A high-temperature-resistant and high-toughness organosilicon-modified peelable blue glue and its preparation method

Abstract

The present invention discloses a high-temperature resistant and high-toughness organosilicon-modified peelable blue glue and a preparation method thereof. The preparation method comprises: firstly reacting a polysilicone polyol used for synthesizing high-temperature resistant polyurethane with a diisocyanate to form a prepolymer; then using an acrylate double-bond capping agent to carry out an end-capping reaction to generate an organosilicon-modified polyurethane acrylate prepolymer; finally, adding a photoinitiator, an inorganic filler, an acrylate monomer and other additives to prepare a peelable blue glue with excellent comprehensive performance. The method of the present invention solves the problems of insufficient toughness and peeling residue of the existing peelable blue glue. The prepared adhesive not only has excellent flexibility and high elongation at break after UV curing, but also has low peel strength and no residue after peeling, and heat resistance of up to 260 degrees Celsius, and no residual glue within 10 minutes. It is particularly suitable for protecting the surface of materials in high-temperature scenarios and has high application value in specific applications.

Description

Technical Field

[0001] The invention belongs to the technical field of adhesives, and in particular relates to a method for preparing a high-temperature-resistant and high-toughness organosilicon-modified peelable blue adhesive. Background Art

[0002] In many industrial fields, especially those involving high-temperature operations, strict requirements are placed on the protection and use of materials. Traditional adhesives may fail or leave residue under high-temperature conditions, necessitating an adhesive with high-temperature tolerance and high toughness to meet these demands. Silicone-modified adhesives are heat-resistant and residue-free, making them widely used for protecting and bonding materials in high-temperature environments. Their high-temperature resistance stems primarily from the introduction of organosilicon compounds such as siloxane polyols, enabling the adhesive to maintain good adhesion and strength even under high-temperature conditions. Furthermore, silicone-modified adhesives exhibit excellent flexibility and elongation at break, leaving no residue after peeling, making them highly suitable for materials requiring protection in high-temperature environments.

[0003] In the prior art, there is a close relationship between the R value and toughness during the synthesis of polyurethane acrylate (PUA). The R value, typically referring to the molar ratio of isocyanate to polyol in the polyurethane, has a significant impact on its properties. Higher molecular weight polyols generally increase the toughness of the polyurethane because they form more crosslinks and chain segments, enhancing the material's elasticity and impact resistance. An appropriate R value balances hardness and toughness, ensuring the polyurethane possesses both a certain degree of hardness and sufficient toughness to withstand impact and deformation in applications. Therefore, adjusting the R value during the synthesis of polyurethane acrylates can provide a certain degree of control over the material's toughness. By comprehensively considering the influence of the polyol type, isocyanate type, and R value, the toughness of the polyurethane can be optimized and adjusted. Therefore, to achieve heat-resistant, removable polyurethane acrylate tapes with excellent flexibility, high elongation at break, low peel strength, and no residue after peeling, comprehensive formulation considerations are required. Summary of the Invention

[0004] In response to the technical problems existing in the prior art, the present invention aims to provide a high-temperature-resistant, high-toughness organosilicon-modified peelable blue adhesive and its preparation method. This invention introduces organosilicon compounds such as organosilicon polyols into a polyurethane acrylate adhesive. By selecting an appropriate R value, combined with a photoinitiator, inorganic filler, and other additives, a peelable polyurethane acrylate adhesive with excellent overall performance is prepared. This solves the problems of existing peelable blue adhesives in terms of tolerance and peeling residue in high-temperature environments, providing a new solution for protecting material surfaces in high-temperature scenarios.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A method for preparing a high-temperature-resistant and high-toughness organosilicon-modified peelable blue glue comprises the following steps:

[0007] Step 1: Prepare polyurethane acrylate adhesive prepolymer

[0008] Add polysilicone polyol to a reactor, then add diisocyanate based on the appropriate R value. Raise the temperature to 40-70°C and maintain the reaction temperature for 2-4 hours to form a prepolymer. Add an acrylate double bond capping agent to the prepolymer and control the temperature at 50-70°C for a capping reaction of 0.5-3 hours to produce a silicone-modified polyurethane acrylate prepolymer.

