Primer for bonding automobile single-component polyurethane adhesive as well as preparation method and application of primer

Abstract

The invention discloses a primer for bonding an automobile single-component polyurethane adhesive as well as a preparation method and application of the primer, and belongs to the field of application of polyurethane adhesive primer, the primer for bonding the automobile single-component polyurethane adhesive comprises modified castor oil resin, a solvent, a catalyst, a curing agent, an isocyanate-containing silane coupling agent, powder, a dispersing agent and a dewatering agent. An organic silicon chain segment and a silane coupling agent containing vinyl are connected into a castor oil structure, and when the obtained primer is matched with polyurethane glue, the polyurethane glue has good adhesion to a steel sheet with a painted surface in a normal state and a high-temperature state; and the polyolefin material also has relatively good adhesion to black edges of windshields in a normal state and a high-temperature state.

Description

Technical Field

[0001] The present application belongs to the application field of polyurethane adhesive primer, and relates to a primer suitable for polyurethane glass adhesive bonding automobile plastic tailgate, and a preparation method and application thereof. Background Art

[0002] At present, when one-component polyurethane adhesive is used on automobiles, the adhesive that plays a bonding role is generally matched with a special primer. The primer is mostly used when the one-component polyurethane adhesive is used to bond the automobile windshield to the car body. The body of a traditional car is made of sheet metal, but with the rise of new energy vehicles, in order to meet the demand for lightweight cars, more and more plastic parts are beginning to be used on cars. A more prominent situation is that car tailgates begin to use plastic materials to form plastic tailgates. The materials generally used for plastic tailgates are PP+LGF40 (40% glass fiber reinforced polypropylene material) or PP+EPDNM-T30 (30% ethylene propylene rubber and talcum powder modified polypropylene material). When the car windshield is directly bonded to the plastic tailgate, and the car windshield is bonded to the plastic tailgate after flame or plasma treatment, the bonding strength and bonding area of ​​most single-component polyurethane adhesives are relatively poor, and the colloid is prone to falling off. In order to ensure bonding, it is necessary to use a primer. Currently, there are few primers on the market that can bond plastic tailgates, and there are also few primers that can meet the aging requirements such as high temperature resistance and moisture resistance.

[0003] There are many polyurethane sealant primers currently available, but they are basically aimed at traditional cars with sheet metal bodies. There is no clear solution for the bonding of plastic tailgates of new energy vehicles, and to ensure bonding stability, the plastic tailgate will be flame treated and then coated with a layer of primer. Some automobile factories will perform this process in advance to facilitate on-site assembly in the workshop and improve efficiency. After storage for several months, they will apply another layer of primer and then glue when the car is assembled. Since the primer relies on active substances to achieve bonding, the bonding is better with one application, but the effect may decrease with the second application, which places higher requirements on the primer.

[0004] Currently, there are many patents for relatively mature polyurethane adhesive primers, but most of them are only for traditional automobiles. For example, patent document CN102140304A shows that the primer has good adhesion to windshields and aluminum plates, but there is no clear solution to the problems of bonding plastic substrates and maintaining adhesion under high temperature and high humidity conditions in the existing public technology. Summary of the invention

[0005] In view of the defects of current primers, the present invention provides a primer matched with a single-component polyurethane glass glue, which can achieve the bonding of automobile plastic tailgates, automobile sheet metals and windshields, and solve the problem that the existing primer has poor high temperature resistance and moisture and heat resistance.

[0006] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0007] A primer for one-component polyurethane adhesive bonding of automobiles, comprising the following components in parts by weight:

[0008] 15-25 parts by mass of modified castor oil resin;

[0009] 15-25 parts by mass of solvent;

[0010] 0.1-0.2 parts by mass of catalyst;

[0011] 2-3 parts by mass of curing agent;

[0012] 1-2 parts by mass of a silane coupling agent containing isocyanate;

[0013] 1-2 parts by mass of powder;

[0014] 0.2-0.4 parts by mass of dispersant;

[0015] 0.1-0.2 parts by mass of water remover.

[0016] The modified castor oil resin is a resin obtained by connecting tetramethyldisiloxane and a vinyl-containing silane coupling agent to castor oil through hydrosilylation, and then reacting with polyisocyanate.

[0017] The solvent is one or more of ethyl acetate, butyl acetate and methyl ethyl ketone (also known as methyl ethyl ketone).

