CN119177093A

CN119177093A - Self-repairing microcapsule, self-repairing flocking adhesive, self-repairing flocking material and preparation method thereof

Info

Publication number: CN119177093A
Application number: CN202411263758.4A
Authority: CN
Inventors: 董贺翔; 马頔; 杨童; 宋云颖; 朱超
Original assignee: Xinji Baolong Technology Co ltd
Current assignee: Xinji Baolong Technology Co ltd
Priority date: 2024-09-10
Filing date: 2024-09-10
Publication date: 2024-12-24

Abstract

The application provides a self-repairing microcapsule, a self-repairing flocking adhesive, a self-repairing flocking material and a preparation method thereof, and relates to the technical field of flocking. The self-repairing microcapsule comprises the following raw materials, by weight, 15-25 parts of shell material monomers, 50-70 parts of self-repairing agents and 25-40 parts of emulsifying agents, wherein the self-repairing agents are mixtures formed by isocyanate and polyethylene glycol adipate according to the mass ratio of 4-5:5-6, and the shell material monomers are isocyanate. The self-repairing flocking adhesive comprises an adhesive matrix and self-repairing microcapsules. The preparation method of the self-repairing flocking material comprises the step of using a self-repairing flocking adhesive in a flocking process. The self-repairing flocking material is obtained by the flocking process. When the flocking layer is damaged by external force, microcapsule shells distributed in the adhesive are broken, the self-repairing agent in the microcapsule shells can be released to the damaged area, and the cracks or the damage are filled through reaction, so that the integrity and the functionality of the material are recovered.

Description

Self-repairing microcapsule, self-repairing flocking adhesive, self-repairing flocking material and preparation method thereof

Technical Field

The application relates to the technical field of flocking, in particular to a self-repairing microcapsule, a self-repairing flocking adhesive, a self-repairing flocking material and a preparation method thereof.

Background

Flocking technology, as a process for precisely implanting a fibrous material into a surface of a substrate, has been widely used in various industries, particularly in the fields of automotive interiors, high-end furniture, fashion clothing, and the like. The flocking layer is popular in the market because of its unique touch, good visual effect and excellent sound and heat insulation properties. However, with the frequent contact and rubbing of these products in daily use, the flock layer inevitably suffers from various forms of mechanical damage such as shedding of fibres, abrasion of the surface, and cracks due to long-term stress effects.

These injuries not only seriously affect the aesthetics of the flocked product, but also shorten its life, increase the replacement costs for the consumer, and also pose challenges to the manufacturer's brand image and market competitiveness. Therefore, how to effectively prolong the service life of the flocking layer and improve the capability of resisting mechanical damage of the flocking layer becomes a key technical problem to be solved in industry.

Disclosure of Invention

In order to solve the problem that the service life of the existing flocking layer is not long due to mechanical damage, the application provides a self-repairing microcapsule, a self-repairing flocking adhesive, a self-repairing flocking material and a preparation method thereof.

In a first aspect, the present application provides a self-repairing microcapsule, which adopts the following technical scheme:

A self-repairing microcapsule for self-repairing flocking material comprises the following raw materials, by weight, 15-25 parts of shell material monomer, 50-70 parts of self-repairing agent and 25-40 parts of emulsifying agent;

The self-repairing agent is a mixture formed by isocyanate and polyethylene glycol adipate according to a mass ratio of 4-5:5-6, and the shell material monomer is isocyanate.

Alternatively, the emulsifier may be Span 80 or Tween 80.

Optionally, the self-repairing microcapsule comprises the following raw materials in parts by weight, 20 parts of shell material monomer, 55 parts of self-repairing agent and 25 parts of emulsifier.

Optionally, the isocyanate comprises one or more of monoisocyanate, toluene Diisocyanate (TDI), diphenylmethane diisocyanate (MDI), isophorone diisocyanate (IPDI).

The self-repairing agent can be mixed in a water phase through an emulsifying agent, so that water-in-oil emulsion is formed, isocyanate serving as a shell material monomer can react with hydroxyl in water to form a polyurethane shell, the self-repairing agent is gradually coated by the shell in the shell forming process, and a core-shell structure with the self-repairing agent packaged inside and the polyurethane shell packaged outside is formed.

