Flocking glue as well as preparation method and application thereof

Abstract

The invention belongs to the field of adhesives, and relates to a flocking adhesive, and a preparation method and application thereof. The flocking adhesive comprises a first component and a second component in a mass ratio of 100: (5-20). The first component comprises 10-40 parts by weight of a VAE emulsion, 30-50 parts by weight of an anionic waterborne polyurethane emulsion and 50-70 parts by weight of an acrylic emulsion, and the second component comprises 1-5 parts by weight of a thickening agent, 30-80 parts by weight of a film forming aid and 10-25 parts by weight of a conductive aid. The conductive auxiliary agent is a non-quaternary ammonium type alkylamine salt. Various emulsions and thickeners are matched, so that the flocking adhesive has higher initial viscosity, fluff is quickly adsorbed and preliminarily fixed on the surface of a base material, and the flocking speed is increased. In addition, the non-quaternary ammonium type alkylamine salt can effectively improve the conductivity of the flocking glue, increase the conductivity of a glue layer in the flocking process, optimize charge distribution in an electrostatic field and enhance the directional traction force of the electric field on the fluff, so that the motion track of vertically implanting the fluff into the glue layer is more stable and rapid, and the flocking speed is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of adhesives, and specifically to a flocking adhesive, a preparation method thereof, and an application thereof. Background Art

[0002] Flocking is a surface processing technology that vertically implants short fibers / velvet into the surface of a flocking adhesive layer through the action of an electrostatic field. Its core principle is to use the electric field force to align the velvet in a specific direction and firmly adhere it to the substrate. This process is widely used in fields such as textiles, packaging, and automotive interiors, and can endow materials with functions such as wear resistance, noise reduction, anti-slip, and decoration.

[0003] In the field of automotive interior manufacturing, the flocking process is deeply applied to the surface treatment of components such as instrument panels, door panels, seat backs, storage compartments, ceilings, and armrest boxes. Through the flocking process, a uniform and delicate short velvet layer can be formed on complex curved surfaces or irregular structures, significantly improving the tactile comfort and visual premium. In addition, the flocking layer can effectively absorb vibration noise, reduce component friction noise, and has functions such as anti-slip and anti-reflection, meeting the requirements of modern cars for driving quality and safety. With the rapid development of new energy vehicles and intelligent cockpits, the penetration rate of flocked interiors in cars continues to climb, further boosting the demand for large-scale and efficient production.

[0004] However, the current production efficiency of automotive interior flocking still lags behind the industry's upgrade pace. The insufficient flocking speed directly leads to an extended processing cycle for individual automotive interior products and a decrease in equipment utilization rate. In mass production, it is easy to form a production capacity bottleneck, increasing the comprehensive manufacturing cost. In addition, the low-speed flocking process limits the automotive manufacturers' ability to quickly respond to market demands. Especially in the production of customized interiors or the trial production of new models, it may affect product iteration and delivery timeliness due to the lagging production rhythm. Therefore, it is necessary to develop new materials and technologies suitable for high-speed flocking processes to improve the flocking speed of automotive interiors. Summary of the Invention

[0005] (I) Technical Problems to be Solved

[0006] To solve the problem of low flocking speed in the existing technology, the present invention provides a flocking adhesive, a preparation method thereof, and an application thereof.

[0007] (II) Technical Solutions

[0008] To achieve the above object, the main technical solutions adopted by the present invention include:

[0009] In the first aspect, the present invention provides a flocking adhesive, which includes a first component and a second component; the mass ratio of the first component to the second component is 100:(5 - 20);

[0010] By weight, the first component comprises 10-40 parts of VAE emulsion, 30-50 parts of anionic aqueous polyurethane emulsion and 50-70 parts of acrylic emulsion; the second component comprises 1-5 parts of thickener, 30-80 parts of film-forming aid and 10-25 parts of conductive aid;

[0011] The conductive aid is a non-quaternary ammonium alkylamine salt.

[0012] For the flocking adhesive as described above, preferably, the solid content of the first component is 45-52% and the viscosity is 3000-8000 mPa·s.

