Polyurethane composite material adhesive film for bonding lightweight down jacket and preparation method of polyurethane composite material adhesive film

Abstract

The invention relates to a polyurethane composite material adhesive film for bonding light-weight down jackets and a preparation method of the polyurethane composite material adhesive film, and belongs to the technical field of polyurethane materials. The polyurethane composite material adhesive film comprises the following raw material components: polymer diol, small molecule diol, dioxime, polyisocyanate, a solvent, an antioxidant, a catalyst, monooxime and tackifying resin. The adhesive film has a special oxime-ammonia ester bond structure, part of macromolecular chains are depolymerized at high temperature, the molecular weight is reduced, the adhesive film has good wettability on smooth fabrics such as water repellent fabrics, active isocyanate groups are released to further react with moisture in the fabrics to form a cross-linked network structure, and the adhesive film is matched with tackifying resin, so that the adhesive film has good adhesion to the fabrics. The adhesive has the advantages of being high in bonding strength, good in washing resistance and dry cleaning resistance, convenient to produce and operate and the like for high-density and low-surface-energy water-repellent fabric, and is particularly suitable for manufacturing light-weight seamless down jackets.

Description

Technical Field

[0001] The invention belongs to the technical field of polyurethane materials, and particularly relates to a polyurethane composite material adhesive film for bonding lightweight down jackets and a preparation method thereof. Background Art

[0002] As people's quality of life gradually improves, their aesthetic concept of clothing appearance becomes stronger and stronger, especially in winter, people's demand for lightweight down jackets is getting higher and higher. There are several advantages. First, lightweight down jackets can better shape the external image of personal clothing and highlight the beauty of the body; second, lightweight down jackets are thin, soft, and highly retractable, which are particularly easy to carry; third, except for extremely cold areas, lightweight down jackets can meet the warmth needs of consumers in most regions, and the audience is very wide. However, lightweight down jackets are generally made of high-density, low-surface-energy smooth fabrics with water-repellent treatment. The products on the market are generally made by sewing technology, which is easy to cause the defect of drilling down. There is still no large-scale product sales using the non-sewing technology. The main reason is that the seamless process using hot-melt film or hot-melt adhesive bonding still has defects such as low bonding strength, poor washing resistance and easy falling off, which greatly limits the promotion and sales of lightweight seamless down jackets.

[0003] In the existing preparation technology, the patent with the announcement number CN11476670B reported a method of using a protective strip and a spatial seam structure design to solve the problem of down penetration in down jackets. With the accumulation of the number of washing times, loose gaps are easily formed at the seam position, and down is easily lost. In addition, the pre-process of preparing down jackets is complicated, the efficiency is low, and the designability of the fabric channel is not rich enough. The patent with the announcement number CN108048021A reported a composite structural adhesive film composed of an X-shaped fabric and a polyurethane adhesive composited on the upper and lower surfaces of the X-shaped double-layer fabric for bonding seamless down jackets, which can solve the problem of down leakage and obtain high bonding strength between fabric layers. However, the structural design of the composite structural adhesive film makes its production process complicated, and it cannot compare with the convenience of operation brought by direct hot pressing of fabrics with a single-layer adhesive film; in addition, since the thickness of the fabric layer and the adhesive layer is relatively thick, and there is an intermediate weave in the X-shaped double-layer fabric, the bonding of seamless down jackets made of lightweight and smooth fabrics is easy to cause obvious indentation marks on the appearance of the clothing.

[0004] Therefore, it is necessary to study a polyurethane composite film with high bonding strength, high water resistance and easy production operation for high-density, low-surface-energy lightweight smooth fabrics that have been treated with water repellent, which is suitable for the production of seamless down jackets. Summary of the invention

[0005] The purpose of the present invention is to provide a polyurethane composite material adhesive film for bonding lightweight seamless down jackets and a preparation method thereof.