The self-repairing agent is prepared by uniformly mixing isocyanate and polyethylene glycol adipate (PES), wherein the polyethylene glycol adipate is preferably medium molecular weight PES (the molecular weight is usually between 2000 and 4000 g/mol), the mixture can generate chemical reaction to generate polyurethane when a shell structure is damaged, the reaction speed is high, the reaction can usually occur at room temperature to medium temperature (for example, 50 to 80 ℃), and the reactivity is suitable for being applied to the occasions of rapid curing and repairing. PES has good wear resistance and flexibility, when isocyanate and other components are crosslinked to form a polyurethane network after the shell of the self-repairing microcapsule is broken, PES is entangled or blended in the network, so that the flexibility and the ductility of the material can be improved, and the self-repairing microcapsule is suitable for self-repairing materials requiring higher flexibility or low temperature resistance.

Alternatively, the PES may be selected from the following brands: S1045, desmophen 631A or MILLESTER4004.

Optionally, the self-repairing microcapsule is prepared by the following preparation method:

step S11, mixing the self-repairing agent in an aqueous phase by using the emulsifying agent to form a water-in-oil emulsion;

Step S12, dropwise adding the shell material monomer into the water-in-oil emulsion, and performing emulsion polymerization reaction under the condition of stirring;

and step S13, obtaining the self-repairing microcapsule through filtering, washing and drying.

Optionally, in the step S11, the emulsification temperature is 25 ℃, the emulsification time is 30 minutes, the stirring speed is 1000rpm, in the step S12, the reaction temperature is 35 ℃, the reaction time is 2 hours, the stirring speed is 800rpm, and in the step S13, the drying temperature is 40 ℃, and the drying time is 12 hours.

The self-repairing agent can be wrapped in the polyurethane shell through the operation to form a stable microcapsule structure, the preparation method is simple and efficient, industrial production is easy, the size and the distribution of the microcapsules can be accurately controlled, and high-quality raw materials are provided for the subsequent preparation of the flocking adhesive.

In a second aspect, the application provides a self-repairing flocking adhesive, which adopts the following technical scheme:

the self-repairing flocking adhesive comprises an adhesive matrix and self-repairing microcapsules which are uniformly mixed, wherein the dosage of the self-repairing microcapsules is 10-20% of the mass of the adhesive matrix.

The adhesive not only has the basic performance of the traditional flocking adhesive, but also has a self-repairing function. By uniformly mixing the self-repairing microcapsules into the adhesive matrix, the aim of automatically repairing cracks and defects when the flocking material is damaged is achieved. This design significantly improves the durability and service life of the flocked material, reducing maintenance costs.

Optionally, the adhesive matrix comprises the following raw materials, by weight, 70-85 parts of polyurethane prepolymer, 5-15 parts of plasticizer, 3-6 parts of stabilizer and 2-5 parts of catalyst.

Optionally, the adhesive matrix comprises 75 parts of polyurethane prepolymer, 10 parts of plasticizer, 5 parts of stabilizer and 3 parts of catalyst.

The polyurethane prepolymer is prepared from polyol and diisocyanate, has unreacted complete isocyanate group or hydroxyl end group and other active groups, and after the self-repairing microcapsule is damaged and released, the active groups in the polyurethane prepolymer may react with isocyanate in the self-repairing agent to form new polyurethane network to fill the damaged area, and the plasticizer may be added to improve the flexibility and processing performance of the adhesive. In addition, the catalyst not only plays a role in accelerating reaction in the adhesive matrix, but also can accelerate the crosslinking reaction of the self-repairing agent and the polyurethane prepolymer in the adhesive matrix in the self-repairing process so as to improve the self-repairing reaction efficiency.

Optionally, 5-10 parts of reinforcing agent is also included in the adhesive matrix.

Optionally, 7 parts of a strengthening agent is also included in the adhesive matrix.

Optionally, the reinforcing agent is CNTs, nanocellulose, or PLA nanofibers.

