Two-liquid type oily polyurethane glue, airbag fabric and application of two-liquid type oily polyurethane glue and airbag fabric

Abstract

The invention provides two-liquid type oily polyurethane glue, a safety airbag fabric and application of the two-liquid type oily polyurethane glue and the safety airbag fabric. The two-liquid type oily polyurethane glue comprises the following components in percentage by weight: 50-70% of two-liquid type oily polyurethane, 3-10% of a polyisocyanate modifier, 10-20% of isocyanate-terminated polysiloxane, 1-5% of a curing agent and the balance of a solvent. Through cooperative use of the two-liquid type oily polyurethane, the polyisocyanate modified body and the isocyanate-terminated polysiloxane, the peeling strength of the glue on the base cloth can be improved, the pressure maintaining property and strength of the air bag restraint system fabric can be improved, and the air permeability of the air bag restraint system fabric can be reduced.

Description

Technical Field

[0001] This invention belongs to the field of polymer materials technology, and relates to a two-component oil-based polyurethane adhesive and an airbag fabric and their applications. Background Technology

[0002] The main function of automotive airbag materials is to protect the occupants of a vehicle during a collision. Therefore, they are required to have pressure retention, high strength, and low air permeability. Thus, developing airbag materials with good comprehensive performance is a key research focus in this field.

[0003] CN114905771 discloses a method for molding a pressure-retaining airbag composite fabric and the composite fabric. The fabric preparation method includes: S1; weaving the fabric into a double-layer airbag fabric with a cavity, and maintaining the humidity of the production environment at 60-80%; S2; preheating the double-layer airbag fabric, the membrane layer, and the moisture-curing reactive polyurethane hot melt adhesive; S3; subjecting the double-layer airbag fabric to corona treatment; S4; coating the front and back sides of the double-layer airbag fabric with heated moisture-curing reactive polyurethane hot melt adhesive, coating the membrane layer with heated moisture-curing reactive polyurethane hot melt adhesive, and laminating the two together; bonding a first adhesive layer to the outside of the double-layer fabric, allowing the first adhesive layer to partially penetrate into the double-layer fabric, then bonding a second adhesive layer on the first adhesive layer, and finally bonding a membrane layer on the second adhesive layer. Through the multi-layer composite structure, the pressure-retaining effect of the airbag is improved. However, the preparation method disclosed in this patent requires both the base fabric and the TPU film to be coated with moisture-curing reactive polyurethane hot melt adhesive. The curing reaction takes a long time, has high requirements for temperature and humidity, and is extremely inefficient. Furthermore, the fabric has poor permeability and low peel strength. When the hot melt adhesive film is exposed to high temperatures, the fabric may peel off, posing a safety hazard in actual use.

[0004] Therefore, there is an urgent need in this field to further develop airbag materials with good performance. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a two-component oil-based polyurethane adhesive, an airbag fabric, and their applications. The two-component oil-based polyurethane adhesive of the present invention ensures that the airbag fabric possesses good pressure retention, high strength, high peel strength, and low air permeability.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] On one hand, the present invention provides a two-component oil-based polyurethane adhesive, wherein the two-component oil-based polyurethane adhesive comprises the following components by weight percentage:

[0008] Two-component oil-based polyurethane, 50-70%

[0009] Polyisocyanate modifiers 3-10%

[0010] 10-20% isocyanate-terminated polysiloxanes

[0011] Hardener 1-5%

[0012] Solvent balance.

[0013] In this invention, the combined use of two-component oily polyurethane, polyisocyanate modifier, and isocyanate-terminated polysiloxane can improve the peel strength of the adhesive on the base fabric, as well as improve the pressure retention and strength of the airbag fabric and reduce its air permeability.

[0014] In this invention, the content of the two-component oil-based polyurethane in the two-component oil-based polyurethane adhesive is 50-70%, for example, 50%, 52%, 54%, 56%, 58%, 60%, 62%, 64%, or 70%, etc.; the content of the polyisocyanate modifier is 3-10%, for example, 3%, 4%, 5%, 7%, 8%, 9%, or 10%, etc.; the content of the isocyanate-terminated polysiloxane is 10-20%, for example, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, or 20%, etc.; the content of the curing agent is 1-5%, for example, 1%, 1.6%, 2.2%, 2.8%, 3.4%, 4%, 4.6%, or 5%, etc.; and the balance includes solvent.

[0015] Preferably, the polyisocyanate modifier is obtained by reacting a polyisocyanate containing isocyanurate groups with an organic compound having active hydrogen.

