Two-component automotive interior spray adhesive and preparation method and application thereof

Abstract

The invention discloses a two-component automotive interior spray adhesive and a preparation method and application thereof, and relates to the technical field of adhesives. The invention provides a two-component automotive interior spray adhesive, comprising component A and component B; the component A comprises the following components in parts by weight: 50-70 parts of aqueous polyurethane emulsion, 10-30 parts of aqueous chlorinated polypropylene emulsion, 10-30 parts of aqueous polyolefin dispersion, 2-5 parts of adhesion promoter, 1.5-5 parts of nano-silicon dioxide, 0.1-0.3 parts of thickener, 0.01-0.1 parts of multifunctional additive, 0.2-0.5 parts of wetting agent, 0.05-0.2 parts of defoamer, 0.05-0.2 parts of preservative, 0.2-0.5 parts of anti-hydrolysis crosslinking agent, and the component B comprises the following components in parts by weight: 2-5 parts of isocyanate crosslinking agent. When the two-component automotive interior spray adhesive provided by the invention is used, component A is mixed with component B, which greatly improves the bonding strength and heat resistance of the spray adhesive.

Description

Technical Field

[0001] The invention relates to the technical field of adhesives, in particular to a two-component automotive interior spray adhesive and a preparation method and application thereof. Background Art

[0002] Waterborne polyurethane adhesive uses water instead of organic solvent as the dispersion medium, also known as water-dispersed polyurethane, water-based polyurethane or water-based polyurethane. It not only has excellent performance close to that of solvent-based polyurethane adhesive, but also has the advantages of no pollution, safety and reliability, excellent mechanical properties, good compatibility, easy modification, etc. At the same time, waterborne polyurethane adhesive has very good flexibility, and its performance even exceeds that of acrylic emulsion adhesive. In addition, the epoxy-modified polyurethane cationic emulsion system makes it water-resistant, solvent-resistant, with excellent feel and strong adhesion. It is a new type of adhesive that has emerged against the backdrop of the increasing environmental awareness in the world.

[0003] At present, chloroprene glue, acrylic glue, and hot melt glue are mostly used for bonding low surface energy substrates such as PP, which have problems such as strong odor, serious pollution, troublesome substrate surface treatment, and high cost. Water-based polyurethane automotive interior adhesive can be used in the interior decoration of components such as car ceilings, carpets, floor mats, dashboards, and door inner panels. These parts are usually composited by multiple layers of non-metallic materials during the manufacturing process, and different materials are effectively bonded by water-based polyurethane adhesives. At present, water-based polyurethanes replace organic solvents as a dispersion medium. The surface energy of water is greater than that of ordinary solvents, and the wetting ability of low-energy surfaces is poor. For some modified low-surface energy materials, the adhesion is not good, such as hemp fiberboard, PC / ABS modified materials, and PP non-polar materials. Moreover, most of the current water-based polyurethanes are linear thermoplastics, and the molecular chains contain hydrophilic groups, resulting in insufficient moisture and heat resistance.

[0004] Therefore, an automotive interior spray adhesive with good adhesion and resistance to moisture and heat has broad application prospects. Summary of the invention

[0005] Based on this, the purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a two-component automotive interior spray adhesive with good adhesion and moisture and heat resistance, as well as a preparation method and application thereof.

[0006] To achieve the above-mentioned purpose, the technical scheme adopted by the present invention is: a two-component automotive interior spray adhesive, comprising component A and component B; the component A comprises the following components in parts by weight: 50-70 parts of aqueous polyurethane emulsion, 10-30 parts of aqueous chlorinated polypropylene emulsion, 10-30 parts of aqueous polyolefin dispersion, 2-5 parts of adhesion promoter, 1.5-5 parts of nano silicon dioxide, 0.1-0.3 parts of thickener, 0.01-0.1 parts of multifunctional additive, 0.2-0.5 parts of wetting agent, 0.05-0.2 parts of defoaming agent, 0.05-0.2 parts of preservative, and 0.2-0.5 parts of anti-hydrolysis crosslinking agent; the component B comprises the following components in parts by weight: 2-5 parts of isocyanate crosslinking agent.