The self-repairing flocking adhesive has the advantages that the reinforcing agent component is introduced into the adhesive matrix, the mechanical property of the self-repairing flocking adhesive can be enhanced, the final material is more durable, the stretching resistance, the tearing resistance and the bending resistance are improved, the nano fiber can effectively prevent crack growth when the material is stressed, so that the fracture toughness of the material is improved, the damage risk of the material in the use process is reduced, the interface bonding force between the adhesive layer and the flocking layer can be enhanced, the flocking layer is not easy to fall off under the action of external force, the service life of the material is prolonged, in addition, the nano fiber can form a stable network structure in the adhesive, the sedimentation of other fillers is prevented, and the uniformity and the stability of the material are improved.

Optionally, the self-repairing flocking adhesive is prepared by the following preparation method:

Step S21, uniformly stirring polyether polyol and diisocyanate, heating to 80-90 ℃, and keeping for 2 hours to form a polyurethane prepolymer with a hydroxyl terminal;

S22, cooling the polyurethane prepolymer to room temperature, adding a plasticizer, a stabilizer and a catalyst, and uniformly stirring;

Step S23, gradually adding the reinforcing agent into the product obtained in the step S22, and uniformly stirring to obtain the adhesive matrix;

and step S24, slowly and uniformly adding the self-repairing microcapsules into the adhesive matrix under the condition that the adhesive matrix is stirred at a low speed.

The self-repairing microcapsule is gradually added into the adhesive matrix in a slow and uniform way, and the stirring force can be controlled by using a low speed gear of a disperser or a stirrer to ensure that the microcapsules can be uniformly distributed in the adhesive matrix without being damaged.

Optionally, in the step S21, the molar ratio of the polyether polyol to the diisocyanate is preferably 1.2 to 1.5:1.

In the common polyurethane synthesis, the molar ratio of the polyether polyol to the diisocyanate is usually between 1:1 and 1:2, and the polyether polyol is excessively added in the process of forming the polyurethane prepolymer, so that enough hydroxyl groups can be provided in a reaction system, and the reaction between the self-repairing microcapsule and the isocyanate in the self-repairing agent after the self-repairing microcapsule is broken is realized, so that a new polyurethane network is formed. Meanwhile, the coexistence of the polyurethane prepolymer and the polyether polyol can provide a more complex network structure, and is beneficial to enhancing the mechanical property and the self-repairing property of the material.

Optionally, the polyether polyol comprises one or more of polypropylene oxide ether polyol (PPG), polytetrahydrofuran ether Polyol (PTMEG) and tetrahydrofuran-propylene oxide copolyol with molecular weight of 1500-2000.

Alternatively, the diisocyanate includes one or more of Toluene Diisocyanate (TDI), diphenylmethane-4, 4' -diisocyanate (MDI), isophorone diisocyanate (IPDI), hexamethylene Diisocyanate (HDI), para-phenylene diisocyanate (PPDI), xylylene Diisocyanate (XDI), 1, 4-cyclohexane diisocyanate (CHDI), and naphthalene-1, 5-diisocyanate (NDI).

Alternatively, in the step S22, the materials are stirred with a high-speed stirrer at a stirring speed of 2000rpm for 30 minutes to ensure uniform stirring of the materials.

Optionally, in step S23, the reinforcing agent is stirred at 25 ℃ for 0.5-1 hour using a high speed stirrer at a stirring speed of 2000rpm to ensure uniform distribution of the reinforcing agent in the adhesive matrix.

Optionally, in the step S24, the stirring speed of the adhesive matrix is 200-500rpm.

By limiting the stirring speed when adding the self-healing microcapsules, it is possible to help ensure uniform dispersion and stable mixing of the self-healing microcapsules in the adhesive matrix. Too high a stirring speed may lead to microcapsule breakage, and too low a stirring speed may not achieve adequate mixing. Thus, this limited range ensures both the mixing effect and avoids unnecessary losses.