[0009] The role of the acrylate double bond capping agent is to improve or impart specific properties to the material by introducing acrylate functional groups at the end of the molecular chain.

[0010] Step 2: Prepare the adhesive

[0011] Add a photoinitiator, inorganic filler, acrylate monomer (the acrylate monomer acts as a curing initiator, increases crosslinking density, and acts as a diluent), and other additives (such as colorants and leveling agents) to the resulting polyurethane acrylate prepolymer in the following mass fractions: 30-60wt% polyurethane acrylate prepolymer, 0.01-1wt% photoinitiator, 5-40wt% inorganic filler, 5-40wt% acrylate monomer, and 0.1-5wt% other additives. Mix these ingredients thoroughly to ensure the inorganic filler is evenly dispersed throughout the adhesive. Place the prepared, high-temperature-resistant, high-toughness silicone-modified peelable blue adhesive into a sealed, light-tight syringe and seal it to prevent contamination or deterioration during storage.

[0012] Furthermore, the diisocyanate mentioned above is an aliphatic isocyanate, such as one or more of isophorone diisocyanate (IPDI), 1,6-hexamethylene diisocyanate (HDI), hydrogenated toluene diisocyanate (H12MDI), cyclohexyl diisocyanate (CHDI), and 1,3-bis(isocyanatomethyl)cyclohexane (BIC).

[0013] Furthermore, the polyorganosilicone polyol mentioned above is one or more of hydroxy-terminated polydimethylsiloxane (OH-PDMS), polydimethylsiloxane (PDMS) polyol, polytrimethylsiloxane (PTMS) polyol, and polysiloxane-polyether block copolymer.

[0014] Furthermore, the molecular weight of the polysilicone polyol is 1000-10000 g / mol. The isocyanate index R value (i.e., the molar ratio of cyanate groups to hydroxyl groups in the polysilicone polyol) used in synthesizing the prepolymer is between 1.05-1.35.

[0015] Furthermore, after the reaction at 40-70 degrees Celsius for 2-4 hours in step 1, the remaining unreacted cyanate groups react with the acrylate double bond capping agent in a molar ratio of 1:0.9-1.05, preferably a molar ratio of 1:1. The amount of the remaining unreacted cyanate groups of the diisocyanate is the amount of the portion where the molar ratio of the cyanate groups of the diisocyanate to the hydroxyl groups of the polysilicone polyol exceeds 1:1.

[0016] Furthermore, the acrylate double bond capping agent mentioned above is hydroxyethyl acrylate (HEA), hydroxypropyl acrylate (HPA), hydroxyethyl methacrylate (HEMA) or hydroxypropyl methacrylate (HPMA).

[0017] Furthermore, the inorganic filler mentioned above is one or more of nano silicon dioxide, nano titanium dioxide or nano aluminum oxide, zinc oxide powder, calcium silicate powder, aluminum hydroxide powder, and magnesium silicate powder.

[0018] Furthermore, the above-mentioned acrylic acid ester monomer is at least one of methyl methacrylate, butyl methacrylate, and ethyl acrylate.

[0019] Compared with existing technologies, this invention offers advantages such as a simple process, low pollution and energy consumption, and readily available raw materials. The resulting silicone-modified peelable blue adhesive exhibits excellent flexibility and high elongation at break after UV curing, as well as low peel strength and no residue after peeling. It also exhibits heat resistance up to 260°C, with no adhesive residue remaining within 10 minutes. This makes it particularly suitable for protecting surfaces in high-temperature environments and possesses high application value in specific applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is the infrared spectrum of the prepolymer obtained in step 1 of Example 2 of the present invention. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to specific embodiments, but the protection scope of the present invention is not limited thereto.

[0022] In the embodiment of the present invention, the blue color paste is 6153-UV, and the leveling agent is BYK-UV3510 from Germany.

