has good comprehensive performance, high hardness, moderate toughness, good scratch resistance and good light transmittance.

[0113] (2) Test for yellowing resistance of the coating film:

[0114] Comparative Example 1 is the same as Example 3, except that in Comparative Example 1, the α-hydroxyketone photoinitiator is not added, and the benzil photoinitiator is added.

[0115] Comparative Example 2 is the same as Example 3, except that in Comparative Example 1, no α-hydroxy ketone photoinitiator was added, and an acylphosphine oxide photoinitiator was added instead.

[0116] The film yellowing resistance of the automotive windshield microcrack repair fluids obtained in Example 3 and Comparative Examples 1-2 was tested respectively:

[0117] Its film yellowing resistance was determined according to the method for determining the yellowing resistance of wood coatings in GB / T 23983-2009, and the test results are shown in Table 2.

[0118] Table 2 Film yellowing resistance of the automotive windshield microcrack repair fluids obtained in Example 3 and Comparative Examples 1-2

[0119]

[0120] The test results show that: for the automotive windshield microcrack repair fluid obtained in Example 3, the cured film has excellent yellowing resistance.

[0121] (3) Adhesion test of the film on the glass substrate:

[0122] Comparative Example 3 is the same as Example 3, except that in Comparative Example 3, no silane coupling agent was added.

[0123] Comparative Example 4 is the same as Example 3, except that in Comparative Example 4, the addition amount of the silane coupling agent is 3 parts.

[0124] Comparative Example 5 is the same as Example 3, except that in Comparative Example 5, the addition amount of the silane coupling agent is 8 parts.

[0125] The adhesion of the films of the automotive windshield microcrack repair fluids obtained in Example 3 and Comparative Examples 3-5 on the glass substrate was tested respectively:

[0126] Its adhesion on the glass substrate was determined according to the cross-cut method for adhesion test of paints and varnishes in GB / T 9286-1998, and the test results are shown in Table 3.

[0127] Table 3 Adhesion of the films of the automotive windshield microcrack repair fluids obtained in Example 3 and Comparative Examples 1-2 on the glass substrate

[0128] Test item Adhesion grade Result description Example 3 Grade 0 The cutting edge is completely smooth and none falls off. Comparative example 3 Grade 2 The coating film has fallen off and the affected area is 10%. Comparative example 4 Grade 1 The coating film has fallen off and the affected area is 4%. Comparative example 5 Grade 0 The cutting edge is completely smooth and none falls off.

[0129] The test results show that: for the automotive windshield microcrack repair fluids obtained in Example 3 and Comparative Example 5, the films have the best adhesion to the glass substrate.

[0130] (4) Glass repair effect:

[0131] See Figures 1-2 as shown, Figure 1Photo before repairing the crack of the car windshield; Figure 2 Photo after being repaired with the micro-crack repair liquid for car windshields provided in Embodiment 3 of the present invention.

[0132] In summary, the present invention uses difunctional polyurethane acrylate and hexa-functional polyurethane acrylate as co-film formers, α-hydroxy ketone photoinitiator as the photoinitiator, and selects silane coupling agent. Under specific proportion conditions of each component, good overall interaction is achieved. The micro-crack repair liquid for car windshields obtained has good comprehensive properties: high hardness, moderate toughness, good scratch resistance, good yellowing resistance, good light transmittance, high adhesion to the glass substrate, good conformity, and can meet the usage requirements.

[0133] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A car windshield micro-crack repair liquid, characterized in that: Prepared from the following raw materials: 32 parts by weight of No. 1 reactive diluent; 8 parts by weight of No. 2 reactive diluent; 10 parts by weight of No. 1 polyurethane acrylate; 30 parts by weight of No. 2 polyurethane acrylate; 5 parts by weight of photoinitiator; 5 parts by weight of coupling agent; 10 parts by weight of adhesion promoter; The reactive diluent No. 1 is cyclotrimethylolpropane formal acrylate monomer; the reactive diluent No. 2 is trimethylolpropane triacrylate monomer; the polyurethane acrylate No. 1 is a difunctional aliphatic polyurethane acrylate; the polyurethane acrylate No. 2 is a hexafunctional aliphatic polyurethane acrylate; The adhesion promoter is a phosphate-modified acrylate monomer; The photoinitiator is 2-hydroxy-2-methyl-1-phenylpropanone.

2. The automobile windshield microcrack repair liquid according to claim 1, characterized in that: The coupling agent is a silane coupling agent.

3. A method for preparing the automobile windshield microcrack repair liquid according to any one of claims 1 to 2, characterized in that: The following steps are involved: No. 1 reactive diluent, No. 2 reactive diluent, No. 1 polyurethane acrylate, No. 2 polyurethane acrylate, a photoinitiator, a coupling agent and an adhesion promoter are uniformly mixed to obtain a car windshield microcrack repair liquid.

4. The preparation method according to claim 3, characterized in that The process of mixing uniformly is specifically as follows: Reactive diluent No. 1, reactive diluent No. 2, polyurethane acrylate No. 1, and polyurethane acrylate No. 2 are mixed and stirred for the first time to obtain a mixed solution; then a photoinitiator, a coupling agent, and an adhesion promoter are added to the mixed solution in sequence and stirred for a second time to obtain a car windshield microcrack repair liquid.

5. The preparation method according to claim 4, characterized in that The first stirring is performed at a rotation speed of 500 r / min to 700 r / min, a temperature of 40° C. to 60° C., and a time of 20 min to 40 min.

6. The preparation method according to claim 4, characterized in that The second stirring is performed at a rotation speed of 500 r / min to 700 r / min, a temperature of 20° C. to 30° C., and a time of 10 min to 20 min.

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