In a third aspect, the application provides a method for preparing a self-repairing flocking material, which adopts the following technical scheme:

a preparation method of a self-repairing flocking material comprises the following steps:

Step S31, preprocessing a substrate;

step S32, uniformly coating the self-repairing flocking adhesive on the surface of the substrate, and standing;

Step S33, uniformly implanting a fiber material into the self-repairing flocking adhesive under the condition that the electric field intensity is 50 kV;

and step S34, performing heat curing treatment on the flocked product to obtain the finished product.

Alternatively, the step S31 is specifically performed by cleaning the surface of the substrate with ethanol and deionized water, and then drying the substrate at a drying temperature of 60 ℃ for a drying time of 1 hour.

Alternatively, in the step S31, the substrate may be polyisoprene rubber, styrene-butadiene rubber, nitrile rubber, ethylene propylene diene rubber, polyurethane, latex or silica gel.

Optionally, in the step S32, the self-repairing flocking adhesive is coated with a thickness of 0.1-0.3mm.

Optionally, in the step S32, the self-repairing flocking adhesive is coated with a thickness of 0.2mm.

Optionally, in the step S32, the self-repairing flocking adhesive is left to stand for 10 minutes after the end of the coating to ensure uniform distribution.

Optionally, in the step S33, the length of the fiber material is 1mm.

Optionally, in step S33, the fiber material is nylon, viscose, acrylic, polyester or leather velvet.

Optionally, in step S34, the temperature of the heat curing process is 80 ℃, and the time of the heat curing process is 2 hours.

In a fourth aspect, the present application provides a self-repairing flocking material, which adopts the following technical scheme:

the self-repairing flocking material is prepared by the preparation method.

Optionally, the self-repairing flocked material comprises

A base layer;

the adhesive layer is formed on the surface of the substrate layer by the self-repairing flocking adhesive;

And the flocking layer is adhered to the substrate layer through the adhesive layer by the fiber material.

The material not only has the advantages of the traditional flocking material, such as beautiful appearance, wear resistance, softness and the like, but also has a unique self-repairing function. The self-healing microcapsules within the material are capable of rapidly responding and releasing the self-healing agent to repair cracks and defects by chemical reaction when cracks or damage occur on the surface of the material, thereby restoring the integrity and performance of the material. The self-repairing function obviously improves the durability and the service life of the flocking material, reduces the maintenance cost and widens the application field of the flocking material.

In summary, the present application includes at least one of the following beneficial effects:

1. The self-repairing agent is prepared into a core-shell structure with the self-repairing agent encapsulated inside and the polyurethane shell wrapped outside, the shell can be kept intact in the normal use process of the material, the internal self-repairing agent is protected, when the flocking layer or the adhesive layer is damaged by external force (such as scratch, abrasion, impact and the like) to cause the material damage, the microcapsule shell distributed in the adhesive can be broken, the internal self-repairing agent can be released to the damaged area, the released self-repairing agent can fill the damaged area, and after reacting with air, moisture or other components in the adhesive in the external environment, the new material is solidified to form a new material, and the new material can effectively fill the crack or damage, so that the integrity and the functionality of the material are restored.

2. According to the self-repairing flocking adhesive, the self-repairing microcapsule is introduced into the self-repairing flocking adhesive, so that the flocking material with a self-repairing function is successfully prepared, and when the self-repairing flocking layer is mechanically damaged, the damage can be effectively repaired by releasing and solidifying the self-repairing agent, so that the durability and the service life of the flocking layer are improved.

Drawings

FIG. 1 is a microscopic magnification of the self-healing microcapsules prepared in example 1 of the present application;

FIG. 2 is an enlarged schematic view of self-healing microcapsules prepared in example 4 of the present application uniformly distributed in the binder matrix;

FIG. 3 is a schematic structural view of a self-repairing flocking material prepared in example 9 of the present application;

FIG. 4 is a schematic diagram of the action of the self-healing microcapsules;

FIG. 5a is a graph of the topography of the material immediately after scoring;

fig. 5b is a graph of the surface topography of the material 24 hours after scoring the scratch.

Detailed Description

The application will be further illustrated with reference to specific examples.