[0013] For the flocking adhesive as described above, preferably, the mass ratio of the first component to the second component is 100:15;

[0014] By weight, the first component comprises 25 parts of VAE emulsion, 40 parts of anionic aqueous polyurethane emulsion and 60 parts of acrylic emulsion; the second component comprises 3 parts of thickener, 55 parts of film-forming aid and 20 parts of conductive aid.

[0015] For the flocking adhesive as described above, preferably, the non-quaternary ammonium alkylamine salt is one or more of triethylamine hydrochloride, dimethylamine methanesulfonate, ethylamine nitrate, methylamine hydrochloride and trioctylamine trifluoromethanesulfonate.

[0016] For the flocking adhesive as described above, preferably, the thickener is an aqueous polyurethane thickener and the film-forming aid is alcohol ester 12.

[0017] For the flocking adhesive as described above, preferably, the glass transition temperature of the VAE emulsion is -2-15°C, the activation temperature of the anionic aqueous polyurethane emulsion is 20-60°C, and the glass transition temperature of the acrylic emulsion is 10-40°C.

[0018] In a second aspect, the present invention provides a preparation method of the above flocking adhesive, comprising the following steps:

[0019] S1: Mix the VAE emulsion, anionic aqueous polyurethane emulsion and acrylic emulsion evenly to obtain the first component;

[0020] S2: Mix the thickener, film-forming aid and conductive aid evenly to obtain the second component;

[0021] S3: While stirring, add the second component to the first component. After the addition is completed, heat and stir the mixed system under vacuum to obtain the flocking adhesive.

[0022] For the preparation method of the flocking adhesive as described above, preferably, in step S3, the addition time of the second component lasts for 20 min or more.

[0023] The preparation method of the flocking glue as described above, preferably, in step S3, the heating temperature is 40-60°C, and the stirring time under vacuum is 30-50 min.

[0024] In a third aspect, the present invention also provides an application of the above-mentioned flocking glue or the flocking glue prepared by the above-mentioned preparation method in the preparation of automotive interiors.

[0025] (III) Beneficial effects

[0026] First, in the flocking glue of the present invention, the combination of VAE emulsion, anionic aqueous polyurethane emulsion, acrylic emulsion and thickener can make the flocking glue into an adhesive layer system with high initial viscosity. This high initial viscosity can enable the fluff to be quickly adsorbed and preliminarily fixed on the surface of the substrate under the action of an electric field, so as to reduce the time of fluff rebound or secondary adjustment caused by insufficient adhesive layer viscosity in the traditional flocking process, thereby directly shortening the processing cycle of a single flocking and improving the flocking speed. Compared with the flocking glue with lower initial viscosity in the prior art, when using the flocking glue with high initial viscosity in the present invention, the flocking speed can be increased by 20-35%.

[0027] Second, the non-quaternary ammonium alkylamine salt can effectively improve the conductivity of the flocking glue. This high conductivity of the flocking glue can optimize the charge distribution in the electrostatic field, enhance the directional traction force of the electric field on the fluff, and make the movement trajectory of the fluff vertically implanted into the adhesive layer more stable and fast, thereby improving the flocking speed. Compared with the flocking glue with higher initial viscosity but without adding non-quaternary ammonium alkylamine salt, when using the flocking glue with a conductive additive in the present invention, the flocking speed can be further increased by 20-50%. Specific embodiments

[0028] In order to better explain the present invention for easy understanding, the present invention will be described in detail below in conjunction with specific embodiments.

[0029] The present invention provides a flocking glue, which includes a first component and a second component. Among them, the mass ratio of the first component to the second component is 100:(5-20). Calculated by weight, the first component includes 10-40 parts of VAE emulsion, 30-50 parts of anionic aqueous polyurethane emulsion and 50-70 parts of acrylic emulsion, and the second component includes 1-5 parts of thickener, 30-80 parts of film-forming aid and 10-25 parts of conductive aid. The conductive aid in the present invention is a non-quaternary ammonium alkylamine salt.

[0030] In the long-term research and experiments, the researchers of the present invention found that the initial viscosity and conductivity of the flocking adhesive have a significant impact on the flocking speed: when the initial viscosity of the flocking adhesive is too low, the fluffed hairs are prone to rebound after implantation, and repeated flocking is required to cover the substrate. Insufficient conductivity will cause a delay in the polarization effect of the electrostatic field and prolong the time for the directional arrangement of the fluffed hairs. These two factors are the fundamental reasons for the low efficiency of the existing flocking process.

