High temperature resistant polyurethane type uv light tack reducing adhesive and preparation method thereof

Abstract

The application provides a high-temperature-resistant polyurethane type UV light adhesion-reducing adhesive and a preparation method thereof. The preparation process comprises the following steps: firstly, removing water from polyester dihydric alcohol or polyether polyol at high temperature, gradually adding isocyanate and a cross-linking agent at a suitable temperature, and accelerating the reaction by using a catalyst to control the reaction rate and uniformity. Then, isocyanate acrylate is added to form a suspended double bond. The synthesized polyurethane type UV light adhesion-reducing adhesive is fully stirred and mixed with anhydrous ethyl acetate solvent, a photoinitiator and an isocyanate cross-linking agent, and a tape is prepared by using a press roller. The prepared polyurethane type UV light adhesion-reducing adhesive has excellent flexibility and high elongation at break. The tape has low peeling strength after UV treatment, no residue after peeling, and high heat resistance up to 200 DEG C, and no adhesive residue within 30 minutes. The tape is particularly suitable for protecting the surface of materials in high-temperature scenes, such as electronic components, automobile parts and other industrial applications, and has wide market application value and important economic significance.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of adhesives, and specifically relates to a high-temperature-resistant polyurethane type UV light tack-reducing adhesive and a preparation method thereof. BACKGROUND

[0002] In modern industry, the application field of UV light-sensitive adhesives is continuously expanding, especially the demand for bonding and protecting material surfaces in high-temperature environments is increasing. However, traditional UV light tack-reducing adhesives often have significant problems such as insufficient flexibility and peeling residue, which makes them difficult to meet the strict performance requirements in key applications such as electronic components and automobile parts. Therefore, developing a new type of polyurethane UV light tack-reducing adhesive with excellent flexibility, high temperature resistance and low peeling force has become a technical challenge that needs to be solved urgently. SUMMARY

[0003] In view of the above problems, the present application provides a high-temperature-resistant polyurethane type UV light tack-reducing adhesive and a preparation method thereof, aiming to solve the shortcomings of existing UV light tack-reducing adhesives in flexibility, high-temperature resistance and peeling force. The adhesive uses long-chain diols as the main raw material, and through precise chemical synthesis and cross-linking design, it realizes excellent flexibility and impact resistance. The use of long-chain diols can effectively improve the elasticity of polyurethane, so that it can adapt to various stress conditions in the application process, thereby ensuring the overall performance stability of the material.

[0004] The purpose of the present application is achieved by the following technical scheme: a preparation method of a high-temperature-resistant polyurethane type UV light tack-reducing adhesive, comprising the following steps:

[0005] After high-temperature water removal of polyester diol or polyether polyol, cooling, nitrogen inlet, adding isocyanate and polyurethane crosslinking agent (trimethylolpropane), stirring for 2-3 hours;

[0006] Add organic tin catalyst, continue to react for 2-3 hours, then add isocyanate acrylate to constant pressure dropping funnel and drop at a rate of 1 drop / s, react for 2-3 hours to form a suspended double bond, and prepare polyurethane adhesive;

[0007] Mix the synthesized adhesive with anhydrous ethyl acetate solvent, photoinitiator and isocyanate crosslinking agent by stirring, and prepare adhesive tape by pressure roller method, and obtain polyurethane type UV light tack-reducing adhesive tape after drying.

[0008] The purpose of step 1 is to remove water and react alcohol with crosslinking agent and isocyanate to form a prepolymer with low viscosity. The purpose of step 2 is to react with the remaining hydroxyl group to form a suspended double bond for subsequent UV tack-reducing process. Step 3 is to remove the solvent and prepare the adhesive tape.