Example 1

The embodiment 1 provides a self-repairing microcapsule, which is prepared from the following raw materials of 20g of shell material monomer toluene diisocyanate, 55g of self-repairing agent and 25g of emulsifier Tween 80, wherein the self-repairing agent is prepared by compounding 25g of toluene diisocyanate and 30g of polyethylene glycol adipate, and the specific preparation method comprises the following steps:

step S11, mixing a self-repairing agent in a water phase by using an emulsifier Tween 80 at 25 ℃ to form a water-in-oil emulsion, wherein the stirring speed is 1000rpm, and the emulsifying time is 30 minutes;

Step S12, dropwise adding shell material monomers into the water-in-oil emulsion at 35 ℃, and performing emulsion polymerization reaction for 2 hours under stirring, wherein the stirring speed is 800rpm;

And S13, obtaining the self-repairing microcapsule through filtering, washing and drying, wherein the drying temperature is 40 ℃ and the drying time is 12 hours.

FIG. 1 is a microscopic magnification of the self-healing microcapsule prepared in example 1 of the present application. Referring to fig. 1, the self-repairing microcapsule has a clear surface profile, and the microcapsule has a uniform spherical or spheroid-like structure, and the size distribution is between 50 and 110 microns. The microcapsule surface is smooth, and no obvious surface defect or crack exists, which indicates that the adopted emulsion polymerization technology effectively controls the shape and structure of the microcapsule. In addition, the microcapsules have uniform wall thickness and exhibit good structural integrity, which helps to stably release the internal self-healing agent when the material is damaged by stress, ensuring the effectiveness of its healing function.

Examples 2 to 3

Examples 2-3 are essentially identical to example 1, except that the proportions of the components in the self-healing microcapsules are different, see in particular Table 1.

Table 1 (Unit: g)

Example 4

Example 4 provides a self-repairing flocking adhesive, which is prepared from 75g of polyurethane prepolymer, 10g of plasticizer Dioctylphthalate (DOP), 5g of stabilizer dibutyl tin Dilaurate (DBTL), 3g of catalyst Diisopropylamine (DIPA), 7g of reinforcing agent and 10g of self-repairing microcapsule prepared in example 1, wherein the specific preparation method comprises the following steps:

Step S21, uniformly stirring the polyoxypropylene ether triol and the toluene diisocyanate according to a molar ratio of 1.5:1, and then heating to 90 ℃, and keeping for 2 hours to form a polyurethane prepolymer with a hydroxyl terminal;

step S22, taking 75g of polyurethane prepolymer from the product of the step S21, cooling to room temperature, adding a plasticizer, a stabilizer and a catalyst, and stirring for 30 minutes at a stirring speed of 2000rpm by adopting a high-speed stirrer so as to ensure that all substances are uniformly stirred;

Step S23, gradually adding PLA nano-fibers into the product obtained in the step S22, ensuring that the PLA nano-fibers are fully and uniformly stirred after each addition, and stirring for 0.5 hour at 25 ℃ by adopting a high-speed stirrer at a stirring speed of 2000rpm so as to ensure that the reinforcing agent is uniformly distributed in the adhesive matrix;

And step S24, maintaining the adhesive matrix at a low-speed stirring condition of 300rpm at a temperature of 25 ℃, stirring for about 15 to 30 minutes, and slowly and uniformly adding the self-repairing microcapsules into the adhesive matrix.

After the preparation is completed, a small amount of sample is taken to observe the distribution of the self-repairing microcapsules. FIG. 2 is an enlarged schematic view of self-healing microcapsules prepared in example 4 of the present application uniformly distributed in an adhesive matrix. Referring to fig. 2, it can be seen that the self-healing microcapsules are uniformly distributed in the adhesive matrix and are not broken.

Examples 5 to 6

Examples 5-6 are essentially identical to example 4, except that the self-healing microcapsules employed in examples 5 and 6 are derived from the self-healing microcapsules prepared in examples 2 and 3, respectively.

Example 7

Example 7 is substantially the same as example 4 except that the self-healing microcapsules used in example 7 are used in an amount of 15g.

Example 8

Example 8 is essentially the same as example 4 except that the self-healing microcapsules used in example 8 are used in an amount of 20g.