[0031] Based on the above findings, the flocking adhesive of the present invention simultaneously includes a VAE emulsion, an anionic aqueous polyurethane emulsion, an acrylic emulsion, and a thickener. The multiple components cooperate to make the flocking adhesive a glue layer system with high initial viscosity. This high initial viscosity enables the fluffed hairs to be quickly adsorbed and preliminarily fixed on the surface of the substrate under the action of the electric field, so as to reduce the time for the rebound or secondary adjustment of the fluffed hairs caused by insufficient viscosity of the glue layer in the traditional flocking process, thereby directly shortening the processing cycle of a single flocking and improving the flocking speed. Compared with the flocking adhesive with relatively low initial viscosity in the prior art, when using the flocking adhesive with high initial viscosity in the present invention, the flocking speed can be increased by 20 - 35%.

[0032] The initial viscosity, that is, the tack (tack refers to the adhesion of the adhesive tape to an object when there is a short contact between the object and the adhesive surface of the adhesive tape with a small pressure), represents the ability of the flocking adhesive to adhere to the fluffed hairs.

[0033] Based on the above findings, the present invention also improves the conductivity of the flocking adhesive through a non-quaternary ammonium alkylamine salt. This high conductivity of the flocking adhesive can optimize the charge distribution in the electrostatic field, enhance the directional traction force of the electric field on the fluffed hairs, and make the movement trajectory of the fluffed hairs vertically implanted into the glue layer more stable and fast, thereby improving the flocking speed. Compared with the flocking adhesive with relatively high initial viscosity but without adding a non-quaternary ammonium alkylamine salt, when using the flocking adhesive with a conductive additive in the present invention, the flocking speed can be further increased by 20 - 50%.

[0034] An anionic aqueous polyurethane emulsion refers to a functional group with a negative charge on the polyurethane molecular chain, such as carboxylate (-COO-) or sulfonate (-SO3-), which enables the particles to be stably dispersed in water without agglomeration. Compared with traditional solvent-based polyurethanes, aqueous polyurethane emulsions have lower volatile organic compound (VOC) emissions, and are therefore more environmentally friendly and safe.

[0035] If the anionic aqueous polyurethane emulsion or the acrylic emulsion is not added, or the proportion is lower than the above range, the initial viscosity of the flocking adhesive will be significantly reduced, resulting in the inability to effectively improve the flocking speed. If the proportion of the anionic aqueous polyurethane emulsion or the acrylic emulsion exceeds the above range, it will cause the initial viscosity of the flocking adhesive to be too high, and it cannot be evenly distributed on the base layer, affecting the flocking effect. If the addition amount of the conductive additive is lower than the above range, the improvement of the flocking speed will be reduced.

[0036] Preferably, the solid content of the first component is 45-52%, and the viscosity is 3000-8000 mPa·s.

[0037] Preferably, in the flocking adhesive of the present invention, the mass ratio of the first component to the second component is 100:15. By weight, the first component includes 25 parts of VAE emulsion, 40 parts of anionic aqueous polyurethane emulsion, and 60 parts of acrylic emulsion, and the second component includes 3 parts of aqueous polyurethane thickener, 55 parts of film-forming aid, and 20 parts of conductive aid.

[0038] Preferably, the non-quaternary ammonium alkylamine salt is triethylamine hydrochloride ((C2H5)3NH + Cl−, formed by the reaction of triethylamine with hydrochloric acid), dimethylamine methylsulfonate ((CH3)2NH2 + CH3SO3 - , formed by the reaction of dimethylamine with methylsulfonic acid), ethylamine nitrate (C2H5NH3 + NO3 - , formed by the reaction of ethylamine with nitric acid), methylamine hydrochloride (CH3NH3 + Cl - , the hydrochloride of methylamine), and trioctylamine trifluoromethanesulfonate ((C8H 17 )3NH + CF3SO3 - , the salt formed by the reaction of trioctylamine with trifluoromethanesulfonic acid), or one or more of them. The film-forming aid is preferably alcohol ester 12.