[0016] Preferably, the organic compound having active hydrogen is an organic compound having a hydroxyl group, a carboxyl group, an amino group, or a thiol group.

[0017] Preferably, the organic compound having active hydrogen is any one of the following compounds:

[0018]

[0019]

[0020]

[0021] .

[0022] Preferably, the isocyanate-terminated polysiloxane is obtained by reacting a diisocyanate compound with an alcohol-hydroxyl-terminated polysiloxane.

[0023] Preferably, the number average molecular weight of the isocyanate-terminated polysiloxane is 500 to 2000, such as 500, 650, 800, 950, 1100, 1250, 1400, 1550, 1700 or 2000.

[0024] Preferably, the mass fraction of isocyanate groups in the isocyanate-terminated polysiloxane is 2-15%, such as 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, or 15%.

[0025] Preferably, the liquid diisocyanate is selected from at least one of isophorone diisocyanate, 2,4-toluene diisocyanate, hexamethylene diisocyanate, or 4,4'-dicyclohexylmethane diisocyanate.

[0026] Preferably, the curing agent is selected from ethyl acetate.

[0027] Preferably, the solvent is selected from at least one of cyclohexane, cyclohexanone, toluenecyclohexanone, ethyl acetate, or butanone.

[0028] On the other hand, the present invention provides an airbag fabric, the airbag fabric comprising a base fabric and a two-component oil-based polyurethane adhesive layer covering the upper surface or both surfaces of the base fabric, the two-component oil-based polyurethane adhesive layer being obtained from the two-component oil-based polyurethane adhesive as described above.

[0029] Preferably, the base fabric is made of double-layer 210D nylon or polyester.

[0030] On the other hand, the present invention provides a method for preparing the airbag fabric as described above, the method comprising the following steps:

[0031] The airbag fabric is obtained by coating the upper surface or both upper and lower surfaces of the base fabric with the two-component oil-based polyurethane adhesive as described above, followed by oven drying and composite roller pressing.

[0032] Preferably, the amount of coating is 20-30 g / m², such as 20 g / m², 21 g / m², 22 g / m², 23 g / m², 24 g / m², 25 g / m², 26 g / m², 27 g / m², 28 g / m², or 30 g / m².

[0033] Preferably, the temperature of the oven is 170~190℃ (e.g., 170℃, 175℃, 180℃, 185℃ or 190℃, etc.), and the processing time is 15-40min (e.g., 15min, 18min, 21min, 24min, 27min, 30min, 33min, 36min or 40min, etc.).

[0034] Preferably, the pressure during the composite rolling process is 6-10 kg (e.g., 6 kg, 7 kg, 8 kg, 9 kg, or 10 kg).

[0035] Preferably, the temperature of the composite roller pressing is 200~210℃ (e.g., 200℃, 202℃, 205℃, 207℃ or 210℃, etc.).

[0036] In this invention, the coating, oven treatment, and composite rolling are all performed in one step, which greatly improves efficiency.

[0037] On the other hand, the present invention provides an automotive airbag, which is made of the airbag fabric described above.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] The two-component oil-based polyurethane adhesive of the present invention can improve the peel strength of the adhesive on the base fabric (peel strength at 24°C: 71-75 N / 5CM in the warp and 70-73 N / 5CM in the weft; peel strength at 50°C: 70-74 N / 5CM in the warp and 70-73 N / 5CM in the weft; burst pressure at 24°C: 70-73 Kpa; burst pressure at 50°C: 69-74 Kpa), and can also improve the pressure retention and strength of the airbag fabric while reducing its air permeability. Detailed Implementation

[0040] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0041] The two-component oil-based polyurethane used in the following examples is TK025, and the curing agent is P-85.

[0042] The preparation method of the polyisocyanate modified body is as follows:

[0043] In a 1000 ml four-necked glass flask, 936 g of hexamethylene diisocyanate (HDI) and 6 g of 1,3-butanediol were added. After purging with nitrogen, the mixture was stirred and heated to 50 °C. Then, 0.1 g of phenol and 0.04 g of catalyst (a mixture of potassium isobutyrate, dipropylene glycol, and THF in a ratio of 1:4.5:4.5) were added. The reaction was carried out at 110 °C, and samples were taken. When the NCO content reached 40%, 0.004 g of N-cyclohexylamine sulfonic acid and 0.015 g of 2-ethylhexyl phosphate were added, and the reaction was stopped. Then, at 130 °C and 0.04 kPa, thin-film distillation was performed to remove free HDI, yielding isocyanate containing isocyanurate groups.