[0023] In the embodiment of the present invention, the R value is the molar ratio of the cyanate groups in the diisocyanate to the hydroxyl groups in the polysilicone polyol.

[0024] The hydroxyl-terminated polydimethylsiloxane (OH-PDMS) and polydimethylsiloxane (PDMS) polyol used in the embodiments of the present invention both contain 2 mol of hydroxyl groups per 1 mol molecular weight.

[0025] In the embodiments of the present invention, hydroxyl-terminated polydimethylsiloxane OH-PDMS and polydimethylsiloxane (PDMS) polyol were purchased from Shenzhen Jipeng Silicone Fluoride Materials Co., Ltd. and Shenzhen Guicheng Silicone Co., Ltd., respectively.

[0026] Example 1 Step 1: Preparation of polyurethane acrylate adhesive prepolymer

[0027] 300g of hydroxyl-terminated polydimethylsiloxane (OH-PDMS) with a molecular weight of 2000 was added to a reactor, followed by 35g of isophorone diisocyanate (IPDI), with an isocyanate index (R) of 1.05 used in prepolymer synthesis. The temperature was raised to 60°C and maintained for three hours to form the prepolymer. 1.8g of hydroxyethyl acrylate (HEA) was added to the prepolymer, and the end-capping reaction was carried out at 60°C for two hours to produce a silicone-modified polyurethane acrylate prepolymer.

[0028] Step 2: Prepare the adhesive

[0029] Add a photoinitiator, inorganic filler, acrylate monomer, and other additives (such as colorant and leveling agent) to the resulting polyurethane acrylate prepolymer in the following weight proportions: 300g of the polyurethane acrylate prepolymer obtained in Step 1, 1g of the photoinitiator (2,4,6-trimethylbenzoyl)diphenylphosphine oxide (TPO), 200g of nanosilica, 200g of methyl methacrylate (MMA), 8g of blue colorant, and 2g of leveling agent. Mix these ingredients thoroughly to ensure that the inorganic filler is evenly dispersed throughout the adhesive. Place the prepared, high-temperature-resistant, high-toughness silicone-modified peelable blue adhesive into a sealed, light-tight syringe and seal to prevent contamination or deterioration during storage. When in use, apply the adhesive to the surface to be protected (a 2.5cm wide and 3mm thick strip), cure it with UV curing equipment to ensure that the adhesive is completely cured and adheres to the surface, remove the strip for tensile fracture strain testing, and at the same time, stick the strip on a stainless steel plate for a high-temperature residual adhesive test at 260 degrees Celsius for ten minutes.

[0030] Example 2 Step 1: Preparation of polyurethane acrylate adhesive prepolymer

[0031] 308g of polydimethylsiloxane (PDMS) polyol (molecular weight 2000) was added to a reactor, followed by 38g of isophorone diisocyanate (IPDI), using an isocyanate index (R) of 1.11 for the prepolymer. The temperature was raised to 60°C and maintained for three hours to form the prepolymer. 4g of hydroxyethyl acrylate (HEA) was added to the prepolymer, and the end-capping reaction was carried out at 60°C for two hours to produce a silicone-modified polyurethane acrylate prepolymer.

[0032] Step 2: Prepare adhesive

[0033] Add a photoinitiator, inorganic filler, acrylate monomer, and other additives (such as colorant and leveling agent) to the resulting polyurethane acrylate prepolymer in the following weight proportions: 300g of the polyurethane acrylate prepolymer obtained in Step 1, 2g of the photoinitiator (2,4,6-trimethylbenzoyl)diphenylphosphine oxide (TPO), 150g of zinc oxide powder, 150g of butyl methacrylate (BMA), 6.4g of blue colorant, and 1.6g of leveling agent. Mix all ingredients thoroughly to ensure that the inorganic filler is evenly dispersed throughout the adhesive. Place the prepared, high-temperature-resistant, high-toughness silicone-modified peelable blue adhesive into a sealed, light-tight syringe and seal to prevent contamination or deterioration during storage. When in use, apply the adhesive to the surface to be protected (a 2.5cm wide and 3mm thick strip), cure it with UV curing equipment to ensure that the adhesive is completely cured and adheres to the surface, remove the strip for tensile fracture strain testing, and at the same time, stick the strip on a stainless steel plate for a high-temperature residual adhesive test at 260 degrees Celsius for ten minutes.