[0007] The present invention introduces a water-based polyolefin dispersion liquid and a water-based chlorinated polypropylene emulsion containing fluorine or silicon monomers into the water-based polyurethane spray adhesive. Compared with other low surface energy emulsions, the water-based polyolefin dispersion liquid and the water-based chlorinated polypropylene themselves have olefin structures, which are closer to the structure of PP, which is also an olefin, and can significantly reduce the surface energy of the colloid. The adhesion promoter dedicated to the PP substrate is used to synergistically improve the adhesion to the PP, making the strength higher. The fast-crystallizing polyurethane emulsion gives the glue main body bonding performance and accelerates the bonding speed.

[0008] The invention introduces nano silicon dioxide into the main emulsion to reduce the surface energy and polarity of the aqueous polyurethane emulsion and improve the mechanical properties of the colloid; adds a suitable wetting agent into the spray adhesive component to further reduce the surface energy of the aqueous emulsion, thereby enhancing the wettability of the aqueous emulsion; and adds an anti-hydrolysis cross-linking agent and an isocyanate cross-linking agent to ensure the final bonding strength and moisture and heat resistance of the emulsion, thereby achieving the purpose of bonding low surface energy materials, making the emulsion suitable for coating low surface energy material accessories for automobile interior decoration, and taking both economy and environmental protection into consideration.

[0009] The present invention takes into account both bonding strength and high temperature resistance, and optimizes and adjusts the composition and weight of each raw material of the two-component automotive interior spray adhesive. The main body of the base material is an aqueous polyurethane emulsion, and at the same time, an aqueous chlorinated polypropylene emulsion and an aqueous polyolefin dispersion are introduced, which are emulsions that are similar to PP in structure and can simultaneously reduce the surface energy of the system. Among them, the total proportion of the chlorinated polypropylene emulsion and the aqueous polyolefin dispersion does not exceed the main body content of the base material. The present invention not only improves the bonding strength to low surface energy substrates and improves the adhesion of the spray adhesive to PP and interior fabrics through specific weight adjustment, but also improves the final bonding strength and moisture and heat resistance, so that the spray adhesive of the present invention has a wider application range and better performance.

[0010] When the two-component automotive interior spray adhesive provided by the present invention is used, component A and component B are mixed, and the hexamethylene diisocyanate in component B and the carbodiimide in component A synergistically cross-link to form a cross-linked network, thereby reducing the swelling rate and further improving the bonding strength, weather resistance and non-yellowing properties of the colloid. After spraying, component B can react with water vapor in the air and active groups (such as hydroxyl groups, carboxyl groups, etc.) contained in component A, thereby greatly improving the bonding strength and heat resistance of the spray adhesive.

[0011] Preferably, in the component A, the mass percentage of the aqueous polyurethane emulsion is 55-65%.

[0012] Preferably, the weight ratio of the aqueous chlorinated polypropylene emulsion to the aqueous polyolefin dispersion is 1:1.

[0013] The inventors found in the actual experimental process that the mass percentage of the aqueous polyurethane emulsion and the weight ratio of the aqueous chlorinated polypropylene emulsion and the aqueous polyolefin dispersion in component A will affect the performance of the two-component automotive interior spray adhesive finally prepared. When the mass percentage of the aqueous polyurethane emulsion in component A is 55-65%, and / or the total mass percentage of the aqueous chlorinated polypropylene emulsion and the aqueous polyolefin dispersion is 35-45%, and / or the weight ratio of the aqueous chlorinated polypropylene emulsion and the aqueous polyolefin dispersion is 1:1, the prepared two-component automotive interior spray adhesive has better adhesion and better moisture and heat resistance.

