Preparation method of high-temperature-resistant polyurethane spraying adhesive tape and adhesive tape

Abstract

The invention discloses a preparation method of a high-temperature-resistant polyurethane spraying adhesive tape and the adhesive tape. The spraying adhesive tape comprises an upper layer and a lower layer, wherein the upper layer is a reinforcing layer formed by spraying a polyurethane coating; the middle layer is a base material layer made of a glass fiber and aluminum foil composite material; the lower layer is an adhesive layer containing modified phenolic resin and a high-temperature-resistant cross-linking agent. The spraying adhesive tape has excellent high temperature resistance, mechanical strength and wear resistance, and also has good adhesion and chemical corrosion resistance. These properties make it excellent in high temperature and chemical industrial environments.

Description

Technical Field

[0001] The invention relates to the technical field of adhesive tapes, in particular to a preparation method of a high-temperature resistant polyurethane spray adhesive tape and the adhesive tape, belonging to the technical field of adhesive tape manufacturing. Background Art

[0002] The high temperature resistant adhesive tape in the prior art has the problems of poor high temperature resistance and poor flame retardancy. To solve these problems, the present invention provides a new high temperature resistant polyurethane spray adhesive tape and a preparation method thereof. Summary of the invention

[0003] The object of the present invention is to provide a preparation method of a high temperature resistant polyurethane spray tape and a tape to solve one or more of the above-mentioned prior art problems.

[0004] In one aspect, the present invention provides a method for preparing a high temperature resistant polyurethane spray tape, comprising the following steps: S1, covering the surface of the aluminum foil coated with the adhesive with a glass fiber cloth, and forming the substrate layer after lamination; S2, spraying the polyurethane coating on the substrate layer, and obtaining a reinforcement layer after drying, curing, baking and curing; S3, uniformly coating the adhesive on the lower surface of the substrate layer to obtain the adhesive layer, and obtaining the high temperature resistant polyurethane spray tape by cutting.

[0005] In some embodiments, the polyurethane coating is prepared by the following steps: 80 parts by weight of a polyurethane prepolymer and 20 parts by weight of a diisocyanate are uniformly mixed, and a proper amount of butanone is added to adjust the viscosity to a suitable value.

[0006] In some embodiments, the adhesive is prepared by the following steps: 60-80 parts by weight of modified phenolic resin and 15-25 parts by weight of high temperature resistant crosslinking agent are placed in 100-150 parts by weight of propanol and stirred sufficiently, 2-5 parts by weight of p-toluenesulfonic acid are added, the temperature is raised to 60-70° C. and stirred for 5-8 hours, and the temperature is lowered and the material is discharged to obtain the adhesive.

[0007] In some embodiments, the modified phenolic resin is prepared by the following steps: 3 parts by weight of phenolic resin is placed in 40 parts by weight of ethanol, heated to 45-55° C., fully stirred to dissolve, 2 parts by weight of maleic rosin and a composite catalyst (0.2 parts by weight of 4-dimethylaminopyridine and 0.6 parts by weight of dicyclohexylcarbodiimide) are added, heated to 60-70° C., reacted for 2-4 hours, and the solvent is removed by rotary evaporation, cooled to room temperature, filtered, washed, and vacuum dried after complete crystallization to obtain anhydride phenolic resin; 4 parts by weight of anhydride phenolic resin are added to 81 parts by weight of n-butanol, and the mixture is stirred thoroughly to dissolve. 0.3 parts by weight of p-toluenesulfonic acid and 2 parts by weight of 3,5-di-tert-butyl-4-hydroxybenzyl alcohol are added, and the temperature is raised to 75-85° C., and the reaction is performed for 6-8 hours. The solvent is removed by distillation under reduced pressure, and the mixture is cooled to room temperature. After the crystallization is complete, the mixture is filtered, washed, and vacuum dried to obtain a modified phenolic resin.

[0008] In some embodiments, the high temperature resistant cross-linking agent is prepared by the following steps: 3 parts by weight of epoxidized soybean oil are placed in 52 parts by weight of xylene, and after thorough mixing, 2 parts by weight of 2-amino-3-methylpyridine are added, the temperature is raised to 80-95°C for reaction for 3-5 hours, the temperature is lowered to room temperature, and the solvent is removed by reduced pressure distillation to obtain a high temperature resistant crosslinking agent.