[0034] Example 3 Step 1: Preparation of polyurethane acrylate adhesive prepolymer

[0035] 275g of hydroxyl-terminated polydimethylsiloxane (OH-PDMS) with a molecular weight of 1000 was added to a reactor, followed by 68g of isophorone diisocyanate (IPDI), with an isocyanate index (R) of 1.11 used in the prepolymer synthesis. The temperature was raised to 60°C and maintained for three hours to form the prepolymer. 7.2g of hydroxyethyl acrylate (HEA) was added to the prepolymer, and the end-capping reaction was carried out at 60°C for two hours to produce a silicone-modified polyurethane acrylate prepolymer.

[0036] Step 2: Prepare the adhesive

[0037] Add a photoinitiator, inorganic filler, acrylate monomer, and other additives (such as colorant and leveling agent) to the resulting polyurethane acrylate prepolymer in the following weight ratios: 300g of the polyurethane acrylate prepolymer obtained in Step 1, 2g of the photoinitiator (2,4,6-trimethylbenzoyl)diphenylphosphine oxide (TPO), 50g of nanosilica, 250g of ethyl acrylate (EA), 9.6g of blue colorant, and 2.4g of leveling agent. Mix these ingredients thoroughly to ensure that the inorganic filler is evenly dispersed throughout the adhesive. Place the prepared, high-temperature-resistant, high-toughness silicone-modified peelable blue adhesive into a sealed, light-tight syringe and seal to prevent contamination or deterioration during storage. When in use, apply the adhesive to the surface to be protected (a 2.5cm wide and 3mm thick strip), cure it with UV curing equipment to ensure that the adhesive is completely cured and adheres to the surface, remove the strip for tensile fracture strain testing, and at the same time, stick the strip on a stainless steel plate for a high-temperature residual adhesive test at 260 degrees Celsius for ten minutes.

[0038] Example 4 Step 1: Preparation of polyurethane acrylate adhesive prepolymer

[0039] A 1000:268g hydroxy-terminated polydimethylsiloxane (OH-PDMS) was added to a reactor, followed by 74g of isophorone diisocyanate (IPDI), using an isocyanate index (R) of 1.24 for the prepolymer. The temperature was raised to 60°C and maintained for three hours to form the prepolymer. 15.2g of hydroxyethyl methacrylate (HEMA) was then added to the prepolymer, and the end-capping reaction was carried out at 60°C for two hours to produce a silicone-modified polyurethane acrylate prepolymer.

[0040] Step 2: Prepare the adhesive

[0041] Add a photoinitiator, inorganic filler, acrylate monomer, and other additives (such as colorant and leveling agent) to the resulting polyurethane acrylate prepolymer in the following weight ratios: 300g of the polyurethane acrylate prepolymer obtained in Step 1, 1g of the photoinitiator (2,4,6-trimethylbenzoyl)diphenylphosphine oxide (TPO), 150g of nanosilica, 150g of ethyl acrylate (EA), 9.6g of blue colorant, and 2.4g of leveling agent. Mix these ingredients thoroughly to ensure that the inorganic filler is evenly dispersed throughout the adhesive. Place the prepared, high-temperature-resistant, high-toughness silicone-modified peelable blue adhesive into a sealed, light-tight syringe and seal to prevent contamination or deterioration during storage. When in use, apply the adhesive to the surface to be protected (a 2.5cm wide and 3mm thick strip), cure it with UV curing equipment to ensure that the adhesive is completely cured and adheres to the surface, remove the strip for tensile fracture strain testing, and at the same time, stick the strip on a stainless steel plate for a high-temperature residual adhesive test at 260 degrees Celsius for ten minutes.