[0009] The isocyanate acrylate mentioned above includes isocyanate methacrylate ethyl ester (MOI) and isocyanate acrylate ethyl ester (AOI);

[0010] The polyester diol or polyether polyol is polyethylene glycol (PEG), polypropylene glycol (PPG), polybutylene glycol (PBD), polytetramethylene glycol (PTMG), polycaprolactone (PCL), polycarbonate diol (PCDL);

[0011] The isocyanate is aliphatic isocyanate, including hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), dicyclohexylmethane-4,4'-diisocyanate (HMDI), xylylene diisocyanate (XDI), tetramethyl m-xylylene diisocyanate (TMXDI);

[0012] The isocyanate crosslinking agent is an aromatic polyisocyanate based on toluene diisocyanate (L75);

[0013] The photoinitiator is 2-hydroxy-2-methyl-1-phenyl-1-propanone (1173), phenyl bis (2,4,6-trimethylbenzoyl) phosphine oxide (819), 1-hydroxy-cyclohexyl-phenyl ketone (184), 2,4,6-trimethylbenzoyl-diphenyl phosphine oxide (TPO);

[0014] The molecular weight of the polydiol is 1000-5000 g / mol. The isocyanate index R value (i.e. the molar ratio of isocyanate groups to hydroxyl groups in the polydiol) used during the synthesis of the prepolymer is between 0.5 and 0.9, and the remaining unreacted hydroxyl groups react with isocyanate acrylate and isocyanate crosslinking agent (hydroxyl groups are just reacted or excess);

[0015] The application provides a high-temperature-resistant polyurethane type UV light adhesion-reducing glue prepared by the preparation method, and the UV light adhesion-reducing glue comprises the following raw materials in mass fraction: 0.01-1wt% of a photoinitiator; 0.002-0.1wt% of an organic tin catalyst; and 0.25-2wt% of an isocyanate crosslinking agent.

[0016] Compared with the prior art, the high-temperature-resistant polyurethane type UV light adhesion-reducing glue has the following remarkable advantages:

[0017] Excellent flexibility: long-chain diols are used as main raw materials, which significantly improve the elasticity and impact resistance of the adhesive. This makes the material better adapt to deformation and reduces the risk of rupture when facing mechanical stress.

[0018] High temperature resistance: By adding isocyanate crosslinking agent to build a deep crosslinking network, the adhesive can still maintain stable physical properties and bonding strength in an environment up to 200℃. This feature far exceeds most existing UV light tack-free adhesives, and is suitable for a wider range of high-temperature application scenarios.

[0019] Low peeling force and no residue: By adding isocyanate acrylate to introduce high double bond density design, the adhesive has low peeling force and no residue phenomenon after UV irradiation, avoiding the common residue problem of traditional adhesives during peeling, which is particularly important for applications that require a clean surface.

[0020] In summary, the polyurethane type UV light tack-free adhesive prepared by the present application has excellent flexibility and high elongation at break. The adhesive tape has low peeling strength after UV treatment, no residue after peeling, high heat resistance up to 200℃, and no residue within 30 minutes. It is particularly suitable for protecting the surface of materials in high-temperature scenarios, such as electronic components, automotive parts and other industrial fields, meeting higher market demand and having important economic value and application prospect. In summary, the present application solves many deficiencies in the prior art through optimization of materials and innovation of preparation process, and provides a more reliable and efficient UV light tack-free adhesive. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The gas chromatography mass spectrometry (GC / MS) spectrum of the UV pre-adhesive in Example 1 of the present application. DETAILED DESCRIPTION

[0022] The present application will be further described below in conjunction with specific examples, but the scope of protection of the present application is not limited thereto. Example 1

[0023] Step 1: Preparation of polyurethane adhesive

[0024] In a reaction kettle, 200g of polyethylene glycol (PEG molecular weight 1000) was added and subjected to high-temperature water removal at 120℃ for 2h. After cooling to 60℃, nitrogen was introduced, and 22g of isophorone diisocyanate (IPDI) and 3g of polyurethane crosslinking agent (trimethylolpropane) were added. The mixture was stirred and reacted for 2 hours. Then, 0.1g of organic tin catalyst was added, and the reaction was continued for 3 hours. Finally, 8g of isocyanate methyl acrylate (MOI) was added to a constant-pressure dropping funnel and added at a rate of 1 drop / s, and the reaction was continued for 2 hours.

[0025] Step 2: Preparation of UV tack-free adhesive tape

[0026] The adhesive 100g synthesized in Step 1 was mixed with anhydrous ethyl acetate solvent 10g, photoinitiator 2,4,6-trimethylbenzoyl-diphenyl phosphine oxide (TPO) 0.3g, and aromatic polyisocyanate (L75) 1g based on isocyanate crosslinking agent toluene diisocyanate, and fully stirred, and a 100 micron thick adhesive tape was prepared by a machine roller method, and a polyurethane type UV light adhesive tape was prepared by drying at 120 degrees for 15 minutes.