[0018] The catalyst is one or more of dibutyltin dilaurate, stannous octoate, triethylenediamine and bismorpholinyl diethyl ether.

[0019] The curing agent is one or more of polymethylene polyphenyl isocyanate (PAPI), triphenylmethane triisocyanate, and hexamethylene diisocyanate trimer (HDI trimer).

[0020] The isocyanate-containing silane coupling agent is one or more of 3-isocyanate propyl triethoxy silane and 3-isocyanate propyl trimethoxy silane.

[0021] The powder is carbon black.

[0022] The dispersant is BYK 2013 or BYK 163, preferably BYK 163.

[0023] The dewatering agent is p-toluenesulfonyl isocyanate.

[0024] On the other hand, the present invention also provides a modified castor oil resin and a preparation method thereof, and a preparation method of a primer for polyurethane sealant.

[0025] The raw materials of the modified castor oil resin include the following components in parts by weight:

[0026] Castor oil: 80-100 parts by mass;

[0027] Tetramethyldisiloxane: 30-50 parts by mass;

[0028] Vinyl-containing silane coupling agent: 50-90 parts by mass;

[0029] Polyisocyanate: 70-90 parts by mass;

[0030] Chloroplatinic acid catalyst: 0.001-0.002 parts by mass;

[0031] Solvent: 230-330 parts by mass;

[0032] The vinyl-containing silane coupling agent is one or more of vinyl trimethoxysilane, vinyl triethoxysilane, 3-methacryloxypropyl triethoxysilane, and 3-methacryloxypropyl trimethoxysilane, preferably 3-methacryloxypropyl trimethoxysilane;

[0033] The polyisocyanate is one or more of toluene diisocyanate, diphenylmethane diisocyanate (MDI), isophorone diisocyanate, hexamethylene diisocyanate, and liquefied MDI (carbodiimide modified), preferably liquefied MDI; in the present invention, unless otherwise specified, the term "liquefied MDI" refers to carbodiimide modified MDI.

[0034] The solvent is one of butyl acetate, ethyl acetate and methyl ethyl ketone, preferably butyl acetate.

[0035] A method for preparing a modified castor oil resin comprises the following steps:

[0036] Step 1: first, tetramethyldisiloxane, 10% of the total mass of the vinyl-containing silane coupling agent and chloroplatinic acid catalyst are added into a reaction kettle, reacted for at least 30 minutes, then slowly heated to 50-60° C. for reaction, and the remaining vinyl-containing silane coupling agent is added dropwise within 2 hours;

[0037] Step 2: After the dropwise addition is completed, the mixture of castor oil and solvent is continued to be added dropwise, and the temperature is slowly raised to 70-80° C. The dropwise addition time is at least 2 hours;

[0038] Step 3: After the dropwise addition is completed, the reaction is carried out for at least 1 hour, and polyisocyanate is directly added, and the reaction is carried out at 70-80° C. for at least 2 hours. After the reaction is completed, the material is discharged and sealed and stored to obtain modified castor oil resin.

[0039] A method for preparing a primer for polyurethane sealant comprises the following steps:

[0040] The raw materials of the primer for automobile one-component polyurethane adhesive bonding are added and mixed evenly, added into a ball mill or a sand mill, and ground for at least 3 hours under the protection of high-purity nitrogen to obtain the primer.

[0041] Castor oil is the oil extracted from castor beans. Castor oil molecules are natural fatty acid triglycerides and contain double bonds (castor oil is abbreviated as R 1 -C=CR 2 ), tetramethyldisiloxane is connected by hydrosilylation, and then silane containing vinyl is connected by hydrosilylation. The reaction principle is as follows Figure 1 At the same time, castor oil contains hydroxyl groups, which can react with polyisocyanates.

[0042] Compared with the current technology, the present invention has at least the following advantages:

[0043] (1) The present invention designs the molecular structure based on the bonding mechanism, giving full play to the structural characteristics of castor oil, inserting organic silicon segments and vinyl-containing silane coupling agents into the castor oil structure, and the primer and polyurethane adhesive are combined to improve the bonding performance, moisture and heat resistance, and high temperature resistance of the polyurethane adhesive on the painted steel sheet substrate.