[0014] Preferably, the two-component automotive interior spray adhesive comprises at least one of the following (a)-(k):

[0015] (a) the aqueous polyurethane emulsion is at least one of Covestro U53, U54, U56, and U58;

[0016] (b) the aqueous chlorinated polypropylene emulsion is at least one of SUPERCHLON E-415, SUPERCHLON E-480T, and SUPERCHLON E-503;

[0017] (c) the aqueous polyolefin dispersion is at least one of AE-202, AE-301, AE-502, and AE-6097;

[0018] (d) the adhesion promoter is at least one of EH801, CP347W, and CP349W;

[0019] (e) the nano silicon dioxide is at least one of Ecosol A200 and HIFULL HL200;

[0020] (f) the thickener is at least one of an associative polyurethane thickener and an alkali-swellable emulsion thickener;

[0021] (g) the multifunctional additive is Dow AMP95;

[0022] (h) the wetting agent is at least one of an acetylenediol ethoxy wetting agent and a polysiloxane wetting agent;

[0023] (i) the defoamer is at least one of a silicone defoamer and a polyether defoamer;

[0024] (g) the preservative is LANXESS D7LT fungicide;

[0025] (k) The anti-hydrolysis cross-linking agent is a carbodiimide anti-hydrolysis cross-linking agent.

[0026] Preferably, the isocyanate cross-linking agent is hexamethylene diisocyanate; further preferably, the hexamethylene diisocyanate is at least one of Desmodur DN, 3100, 304, and 305 produced by Covestro.

[0027] Preferably, the aqueous chlorinated polypropylene emulsion has a chlorine content higher than 10%.

[0028] Further preferably, the aqueous polyurethane emulsion is Covestro U56, which is a high molecular weight aqueous anionic polyurethane dispersion with a solid content of 50%, which further improves the thermal stability, plasticizer resistance, grease resistance and oil resistance of the bonding, and provides the main bonding strength of the spray glue body.

[0029] Further preferably, the aqueous chlorinated polypropylene emulsion is SUPERCHLON E-503, which has a chlorine content of 20%, a solid content of 40%, and a softening temperature within the range of 50-60°C. E-503 is a fluorine-containing polymer emulsion, and its CF bond structure makes its surface energy extremely low, exhibiting excellent hydrophobicity, weather resistance and thermal stability, and can significantly improve the adhesion to substrates such as polypropylene PP, reduce the adhesion to low surface energy materials, and greatly enhance the wide application of spray adhesive to substrates.

[0030] Further preferably, the aqueous polyolefin dispersion is AE-6097. Compared with other aqueous polyolefins, AE-6097 is a silane-modified acrylic emulsion that introduces active silicone monomers, giving the colloid the characteristic of low surface energy. At the same time, it reduces the proportion of emulsifier, inhibits the softening of the emulsifier during film formation, and its water resistance is also improved, and it has high adhesion to polyolefin substrates.

[0031] Further preferably, the adhesion promoter is EH801, which is easily compatible with polyurethane dispersions and can be directly added to aqueous systems. It is more suitable for aqueous polyurethane and aqueous acrylic emulsions. It is a water-based adhesion promoter specifically for low surface energy materials such as PP. Because it contains amino groups, carboxyl groups, etc., it produces hydrogen bonds or chemical bonds with oxygen atoms or hydroxyl groups on the surface of the substrate to improve adhesion. In addition, by improving the mechanical bonding force, countless small anchor-like structures are formed on the surface of the substrate to firmly grasp the substrate, thereby improving the adhesion and bonding to the low surface energy substrate. After addition, the adhesion is significantly improved, and it has the characteristics of high efficiency and environmental protection.