[0044] After nitrogen purging in a reactor equipped with a stirrer, cooling pipe, nitrogen inlet pipe and thermometer, 990g of isocyanate containing isocyanurate groups prepared above and 10g (10000ppm) of N,N-dimethylethanolamine were added, and the mixture was stirred at 80°C for 2 hours to obtain the polyisocyanate modified body.

[0045] The preparation method of isocyanate-terminated polysiloxanes is as follows:

[0046] In a three-necked flask, 100 parts of alcohol hydroxyl-terminated polysiloxane (Guangzhou Sloco New Material Co., Ltd., 8821F2) were added, followed by 28 parts of hexamethylene diisocyanate. The mixture was heated to 90°C under nitrogen protection and reacted for 2 hours to obtain isocyanate-terminated polysiloxane, wherein the mass fraction of isocyanate groups was 4.4%.

[0047] Example 1

[0048] This embodiment provides a two-component oil-based polyurethane adhesive, comprising the following components by weight percentage: 60% two-component oil-based polyurethane, 5% polyisocyanate modifier, 15% isocyanate-terminated polysiloxane, 2% curing agent, and the remainder solvent.

[0049] Example 2

[0050] This embodiment provides a two-component oil-based polyurethane adhesive, comprising the following components by weight percentage: 55% two-component oil-based polyurethane, 3% polyisocyanate modifier, 20% isocyanate-terminated polysiloxane, 2% curing agent, and the balance solvent.

[0051] Example 3

[0052] This embodiment provides a two-component oil-based polyurethane adhesive, comprising the following components by weight percentage: 70% two-component oil-based polyurethane, 10% polyisocyanate modifier, 10% isocyanate-terminated polysiloxane, 5% curing agent, and the remainder solvent.

[0053] Example 4

[0054] This embodiment provides a two-component oil-based polyurethane adhesive, comprising the following components by weight percentage: 50% two-component oil-based polyurethane, 8% polyisocyanate modifier, 18% isocyanate-terminated polysiloxane, 2% curing agent, and the remainder solvent.

[0055] Example 5

[0056] This embodiment provides a two-component oil-based polyurethane adhesive, comprising the following components by weight percentage: 60% two-component oil-based polyurethane, 10% polyisocyanate modifier, 20% isocyanate-terminated polysiloxane, 1% curing agent, and the remainder solvent.

[0057] Comparative Example 1

[0058] A moisture-curing reactive polyurethane hot melt adhesive, model TL5202, was used as a comparative example.

[0059] Comparative Example 2

[0060] A polyurethane hot melt adhesive (DR-1045 from Jiaxing Dingsu Chemical Co., Ltd.) was used as a comparative example.

[0061] Comparative Example 3

[0062] The only difference from Example 1 is that the two-component oily polyurethane is replaced with a one-component oily polyurethane (DS-130 from Jiaxing Dingsu Chemical Co., Ltd.).

[0063] Comparative Example 4

[0064] The only difference from Example 1 is that the two-component oil-based polyurethane adhesive includes the following components by weight percentage: 65% two-component oil-based polyurethane, 15% isocyanate-terminated polysiloxane, 2% curing agent, and the balance solvent.

[0065] Comparative Example 5

[0066] The only difference from Example 1 is that the two-component oil-based polyurethane adhesive includes the following components by weight percentage: 75% two-component oil-based polyurethane, 5% polyisocyanate modifier, 2% curing agent, and the remainder solvent.

[0067] Application Examples 1-5

[0068] The two-component oil-based polyurethane adhesives prepared in Examples 1-5 were used to prepare airbag fabrics, and the preparation method is as follows:

[0069] The two-component oil-based polyurethane adhesive prepared in the example was coated on the surface of a double-layer 210D nylon base fabric. The coating amount was 25 g / m². Then, it was placed in an oven at 180°C for 30 min. After that, it was subjected to composite rolling at a composite roller pressure of 8 kg and a composite roller temperature of 200°C. Finally, it was wound up to obtain the airbag fabric.

[0070] Comparative Application Example 1

[0071] Airbag fabric was prepared using the moisture-curing reactive polyurethane hot melt adhesive of Comparative Example 1. The preparation method includes the following steps:

[0072] Moisture-curing reactive polyurethane hot melt adhesive is heated to 110°C and then coated onto the surface of a double-layer 210D nylon base fabric at a coating weight of 25 g / m². After lamination, the fabric is subjected to a pressure of 8 kg and then wound up to obtain the airbag fabric.