[0044] (2) When organic silicon segments and vinyl-containing silane coupling agents are introduced into the castor oil structure, 3-methacryloxypropyltrimethoxysilane is used as the vinyl-containing silane coupling agent to be introduced into the castor oil structure. When the obtained primer is combined with polyurethane adhesive, the polyurethane adhesive not only has good adhesion to painted steel sheets under normal and high temperature conditions, but also has good adhesion to the black edge of windshields and polyolefin materials under normal and high temperature conditions, thereby expanding the application range of the polyurethane adhesive.

[0045] (3) The experiment found that the primer prepared by using liquefied MDI containing carbodiimide (-N=C=N-) can further improve the moisture and heat resistance of polyurethane adhesive. The prepared primer not only has good adhesion to painted steel sheets, windshield black edges, polypropylene (PP) and other polyolefin materials under normal and high temperature conditions, but also has good adhesion to three types of substrates under wet and hot conditions, so that the single-component polyurethane adhesive colloid, primer and substrate form a solid whole, which greatly expands the application range of sealants.

[0046] (4) The present invention is simple and convenient to use, and the primer surface dries quickly. Glue can be applied a few minutes after application. In addition, the present invention can meet the requirements of many automobile manufacturers. The plastic tailgate can be flame-treated in advance and then coated with a layer of primer. The plastic tailgate can be left for several months to half a year. When the automobile is assembled, another layer of primer can be applied to still meet the bonding requirements. This can reduce on-site processes and improve efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is the reaction principle of the preparation method of modified castor oil resin. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0049] Example 1

[0050] (1) Modified castor oil resin component and preparation

[0051] Table 1 Components and dosage

[0052] raw material Amount (parts by mass) castor oil 93 Tetramethyldisiloxane 40 Vinyltrimethoxysilane 50 Butyl acetate 260 Liquefied MDI 80 Chloroplatinic acid catalyst 0.001

[0053] First, 40 parts by mass of tetramethyldisiloxane, 5 parts by mass of vinyltrimethoxysilane and 0.001 parts by mass of chloroplatinic acid catalyst were added into the reactor for reaction for 30 minutes, then the temperature was slowly raised to 60°C for reaction, and the remaining 45 parts by mass of vinyltrimethoxysilane was added dropwise within 2 hours. After the addition was completed, a mixture of 93 parts by mass of castor oil and 260 parts by mass of butyl acetate was continued to be added dropwise, and the temperature was slowly raised to 70°C for 2 hours. After the addition was completed, the reaction was continued for 1 hour, and then 80 parts by mass of liquefied MDI was directly added, the temperature was raised to 80°C for reaction for 2 hours, and the discharge was sealed and stored after the reaction was completed.

[0054] (2) Preparation of primer

[0055] Add 20 parts by mass of modified castor oil resin, 25 parts by mass of solvent butyl acetate, 0.02 parts by mass of dibutyltin dilaurate, 0.1 parts by mass of bismorpholinyl diethyl ether, 3 parts by mass of PAPI, 1 part by mass of 3-isocyanatopropyltriethoxysilane, 1 part by mass of carbon black, 0.2 parts by mass of BYK-163, and 0.1 parts by mass of p-toluenesulfonyl isocyanate in sequence, mix well, pour into a ball mill, fill with high-purity nitrogen for protection, grind for 3 hours, and seal the discharged material for storage.

[0056] Example 2

[0057] (1) Modified castor oil resin component and preparation

[0058] Table 2 Components and dosage

[0059] raw material Amount (parts by mass) castor oil 80 Tetramethyldisiloxane 30 Vinyltriethoxysilane 60 Butyl acetate 230 Liquefied MDI 70 Chloroplatinic acid catalyst 0.0015

[0060] First, 30 parts by mass of tetramethyldisiloxane, 6 parts by mass of vinyltriethoxysilane and 0.0015 parts by mass of chloroplatinic acid catalyst were added into the reactor for reaction for 30 minutes, and then the temperature was slowly raised to 50°C for reaction. The remaining 54 parts by mass of vinyltriethoxysilane were added dropwise within 2 hours. After the addition was completed, a mixture of 80 parts by mass of castor oil and 230 parts by mass of butyl acetate was continued to be added dropwise, and the temperature was slowly raised to 70°C for 2 hours. After the addition was completed, 70 parts by mass of liquefied MDI was directly added, the temperature was raised to 80°C for reaction for 2 hours, and the discharge was sealed and stored after the reaction was completed.