Example 9

Embodiment 9 provides a self-repairing flocked material, which is prepared by the following method:

step S31, selecting polyisoprene rubber as a substrate and performing pretreatment, specifically, cleaning the surface of the substrate by using ethanol and deionized water, and then performing drying treatment, wherein the drying temperature is 60 ℃ and the drying time is1 hour;

step S32, uniformly coating the self-repairing flocking adhesive prepared in the embodiment 4 on the surface of a substrate by using a scraper, wherein the coating thickness is 0.2mm, and standing for 10 minutes;

step S33, uniformly implanting a polyester fiber material with the length of 1mm into the self-repairing flocking adhesive by adopting electrostatic flocking equipment under the condition of 50kV of electric field intensity;

and step S34, performing heat curing treatment on the flocked product at the temperature of 80 ℃ for 2 hours to obtain the product.

Fig. 3 is a schematic structural diagram of a self-repairing flocking material prepared in example 9 of the present application. Referring to fig. 3, the self-repairing flocking adhesive is located between the substrate and the fibrous material for tightly adhering the fibrous material to the substrate, self-repairing microcapsules having a size in the range of 50-110 micrometers are uniformly distributed in the self-repairing flocking adhesive. FIG. 4 is a schematic diagram of the action of self-healing microcapsules. Referring to fig. 4, when the flock layer or the adhesive layer is damaged by external force (e.g., scratch, abrasion, impact, etc.), the microcapsule shell distributed in the adhesive may be broken, the internal self-repairing agent may be released to the damaged area, and the released self-repairing agent may fill and repair the damaged area.

Examples 10 to 13

Examples 10-13 are substantially identical to example 9, except that the self-repairing flocking adhesive employed in examples 10-13 is derived from examples 5-8, respectively.

Comparative example 1

Comparative example 1 is substantially identical to example 9, except that the flocking adhesive used in comparative example 1 differs from the flocking adhesive used in example 9 in that the flocking adhesive of comparative example 1 does not contain self-repairing microcapsules and is prepared from 75g of polyurethane prepolymer, 10g of dioctyl phthalate (DOP) as a plasticizer, 5g of dibutyltin Dilaurate (DBTL) as a stabilizer, 3g of Diisopropylamine (DIPA) as a catalyst and 7g of reinforcing agent, and the preparation method is as follows:

step S23, gradually adding PLA nanofibers into the product obtained in step S22, ensuring that the fibers are fully and uniformly stirred after each addition, and stirring the fibers for 0.5 hour at 25 ℃ by adopting a high-speed stirrer at a stirring speed of 2000rpm to ensure that the reinforcing agent is uniformly distributed in the adhesive matrix, thus obtaining the flocking adhesive.

Performance detection

1. Scratch test:

The self-repairing flocking material prepared in example 9 was sampled for scratch test to evaluate its mechanical damage repairing performance. And (3) marking scratches with the depth of 0.1mm on the surface of the sample flocking layer by adopting a scratch instrument, and observing the self-repairing effect of the damaged parts. After the scratch, the substrate is placed for 24 hours, and the surface morphology change of the flocking layer before and after the scratch is observed under a microscope.

Fig. 5a is a graph of the surface topography of the material immediately after scribing the scratch, and fig. 5b is a graph of the surface topography of the material after scribing the scratch for 24 hours. As can be seen from fig. 5a and 5b, after 24 hours of scoring the scratches, the scratches on the surface of the material have substantially disappeared after repair by the self-repairing microcapsules.

2. Abrasion test:

The self-repairing flocking materials prepared in examples 9 to 13 and comparative example 1 were respectively subjected to abrasion test for evaluating abrasion resistance. According to the American Standard ASTM D3884-2009, 5 samples of each of the self-repairing flocked materials prepared in examples 9-13 and comparative example 1 were taken, the sample size was 150mm by 150mm, the load was 500g, the grinding wheel model was CS-10, the abrasion was 1000 times, and the surface roughness and the average weight change before and after abrasion of the sample were recorded, and the specific results are shown in Table 2.