[0032] Further preferably, the nano-silica is Ecosol A200, which is a hydrophilic fumed nano-silica with a particle size of 12 nm, good dispersibility, low agglomeration probability, and can accelerate the adhesion of the spray glue. Through chemical bonding, the nano-silica and the polyurethane form a network cross-linked structure, which reduces the surface energy of the water-based polyurethane emulsion. The mass fraction of nano-silica reaches 1.5%, the fracture strength of the colloid bonding reaches the maximum value, and it can be evenly dispersed at the nanoscale, significantly enhancing its mechanical properties, and improving the heat resistance and moisture resistance of the water-based polyurethane through chemical bonding and hydrogen bonding.

[0033] Further preferably, the thickener is Gel 0625, Gel 0620; More preferably, the thickener is Gel 0625, A mixture of Gel 0620 with a weight ratio of 7:3.

[0034] Further preferably, the multifunctional auxiliary agent is Dow AMP95, which has excellent functions such as dispersion, thickening, pH adjustment, non-discoloration, and antimicrobial (bactericidal) properties, which can enable the spray glue to obtain better storage stability and dispersibility.

[0035] Further preferably, the wetting agent is Evonik SURFYNOL 440, which is an acetylenic diol wetting agent and a non-ionic surfactant with a twin star structure, which has good dispersibility and stability, and its HLB value is 8. It can stably exist in an aqueous system and has high hydrophilicity. Compared with other wetting agents, it forms hydrogen bonds with the water-based system to reduce the surface tension of the system, especially the static surface tension, and has good compatibility with water-based polyurethane emulsions without stratification and precipitation. It is suitable for adhesives whose main base material is water-based polyurethane. Adding more than 0.1% of it can reduce the static surface tension of the glue to below 32mN / m without affecting the bonding effect of the glue layer, and can effectively reduce the spray glue to ensure good wettability of the substrate, thereby enhancing the adhesion of the spray glue to the substrate and the interior fabric.

[0036] Further preferably, the defoaming agent is at least one of TEGO Airex 902W and Z-530; more preferably, the defoaming agent is TEGO Airex 902W, which is an environmentally friendly silicone defoaming agent. While having high-efficiency defoaming and anti-foaming properties, it can also synergistically reduce the surface tension of the aqueous system and improve the surface activity. It also has better thermal stability, can be used in a wider temperature range, is suitable for designing the use environment of spraying, has no physiological toxicity, and is environmentally friendly.

[0037] Further preferably, the anti-hydrolysis crosslinking agent is BASF baltanex W02, with an NCN content of ≥6%, an N=C=N double bond structure, and can react with compounds containing active hydrogen. It is the best hydrolysis inhibitor for polyester compounds. The aldehyde group and the phenol group between the carbodiimide molecules can undergo a condensation reaction to form a crosslinked structure, which is formed by a hardening reaction between two adjacent polycarbodiimide molecules. By sharing oxygen atoms and carbon atoms, a three-dimensional crosslinked network is formed, which can undergo a crosslinking reaction with the carboxyl group in the polyurethane, which is more in line with the characteristics of water-based polyurethane glue, can reduce the initial acid value of polyester polyols, inhibit polyester hydrolysis, and effectively improve the hydrolysis resistance of polyurethane. It can make the spray glue have excellent mechanical properties, thermal stability and chemical corrosion resistance, and at the same time, it has a long adaptation period, which is conducive to the long-term storage of water-based polyurethane.

[0038] Further preferably, the isocyanate crosslinker is Covestro Desmodur DN, which is an aliphatic polyisocyanate curing agent with an NCO content of ≥20%, and has unique and superior weather resistance, heat resistance, gloss retention and color retention. The highly unsaturated structure of (-NCO) makes its charge distribution uneven, resulting in nucleophilic centers and electrophilic centers, which determines that it has high reactivity and can react with hydroxyl groups in polyurethane. At the same time, when mixed with component A, it can synergistically react with carbodiimide, thereby increasing the subsequent strength of the polyurethane adhesive, and the overall performance is more superior, and the temperature resistance can reach above 100°C.