[0009] In some embodiments, the composite catalyst includes 0.2 parts by weight of 4-dimethylaminopyridine and 0.6 parts by weight of dicyclohexylcarbodiimide.

[0010] On the other hand, the present invention provides a high temperature resistant polyurethane spray tape, comprising: Upper layer: the upper layer is a reinforcement layer sprayed with polyurethane coating; Middle layer: the middle layer is a substrate layer composed of a composite material of glass fiber and aluminum foil; Lower layer: The lower layer is an adhesive layer comprising a modified phenolic resin and a high temperature resistant cross-linking agent.

[0011] The high temperature resistant polyurethane spray tape prepared by the present invention has the following advantages: 1. Excellent high temperature resistance: The polyurethane spray tape of the present invention adopts high-performance polyurethane coating and modified phenolic resin, which can maintain good physical and chemical properties in high temperature environment and is suitable for various high temperature working scenes.

[0012] 2. High strength and wear resistance: The base material layer composed of glass fiber and aluminum foil composite material provides extremely high mechanical strength and wear resistance, ensuring the service life of the tape in high-intensity environments.

[0013] 3. Good adhesion performance: The adhesive layer made of modified phenolic resin gives the tape excellent adhesion performance, and can firmly adhere to the surface of various substrates, ensuring long-term stable use.

[0014] 4. Chemical corrosion resistance: The chemical stability of polyurethane coating and modified phenolic resin enables the adhesive tape of the present invention to resist corrosion by various chemical substances and is suitable for protective applications in the chemical industry.

[0015] The method for preparing high temperature resistant polyurethane spray tape of the present invention has the following advantages: 1. Simple and easy to implement: The preparation method of the present invention has clear steps, a simple process flow, is easy to operate, and is suitable for large-scale industrial production.

[0016] 2. High-efficiency production: Through processes such as spraying and lamination, a uniform coating and substrate layer can be quickly formed, significantly improving production efficiency and reducing the production cycle.

[0017] 3. High material utilization rate: In the method of the present invention, the utilization rate of various raw materials is high, reducing the generation of waste, lowering production costs, and being beneficial to environmental protection.

[0018] 4. Stable product quality: Strictly control the process parameters of each step to ensure the stable quality and consistent performance of each batch of products, meeting high-quality requirements.

[0019] 5. Wide application range: The preparation method is applicable to the application of various polyurethane coatings and modified phenolic resins, has strong flexibility, can adjust the formula and process parameters according to specific requirements, and is widely applicable to the production of high-temperature resistant protective tapes in different fields.

[0020] Generally speaking, the high-temperature resistant polyurethane spraying tape of the present invention has excellent high-temperature resistance, high strength, wear resistance, good adhesion, and chemical corrosion resistance. Its preparation method is simple and efficient, with a high material utilization rate, stable product quality, and a wide application range. This tape has broad application prospects and market competitiveness in high-temperature protection and the chemical industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of a high-temperature resistant polyurethane spraying tape in an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0022] The present invention will be further described below in conjunction with embodiments. The following embodiments are only used to more clearly illustrate the performance of the present invention and cannot be limited only to the following embodiments.