[0061] (2) Preparation of primer

[0062] Add 20 parts by mass of modified castor oil resin, 20 parts by mass of solvent butyl acetate, 0.02 parts by mass of dibutyltin dilaurate, 0.08 parts by mass of bismorpholinyl diethyl ether, 2.5 parts by mass of PAPI, 1.5 parts by mass of 3-isocyanatopropyltrimethoxysilane, 1.5 parts by mass of carbon black, 0.3 parts by mass of BYK-163, and 0.1 parts by mass of p-toluenesulfonyl isocyanate in sequence, mix well, pour into a ball mill, fill with high-purity nitrogen for protection, grind for 3 hours, and seal the discharged material for storage.

[0063] Example 3

[0064] (1) Modified castor oil resin component and preparation

[0065] Table 3 Components and dosage

[0066]

[0067]

[0068] First, 40 parts by mass of tetramethyldisiloxane, 7.5 parts by mass of 3-methacryloxypropyltrimethoxysilane and 0.0015 parts by mass of chloroplatinic acid catalyst were added into the reactor for reaction for 30 minutes, and then the temperature was slowly raised to 60°C for reaction. The remaining 67.5 parts by mass of 3-methacryloxypropyltrimethoxysilane was added dropwise within 2 hours. After the addition was completed, a mixture of 93 parts by mass of castor oil and 280 parts by mass of butyl acetate was continued to be added dropwise, and the temperature was slowly raised to 70°C. The addition time was 2 hours. After the addition was completed, 80 parts by mass of liquefied MDI was directly added, the temperature was raised to 80°C for reaction for 2 hours, and the discharge was sealed and stored after the reaction was completed.

[0069] (2) Preparation of primer

[0070] Add 15 parts by mass of modified castor oil resin, 20 parts by mass of solvent butyl acetate, 0.1 parts by mass of dibutyltin dilaurate, 0.05 parts by mass of bismorpholinyl diethyl ether, 2 parts by mass of PAPI, 1.5 parts by mass of 3-isocyanatopropyltrimethoxysilane, 1.5 parts by mass of carbon black, 0.3 parts by mass of BYK-163, and 0.15 parts by mass of p-toluenesulfonyl isocyanate in sequence, mix well, pour into a ball mill, fill with high-purity nitrogen for protection, grind for 3 hours, and seal the discharged material for storage.

[0071] Example 4

[0072] (1) Modified castor oil resin component and preparation

[0073] Table 4 Components and dosage

[0074]

[0075]

[0076] First, 50 parts by mass of tetramethyldisiloxane, 9 parts by mass of 3-methacryloxypropyltrimethoxysilane and 0.002 parts by mass of chloroplatinic acid catalyst were added to the reactor for reaction for 30 minutes, and then the temperature was slowly raised to 60°C for reaction. The remaining 81 parts by mass of 3-methacryloxypropyltrimethoxysilane was added dropwise within 2 hours. After the addition was completed, a mixture of 100 parts by mass of castor oil and 330 parts by mass of butyl acetate was continued to be added dropwise, and the temperature was slowly raised to 70°C for 2 hours. After the addition was completed, 90 parts by mass of diphenylmethane diisocyanate was directly added, the temperature was raised to 80°C for reaction for 2 hours, and the reaction was completed and the material was sealed and stored.

[0077] (2) Preparation of primer

[0078] Add 25 parts by mass of modified castor oil resin, 25 parts by mass of solvent butyl acetate, 0.1 parts by mass of dibutyltin dilaurate, 0.1 parts by mass of bismorpholinyl diethyl ether, 3 parts by mass of PAPI, 2 parts by mass of 3-isocyanatopropyltrimethoxysilane, 2 parts by mass of carbon black, 0.4 parts by mass of BYK-2013, and 0.2 parts by mass of p-toluenesulfonyl isocyanate in sequence, mix well, pour into a ball mill, fill with high-purity nitrogen for protection, grind for 3 hours, and seal the discharged material for storage.

[0079] Comparative Example 1

[0080] (1) Castor oil resin components and preparation

[0081] Table 5 Components and dosage

[0082]

[0083]

[0084] First, add 75 parts by mass of 3-methacryloxypropyltrimethoxysilane and 0.0015 parts by mass of chloroplatinic acid catalyst into the reactor, stir for 30 minutes, then slowly heat up to 60°C for reaction, dropwise add 93 parts by mass of castor oil and 280 parts by mass of butyl acetate within 2 hours, slowly heat up to 70°C, and add for 2 hours. After the addition, directly add 80 parts by mass of liquefied MDI, heat up to 80°C for reaction for 2 hours, and seal and store the discharged material after the reaction.