[0006] The objective of the present invention is achieved through the following technical solutions:

[0007] A polyurethane composite adhesive film for bonding lightweight down jackets, comprising the following raw material components by weight:

[0008] 100 parts of polymer diol

[0009] Small molecule diol 0-10 parts

[0010] 2-15 parts of dioxime

[0011] Polyisocyanate 25-60 parts

[0012] Solvent 120-200 parts

[0013] Antioxidant 0.3-0.6 parts

[0014] Catalyst 0.01-0.1 parts

[0015] 1-5 parts of monooxime

[0016] 10-50 parts of tackifying resin

[0017] Preferably, the polymer diol is one or more of polytetramethylene glycol, polycaprolactone diol, polyethylene adipate diol, polybutylene adipate diol, polyhexylene adipate diol, polybutylene adipate hexylene glycol ester diol, polycarbonate diol, polybutylene phthalate diol, polyhexylene phthalate diol, and polyneopentyl phthalate diol; and the number average molecular weight of the polymer diol is 500-5000 g / mol.

[0018] Preferably, the small molecule diol is one or more of ethylene glycol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,3-propylene glycol, neopentyl glycol, 1,4-cyclohexanediol, and 2-methyl-1,3-propanediol.

[0019] Preferably, the dioxime is one or more of 1,4-benzoquinone dioxime, 1,2-cyclohexanedione dioxime, dimethylglyoxime, acetone aldehyde dioxime, and 2,4-pentanedione dioxime.

[0020] Preferably, the polyisocyanate is one or more of diphenylmethane diisocyanate, toluene diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, cyclohexane dimethylene diisocyanate, and dimethylbiphenyl diisocyanate.

[0021] Preferably, the solvent is one or more of acetone, butanone, N,N-dimethylformamide, N,N-dimethylacetamide, tetrahydrofuran, methyl ethyl ketone, cyclohexanone, toluene, o-xylene, m-xylene, and p-xylene.

[0022] Preferably, the antioxidant is one or more of antioxidant 1010, antioxidant 168, antioxidant 1076, antioxidant BHT, antioxidant 2246, antioxidant 425, antioxidant 2246-S, and antioxidant 330.

[0023] Preferably, the catalyst is one or more of stannous octoate, dibutyltin dilaurate, triethylamine, bismuth isooctanoate, bismuth laurate, bismuth neodecanoate, bismuth cyclohexaneate, and zinc isooctanoate.

[0024] Preferably, the monooxime is one or more of cyclohexanone oxime, methyl ethyl ketone oxime, acetophenone oxime, acetone oxime, dimethyl ketone oxime, diacetyl monooxime and acetaldehyde oxime.

[0025] Preferably, the tackifying resin is one or more of rosin resin, rosin resin derivatives, terpene resin derivatives, and alkylphenol-formaldehyde resins.

[0026] The present invention also provides a method for preparing a polyurethane composite material adhesive film for bonding lightweight down jackets, comprising the following preparation steps:

[0027] (1) Adding solvent, polymer diol, small molecule diol, dioxime, antioxidant and catalyst into a reaction kettle under nitrogen atmosphere, and then stirring and heating to 60° C. until the solid raw materials are completely dissolved;

[0028] (2) adding a polyisocyanate compound, and then continuing to raise the temperature to the target temperature and keeping the temperature for a certain period of time;

[0029] (3) After the reaction is completed, add monooxime to cap the residual isocyanate groups, keep warm and stir for 1 hour, then add tackifying resin, and continue to keep warm and stir for 3 hours;

[0030] (4) finally adding a solvent to dilute to the target solid content, and cooling and stirring to 25° C. to obtain a polyurethane composite material solution or slurry;

[0031] (5) The polyurethane composite material solution or slurry obtained in step (4) is coated on paper by a coating process, the coating thickness is controlled, and then the paper is placed in an oven for drying and rolling to prepare the polyurethane composite material film.

[0032] Preferably, the polyisocyanate in step (2) is added once or multiple times with an interval of 5-30 minutes.

[0033] Preferably, the target temperature in step (2) is 60-100°C.

[0034] Preferably, the insulation reaction time in step (2) is 1-5h.

[0035] Preferably, the target solid content in step (4) is 30%-70% by weight.

[0036] Preferably, in step (5), a coating process is adopted to add the polyurethane composite material solution or slurry into a coating machine, and the solution or slurry is coated on the glassine paper by a scraper of a coating head.

[0037] Preferably, the oven drying temperature in step (5) is 60-130°C.