[0039] In addition, the present invention provides a preparation method of the two-component automotive interior spray adhesive, comprising the following steps: stirring and mixing an aqueous polyolefin dispersion and an aqueous chlorinated polypropylene emulsion, adding a multifunctional auxiliary agent and stirring, adjusting the pH value, and then adding an aqueous polyurethane emulsion and mixing evenly to obtain a mixture M; adding an adhesion promoter, nano-silicon dioxide, a thickener, a wetting agent, a defoamer, a preservative, and an anti-hydrolysis cross-linking agent to the mixture M and stirring evenly, adding a thickener to adjust the viscosity, filtering out the glue, and obtaining the A component; taking an isocyanate cross-linking agent to obtain the B component.

[0040] Preferably, the adjusted pH value is 7-8; the adjusted viscosity range is 7000±2000cps.

[0041] The viscosity of the present invention is obtained by testing at a room temperature of 25° C., with a viscometer using a No. 3 rotor and a rotation speed of 12r.

[0042] Furthermore, the present invention provides the application of the two-component automotive interior spray adhesive in automotive interiors; the present invention provides the application of the two-component automotive interior spray adhesive in the interior decoration parts of components such as automotive ceilings, carpets, floor mats, instrument panels, and door inner panels.

[0043] Compared with the prior art, the beneficial effects of the present invention are:

[0044] The present invention introduces a water-based polyolefin dispersion liquid and a water-based chlorinated polypropylene emulsion containing fluorine or silicon monomers into the water-based polyurethane spray adhesive. Compared with other low surface energy emulsions, the water-based polyolefin dispersion liquid and the water-based chlorinated polypropylene themselves have olefin structures, which are closer to the structure of PP, which is also an olefin, and can significantly reduce the surface energy of the colloid. The adhesion promoter dedicated to the PP substrate is used to synergistically improve the adhesion to the PP, making the strength higher. The fast-crystallizing polyurethane emulsion gives the glue main body bonding performance and accelerates the bonding speed.

[0045] The invention introduces nano silicon dioxide into the main emulsion to reduce the surface energy and polarity of the aqueous polyurethane emulsion and improve the mechanical properties of the colloid; adds a suitable wetting agent into the spray adhesive component to further reduce the surface energy of the aqueous emulsion, thereby enhancing the wettability of the aqueous emulsion; and adds an anti-hydrolysis cross-linking agent and an isocyanate cross-linking agent to ensure the final bonding strength and moisture and heat resistance of the emulsion, thereby achieving the purpose of bonding low surface energy materials, making the emulsion suitable for coating low surface energy material accessories for automobile interior decoration, and taking both economy and environmental protection into consideration.

[0046] The present invention takes into account both bonding strength and high temperature resistance, and optimizes and adjusts the composition and weight of each raw material of the two-component automotive interior spray adhesive. The main body of the base material is an aqueous polyurethane emulsion, and at the same time, an aqueous chlorinated polypropylene emulsion and an aqueous polyolefin dispersion are introduced, which are emulsions that are similar to PP in structure and can simultaneously reduce the surface energy of the system. Among them, the total proportion of the chlorinated polypropylene emulsion and the aqueous polyolefin dispersion does not exceed the main body content of the base material. The present invention not only improves the bonding strength to low surface energy substrates and improves the adhesion of the spray adhesive to PP and interior fabrics through specific weight adjustment, but also improves the final bonding strength and moisture and heat resistance, so that the spray adhesive of the present invention has a wider application range and better performance.