[0027] In use, the adhesive was coated on the surface to be protected (2.5 cm wide 3 mm thick strip), and three strips of adhesive were taken to test the following: peel strength before UV; whether there was residue after peeling by placing the adhesive tape in an oven at 200°C for 30 minutes; and peel strength after UV by fully curing the adhesive tape under 365nm LED wavelength light. The results showed that the peel strength before UV was 565g, there was no residue after high temperature treatment, and the peel strength after UV was 31g. Example 2

[0028] Step 1: Preparation of polyurethane adhesive

[0029] In a reaction kettle, polyethylene glycol (PEG molecular weight 2000) 200g was subjected to high temperature water removal at 120°C for 2h, then cooled to 60°C, nitrogen was introduced, isophorone diisocyanate (IPDI) 11g and polyurethane crosslinking agent (trimethylolpropane) 2g were added, and stirred for 2h; 0.1g of organic tin catalyst was added, and the reaction was continued for 3h, then isocyanate methyl methacrylate (MOI) 5g was added to a constant pressure dropping funnel and was added at a rate of 1 drop / s, and the reaction was continued for 2h.

[0030] Step 2: Preparation of UV adhesive tape

[0031] The adhesive 100g synthesized in Step 1 was mixed with anhydrous ethyl acetate solvent 10g, photoinitiator 2,4,6-trimethylbenzoyl-diphenyl phosphine oxide (TPO) 0.3g, and aromatic polyisocyanate (L75) 1g based on isocyanate crosslinking agent toluene diisocyanate, and fully stirred, and a 100 micron thick adhesive tape was prepared by a machine roller method, and a polyurethane type UV light adhesive tape was prepared by drying at 120 degrees for 15 minutes. In use, the adhesive was coated on the surface to be protected (2.5 cm wide 3 mm thick strip), and three strips of adhesive were taken to test the following: peel strength before UV; whether there was residue after peeling by placing the adhesive tape in an oven at 200°C for 30 minutes; and peel strength after UV by fully curing the adhesive tape under 365nm LED wavelength light. The results showed that the peel strength before UV was 763g, there was no residue after high temperature treatment, and the peel strength after UV was 52g. Example 3

[0032] Step 1: Preparation of polyurethane adhesive

[0033] In a reaction kettle, polyethylene glycol (PEG molecular weight 1000) 200g was added and high-temperature water removal was carried out at 120°C for 2h. After cooling to 60°C, nitrogen was introduced, and isophorone diisocyanate (IPDI) 22.23g and polyurethane crosslinking agent (trimethylolpropane) 3g were added, and stirred for 2h. Tin catalyst 0.1g was added, and the reaction was continued for 3h. Then isocyanate methacrylate (MOI) 10g was added to a constant-pressure dropping funnel, and was added at a rate of 1 drop / s, and the reaction was carried out for 2h.

[0034] Step 2: Preparation of UV adhesive tape

[0035] The adhesive 100g synthesized in step 1 was mixed with anhydrous ethyl acetate solvent 10g, photoinitiator 2,4,6-trimethylbenzoyl-diphenyl phosphine oxide (TPO) 0.3g, and aromatic polyisocyanate (L75) 1g based on isocyanate crosslinking agent toluene diisocyanate, and was thoroughly stirred and mixed, and was prepared into a 100-micron-thick adhesive tape by a machine roller method, and was dried at 120°C for 15min to obtain a polyurethane-type UV light adhesive tape. In use, the adhesive was coated on the surface to be protected (a 2.5cm wide 3mm thick strip), and three strips of tape were tested as follows: peel strength before UV; the tape was placed in a 200°C oven for 30min, and the residue after peeling was tested; the tape was fully cured by a UV curing device at a 365nm LED wavelength light, and the peel strength of the tape after UV was tested. The results showed that the peel strength before UV was 615g, there was no residue after high-temperature treatment, and the peel strength after UV was 22g. Example 4

[0036] Step 1: Preparation of polyurethane adhesive

[0037] In a reaction kettle, polytetramethylene glycol (PTMG molecular weight 1000) 200g was added and high-temperature water removal was carried out at 120°C for 2h. After cooling to 60°C, nitrogen was introduced, and isophorone diisocyanate (IPDI) 22.23g and polyurethane crosslinking agent (trimethylolpropane) 3g were added, and stirred for 2h. Tin catalyst 0.1g was added, and the reaction was continued for 3h. Then isocyanate methacrylate (MOI) 8g was added to a constant-pressure dropping funnel, and was added at a rate of 1 drop / s, and the reaction was carried out for 2h.