[0038] Preferably, the thickness of the polyurethane composite film prepared in step (5) is 0.05-0.15 mm.

[0039] The present invention also provides an application of a polyurethane composite adhesive film for bonding lightweight down jackets in the manufacture of lightweight seamless down jackets.

[0040] Preferably, the polyurethane composite adhesive film for bonding lightweight down jackets can be used for bonding lightweight seamless down jackets.

[0041] The thickness of the polyurethane composite film should be moderate. If the film is too thin, the bonding strength to lightweight smooth fabrics will be insufficient, the tear resistance will be poor, and it will easily fall off after repeated washings. If the film is too thick, although the bonding strength to fabrics will be improved, there will be obvious indentations or pits on the lightweight fabrics, which will seriously affect the overall appearance and sales. In addition, when the film is too thick, the softness will be significantly reduced, and the part bonded to the fabric will appear thick, which is inconsistent with the light touch of other parts.

[0042] The beneficial effects of the present invention are:

[0043] The present invention simultaneously introduces dioxime monomers and monooxime monomers into the molecular chain structure of the polyurethane material during the polyurethane synthesis process to form a special oxime urethane bond structure. When the material is heated at high temperature, the oxime urethane bond has a thermally reversible unblocking function, which, on the one hand, causes the partial macromolecular chain structure of the polyurethane to break, forming a short molecular chain structure with a lower molecular weight, which has good wettability for high-density, low-surface-energy, lightweight and smooth fabrics that have been treated with water repellent. On the other hand, part of the active isocyanate groups released from the structure further react with moisture in the fabric to form a cross-linked network structure similar to the properties of PUR, which has a strong wetting reaction bonding strength to the lightweight and smooth fabric. At the same time, a tackifying resin is added to the synthesized polyurethane solution to further enhance the bonding effect to the fabric substrate, and the active isocyanate groups released by the unblocking of the oxime urethane bonds during hot pressing form a synergistic bonding effect on the fabric surface at the physical and chemical levels. This has high bonding strength for high-density, low surface energy water-repellent fabrics. The pressed fabrics have the advantages of high resistance to water washing and dry cleaning, and convenient production operation, and are particularly suitable for the manufacture of lightweight seamless down jackets. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1 It is a schematic diagram of the polyurethane composite material adhesive film for bonding lightweight down jackets of the present invention.

[0046] Figure 2 The present invention is a schematic diagram of using the polyurethane composite material adhesive film for bonding lightweight down jackets to bond lightweight seamless down jacket fabrics.

[0047] The polyurethane composite adhesive film for bonding lightweight down jackets of the present invention has a finished film Figure 1 As shown, it is composed of PET matte release paper 1, polyurethane composite film 2, and PET matte release paper 1. After hot pressing, it is used for bonding lightweight seamless down jacket fabrics. Figure 2 As shown, from outside to inside, it is composed of a surface cloth 3, a polyurethane composite material film 2, and a bladder cloth 4. DETAILED DESCRIPTION

[0048] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of 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.

[0049] Example 1

[0050] A polyurethane composite adhesive film for bonding lightweight down jackets and a preparation method thereof, comprising the following steps:

[0051] (1) In a reaction kettle, 35 parts of toluene and 70 parts of N,N-dimethylacetamide, 100 parts of poly(hexanediol adipate) with a number average molecular weight of 1000 g / mol, 1.8 parts of 1,4-butanediol, 3.5 parts of dimethylglyoxime dioxime, 0.35 parts of antioxidant 1010 and 0.05 parts of catalyst bismuth laurate were added under a nitrogen atmosphere, and then the mixture was stirred and heated to 60° C. until the solid raw materials were completely dissolved;

[0052] (2) adding dicyclohexylmethane diisocyanate in two portions, 35 portions in the first portion, reacting for 10 minutes before adding the remaining 15 portions, and continuing to raise the temperature to 85° C. and keep the temperature for 2.5 hours;

[0053] (3) After the reaction is completed, 2.5 parts of methyl ethyl ketone oxime is added to cap the residual isocyanate groups, the mixture is stirred at room temperature for 1 hour, and then 10 parts of rosin resin derivative is added, and the mixture is stirred at room temperature for 3 hours;

[0054] (4) finally adding 12 parts of toluene and 24 parts of N,N-dimethylacetamide to dilute to a solid content of 54.40%, and stirring and cooling to 25° C. to obtain a polyurethane composite material solution or slurry;

[0055] (5) The polyurethane composite material solution or slurry obtained in step (4) is coated on paper by a coating process, and the coating thickness is controlled to be 0.07 mm. The paper is then placed in an oven at 90° C. for drying and rolling to obtain a polyurethane composite material film.