[0023] Embodiment 1: Such as Figure 1 , a preparation method of a high-temperature resistant polyurethane spraying tape, comprising the following steps: S1. Preparation of the substrate 2: Cover a glass fiber cloth on the surface of an aluminum foil coated with an adhesive, and form the substrate layer 2 after lamination treatment; S2. Preparation of the reinforcing layer 1: Mix 1.6 kg of polyurethane prepolymer with 0.4 kg of diisocyanate evenly, and add an appropriate amount of methyl ethyl ketone to adjust the viscosity to be suitable for spraying; S3. Preparation of the adhesive layer 3: Place 0.06 kg of phenolic resin in 0.8 kg of ethanol, heat up to 50 °C, and stir well to dissolve it. Add 0.04 kg of maleic rosin and a composite catalyst (0.004 kg of 4-dimethylaminopyridine and 0.012 kg of dicyclohexylcarbodiimide), heat up to 65 °C, react for 3 hours, remove the solvent by rotary evaporation, cool to room temperature, filter, wash, and vacuum dry after complete crystallization to obtain acid anhydride-modified phenolic resin; Add 0.08 kg of modified phenolic resin to 1.62 kg of n-butanol, stir well to dissolve it, add 0.006 kg of p-toluenesulfonic acid and 0.04 kg of 3,5-di-tert-butyl-4-hydroxybenzyl alcohol, heat up to 80 °C, react for 7 hours, remove the solvent by vacuum distillation, cool to room temperature, filter, wash, and vacuum dry after complete crystallization to obtain modified phenolic resin; Place 0.06 kg of epoxy soybean oil in 1.04 kg of xylene, mix well, add 0.04 kg of 2-amino-3-methylpyridine, heat up to 85 °C and react for 4 hours, cool to room temperature, and remove the solvent by vacuum distillation to obtain a high-temperature resistant crosslinking agent; Place 1.4 kg of modified phenolic resin and 0.4 kg of high-temperature resistant crosslinking agent in 2.5 kg of propanol and stir well, add 0.06 kg of p-toluenesulfonic acid, heat up to 65 °C and stir for 6 hours, cool down and discharge to obtain an adhesive; S4. Preparation of the spray protective tape: Spray the polyurethane coating obtained in step S2 on the substrate layer in step S1, dry and cure at room temperature for 12 hours, then bake at 50 °C for 24 hours, and finally cure at normal temperature for 5 days to form a high-temperature resistant insulating coating; Uniformly apply the adhesive prepared in step S3 on the lower surface of the substrate layer, and cut it into high-temperature resistant tapes of various sizes.

[0024] Example 2: A preparation method of a high-temperature resistant polyurethane spray tape, comprising the following steps: S1. Preparation of the substrate layer: Cover the surface of the aluminum foil coated with an adhesive with a glass fiber cloth, and form the substrate layer after pressing treatment; S2. Preparation of the reinforcing layer: Mix 2.4 kg of polyurethane prepolymer and 0.6 kg of diisocyanate evenly, and add an appropriate amount of methyl ethyl ketone to adjust the viscosity to a suitable value for spraying; S3. Preparation of the adhesive layer: Place 0.09 kg of phenolic resin in 1.2 kg of ethanol, heat up to 55 °C, stir well to dissolve it, add 0.06 kg of maleic rosin and a composite catalyst (0.006 kg of 4-dimethylaminopyridine and 0.018 kg of dicyclohexylcarbodiimide), heat up to 70 °C, react for 4 hours, remove the solvent by rotary evaporation, cool to room temperature, filter, wash, and vacuum dry after complete crystallization to obtain acid anhydride-modified phenolic resin; Add 0.12 kg by weight of the modified phenolic resin to 2.43 kg of n-butanol, stir well to dissolve it, add 0.009 kg of p-toluenesulfonic acid and 0.06 kg of 3,5-di-tert-butyl-4-hydroxybenzyl alcohol, raise the temperature to 85 °C, react for 8 hours, distill off the solvent under reduced pressure, cool to room temperature, filter, wash and dry in vacuum after complete crystallization to obtain the modified phenolic resin; Place 0.09 kg of epoxy soybean oil in 1.56 kg of xylene, mix well, add 0.06 kg of 2-amino-3-methylpyridine, raise the temperature to 95 °C and react for 5 hours, cool to room temperature, distill off the solvent under reduced pressure to obtain the high-temperature resistant crosslinking agent; Place 2.4 kg of the modified phenolic resin and 0.75 kg of the high-temperature resistant crosslinking agent in 4.5 kg of propanol, stir well, add 0.15 kg of p-toluenesulfonic acid, raise the temperature to 70 °C and stir for 8 hours, cool and discharge to obtain the adhesive; S4. Preparation of the spray protective tape: Spray the polyurethane coating obtained in step S2 on the substrate layer in step S1, dry and cure at room temperature for 12 hours, then bake at 50 °C for 24 hours, and finally cure at normal temperature for 5 days to form the high-temperature resistant insulating coating; Uniformly apply the adhesive prepared in step S3 on the lower surface of the substrate layer and cut it into various sizes of high-temperature resistant tapes.