[0038] Step 2: Preparation of UV adhesive tape

[0039] The adhesive 100g synthesized in Step 1 was mixed with anhydrous ethyl acetate solvent 10g, photoinitiator 2,4,6-trimethylbenzoyl-diphenyl phosphine oxide (TPO) 0.3g, and aromatic polyisocyanate (L75) 1g based on isocyanate crosslinking agent toluene diisocyanate, and stirred thoroughly. A 100 micron thick adhesive tape was prepared by a machine roller method, and a polyurethane type UV light adhesive tape was obtained by drying at 120 degrees for 15 minutes. In use, the adhesive was coated on the surface to be protected (a 2.5 cm wide 3 mm thick strip), and three strips were tested as follows: test the peel strength before UV; place the adhesive tape in an oven at 200 degrees C for 30 minutes, test whether there is residue after peeling; test the peel strength of the adhesive tape after UV by fully curing it with a UV curing device at a 365 nm LED wavelength light. The results show that the peel strength before UV is 445g, there is no residue after high temperature treatment, and the peel strength after UV is 26g. Example 5

[0040] Step 1: Preparation of polyurethane adhesive

[0041] In a reaction kettle, polytetramethylene glycol (PTMG, molecular weight 1000) 200g was subjected to high temperature water removal at 120 degrees C for 2h, then cooled to 60 degrees C, and nitrogen was introduced. Dicyclohexylmethane-4,4'-diisocyanate (HMDI) 22.23g and polyurethane crosslinking agent (trimethylolpropane) 8g were added, and stirred and reacted for 2 hours. Tin catalyst 0.1g was added, and the reaction was continued for 3 hours. Isocyanate methyl methacrylate (MOI) 15g was added to a constant pressure dropping funnel, and was added dropwise at a rate of 1 drop / s, and the reaction was continued for 2 hours.

[0042] Step 2: Preparation of UV adhesive tape

[0043] The adhesive 100g synthesized in Step 1 was mixed with anhydrous ethyl acetate solvent 10g, photoinitiator 2,4,6-trimethylbenzoyl-diphenyl phosphine oxide (TPO) 0.3g, and aromatic polyisocyanate (L75) 1g based on isocyanate crosslinking agent toluene diisocyanate, and stirred thoroughly. A 100 micron thick adhesive tape was prepared by a machine roller method, and a polyurethane type UV light adhesive tape was obtained by drying at 120 degrees for 15 minutes. In use, the adhesive was coated on the surface to be protected (a 2.5 cm wide 3 mm thick strip), and three strips were tested as follows: test the peel strength before UV; place the adhesive tape in an oven at 200 degrees C for 30 minutes, test whether there is residue after peeling; test the peel strength of the adhesive tape after UV by fully curing it with a UV curing device at a 365 nm LED wavelength light. The results show that the peel strength before UV is 445g, there is no residue after high temperature treatment, and the peel strength after UV is 26g. Example 6

[0044] Step 1: Preparation of polyurethane adhesive

[0045] In a reaction kettle, 200 g of polyethylene glycol (PEG molecular weight 3000) was added and dehydrated at high temperature for 2 h at 120 °C. After cooling to 60 °C, nitrogen was introduced, and 5 g of isofluroketo diisocyanate (IPDI) and 1 g of polyurethane crosslinker (trimethylolpropane) were added. The mixture was stirred for 2 h. Then, 0.1 g of tin catalyst was added, and the reaction was continued for 3 h. After that, 2 g of isocyanate acrylate (AOI) was added to a constant pressure dropping funnel and was added dropwise at a rate of 1 drop / s for 2 h.