[0073] Comparative Application Example 2

[0074] Airbag fabric was prepared using the moisture-curing reactive polyurethane hot melt adhesive of Comparative Example 2. The preparation method includes the following steps:

[0075] The polyurethane hot melt adhesive is heated to 110°C and then coated onto the surface of a double-layer 210D nylon base fabric at a coating weight of 25g / m². The fabric is then laminated under a pressure of 8kg and finally wound up to obtain the airbag fabric.

[0076] Compare and contrast with example 3-5

[0077] Unlike Application Example 1, the two-component oily polyurethane adhesive prepared in Example 1 was replaced with the adhesive prepared in Comparative Examples 3-5.

[0078] The airbag fabrics prepared in the above application examples and comparative application examples were subjected to performance tests. The test items and test methods are as follows:

[0079] (1) Peel strength: Cut the sample size to 5×20cm. Use solvent to separate the TPU film from the base fabric by about 3cm at 15cm. Clamp the peeled TPU film end with the upper mold of the tensile testing machine and clamp the other end of the sample with the lower mold. Start the test at a speed of 300mm / min. Take the highest value and refer to GB / T 8808-1988.

[0080] (2) Bursting pressure value: tested using a tensile testing machine in constant temperature chambers at 24℃ and 50℃ respectively.

[0081] The test results are shown in Tables 1 and 2.

[0082] Table 1

[0083]

[0084] Table 2

[0085]

[0086] The applicant declares that this invention illustrates the two-component oil-based polyurethane adhesive and airbag fabric and their applications through the above embodiments. However, this invention is not limited to the above embodiments, meaning that this invention does not necessarily rely on the above embodiments for implementation. Those skilled in the art should understand that any improvements to this invention, equivalent substitutions of the raw materials in the product, additions of auxiliary components, and selection of specific methods all fall within the protection and disclosure scope of this invention.

Claims

1. A two-component oil-based polyurethane adhesive, characterized in that, The two-component oil-based polyurethane adhesive comprises the following components by weight percentage: Two-component oil-based polyurethane, 50-70% Polyisocyanate modifiers 3-10% 10-20% isocyanate-terminated polysiloxanes Hardener 1-5% Solvent balance.

2. The two-component oil-based polyurethane adhesive according to claim 1, characterized in that, The modified polyisocyanate is obtained by reacting a polyisocyanate containing isocyanurate groups with an organic compound having active hydrogen.

3. The two-component oil-based polyurethane adhesive according to claim 1 or 2, characterized in that, The organic compound having active hydrogen is an organic compound having a hydroxyl, carboxyl, amino, or thiol group; Preferably, the organic compound having active hydrogen is any one of the following compounds: ； ； ； 。 4. The two-component oil-based polyurethane adhesive according to any one of claims 1-3, characterized in that, The isocyanate-terminated polysiloxane is obtained by reacting a diisocyanate compound with an alcohol hydroxyl-terminated polysiloxane. Preferably, the number-average molecular weight of the isocyanate-terminated polysiloxane is 500 to 2000; Preferably, the mass fraction of isocyanate groups in the isocyanate-terminated polysiloxane is 2-15%.

5. The two-component oil-based polyurethane adhesive according to any one of claims 1-4, characterized in that, The liquid diisocyanate is selected from at least one of isophorone diisocyanate, 2,4-toluene diisocyanate, hexamethylene diisocyanate, or 4,4'-dicyclohexylmethane diisocyanate.

6. The two-component oil-based polyurethane adhesive according to any one of claims 1-5, characterized in that, The curing agent is selected from ethyl acetate; Preferably, the solvent is selected from at least one of cyclohexane, cyclohexanone, toluenecyclohexanone, ethyl acetate, or butanone.

7. An airbag fabric, characterized in that, The airbag fabric includes a base fabric and a two-component oil-based polyurethane adhesive layer covering the upper surface or both surfaces of the base fabric. The two-component oil-based polyurethane adhesive layer is obtained from the two-component oil-based polyurethane adhesive as described above. Preferably, the base fabric is made of double-layer 210D nylon or polyester.

8. The method for preparing airbag fabric according to claim 7, wherein the preparation method comprises the following steps: The airbag fabric is obtained by coating the upper surface or both upper and lower surfaces of the base fabric with the two-component oil-based polyurethane adhesive as described above, followed by oven drying and composite roller pressing.

9. The preparation method according to claim 8, characterized in that, The amount of coating is 20-30 g / m²; Preferably, the temperature of the oven is 170~190℃, and the processing time is 15-40 min; Preferably, the pressure during the composite roller pressing is 6-10 kg; Preferably, the temperature of the composite roller pressing is 200~210℃.

10. A car airbag, characterized in that, The vehicle airbag is made from the airbag fabric described in claim 7.

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