[0042] Example 5 Step 1: Preparation of polyurethane acrylate adhesive prepolymer

[0043] A polydimethylsiloxane (PDMS) polyol (molecular weight 3000:317g) was added to a reaction kettle, followed by 29g of isophorone diisocyanate (IPDI), using an isocyanate index (R) of 1.23 for the prepolymer synthesis. The temperature was raised to 60°C and maintained for three hours to form the prepolymer. 5.8g of hydroxyethyl acrylate (HEA) was added to the prepolymer, and the end-capping reaction was carried out at 60°C for two hours to produce a silicone-modified polyurethane acrylate prepolymer.

[0044] Step 2: Prepare the adhesive

[0045] Add a photoinitiator, inorganic filler, acrylate monomer, and other additives (such as colorant and leveling agent) to the resulting polyurethane acrylate prepolymer. Add the following weights: 300g of the polyurethane acrylate prepolymer obtained in Step 1, 2g of the photoinitiator (2,4,6-trimethylbenzoyl)diphenylphosphine oxide (TPO), 100g of nanosilica, 200g of methyl methacrylate (MMA), 8g of blue colorant, and 2g of leveling agent. Mix these ingredients thoroughly to ensure that the inorganic filler is evenly dispersed throughout the adhesive. Place the prepared, high-temperature-resistant, high-toughness silicone-modified peelable blue adhesive into a sealed, light-tight syringe and seal to prevent contamination or deterioration during storage. When in use, apply the adhesive to the surface to be protected (a 2.5cm wide and 3mm thick strip), cure it with UV curing equipment to ensure that the adhesive is completely cured and adheres to the surface, remove the strip for tensile fracture strain testing, and at the same time, stick the strip on a stainless steel plate for a high-temperature residual adhesive test at 260 degrees Celsius for ten minutes.

[0046] Example 6 Step 1: Preparation of polyurethane acrylate adhesive prepolymer

[0047] 317g of hydroxyl-terminated polydimethylsiloxane (OH-PDMS) with a molecular weight of 3000 was added to a reactor, followed by 29g of isophorone diisocyanate (IPDI), using an isocyanate index (R) of 1.23 for the prepolymer. The temperature was raised to 60°C and maintained for three hours to form the prepolymer. 5.8g of hydroxyethyl acrylate (HEA) was added to the prepolymer, and the end-capping reaction was carried out at 60°C for two hours to produce a silicone-modified polyurethane acrylate prepolymer.

[0048] Step 2: Prepare the adhesive

[0049] Add a photoinitiator, inorganic filler, acrylate monomer, and other additives (such as colorant and leveling agent) to the resulting polyurethane acrylate prepolymer. Add the following weights: 300g of the polyurethane acrylate prepolymer obtained in Step 1, 2g of the photoinitiator (2,4,6-trimethylbenzoyl)diphenylphosphine oxide (TPO), 100g of nano-titanium dioxide, 200g of methyl methacrylate (MMA), 8g of blue colorant, and 2g of leveling agent. Mix these ingredients thoroughly to ensure that the inorganic filler is evenly dispersed throughout the adhesive. Place the prepared, high-temperature-resistant, high-toughness silicone-modified peelable blue adhesive into a sealed, light-tight syringe and seal to prevent contamination or deterioration during storage. When in use, apply the adhesive to the surface to be protected (a 2.5cm wide and 3mm thick strip), cure it with UV curing equipment to ensure that the adhesive is completely cured and adheres to the surface, remove the strip for tensile fracture strain testing, and at the same time, stick the strip on a stainless steel plate for a high-temperature residual adhesive test at 260 degrees Celsius for ten minutes.

[0050] Example 7 Step 1: Preparation of polyurethane acrylate adhesive prepolymer

[0051] 315g of polydimethylsiloxane (PDMS) polyol (molecular weight 3000) was added to a reactor, followed by 31g of isophorone diisocyanate (IPDI), using an isocyanate index (R) of 1.33 for the prepolymer synthesis. The temperature was raised to 60°C and maintained for three hours to form the prepolymer. 8g of hydroxyethyl acrylate (HEA) was added to the prepolymer, and the end-capping reaction was carried out at 60°C for two hours to produce a silicone-modified polyurethane acrylate prepolymer.