[0085] (2) Preparation of primer

[0086] The preparation method is the same as Example 3 except that the castor oil resin prepared in this comparative example is used.

[0087] Comparative Example 2

[0088] (1) Castor oil resin components and preparation

[0089] Table 6 Components and dosage

[0090] raw material Dosage (parts by mass) castor oil 93 Tetramethyldisiloxane 40 Butyl acetate 280 Liquefied MDI 80 Chloroplatinic acid catalyst 0.0015

[0091] First, 40 parts by weight of tetramethyldisiloxane, 10 parts by weight of castor oil and 0.0015 parts by weight of chloroplatinic acid catalyst were added into a reactor and reacted for 30 minutes, then the temperature was slowly raised to 60°C for reaction. A mixture of 83 parts by weight of castor oil and 280 parts by weight of butyl acetate was added dropwise within 2 hours, and the temperature was slowly raised to 70°C. The dropping time was 2 hours. After the dropping was completed, 80 parts by weight of liquefied MDI was directly added, the temperature was raised to 80°C for reaction for 2 hours, and the reaction was completed. The discharged material was sealed and stored.

[0092] (2) Preparation of primer

[0093] Except for using the castor oil resin prepared in this comparative example, other preparation methods are the same as those in Example 3.

[0094] Performance Test:

[0095] 1. Surface drying time: Tested according to GB / T 13477.5-2002 Test methods for building sealing materials.

[0096] 2. Peel adhesion: The test was conducted according to QC / T 1024-2015 single-component polyurethane sealant for automobiles, and the peel test was conducted after aging at 120℃ for 3h and 70℃ and 95% humidity for 300h.

[0097] 3. Shear strength and aging resistance: tested according to QC / T 1024-2015 one-component polyurethane sealant for automobiles.

[0098] The substrates selected were the black edge of the windshield, painted steel sheets, and PP+LGF40 plastic sheets for testing. The PP+LGF40 plastic sheets needed to be flame or plasma treated first, and then coated with a layer of primer. After being placed for half a month, a layer of primer was directly applied, and then a single-component polyurethane adhesive was applied. After being cured for 7 days under standard conditions (temperature 23±2°C, humidity 50±5%), the normal adhesion was tested to simulate the use of primers on plastic tailgates during actual applications. The black edge of the windshield and the painted steel sheets were directly coated with primer and then glued. They were cured for 7 days under standard conditions (temperature 23±2°C, humidity 50±5%) to test the normal adhesion. After the samples were cured, they were placed at 120°C for 3h, and after being placed under standard conditions for 1 day, the adhesion after heat aging was tested. After the samples were cured, they were placed at 70°C and 95% for 300h, and after being placed under standard conditions for 1 day, the adhesion after wet heat aging was tested.

[0099] Table 7 Peel test results of Examples 1-4 and Comparative Examples 1-2

[0100]

[0101]

[0102] Note: CF is cohesive failure, AF is interfacial failure. “ / ” means no content, “——” means no data, blank means direct gluing without primer.

[0103] It can be seen from the above table that modified castor oil is used in the primers prepared in Examples 1-4, and the modified castor oil is grafted with tetramethyldisiloxane and a vinyl-containing silane coupling agent. When used with the primer, the polyurethane adhesive has good adhesion to windshields, painted steel plates, and PP+LGF40 plastic sheets.

[0104] Compared with Example 3, the castor oil in Comparative Example 1 was not grafted with tetramethyldisiloxane, and the castor oil in Comparative Example 2 was not grafted with a vinyl-containing silane coupling agent. When the prepared primer was used in combination with the polyurethane adhesive, the polyurethane adhesive had poor bonding effects on windshields, painted steel plates, and PP+LGF40 plastic sheets.

[0105] From the comparison between Example 3 and other examples, it can be seen that the adhesion of 3-methacryloxypropyltrimethoxysilane and liquefied MDI grafted castor oil is the best and can pass the conventional high temperature resistance, water resistance, and wet heat resistance performance tests.