[0046] Step 2: Preparation of UV adhesion-reducing tape

[0047] The adhesive synthesized in Step 1, 100 g, was mixed with 10 g of anhydrous ethyl acetate solvent, 0.3 g of photoinitiator 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (TPO), and 1 g of isocyanate crosslinking agent toluene diisocyanate-based aromatic polyisocyanate (L75). The mixture was thoroughly stirred and prepared into a 100-micron-thick adhesive tape using a machine roller method. The polyurethane UV light adhesion-reducing adhesive tape was obtained after drying at 120 °C for 15 min. During use, the adhesive was applied to the surface to be protected (a 2.5 cm wide and 3 mm thick strip), and three strips of the adhesive were tested as follows: the peel strength before UV; the peel strength after heating in a 200 °C oven for 30 min; and the peel strength after UV curing with a UV curing device at a 365 nm LED wavelength. The results showed that the peel strength before UV was 911 g, there was slight residual glue after high-temperature treatment, and the peel strength after UV was 132 g.

[0048] Examples 1, 3, and 4 were good cases, and the performance of the corresponding adhesive tapes was different due to different raw materials and ratios. In Example 5, the excess polyurethane crosslinker resulted in insufficient residual hydroxyl groups in the adhesive, and the isocyanate crosslinking agent did not work during the subsequent high-temperature preparation of the adhesive tape, leading to high-temperature residual glue. In Example 6, the molecular weight of the polyethylene glycol was too large, the crosslinking density of the product was insufficient, and the reaction was not complete, resulting in slight residual glue. The gas chromatography-mass spectrometry (GC / MS) spectrum of the adhesive in Example 1 is shown in Figure 1 Comparative Example 1

[0049] Step 1: Preparation of polyurethane adhesive

[0050] ​In a reaction kettle, polyethylene glycol (PEG molecular weight 1000) 200 g was added and high-temperature water removal was carried out at 120°C for 2 h. After cooling to 60°C, nitrogen was introduced, and isophorone diisocyanate (IPDI) 22.23 g and polyurethane crosslinking agent (trimethylolpropane) 3 g were added, and stirring was carried out for 2 h. Tin catalyst 0.1 g was added, and the reaction was continued for 3 h. Then, isocyanate methyl methacrylate (MOI) 1 g was added to a constant-pressure dropping funnel, and was added at a rate of 1 drop / s, and the reaction was carried out for 2 h.

[0051] Step 2: Preparation of UV adhesive tape

[0052] The glue synthesized in step 1 100 g was mixed with anhydrous ethyl acetate solvent 10 g, photoinitiator 2,4,6-trimethylbenzoyl-diphenyl phosphine oxide (TPO) 0.3 g, and isocyanate crosslinking agent toluene diisocyanate-based aromatic polyisocyanate (L75) 1 g, and was fully stirred and mixed, and was prepared into a 100-μm-thick adhesive tape by a machine roller method, and was dried at 120°C for 15 min to obtain a polyurethane type UV light adhesive tape. In use, the adhesive was coated on the surface to be protected (3 mm thick long strip of 2.5 cm width), and three strips of adhesive tape were taken for the following tests: test of peel strength before UV; the adhesive tape was placed in an oven at 200°C for 30 min, and the residue after peeling was tested; the adhesive tape was fully cured by a UV curing device at a wavelength of 365 nm LED light, and the peel strength of the adhesive tape after UV was tested. The results showed that the peel strength of the formula before UV was 665 g, there was no residue after high-temperature treatment, and the peel strength after UV was 318 g. Comparative Example 2

[0053] Step 1: Preparation of polyurethane glue

[0054] In a reaction kettle, polyethylene glycol (PEG molecular weight 1000) 200 g was added and high-temperature water removal was carried out at 120°C for 2 h. After cooling to 60°C, nitrogen was introduced, and isophorone diisocyanate (IPDI) 22.23 g and polyurethane crosslinking agent (trimethylolpropane) 3 g were added, and stirring was carried out for 2 h. Tin catalyst 0.1 g was added, and the reaction was continued for 3 h. Then, isocyanate methyl methacrylate (MOI) 1 g was added to a constant-pressure dropping funnel, and was added at a rate of 1 drop / s, and the reaction was carried out for 2 h.