[0047] When the two-component automotive interior spray adhesive provided by the present invention is used, component A and component B are mixed, and the hexamethylene diisocyanate in component B and the carbodiimide in component A synergistically cross-link to form a cross-linked network, thereby reducing the swelling rate and further improving the bonding strength, weather resistance and non-yellowing properties of the colloid. After spraying, component B can react with water vapor in the air and active groups (such as hydroxyl groups, carboxyl groups, etc.) contained in component A, thereby greatly improving the bonding strength and heat resistance of the spray adhesive. DETAILED DESCRIPTION

[0048] In order to better illustrate the purpose, technical scheme and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments. Its purpose is to understand the content of the present invention in detail, rather than to limit the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Unless otherwise specified, the experimental reagents and instruments designed for the implementation and comparative examples of the present invention are all commonly used ordinary reagents and instruments, which can be obtained from commercial channels. In the implementation and comparative examples, the experimental methods used are conventional methods unless otherwise specified; and unless otherwise specified, the raw materials used in parallel experiments are the same batch of raw materials.

[0049] The raw materials used in the present invention are further described:

[0050] Waterborne polyurethane emulsion: U56, Covestro;

[0051] Water-based chlorinated polypropylene emulsion: SUPERCHLON E-503, Nippon Paper;

[0052] Waterborne polyolefin dispersion: AE-6097, Dow;

[0053] Adhesion promoter: EH801, Toyobo;

[0054] Nano-silicon dioxide: Ecosol A200, Ecosol;

[0055] Thickener: Gel 0625, A mixture of Gel 0620, 7:3 by weight, Bocherth;

[0056] Multifunctional additive: AMP95, Dow;

[0057] Wetting agent: SURFYNOL 440, Evonik;

[0058] Defoaming agent: TEGO Airex 902W, Digo;

[0059] Preservative: D7LT, LANXESS;

[0060] Anti-hydrolysis crosslinker: baltanex W02, BASF;

[0061] Isocyanate crosslinker: hexamethylene diisocyanate-Desmodur DN, Covestro;

[0062] Water-based chlorinated polypropylene emulsion: SUPERCHLON E-415, Nippon Paper;

[0063] Waterborne polyolefin dispersion: AE-502, Dow;

[0064] The defoaming agent is polyether: Z-530, Rebot;

[0065] Examples 1-9 and Comparative Examples 1-6

[0066] The present invention provides a two-component automotive interior spray adhesive, comprising a component A and a component B; the components and weight portions of the component A and the component B are selected as shown in Table 1. The present invention provides a preparation method of the two-component automotive interior spray adhesive, comprising the following steps:

[0067] The aqueous polyolefin dispersion and the aqueous chlorinated polypropylene emulsion are stirred and mixed, a multifunctional additive is added and stirred, the pH value is adjusted to 7-8, and then the aqueous polyurethane emulsion is added and mixed evenly to obtain a mixture M;

[0068] Add adhesion promoter, nano silicon dioxide, thickener, wetting agent, defoamer, preservative, anti-hydrolysis crosslinking agent to the mixture M and stir evenly, add thickener to adjust the viscosity to 7000±2000cps / 25℃, S3# / 12r, filter out the glue, and obtain the A component;

[0069] Take an isocyanate crosslinking agent to obtain the B component.

[0070] Table 1

[0071]

[0072]

[0073] Example 6

[0074] This embodiment provides a two-component automotive interior spray adhesive, which is different from Embodiment 1 only in that: in the A component, the aqueous polyolefin dispersion is AE-502, and the contents of other components and the preparation methods remain unchanged.

[0075] Example 7

[0076] This embodiment provides a two-component automotive interior spray adhesive, which is different from Embodiment 1 only in that: in the component A, the water-based chlorinated polypropylene emulsion is SUPERCHLON E-415, and the contents and preparation methods of other components remain unchanged.

[0077] Example 8

[0078] This embodiment provides a two-component automotive interior spray adhesive, which is different from Embodiment 1 only in that in the component A, the defoaming agent is polyether Z-530, and the contents of other components and the preparation methods remain unchanged.