[0039] The nitrogen atom of the non-quaternary ammonium alkylamine salt is not connected to four carbon chains / groups, but less than four, that is, it can be a salt formed by primary, secondary, or tertiary amines. These amines can react with acids to form corresponding amine salts under acidic conditions. For example: primary amine salt (R-NH3+X - ), secondary amine salt (R2NH2+X - ), or tertiary amine salt (R3NH+X - ), where X - represents an anion, such as chloride ion (Cl - ), bromide ion (Br - ), nitrate (NO3 - ), trifluoromethanesulfonate (OTf - ), tetrafluoroborate ion (BF4 - ), etc.

[0040] More preferably, the glass transition temperature of the VAE emulsion used in the present invention is -2-15 °C, the activation temperature of the anionic aqueous polyurethane emulsion is 20-60 °C, and the glass transition temperature of the acrylic emulsion is 10-40 °C.

[0041] The present invention also provides a method for preparing a flocking adhesive, comprising the following steps:

[0042] S1: Mix 10 - 40 parts of VAE emulsion, 30 - 50 parts of anionic aqueous polyurethane emulsion, and 50 - 70 parts of acrylic emulsion uniformly to obtain a first component.

[0043] S2: Mix 1 - 5 parts of an aqueous polyurethane thickener, 30 - 80 parts of a film - forming aid, and 1 - 25 parts of a conductive aid uniformly to obtain a second component.

[0044] S3: While stirring, add the second component to the first component. After the addition is complete, heat and stir the mixed system under a vacuum state to obtain the flocking adhesive.

[0045] In the above step S3, the second component can be added to the first component by means of slow dropping to avoid destroying the environmental balance in the first component. Similarly, continuous stirring during the dropping of the second component is also to avoid destroying the environmental balance in the first component and prevent precipitation of the first component. Preferably, the dropping time of the second component needs to last for 20 min or more.

[0046] Further preferably, in step S3, the heating temperature is 40 - 60 °C, and the stirring time under the vacuum state is 30 - 50 min.

[0047] The conductivity of the ordinary flocking adhesive in the prior art is generally 900 - 1000 uS / cm, while the conductivity of the flocking adhesive prepared by the present invention can reach 2600 - 3000 uS / cm. In addition, the flocking adhesive prepared by the present invention has good stability and can be stored at room temperature for 6 - 8 months.

[0048] During the mixing process of the first component and the second component, bubbles may be introduced. The existence of bubbles will cause the surface of the flocked adhesive to be uneven after coating, affecting the uniformity of fluff implantation and the stability of the conductive performance. In step S3, the vacuum environment can effectively eliminate the bubbles in the system and avoid residual pores in the colloid. In addition, the vacuum condition can also reduce the contact between the system and oxygen, prevent the oxidative cross - linking of the active components in the emulsion, and avoid skinning.

[0049] In addition, in step S3, heating can reduce the viscosity of the emulsion, enhance the molecular diffusion rate between the first component and the second component, and improve the homogeneity of the multiphase system. The film - forming aid can promote the close packing of emulsion particles under heating to form a preliminary gel film network and enhance the initial adhesion strength of the flocking adhesive. The non - quaternary ammonium alkylamine salt is more easily and uniformly dispersed under the action of heating, avoiding uneven conductivity caused by local agglomeration.

[0050] The present invention selects non-quaternary ammonium alkylamine salts as conductive aids, which exhibit multi-dimensional advantages compared with traditional solid conductive agents (such as graphene), quaternary ammonium salts, or conductive polymers (such as polyaniline, polypyrrole, etc.). The non-quaternary ammonium alkylamine salts are soluble salts that can completely dissolve in aqueous emulsions to form a homogeneous system, avoiding the agglomeration problem caused by the insolubility of solid conductive agents or the sheet aggregation phenomenon caused by the rigidity of the molecular chains of conductive polymers, thereby ensuring that conductive ions are evenly dispersed in the colloid with high stability.