[0055] Step 2: Preparation of UV adhesive tape

[0056] The adhesive 100g synthesized in Step 1 was mixed with anhydrous ethyl acetate solvent 10g, photoinitiator 2,4,6-trimethylbenzoyl-diphenyl phosphine oxide (TPO) 0.3g, and aromatic polyisocyanate (L75) 0.1g based on isocyanate crosslinking agent toluene diisocyanate, and stirred thoroughly, and a 100 micron thick adhesive tape was prepared by a machine roller method, and a polyurethane type UV light debonding adhesive tape was prepared by drying at 120 degrees for 15 minutes. In use, the adhesive was coated on the surface to be protected (a 2.5 cm wide 3 mm thick strip), and three strips were taken and tested as follows: test the peel strength before UV; place the adhesive tape in an oven at 200 degrees C for 30 minutes, test whether there is residue after peeling; test the peel strength of the adhesive tape after UV by fully curing it with a UV curing device at a 365 nm LED wavelength light. The results show that the peel strength before UV is 561g, the residue after high temperature treatment, and the peel strength after UV is 52g. Comparative Example 3

[0057] Step 1: Preparation of polyurethane adhesive

[0058] In a reaction kettle, polyethylene glycol (PEG molecular weight 1000) 200g was subjected to high temperature water removal at 120 degrees C for 2h, then cooled to 60 degrees C, nitrogen was introduced, isophorone diisocyanate (IPDI) 22.23g and polyurethane crosslinking agent (trimethylolpropane) 3g were added, and stirred and reacted for 2 hours; 0.1g of organic tin catalyst was added, and the reaction was continued for 3 hours, then isocyanate methyl methacrylate (MOI) 8g was added to a constant pressure dropping funnel, and was added at a rate of 1 drop / s, and the reaction was continued for 2 hours.

[0059] Step 2: Preparation of UV debonding adhesive tape

[0060] The adhesive 100g synthesized in Step 1 was mixed with anhydrous ethyl acetate solvent 10g, photoinitiator 2,4,6-trimethylbenzoyl-diphenyl phosphine oxide (TPO) 0.01g, and aromatic polyisocyanate (L75) 1g based on isocyanate crosslinking agent toluene diisocyanate, and stirred thoroughly, and a 100 micron thick adhesive tape was prepared by a machine roller method, and a polyurethane type UV light debonding adhesive tape was prepared by drying at 120 degrees for 15 minutes. In use, the adhesive was coated on the surface to be protected (a 2.5 cm wide 3 mm thick strip), and three strips were taken and tested as follows: test the peel strength before UV; place the adhesive tape in an oven at 200 degrees C for 30 minutes, test whether there is residue after peeling; test the peel strength of the adhesive tape after UV by fully curing it with a UV curing device at a 365 nm LED wavelength light. The results show that the peel strength before UV is 575g, no residue after high temperature treatment, and the peel strength after UV is 422g.

[0061] Compared with Example 1, the amount of isocyanate methacrylate ethyl ester (MOI) is reduced in Comparative Example 1, resulting in insufficient crosslinking density and poor adhesion reduction effect, and the UV peel strength increases significantly; compared with Example 1, the amount of isocyanate crosslinking agent L75 is reduced in Comparative Example 2, resulting in insufficient crosslinking during thermal curing, and residue is generated after high-temperature treatment; compared with Example 1, the amount of photoinitiator TPO is reduced in Comparative Example 3, resulting in insufficient UV curing during UV treatment, and the UV peel strength increases significantly.

[0062] Table 1 Performance test results of high-temperature-resistant polyurethane UV light adhesion reduction glue of different examples and comparative examples

[0063]

[0064] The high-temperature-resistant polyurethane UV light adhesion reduction glue provided by the application uses long-chain diols as the main raw material. This long-chain structure not only enhances the flexibility of the material, but also gives the adhesive better impact resistance, allowing it to effectively absorb and disperse the force when subjected to external stress, thereby maintaining good deformation characteristics. In addition, the preparation process of the adhesive significantly improves its high-temperature resistance through the construction of a crosslinking network (by adding a crosslinking agent), allowing the product to maintain excellent physical properties and bonding strength at temperatures as high as 200°C. This deep crosslinking structure not only improves the thermal stability of the adhesive, but also effectively prevents performance degradation at high temperatures. After UV irradiation, the high double bond density structure formed by the adhesive is the key to achieving low peel strength. High double bond density significantly reduces the peel strength of the material after UV, ensuring no residue during the peeling process. This feature is particularly important for applications that require clean surfaces, such as protective films for electronic components and automotive coatings. In summary, the development of this polyurethane UV light adhesion reduction glue not only meets the needs of high-temperature application scenarios, but also has significant market application potential and economic value, indicating technological innovation and industrial development in related fields.