[0079] Example 9

[0080] The present embodiment provides a two-component automotive interior spray adhesive, comprising the following components in parts by weight: 65 parts of aqueous polyurethane emulsion, 17.5 parts of aqueous chlorinated polypropylene emulsion, 17.5 parts of aqueous polyolefin dispersion, 5 parts of adhesion promoter, 3 parts of nano-silicon dioxide, 0.3 parts of thickener, 0.05 parts of multifunctional additive, 0.3 parts of wetting agent, 0.2 parts of defoaming agent, 0.05 parts of preservative, and 0.3 parts of anti-hydrolysis crosslinking agent. The B component comprises the following components in parts by weight: 3 parts of isocyanate crosslinking agent.

[0081] Performance Testing

[0082] The spray glue prepared in each embodiment and comparative example was subjected to characterization test, and the test method was as follows:

[0083] (1) Appearance: Observe the color, uniformity and state of the spray glue.

[0084] (2) Solid content test: The solid content of the spray glue is tested using an adhesive solid content tester. The adhesive solid content tester evaporates the moisture and volatiles in the spray glue by heating. The percentage of the remaining solid weight after heating to the weight of the spray glue before heating is called the solid content.

[0085] (3) Wetting ability test: Use a fully automatic surface tension tester to test the surface tension of the spray glue.

[0086] (4) Viscosity test: Use a rotational viscometer to test the viscosity of the spray glue.

[0087] (5) High temperature resistance test: spray glue at 120g / m 3 The coating was sprayed on the PP substrate and PVC composite cotton at a rate of 1.34°C, dried at 70°C for 7 min, and the adhesive surfaces of the two were relatively bonded at 55°C and pressed at 0.2MPa for 15s to obtain PP / PVC composite cotton samples. The prepared samples were placed in an oven at 90°C and observed for degumming after 3 days.

[0088] (6) Bond strength test: Spray glue at 120g / m3 The samples were sprayed on the PP substrate and PVC composite cotton at a rate of 100 mm / min, dried at 70°C for 7 min, and the adhesive surfaces of the two were relatively fitted at 55°C and pressed at 0.2 MPa for 15 s to obtain PP / / PVC composite cotton samples. The prepared samples were cut into small pieces with a width of 25 mm and a length of 100 mm, and then subjected to a 180° peel strength test at a rate of 300 mm / min.

[0089] (7) Moisture and heat resistance test: spray the glue at 120g / m 3 The samples were sprayed on the PP substrate and PVC composite cotton at a rate of 50°C and dried at 70°C for 7 minutes. The adhesive surfaces of the two were relatively fitted at 55°C and then pressed at 0.2MPa for 15 seconds to obtain PP / / PVC composite cotton samples. The prepared samples were placed in a high and low temperature humidity test box with the parameters set at 50°C and 95%RH. After 7 days, whether there was degumming was observed.

[0090] The test results are shown in Table 2.

[0091] Table 2

[0092]

[0093]

[0094] As can be seen from Table 2, the spray adhesives prepared in the embodiments of the present invention are all white liquids with a solid content of 49-51% and a viscosity range of 6500-7500 cps / 25°C.

[0095] From the comparison of Examples 1-5, it can be seen that the sprayed PP / PVC composite cotton sample prepared in the embodiment of the present invention remains intact without any bouncing phenomenon after being placed at 90°C for 3 days, and the sample remains intact without any bouncing phenomenon after being placed at 50°C and 95% RH for 7 days. The peel strength of the PP / PVC composite cotton sample is ≥16N / 25mm, and the obtained sprayed adhesive has excellent bonding performance and high temperature resistance.

[0096] It can be seen from the spray adhesives prepared in Example 1, Comparative Examples 1-2, and Comparative Examples 5-6 that in component A, the mass percentage of the aqueous polyurethane emulsion, the total mass percentage of the aqueous chlorinated polypropylene emulsion, and the aqueous polyolefin dispersion, as well as the weight ratio of the aqueous chlorinated polypropylene emulsion and the aqueous polyolefin dispersion will affect the performance of the finally prepared two-component automotive interior spray adhesive. When the specific combination of the present invention is not used, the PP / PVC composite cotton samples are placed at 90°C for 3 days and at 50°C and 95% RH for 7 days. After being placed, the peeling force is small and does not meet the requirements.