[0051] The ionic conduction mechanism of non-quaternary ammonium alkylamine salts enables rapid charge transfer through free anions (such as Cl - , NO3 - ), with sensitive conductive response and performance that can be flexibly controlled by adjusting the salt concentration. In contrast, solid conductive agents relying on electron conduction through physical contact require high filling amounts and are prone to damaging the mechanical properties of the colloid. In addition, non-quaternary ammonium alkylamine salts have excellent compatibility with organic emulsion components such as VAE, polyurethane, and acrylic acid, without causing phase separation or viscosity fluctuations. While maintaining the initial adhesion strength of the flocking glue, they can also avoid problems such as insufficient dispersibility or decreased conductive efficiency caused by the hydrophobic long chains of quaternary ammonium salts.

[0052] Furthermore, non-quaternary ammonium alkylamine salts can be directly dissolved in the system without complex dispersion processes, with a simple production process. Some salts (such as triethylamine hydrochloride) are also environmentally friendly, with better biodegradability than long-chain quaternary ammonium salts and intractable conductive polymers. Generally speaking, non-quaternary ammonium salts achieve a balance in terms of conductive efficiency, processing convenience, system compatibility, and environmental safety, making them an ideal choice for optimizing both the adhesion performance and conductive function of flocking glue.

[0053] The flocking glue of the present invention and the flocking glue prepared by the above preparation method can be used for preparing automotive interiors.

[0054] In order to further clarify the solution of the present invention and its technological progressiveness, the following is described in conjunction with specific examples and technical effects.

[0055] Example 1

[0056] This example provides a preparation method for a flocking glue, which includes the following steps:

[0057] S1: Mix 25 parts of VAE emulsion, 40 parts of anionic aqueous polyurethane emulsion, and 60 parts of acrylic emulsion evenly to obtain the first component. Among them, the solid content of the first component is 48%, and the viscosity is 5500 mPa·s.

[0058] S2: Mix 3 parts of an aqueous polyurethane thickener, 55 parts of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, and 20 parts of methylamine hydrochloride evenly to obtain the second component.

[0059] S3: While continuously stirring, slowly drop the second component into the first component over a dropping time of 20 min. After the dropping of the second component is completed, heat the mixed system to 50 °C under a vacuum state while stirring for 40 min to obtain the flocking adhesive. In this example, the mass ratio of the first component to the second component is 100:15, and the amounts of each reagent are in parts by weight.

[0060] Example 2

[0061] This example provides a method for preparing a flocking adhesive, which includes the following steps:

[0062] S1: Mix 10 parts of VAE emulsion, 30 parts of anionic aqueous polyurethane emulsion, and 50 parts of acrylic emulsion evenly to obtain the first component. Among them, the solid content of the first component is 45%, and the viscosity is 3000 mPa·s.

[0063] S2: Mix 1 part of an aqueous polyurethane thickener, 30 parts of 2,2,4-trimethyl-1,3-pentanediol isobutyrate, and 10 parts of triethylamine hydrochloride evenly to obtain the second component.

[0064] S3: While continuously stirring, slowly drop the second component into the first component over a dropping time of 30 min. After the dropping of the second component is completed, heat the mixed system to 40 °C under a vacuum state while stirring for 50 min to obtain the flocking adhesive. In this example, the mass ratio of the first component to the second component is 100:5, and the amounts of each reagent are in parts by weight.

[0065] Example 3

[0066] This example provides a method for preparing a flocking adhesive, which includes the following steps:

[0067] S1: Mix 40 parts of VAE emulsion, 50 parts of anionic aqueous polyurethane emulsion, and 70 parts of acrylic emulsion evenly to obtain the first component. Among them, the solid content of the first component is 52%, and the viscosity is 8000 mPa·s.

[0068] S2: Mix 5 parts of an aqueous polyurethane thickener, 80 parts of 2,2,4-trimethyl-1,3-pentanediol isobutyrate, and 25 parts of dimethylamine methylsulfonate evenly to obtain the second component.

[0069] S3: While continuously stirring, slowly drop the second component into the first component over a dropping time of 30 min. After the dropping of the second component is completed, heat the mixed system to 60 °C under a vacuum state while stirring for 50 min to obtain the flocking adhesive. In this example, the mass ratio of the first component to the second component is 100:20, and the amounts of each reagent are in parts by weight.

[0070] Example 4

[0071] This embodiment provides a preparation method of flocking glue, including the following steps:

[0072] S1: Mix 20 parts of VAE emulsion, 35 parts of anionic aqueous polyurethane emulsion and 55 parts of acrylic emulsion evenly to obtain the first component. Among them, the solid content of the first component is 49%, and the viscosity is 5300 mPa·s.