[0025] Example 3: A preparation method of a high-temperature resistant polyurethane spray tape, comprising the following steps: S1. Preparation of the substrate layer: Cover the surface of the aluminum foil coated with the adhesive with the fiberglass cloth, and form the substrate layer after pressing treatment; S2. Preparation of the reinforcing layer: Mix 1.2 kg of polyurethane prepolymer and 0.3 kg of diisocyanate evenly, and add an appropriate amount of methyl ethyl ketone to adjust the viscosity to a suitable value for spraying; S3. Preparation of the adhesive layer: Place 0.045 kg of phenolic resin in 0.6 kg of ethanol, raise the temperature to 55 °C, stir well to dissolve it, add 0.03 kg of maleic rosin and a composite catalyst (0.003 kg of 4-dimethylaminopyridine and 0.009 kg of dicyclohexylcarbodiimide), raise the temperature to 60 °C, react for 2 hours, remove the solvent by rotary evaporation, cool to room temperature, filter, wash and dry in vacuum after complete crystallization to obtain the anhydride-modified phenolic resin; Add 0.06 kg by weight of the modified phenolic resin to 1.215 kg of n-butanol, stir well to dissolve it, add 0.0045 kg of p-toluenesulfonic acid and 0.009 kg of 3,5-di-tert-butyl-4-hydroxybenzyl alcohol, raise the temperature to 75 °C, react for 6 hours, distill off the solvent under reduced pressure, cool to room temperature, filter, wash and dry in vacuum after complete crystallization to obtain the modified phenolic resin; 0.045 kg of epoxidized soybean oil was placed in 0.78 kg of xylene, and after being fully mixed, 0.03 kg of 2-amino-3-methylpyridine was added, and the temperature was raised to 80° C. for reaction for 3 hours, and then the temperature was lowered to room temperature, and the solvent was removed by vacuum distillation to obtain a high temperature resistant crosslinking agent; 0.9 kg of modified phenolic resin and 0.225 kg of high temperature resistant crosslinking agent were placed in 1.5 kg of propanol and stirred thoroughly, 0.03 kg of p-toluenesulfonic acid was added, the mixture was heated to 60° C. and stirred for 5 hours, and the mixture was cooled and discharged to obtain an adhesive; S4. Preparation of spray protective tape: spray the polyurethane coating obtained in step S2 on the substrate layer in step S1, dry and cure at room temperature for 12 hours, then dry at 50°C for 24 hours, and finally cure at room temperature for 5 days to form a high-temperature resistant insulating coating; evenly apply the adhesive prepared in step S3 on the lower surface of the substrate layer, and cut it into high-temperature resistant tapes of various sizes.

[0026] The structure of the high temperature resistant polyurethane spray tape obtained by the above method is as follows Figure 1 As shown: A high temperature resistant polyurethane spray tape, comprising: Upper layer: the upper layer is a reinforcement layer 1 sprayed with polyurethane coating; Middle layer: The middle layer is a substrate layer 2 composed of a composite material of glass fiber and aluminum foil; Lower layer: The lower layer is an adhesive layer 3 comprising a modified phenolic resin and a high temperature resistant cross-linking agent.

[0027] The performance tests were performed on the adhesive tapes prepared in Examples 1 to 3: 1. Temperature resistance test Method: The tape samples were heat treated at 250℃ and 350℃ respectively to evaluate their high temperature resistance.

[0028] 2. Adhesion test Method: Measure the adhesion of tapes on different substrates such as steel, aluminum, and glass through a 180-degree peel test.

[0029] 3. Aging resistance test Method: The tape samples were exposed to UV light (1000 hours) and hot and humid environment (60°C, 90% relative humidity, 500 hours) to test their aging resistance.

[0030] 4. Tensile strength and elongation at break test Method: Use a universal material testing machine to measure the tensile strength and elongation at break of the tape.

[0031] These test results indicate that the high-temperature resistant polyurethane spray tape performs excellently in terms of temperature resistance, adhesion, aging resistance, tensile strength, and elongation at break. It is suitable for protection applications in high-temperature environments, can maintain stable physical properties and adhesion under extreme conditions, and extend the service life. The tape prepared by the method of the present invention will be widely applied in fields such as aerospace, automotive manufacturing, and the electronics industry.