[0097] From the comparison among Example 1, Examples 6-8 and Comparative Examples 3-4, it can be seen that the components of the present invention are indispensable.

[0098] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A two-component automotive interior spray adhesive, characterized in that: The invention comprises component A and component B; the component A comprises the following components in parts by weight: 50-70 parts of aqueous polyurethane emulsion, 10-30 parts of aqueous chlorinated polypropylene emulsion, 10-30 parts of aqueous polyolefin dispersion, 2-5 parts of adhesion promoter, 1.5-5 parts of nano silicon dioxide, 0.1-0.3 parts of thickener, 0.01-0.1 parts of multifunctional auxiliary agent, 0.2-0.5 parts of wetting agent, 0.05-0.2 parts of defoaming agent, 0.05-0.2 parts of preservative and 0.2-0.5 parts of anti-hydrolysis crosslinking agent; the component B comprises the following components in parts by weight: 2-5 parts of isocyanate crosslinking agent.

2. The two-component automotive interior spray adhesive according to claim 1, characterized in that: In the component A, the mass percentage of the aqueous polyurethane emulsion is 55-65%.

3. The two-component automotive interior spray adhesive according to claim 1, characterized in that: The weight ratio of the aqueous chlorinated polypropylene emulsion to the aqueous polyolefin dispersion is 1:

1.

4. The two-component automotive interior spray adhesive according to claim 1, characterized in that: Including at least one of the following (a)-(k): (a) the aqueous polyurethane emulsion is at least one of U53, U54, U56 and U58; (b) the aqueous chlorinated polypropylene emulsion is at least one of SUPERCHLON E-415, SUPERCHLON E-480T, and SUPERCHLONE-503; (c) the aqueous polyolefin dispersion is at least one of AE-202, AE-301, AE-502, and AE-6097; (d) the adhesion promoter is at least one of EH801, CP347W, and CP349W; (e) the nano silicon dioxide is at least one of EcosolA200 and HIFULL HL200; (f) the thickener is at least one of an associative polyurethane thickener and an alkali-swellable emulsion thickener; (g) the multifunctional auxiliary agent is AMP95; (h) the wetting agent is at least one of an acetylenediol ethoxy wetting agent and a polysiloxane wetting agent; (i) the defoamer is at least one of a silicone defoamer and a polyether defoamer; (g) the preservative is D7LT fungicide; (k) The anti-hydrolysis cross-linking agent is a carbodiimide anti-hydrolysis cross-linking agent.

5. The two-component automotive interior spray adhesive according to claim 1, characterized in that: The isocyanate cross-linking agent is hexamethylene diisocyanate.

6. A method for preparing a two-component automotive interior spray adhesive as claimed in any one of claims 1 to 5, characterized in that: The steps include: The aqueous polyolefin dispersion and aqueous chlorinated polypropylene emulsion are stirred and mixed, a multifunctional auxiliary agent is added and stirred, the pH value is adjusted, and then the aqueous polyurethane emulsion is added and mixed evenly to obtain a mixture M; an adhesion promoter, nano-silicon dioxide, a thickener, a wetting agent, a defoamer, a preservative, and an anti-hydrolysis cross-linking agent are added to the mixture M and stirred evenly, a thickener is added to adjust the viscosity, and the glue is filtered out to obtain the A component; an isocyanate cross-linking agent is taken to obtain the B component.

7. The method for preparing a two-component automotive interior spray adhesive according to claim 6, characterized in that: The adjusted pH value is 7-8; the adjusted viscosity range is 7000±2000cps.

8. Use of the two-component automobile interior spray adhesive as claimed in any one of claims 1 to 5 in automobile interior.

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