[0073] S2: Mix 2 parts of aqueous polyurethane thickener, 40 parts of ethylhexyl glycol acetate and 20 parts evenly to obtain the second component.

[0074] S3: Under continuous stirring, slowly drop the second component into the first component. The dropping time is 40 min. After the second component is completely dropped, heat the mixed system to 55°C under vacuum and stir for 35 min to obtain the flocking glue. In this embodiment, the mass ratio of the first component to the second component is 100:12, and the parts of each reagent are all parts by weight.

[0075] Example 5

[0076] This embodiment provides a preparation method of flocking glue, including the following steps:

[0077] S1: Mix 25 parts of VAE emulsion, 45 parts of anionic aqueous polyurethane emulsion and 58 parts of acrylic emulsion evenly to obtain the first component. Among them, the solid content of the first component is 50%, and the viscosity is 6500 mPa·s.

[0078] S2: Mix 4 parts of aqueous polyurethane thickener, 50 parts of ethylhexyl glycol acetate and 15 parts of trioctylamine trifluoromethanesulfonate evenly to obtain the second component.

[0079] S3: Under continuous stirring, slowly drop the second component into the first component. The dropping time is 30 min. After the second component is completely dropped, heat the mixed system to 45°C under vacuum and stir for 45 min to obtain the flocking glue. In this embodiment, the mass ratio of the first component to the second component is 100:18, and the parts of each reagent are all parts by weight.

[0080] Example 6

[0081] This embodiment provides a preparation method of flocking glue, including the following steps:

[0082] S1: Mix 29 parts of VAE emulsion, 43 parts of anionic aqueous polyurethane emulsion and 54 parts of acrylic emulsion evenly to obtain the first component. Among them, the solid content of the first component is 51%, and the viscosity is 7100 mPa·s.

[0083] S2: Mix 3 parts of waterborne polyurethane thickener, 48 parts of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, and 18 parts of the mixture of triethylamine hydrochloride and dimethylamine methanesulfonate evenly to obtain the second component. The mass ratio of triethylamine hydrochloride to dimethylamine methanesulfonate is 1:1.

[0084] S3: Under continuous stirring, slowly drop the second component into the first component. The dropping time is 35 min. After the dropping of the second component is completed, heat the mixed system to 46 °C under vacuum and stir for 38 min to obtain the flocking adhesive. In this example, the mass ratio of the first component to the second component is 100:16, and the parts of each reagent are all parts by weight.

[0085] Comparative Example 1

[0086] This comparative example provides a method for preparing a flocking adhesive, which is different from Example 1 in that the anionic aqueous polyurethane emulsion is not added.

[0087] Comparative Example 2

[0088] This comparative example provides a method for preparing a flocking adhesive, which is different from Example 1 in that the acrylic emulsion is not added.

[0089] Comparative Example 3

[0090] This comparative example provides a method for preparing a flocking adhesive, which is different from Example 1 in that the addition amount of trioctylamine trifluoromethanesulfonate is 5 parts.

[0091] Comparative Example 4

[0092] This comparative example provides a method for preparing a flocking adhesive, which is different from Example 1 in that 160 parts of VAE emulsion are used in step S1, the addition amount of the thickener in step S2 is 0, and the addition amount of trioctylamine trifluoromethanesulfonate is 5 parts.

[0093] Test the conductivity of the flocking adhesives prepared in Examples 1-6 and Comparative Examples 1-3 to obtain Table 1.

[0094] Table 1 Statistical Table of Conductivity of Flocking Adhesives in Examples 1-6 and Comparative Examples 1-3

[0095]

[0096]

[0097] Taking the flocking speed of Comparative Example 4 as a reference, after testing, within the same time, the flocking speed of Comparative Example 3 is increased by 35% compared with Comparative Example 4, and the flocking speeds of Comparative Example 1 and Comparative Example 2 are increased by 10% and 9.4% respectively compared with Comparative Example 4. The flocking speeds of Examples 1-6 are increased by 50%, 20%, 47.6%, 42%, 26.1% and 33% respectively compared with Comparative Example 3.