[0052] Step 2: Prepare the adhesive

[0053] Add a photoinitiator, inorganic filler, acrylate monomer, and other additives (such as colorant and leveling agent) to the resulting polyurethane acrylate prepolymer. Add the following weights: 300g of the polyurethane acrylate prepolymer obtained in Step 1, 1g of the photoinitiator (2,4,6-trimethylbenzoyl)diphenylphosphine oxide (TPO), 100g of nanosilica, 200g of methyl methacrylate (MMA), 8g of blue colorant, and 2g of leveling agent. Mix these ingredients thoroughly to ensure that the inorganic filler is evenly dispersed throughout the adhesive. Place the prepared, high-temperature-resistant, high-toughness silicone-modified peelable blue adhesive into a sealed, light-tight syringe and seal to prevent contamination or deterioration during storage. When in use, apply the adhesive to the surface to be protected (a 2.5cm wide and 3mm thick strip), cure it with UV curing equipment to ensure that the adhesive is completely cured and adheres to the surface, remove the strip for tensile fracture strain testing, and at the same time, stick the strip on a stainless steel plate for a high-temperature residual adhesive test at 260 degrees Celsius for ten minutes.

[0054] Examples 1, 2, 5, and 6 are examples with better results. Due to different raw materials and proportions, the corresponding tape performance varies according to different applications. The infrared spectrum of the prepolymer in Example 2 is shown in FIG. Figure 1 As shown, the functional groups above are shown to contain Si-O bonds and polyurethane bonds.

[0055] Comparative Example 1 Step 1: Preparation of polyurethane acrylate adhesive prepolymer

[0056] A polydimethylsiloxane (PDMS) polyol (molecular weight 2000:301g) was added to a reactor, followed by 44.5g of isophorone diisocyanate (IPDI), using an isocyanate index (R) of 1.33 for the prepolymer. The temperature was raised to 60°C and maintained for three hours to form the prepolymer. 11.5g of hydroxyethyl acrylate (HEA) was added to the prepolymer, and the end-capping reaction was carried out at 60°C for two hours to produce a silicone-modified polyurethane acrylate prepolymer.

[0057] Step 2: Prepare the adhesive

[0058] Add a photoinitiator, inorganic filler, acrylate monomer, and other additives (such as colorant and leveling agent) to the resulting polyurethane acrylate prepolymer in the following weight proportions: 300g of the polyurethane acrylate prepolymer obtained in Step 1, 2g of the photoinitiator (2,4,6-trimethylbenzoyl)diphenylphosphine oxide (TPO), 150g of zinc oxide powder, 150g of butyl methacrylate (BMA), 6.4g of blue colorant, and 1.6g of leveling agent. Mix all ingredients thoroughly to ensure that the inorganic filler is evenly dispersed throughout the adhesive. Place the prepared, high-temperature-resistant, high-toughness silicone-modified peelable blue adhesive into a sealed, light-tight syringe and seal to prevent contamination or deterioration during storage. When in use, apply the adhesive to the surface to be protected (a 2.5cm wide and 3mm thick strip), cure it with UV curing equipment to ensure that the adhesive is completely cured and adheres to the surface, remove the strip for tensile fracture strain testing, and at the same time, stick the strip on a stainless steel plate for a high-temperature residual adhesive test at 260 degrees Celsius for ten minutes.

[0059] Comparative Example 2 Step 1: Preparation of polyurethane acrylate adhesive prepolymer

[0060] 308g of polydimethylsiloxane (PDMS) polyol (molecular weight 2000) was added to a reactor, followed by 38g of isophorone diisocyanate (IPDI), using an isocyanate index (R) of 1.11 for the prepolymer. The temperature was raised to 60°C and maintained for three hours to form the prepolymer. 4g of hydroxyethyl acrylate (HEA) was added to the prepolymer, and the end-capping reaction was carried out at 60°C for two hours to produce a silicone-modified polyurethane acrylate prepolymer.