[0065] The above only describes some embodiments of the application and is not intended to limit the application. Any changes and modifications made in accordance with the content of the application are within the scope of the application.

Claims

1. A method for preparing a high-temperature resistant polyurethane UV light-resistant adhesive, characterized in that, Includes the following steps: a. After dehydrating the polyester diol or polyether polyol at high temperature, cool it down, introduce nitrogen gas, add isocyanate and polyurethane crosslinking agent, and stir to react for 2-3 hours. b. Add organotin catalyst and continue the reaction for 2-3 hours. Then add isocyanate acrylic acid to a constant pressure dropping funnel and add it dropwise at a certain rate. React for 2-3 hours to obtain polyurethane adhesive. c. The synthesized adhesive is thoroughly mixed with anhydrous ethyl acetate solvent, photoinitiator and isocyanate crosslinking agent, and then prepared into tape by roller pressing. After drying, polyurethane UV light anti-tack tape is obtained. The molecular weight of the polyester diol is 1000-2000; The mass ratio of the added polyurethane crosslinking agent to the polyester diol is (1-1.5):100; The mass ratio of added isocyanate acrylic acid to polyester diol is (2.5-5):100; In step c, the mass ratio of the added photoinitiator to the synthesized adhesive is 0.3:100; the mass ratio of the added isocyanate crosslinking agent to the synthesized adhesive is 1:

100. The polyurethane crosslinking agent is trimethylolpropane; The UV light-reducing adhesive comprises the following raw materials in the indicated mass fractions: 0.01-1 wt% photoinitiator; 0.002-0.1 wt% organotin catalyst; and 0.25-2 wt% isocyanate crosslinking agent.

2. The preparation method of a high-temperature resistant polyurethane UV light-resistant adhesive according to claim 1, characterized in that, The isocyanate acrylic acid is selected from ethyl isocyanate methacrylate and ethyl isocyanate acrylate.

3. The preparation method of a high-temperature resistant polyurethane UV light-resistant adhesive according to claim 1, characterized in that, The polyester diol or polyether polyol is selected from polyethylene glycol, polypropylene glycol, polybutane glycol, polycaprolactone diol, and polycarbonate diol.

4. The preparation method of a high-temperature resistant polyurethane UV light-resistant adhesive according to claim 1, characterized in that, The isocyanate in step a is selected from hexamethylene diisocyanate, isoflurane diisocyanate, dicyclohexylmethane-4,4'-diisocyanate, phenyldimethyl diisocyanate, and tetramethyl isophenyldimethyl diisocyanate.

5. The preparation method of a high-temperature resistant polyurethane UV light-resistant adhesive according to claim 1, characterized in that, The isocyanate crosslinking agent is an aromatic polyisocyanate based on toluene diisocyanate.

6. The preparation method of a high-temperature resistant polyurethane UV light-resistant adhesive according to claim 1, characterized in that, The photoinitiator is selected from 2-hydroxy-2-methyl-1-phenyl-1-propanone, phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide, 1-hydroxy-cyclohexyl-phenyl ketone, and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide.

7. The preparation method of a high-temperature resistant polyurethane UV light-resistant adhesive according to claim 1, characterized in that, The organotin catalyst is a dibutyltin dilaurate catalyst.

8. The method for preparing a high-temperature resistant polyurethane UV light-resistant adhesive according to claim 1, characterized in that, When synthesizing the prepolymer, the isocyanate index R value used is between 0.5 and 0.9, and the remaining unreacted hydroxyl groups react with isocyanate acrylate and isocyanate crosslinking agent.

9. A high-temperature resistant polyurethane UV light-resistant adhesive, characterized in that, It is prepared by the preparation method described in any one of claims 1-8.

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