[0098] From the above results, it can be seen that the flocking glue of Comparative Example 4 has neither high initial viscosity nor high conductivity, and can be considered as a conventional flocking glue in the prior art. Comparative Example 3 has higher initial viscosity than Comparative Example 4, and the flocking speed is significantly improved compared with Comparative Example 4. The flocking glues of Examples 1-6 have both high initial viscosity and high conductivity. Compared with Comparative Example 3 which only has high initial viscosity, the flocking speed is further significantly improved. Although Comparative Examples 1-2 have high conductivity, they do not have high initial viscosity, and the flocking speed is not significantly improved compared with Comparative Example 4, indicating that only when both high initial viscosity and high conductivity are possessed can the flocking speed be significantly improved.

[0099] The flocking glues prepared in Examples 1-6 and Comparative Examples 1-3 were used to prepare the interior storage boxes of automobiles, and then the water resistance, abrasion resistance and heat resistance of the interior storage boxes of automobiles were tested to obtain Table 2.

[0100] Table 2 Statistical Table of Performance Tests of Interior Storage Boxes of Automobiles in Examples 1-6 and Comparative Examples 1-3

[0101]

[0102]

[0103] Note: The abrasion resistance in Table 2 represents the mass loss after applying a force of 1.5 kgf to the interior storage box of the automobile and rubbing it 500 times.

[0104] From Table 2, it can be seen that the interior storage boxes of automobiles prepared with the flocking glues of Examples 1-6 have good abrasion resistance, water resistance and heat resistance.

[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A flocking adhesive, characterized in that, It includes a first component and a second component; the mass ratio of the first component to the second component is 100:(5 - 20). By weight, the first component includes 10 - 40 parts of VAE emulsion, 30 - 50 parts of anionic aqueous polyurethane emulsion, and 50 - 70 parts of acrylic emulsion; the second component includes 1 - 5 parts of thickener, 30 - 80 parts of film-forming aid, and 10 - 25 parts of conductive aid. The conductive aid is a non-quaternary ammonium alkylamine salt.

2. The flock glue according to claim 1, wherein The solid content of the first component is 45 - 52%, and the viscosity is 3000 - 8000 mPa·s.

3. The flocking adhesive according to claim 1, wherein The mass ratio of the first component to the second component is 100:

15. By weight, the first component includes 25 parts of VAE emulsion, 40 parts of anionic aqueous polyurethane emulsion, and 60 parts of acrylic emulsion; the second component includes 3 parts of thickener, 55 parts of film-forming aid, and 20 parts of conductive aid.

4. The flocking adhesive according to claim 1, characterized in that: The non-quaternary ammonium alkylamine salt is one or several of triethylamine hydrochloride, dimethylamine methanesulfonate, ethylamine nitrate, methylamine hydrochloride, and trioctylamine trifluoromethanesulfonate.

5. The flock glue according to claim 1, characterized in that, The thickener is an aqueous polyurethane thickener, and the film-forming aid is alcohol ester 12.

6. The flock glue according to claim 1, wherein The glass transition temperature of the VAE emulsion is -2 - 15°C, the activation temperature of the anionic aqueous polyurethane emulsion is 20 - 60°C, and the glass transition temperature of the acrylic emulsion is 10 - 40°C.

7. A method for preparing the flocking adhesive according to any one of claims 1-6, characterized in that, It includes the following steps: S1: Mix the VAE emulsion, anionic aqueous polyurethane emulsion, and acrylic emulsion evenly to obtain the first component. S2: Mix the thickener, film-forming aid, and conductive aid evenly to obtain the second component. S3: While stirring, add the second component to the first component. After the addition is complete, heat and stir the mixed system under vacuum to obtain the flocking glue.

8. The preparation method of the flocking glue according to claim 7, characterized in that, In step S3, the addition time of the second component lasts for 20 min or more.

9. The preparation method of the flocking glue according to claim 7, characterized in that, In step S3, the heating temperature is 40 - 60°C, and the stirring time under vacuum is 30 - 50 min.

10. Application of the flocking glue according to any one of claims 1 - 6 or the flocking glue prepared by the preparation method according to any one of claims 7 - 9 in the preparation of automotive interiors.

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