[0056] Example 2

[0057] This embodiment is the same as embodiment 1 except that 70 parts of N,N-dimethylacetamide in step (1) is replaced with 70 parts of butanone.

[0058] Example 3

[0059] This embodiment is the same as Embodiment 1 except that 100 parts of poly(hexylene adipate glycol) diol with a molecular weight of 1000 in step (1) is replaced with 100 parts of poly(hexylene adipate glycol) diol with a number average molecular weight of 2000 g / mol.

[0060] Example 4

[0061] This embodiment is the same as Example 1 except that 100 parts of poly(hexamethylene adipate) diol with a molecular weight of 1000 in step (1) is replaced with 100 parts of poly(tetramethylenetetrahydrofuran) ether diol with a number average molecular weight of 1000 g / mol.

[0062] Example 5

[0063] This example is the same as Example 1 except that 1.8 parts of 1,4-butanediol in step (1) is replaced by 1.8 parts of 1,6-hexanediol.

[0064] Example 6

[0065] This embodiment is the same as Embodiment 1 except that 1.8 parts of 1,4-butanediol and 3.5 parts of dimethylglyoxime dioxime in step (1) are replaced by 0.5 parts of 1,4-butanediol and 4.8 parts of dimethylglyoxime dioxime.

[0066] Example 7

[0067] This embodiment is the same as embodiment 1 except that 3.5 parts of dimethylglyoxime dioxime in step (1) is replaced by 3.5 parts of 1,4-benzoquinone dioxime.

[0068] Example 8

[0069] This embodiment is the same as Embodiment 1 except that the amount of antioxidant in step (1) is changed from 10100.35 parts to 10760.35 parts.

[0070] Example 9

[0071] This embodiment is the same as Example 1 except that 0.05 parts of bismuth laurate in step (1) is replaced by 0.05 parts of zinc isooctanoate.

[0072] Example 10

[0073] This embodiment is the same as the embodiment 1 except that the dicyclohexylmethane diisocyanate compound is added in two portions in step (2) instead of adding 50 portions all at once.

[0074] Embodiment 11

[0075] This embodiment is the same as the embodiment 1 except that the dicyclohexylmethane diisocyanate compound in step (2) is changed to diphenylmethane diisocyanate.

[0076] Example 12

[0077] This embodiment is the same as Example 1 except that the dicyclohexylmethane diisocyanate compound is added in two times in step (2), with 35 parts added for the first time and the remaining 15 parts added after 10 minutes of reaction, and the diphenylmethane diisocyanate compound is added in three times, with 30 parts added for the first time, 15 parts added for the second time after 10 minutes of reaction, and 5 parts added for the third time after 10 minutes of reaction.

[0078] Embodiment 13

[0079] This embodiment is the same as the embodiment 1 except that the step (2) of continuing to heat up to 85°C is changed to continuing to heat up to 100°C.

[0080] Embodiment 14

[0081] This embodiment is the same as embodiment 1 except that the insulation reaction time in step (2) is changed from 2.5 hours to 4 hours.

[0082] Embodiment 15

[0083] This embodiment is the same as embodiment 1 except that 2.5 parts of methyl ethyl ketone oxime in step (3) is replaced by 2.5 parts of acetone oxime.

[0084] Example 16

[0085] This embodiment is the same as the embodiment 1 except that the 10 parts of rosin resin derivative in step (3) is replaced with 10 parts of terpene resin derivative.

[0086] Embodiment 17

[0087] This embodiment is the same as Embodiment 1 except that the coating thickness in step (5) is changed from 0.07 mm to 0.1 mm.