[0106] Although the present invention is described herein with reference to the illustrative embodiments of the present invention, it should be understood that those skilled in the art can design many other modifications and implementations, which will fall within the scope and spirit of the principles disclosed in the present application. More specifically, within the scope disclosed in the present application, multiple variations and improvements can be made to the components and / or layout of the subject combination layout. In addition to the variations and improvements made to the components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. A primer for automotive one-component polyurethane adhesive bonding, characterized in that: Includes the following components: 15-25 parts by mass of modified castor oil resin; 15-25 parts by mass of solvent; 0.1-0.2 parts by mass of catalyst; 2-3 parts by mass of curing agent; 1-2 parts by mass of a silane coupling agent containing isocyanate; 1-2 parts by mass of powder; 0.2-0.4 parts by mass of dispersant; 0.1-0.2 parts by mass of water remover.

2. The one-component polyurethane adhesive primer for automobiles according to claim 1, characterized in that: The modified castor oil resin is a resin obtained by connecting tetramethyldisiloxane and a vinyl-containing silane coupling agent to castor oil through hydrosilylation, and then reacting with polyisocyanate.

3. The one-component polyurethane adhesive primer for automobiles according to claim 1 or 2, characterized in that: The modified castor oil resin is made from raw materials including the following components: Castor oil: 80-100 parts by mass; Tetramethyldisiloxane: 30-50 parts by mass; Vinyl-containing silane coupling agent: 50-90 parts by mass; Polyisocyanate: 70-90 parts by mass; Chloroplatinic acid catalyst: 0.001-0.002 parts by mass; Solvent: 230-330 parts by mass.

4. The one-component polyurethane adhesive primer for automobiles according to claim 3, characterized in that: The vinyl-containing silane coupling agent is one or more of vinyl trimethoxy silane, vinyl triethoxy silane, 3-methacryloxypropyl triethoxy silane, and 3-methacryloxypropyl trimethoxy silane.

5. The one-component polyurethane adhesive primer for automobiles according to claim 3 or 4, characterized in that: The polyisocyanate is one or more of toluene diisocyanate, diphenylmethane diisocyanate, isophorone diisocyanate, hexamethylene diisocyanate, and carbodiimide-modified liquefied MDI.

6. The one-component polyurethane adhesive primer for automobiles according to claim 5, characterized in that: The preparation method of the modified castor oil resin is as follows: Step 1: first, tetramethyldisiloxane, 10% of the total mass of the vinyl-containing silane coupling agent and chloroplatinic acid catalyst are added into a reaction kettle, reacted for at least 30 minutes, then slowly heated to 50-60° C. for reaction, and the remaining vinyl-containing silane coupling agent is added dropwise within 2 hours; Step 2: After the dropwise addition is completed, the mixture of castor oil and solvent is continued to be added dropwise, and the temperature is slowly raised to 70-80° C. The dropwise addition time is at least 2 hours; Step 3: After the dropwise addition is completed, the reaction is carried out for at least 1 hour, and polyisocyanate is directly added, and the reaction is carried out at 70-80° C. for at least 2 hours. After the reaction is completed, the material is discharged and sealed and stored to obtain modified castor oil resin.

7. The one-component polyurethane adhesive primer for automobiles according to claim 2 or 6, characterized in that: The catalyst is one or more of dibutyltin dilaurate, stannous octoate, triethylenediamine, and bismorpholinyl diethyl ether; The curing agent is one or more of polymethylene polyphenyl isocyanate (PAPI), triphenylmethane triisocyanate, and hexamethylene diisocyanate trimer (HDI trimer); The isocyanate-containing silane coupling agent is one or more of 3-isocyanatepropyltriethoxysilane and 3-isocyanatepropyltrimethoxysilane; The powder is carbon black; The dispersant is BYK 2013 or BYK 163; The dewatering agent is p-toluenesulfonyl isocyanate.

8. The one-component polyurethane adhesive primer for automobiles according to claim 2 or 6, characterized in that: The solvent is one of butyl acetate, ethyl acetate and methyl ethyl ketone, preferably butyl acetate.

9. A method for preparing a primer for automotive one-component polyurethane adhesive bonding, characterized in that: Prepare the raw materials of the primer for automobile one-component polyurethane adhesive bonding according to any one of claims 1 to 8, mix them evenly, add them into a ball mill or a sand mill, use high-purity nitrogen protection, and grind for at least 3 hours to obtain the primer.

10. Application of a primer for automotive one-component polyurethane adhesive bonding, characterized in that: As a primer for painted steel sheets, black edges of windshields or polyolefin materials, used in conjunction with one-component polyurethane adhesive.

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