[0061] Step 2: Prepare the adhesive

[0062] Add a photoinitiator, inorganic filler, acrylate monomer, and other additives (such as colorant and leveling agent) to the resulting polyurethane acrylate prepolymer in the following weight proportions: 300g of the polyurethane acrylate prepolymer obtained in Step 1, 2g of the photoinitiator (2,4,6-trimethylbenzoyl)diphenylphosphine oxide (TPO), 150g of zinc oxide powder, 150g of hydroxyethyl acrylate (HEA), 6.4g of blue colorant, and 1.6g of leveling agent. Mix all ingredients thoroughly to ensure the inorganic filler is evenly dispersed throughout the adhesive. Place the prepared, high-temperature-resistant, high-toughness silicone-modified peelable blue adhesive into a sealed, light-tight syringe and seal to prevent contamination or deterioration during storage. When in use, apply the adhesive to the surface to be protected (a 2.5cm wide and 3mm thick strip), cure it with UV curing equipment to ensure that the adhesive is completely cured and adheres to the surface, remove the strip for tensile fracture strain testing, and at the same time, stick the strip on a stainless steel plate for a high-temperature residual adhesive test at 260 degrees Celsius for ten minutes.

[0063] Comparative Example 3 Step 1: Preparation of polyurethane acrylate adhesive prepolymer

[0064] 328g of polydimethylsiloxane (PDMS) polyol (molecular weight 2000) was added to a reactor, followed by 38g of isophorone diisocyanate (IPDI), using an isocyanate index (R) of 1.04, as used in prepolymer synthesis. The temperature was raised to 60°C and maintained for three hours to form the prepolymer. 1.61g of hydroxyethyl acrylate (HEA) was added to the prepolymer, and the end-capping reaction was carried out at 60°C for two hours to produce a silicone-modified polyurethane acrylate prepolymer.

[0065] Step 2: Prepare the adhesive

[0066] Add a photoinitiator, inorganic filler, acrylate monomer, and other additives (such as colorant and leveling agent) to the resulting polyurethane acrylate prepolymer in the following weight proportions: 300g of the polyurethane acrylate prepolymer obtained in Step 1, 2g of the photoinitiator (2,4,6-trimethylbenzoyl)diphenylphosphine oxide (TPO), 150g of zinc oxide powder, 150g of butyl methacrylate (BMA), 6.4g of blue colorant, and 1.6g of leveling agent. Mix all ingredients thoroughly to ensure that the inorganic filler is evenly dispersed throughout the adhesive. Place the prepared, high-temperature-resistant, high-toughness silicone-modified peelable blue adhesive into a sealed, light-tight syringe and seal to prevent contamination or deterioration during storage. When in use, apply the adhesive to the surface to be protected (a 2.5cm wide and 3mm thick strip), cure it with UV curing equipment to ensure that the adhesive is completely cured and adheres to the surface, remove the strip for tensile fracture strain testing, and at the same time, stick the strip on a stainless steel plate for a high-temperature residual adhesive test at 260 degrees Celsius for ten minutes.

[0067] Compared with Example 2, Comparative Example 1 increases the isocyanate index R value, and the end-capping agent HEA is excessive. Excessive cross-linking will make the molecular chain rigid, reduce flexibility and elongation at break, and cause the adhesive to lose its good elastic deformation ability. As shown in Table 1, the fracture strain value of the resulting tape is significantly reduced.

[0068] Comparative Example 2 Compared with Example 2, the type of diluent was changed, the peel strength was increased, and residual glue appeared because the hydroxyl groups on HEA can have a stronger force on the bonding surface.

[0069] Compared with Example 2, Comparative Example 3 increased the amount of polydimethylsiloxane (PDMS) polyol, resulting in excessive polydimethylsiloxane (PDMS) polyol, too low an R value, incomplete reaction, and a significantly decreased breaking strain value of the resulting tape, increased peel strength, and residual adhesive at high temperatures.