[0088] Embodiment 18

[0089] This embodiment is the same as embodiment 1 except that the 90°C oven in step (5) is changed to a 120°C oven.

[0090] Comparative Example 1

[0091] This comparative example is the same as Example 1 except that 1.8 parts of 1,4-butanediol in step (1) is removed and only 5.3 parts of dimethylglyoxime dioxime are added.

[0092] Comparative Example 2

[0093] This comparative example is the same as Example 1 except that 3.8 parts of dimethylglyoxime dioxime in step (1) is removed and only 5.3 parts of 1,4-butanediol is added.

[0094] Comparative Example 3

[0095] This comparative example is the same as Example 1 except that 0.05 parts of the catalyst bismuth laurate in step (1) is removed.

[0096] Comparative Example 4

[0097] This comparative example is the same as Example 1 except that 2.5 parts of methyl ethyl ketone oxime in step (3) is removed.

[0098] Comparative Example 5

[0099] This comparative example is the same as Example 1 except that 10 parts of the rosin resin derivative in step (3) are removed.

[0100] Performance Testing

[0101] According to the following test method, the dry cleaning and water washing adhesion properties of the polyurethane composite adhesive films prepared in Examples 1-18 and Comparative Examples 1-5 and the commercially available special hot melt adhesive films were tested using commercially available common water-repellent treated high-density, low surface energy, lightweight and smooth down fabrics. The test results are listed in Table 1.

[0102] (1) Washability test: According to JIS L0217103 method, wash in a washing machine at 40°C for 10 times, each time for 20 minutes.

[0103] (2) Dry cleaning resistance test: In accordance with GB / T 19981.2-2005 Professional care, dry cleaning and wet cleaning of textiles, fabrics and garments Part 2, performance test procedure for dry cleaning and ironing using tetrachloroethylene, dry cleaning 15 times.

[0104] (3) Film peeling (tearing) strength: The polyurethane composite film prepared in Examples 1-18 and Comparative Examples 1-5 and the commercially available special hot melt adhesive film were cut into tape strips of 5 cm (length) * 0.7 cm (width) and placed between two layers of lightweight smooth fabrics. The product of the above structure was hot-pressed for 35 seconds at 140°C and 0.4 MPa using a flat press, left at room temperature for 24 hours, and then cut into 2.5 cm wide fabric strips to test their peeling (tearing) strength.

[0105] Table 1 Comparative test performance of polyurethane composite adhesive films prepared in Examples 1-18 and Comparative Examples 1-5 and commercially available special hot melt adhesive films

[0106]

[0107]

[0108] From the test data in Table 1 above, it can be concluded that the polyurethane composite material films prepared by Examples 1-18 of the present invention, the polyurethane composite material films prepared by Comparative Examples 1-5, and the commercially available special hot-melt films are used for the bonding performance test of high-density, low surface energy lightweight smooth down fabrics that have been treated with water repellent. The comparison shows that the polyurethane composite material films have good resistance to dry cleaning and water washing, and the fabric bonding performance before and after washing is excellent. The fabric morphological integrity and fabric glue pressing appearance after filling and washing are both good, and are particularly suitable for the manufacture of lightweight seamless down jackets.

[0109] 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 it. 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 purpose and scope of the technical solution of the present invention, which should be covered by the scope of the claims of the present invention.

Claims

1. A polyurethane composite adhesive film for bonding lightweight down jackets, characterized in that: The polyurethane composite material adhesive film for bonding lightweight down jackets comprises the following raw material components in parts by mass: 100 parts of polymer diol; 0-10 parts of small molecule diol; 2-15 parts of dioxime; Polyisocyanate 25-60 parts; 120-200 parts of solvent; Antioxidant 0.3-0.6 parts; Catalyst 0.01-0.1 part; 1-5 parts of monooxime; 10-50 parts of tackifying resin.