[0032] In summary: The high-temperature resistant polyurethane spray tape of the present invention, by using high-performance polyurethane coatings and modified phenolic resins, demonstrates excellent high-temperature resistance, mechanical strength, and wear resistance, while also having good adhesion and chemical corrosion resistance. These characteristics enable it to perform outstandingly in high-temperature and chemical industrial environments.

[0033] The above description is only the preferred mode of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the creative concept of the present invention, several modifications and improvements can still be made, and these should also be regarded as within the protection scope of the present invention.

Claims

1. A method for preparing a high temperature resistant polyurethane spray tape, characterized in that: The following steps are involved: S1, covering the surface of the aluminum foil coated with adhesive with glass fiber cloth, and forming the substrate layer (2) after lamination; S2, spraying the polyurethane coating on the substrate layer (2), drying, curing, baking and curing to obtain the reinforcement layer (1); S3, uniformly coating the adhesive on the lower surface of the substrate layer (2) to obtain the adhesive layer (3), and cutting to obtain the high temperature resistant polyurethane spray tape.

2. The preparation method according to claim 1, characterized in that: The polyurethane coating is prepared by the following steps: 80 parts by weight of polyurethane prepolymer and 20 parts by weight of diisocyanate are uniformly mixed, and a proper amount of butanone is added to adjust the viscosity to a suitable value.

3. The preparation method according to claim 1, characterized in that: The adhesive is prepared by the following steps: 60-80 parts by weight of modified phenolic resin and 15-25 parts by weight of high temperature resistant crosslinking agent are placed in 100-150 parts by weight of propanol and stirred fully, 2-5 parts by weight of p-toluenesulfonic acid are added, the temperature is raised to 60-70° C. and stirred for 5-8 hours, and the temperature is lowered and the material is discharged to obtain the adhesive.

4. The preparation method according to claim 3, characterized in that: The modified phenolic resin is prepared by the following steps: 3 parts by weight of phenolic resin is placed in 40 parts by weight of ethanol, heated to 45-55° C., stirred thoroughly to dissolve, 2 parts by weight of maleic rosin and a composite catalyst are added, heated to 60-70° C., reacted for 2-4 hours, and the solvent is removed by rotary evaporation, cooled to room temperature, filtered, washed, and vacuum dried after complete crystallization to obtain anhydride phenolic resin; 4 parts by weight of anhydride phenolic resin are added to 81 parts by weight of n-butanol, and the mixture is stirred thoroughly to dissolve. 0.3 parts by weight of p-toluenesulfonic acid and 2 parts by weight of 3,5-di-tert-butyl-4-hydroxybenzyl alcohol are added, and the temperature is raised to 75-85° C., and the reaction is performed for 6-8 hours. The solvent is removed by distillation under reduced pressure, and the mixture is cooled to room temperature. After the crystallization is complete, the mixture is filtered, washed, and vacuum dried to obtain a modified phenolic resin.

5. The preparation method according to claim 3, characterized in that: The high temperature resistant cross-linking agent is prepared by the following steps: 3 parts by weight of epoxidized soybean oil are placed in 52 parts by weight of xylene, and after thorough mixing, 2 parts by weight of 2-amino-3-methylpyridine are added, the temperature is raised to 80-95°C for reaction for 3-5 hours, the temperature is lowered to room temperature, and the solvent is removed by reduced pressure distillation to obtain a high temperature resistant crosslinking agent.

6. The preparation method according to claim 3, characterized in that: The composite catalyst includes 0.2 parts by weight of 4-dimethylaminopyridine and 0.6 parts by weight of dicyclohexylcarbodiimide.

7. The high temperature resistant polyurethane spray tape obtained according to the preparation method according to any one of claims 1 to 6.

8. The spray tape according to claim 7, characterized in that: include: Upper layer: the upper layer is a reinforcement layer (1) sprayed with polyurethane coating; Middle layer: the middle layer is a substrate layer (2) composed of a composite material of glass fiber and aluminum foil; Lower layer: The lower layer is an adhesive layer (3) comprising a modified phenolic resin and a high temperature resistant cross-linking agent.

Images