Table 2 abrasion test results

As can be seen from the results of table 2, the self-repairing flock materials of examples 9 to 13 significantly reduced the surface roughness at the damage after mechanical damage by releasing the self-repairing agent through the rupture of the self-repairing microcapsules.

In the abrasion test, the test piece loses part of its mass due to abrasion of the material after abrasion. This reduction in mass (i.e., weight change) directly reflects the wear resistance of the material. The smaller the weight change, the less mass the material loses during wear, indicating that the material has better wear resistance. It can also be seen from Table 2 that the wear resistance of the materials of examples 9-13 is significantly better than that of comparative example 1. The reason for this is that the self-repairing flocking adhesive of the present application has several self-repairing microcapsules, which are broken and release self-repairing agents when the material is damaged during abrasion, and the self-repairing agents fill and repair damaged areas rapidly. This real-time repair mechanism effectively reduces the loss of material during friction and therefore the weight change after wear is less.

The above embodiments are not intended to limit the scope of the application, so that the equivalent changes of the structure, shape and principle of the application are covered by the scope of the application.

Claims

1. A self-repairing microcapsule for self-repairing flocking material, characterized in that it comprises the following raw materials in parts by weight: 15-25 parts of shell material monomer, 50-70 parts of self-repairing agent, and 25-40 parts of emulsifier;

The self-healing agent is a mixture of isocyanate and polyethylene adipate in a mass ratio of 4-5:5-6, and the shell material monomer is isocyanate.

2. The self-repairing microcapsule for self-repairing flocking material according to claim 1 is characterized in that it is prepared by the following preparation method:

Step S11: using the emulsifier to mix the self-repairing agent in the water phase to form a water-in-oil emulsion;

Step S12: adding the shell material monomer dropwise into the water-in-oil emulsion, and performing emulsion polymerization reaction under stirring;

Step S13: obtaining self-repairing microcapsules by filtering, washing and drying.

3. A self-repairing flocking adhesive, characterized in that it comprises a uniformly mixed adhesive matrix and the self-repairing microcapsules according to claim 2, wherein the amount of the self-repairing microcapsules is 10%-20% of the mass of the adhesive matrix.

4. The self-repairing flocking adhesive according to claim 3 is characterized in that the adhesive matrix comprises the following raw materials in parts by weight: 70-85 parts of polyurethane prepolymer, 5-15 parts of plasticizer, 3-6 parts of stabilizer, and 2-5 parts of catalyst.

5. The self-repairing flocking adhesive according to claim 4, characterized in that the adhesive matrix also includes 5-10 parts of a reinforcing agent.

6 . The self-repairing flocking adhesive according to claim 5 , wherein the reinforcing agent is CNTs, nanocellulose or PLA nanofiber.

7. The self-repairing flocking adhesive according to claim 5, characterized in that the self-repairing flocking adhesive is prepared by the following preparation method:

Step S21: the polyether polyol and diisocyanate are stirred evenly and then heated to 80-90° C. and maintained for 2 hours to form a polyurethane prepolymer with a hydroxyl terminal;

Step S22: After cooling the polyurethane prepolymer to room temperature, add a plasticizer, a stabilizer and a catalyst, and stir evenly;

Step S23: gradually adding the reinforcing agent to the product obtained in step S22, and stirring evenly to obtain the adhesive matrix;

Step S24: while the adhesive matrix is stirred at a low speed, the self-repairing microcapsules are slowly and evenly added into the adhesive matrix to obtain the adhesive matrix.

8. The self-repairing flocking adhesive according to claim 7, characterized in that in the step S24, the stirring speed of the adhesive matrix is 200-500 rpm.

9. A method for preparing a self-repairing flocking material, characterized in that it comprises the following steps:

Step S31: substrate pretreatment;

Step S32: uniformly coating the self-repairing flocking adhesive according to any one of claims 3 to 8 on the surface of the substrate and allowing to stand;

Step S33: uniformly implanting the fiber material into the self-repairing flocking adhesive under the condition of an electric field strength of 50 kV;

Step S34: subjecting the flocked product to thermal curing treatment to obtain the product.

10. A self-repairing flocking material, characterized in that it is prepared by the preparation method according to claim 9.