2. The polyurethane composite material adhesive film for bonding lightweight down jackets according to claim 1, characterized in that: The polymer diol is one or more of polytetramethylene glycol, polycaprolactone diol, polyethylene adipate diol, polybutylene adipate diol, polyhexylene adipate diol, polybutylene adipate hexylene glycol ester diol, polycarbonate diol, polybutylene phthalate diol, polyhexylene phthalate diol, and polyneopentyl phthalate diol; the number average molecular weight of the polymer diol is 500-5000 g / mol; The small molecule diol is one or more of ethylene glycol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,3-propylene glycol, neopentyl glycol, 1,4-cyclohexanediol, and 2-methyl-1,3-propylene glycol; The dioxime is one or more of 1,4-benzoquinone dioxime, 1,2-cyclohexanedione dioxime, dimethylglyoxime, acetone aldehyde dioxime, and 2,4-pentanedione dioxime; The polyisocyanate is one or more of diphenylmethane diisocyanate, toluene diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, cyclohexane dimethylene diisocyanate, and dimethylbiphenyl diisocyanate; The solvent is one or more of acetone, butanone, N,N-dimethylformamide, N,N-dimethylacetamide, tetrahydrofuran, methyl ethyl ketone, cyclohexanone, toluene, o-xylene, m-xylene, and p-xylene; The antioxidant is one or more of antioxidant 1010, antioxidant 168, antioxidant 1076, antioxidant BHT, antioxidant 2246, antioxidant 425, antioxidant 2246-S, and antioxidant 330; The catalyst is one or more of stannous octoate, dibutyltin dilaurate, triethylamine, bismuth isooctanoate, bismuth laurate, bismuth neodecanoate, bismuth cyclohexaneate, and zinc isooctanoate; The monooxime is one or more of cyclohexanone oxime, methyl ethyl ketone oxime, acetophenone oxime, acetone oxime, dimethyl ketone oxime, diacetyl monooxime and acetaldehyde oxime; The tackifying resin is one or more of rosin resin, rosin resin derivative, terpene resin derivative and alkylphenol-formaldehyde resin.

3. A method for preparing a polyurethane composite adhesive film for bonding lightweight down jackets as described in any one of claims 1 to 2, characterized in that: The steps include: (1) Adding solvent, polymer diol, small molecule diol, dioxime, antioxidant and catalyst into a reaction kettle under nitrogen atmosphere, and then stirring and heating to 60° C. until the solid raw materials are completely dissolved; (2) adding polyisocyanate, and then continuing to raise the temperature to the target temperature and keeping the temperature for a certain reaction time; (3) After the reaction is completed, add monooxime to cap the residual isocyanate groups, keep warm and stir for 1 hour, then add tackifying resin, and continue to keep warm and stir for 3 hours; (4) finally adding a solvent to dilute to the target solid content, and cooling and stirring to 25° C. to obtain a polyurethane composite material solution or slurry; (5) The polyurethane composite material solution or slurry obtained in step (4) is coated on paper by a coating process, the coating thickness is controlled, and then the paper is placed in an oven for drying and rolling to prepare the polyurethane composite material film.

4. The polyurethane composite material adhesive film for bonding lightweight down jackets and the preparation method thereof according to claim 3, characterized in that: In step (2), the polyisocyanate is added once or multiple times at intervals of 5-30 minutes.

5. The polyurethane composite material adhesive film for bonding lightweight down jackets and the preparation method thereof according to claim 3, characterized in that: In step (2), the target temperature is 60-100° C. and the insulation reaction time is 1-5 h.

6. The polyurethane composite material adhesive film for bonding lightweight down jackets and the preparation method thereof according to claim 3, characterized in that: In step (4), the target solid content is 30%-70% by weight.

7. The polyurethane composite material adhesive film for bonding lightweight down jackets and the preparation method thereof according to claim 3, characterized in that: In step (5), the coating process is to add the polyurethane composite material solution or slurry into a coating machine and coat it on glassine paper with a scraper of a coating head.

8. The polyurethane composite material adhesive film for bonding lightweight down jackets and the preparation method thereof according to claim 3, characterized in that: In step (5), the drying temperature of the oven is 60-130° C., and the thickness of the polyurethane composite film is 0.05-0.15 mm.

9. Use of the polyurethane composite material adhesive film for bonding lightweight down jackets as described in any one of claims 1 to 2 in the manufacture of lightweight seamless down jackets.

10. The use according to claim 9, characterized in that: The polyurethane composite adhesive film for bonding lightweight down jackets can be used for bonding lightweight seamless down jackets.

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