[0070] Table 1 Performance test results of silicone modified peelable blue glue in different embodiments and comparative examples

[0071] .

[0072] While achieving peelable adhesive with no residual adhesive, the formula of the present invention explores the influence of other factors such as R value on fracture strain, limits the R value range to 1.05-1.35 when synthesizing the prepolymer, and comprehensively considers properties such as fracture strain value, peel strength, and residual adhesive to obtain a high-temperature resistant and high-toughness peelable blue adhesive.

[0073] The above description is only part of the embodiments of the present invention and is not intended to limit the present invention. All equivalent changes and modifications made based on the content of the present invention are within the scope of protection of the present invention.

Claims

1. A method for preparing a high-temperature resistant and high-toughness organosilicon-modified peelable blue glue, characterized in that: The following steps are involved: Step 1: Mix and stir polysilicone polyol and diisocyanate to react at a temperature of 40-70°C for 2-4 hours to form a prepolymer; Step 2: Adding an acrylate double bond capping agent to the prepolymer obtained in step 1 to perform a capping reaction at 50-70° C. for 0.5-3 hours to generate a polyurethane acrylate prepolymer; Step 3: Adding a photoinitiator, an inorganic filler, an acrylate monomer and other additives to the prepolymer in step 2, mixing them evenly to obtain an adhesive, and sealing the adhesive in a can; The diisocyanate is an aliphatic isocyanate selected from isophorone diisocyanate IPDI, 1,6-hexamethylene diisocyanate HDI, hydrogenated toluene diisocyanate HDI, 12 One or more of MDI, cyclohexyl diisocyanate CHDI, 1,3-bis(isocyanatomethyl)cyclohexane BIC; The polysilicone polyol is one or more of hydroxyl-terminated polydimethylsiloxane OH-PDMS, polydimethylsiloxane (PDMS) polyol, polytrimethylsiloxane (PTMS) polyol, and polysiloxane-polyether block copolymer; The molecular weight of the polysilicone polyol is 2000-10000 g / mol; the isocyanate index R value used in the synthesis of the prepolymer in step 1 is between 1.05 and 1.35, where the R value is the molar ratio of the cyanate group in the diisocyanate to the hydroxyl group in the polysilicone polyol; The molar ratio of the remaining unreacted cyanate groups of the diisocyanate to the acrylate double bond capping agent in step 2 is 1:0.9-1.05; The acrylate double bond capping agent in step 2) is hydroxyethyl acrylate HEA, hydroxypropyl acrylate HPA, hydroxyethyl methacrylate HEMA or hydroxypropyl methacrylate HPMA.

2. The method for preparing a high-temperature resistant and high-toughness organosilicon-modified peelable blue glue according to claim 1, characterized in that: The adhesive in step 3) comprises the following raw materials by weight: 30-60wt% polyurethane acrylate prepolymer, 0.01-1wt% photoinitiator, 5-40wt% inorganic filler, 5-40wt% acrylate monomer, and 0.1-5wt% other additives; the other additives include one or both of color paste and leveling agent.

3. The method for preparing a high-temperature resistant and high-toughness organosilicon-modified peelable blue glue according to claim 2, characterized in that: The adhesive in step 3) comprises the following raw materials by weight: 42-50 wt % of polyurethane acrylate prepolymer, 0.1-0.35 wt % of photoinitiator, 15-28 wt % of inorganic filler, 24.5-40 wt % of acrylate monomer, and 1.3-1.9 wt % of other additives.

4. The method for preparing a high-temperature resistant and high-toughness organosilicon-modified peelable blue glue according to claim 1, characterized in that: The inorganic filler is one or more of nano silicon dioxide, nano titanium dioxide, nano aluminum oxide, zinc oxide powder, calcium silicate powder, aluminum hydroxide powder, and magnesium silicate powder.

5. The method for preparing a high-temperature resistant and high-toughness organosilicon-modified peelable blue glue according to claim 1, characterized in that: In step 3), the acrylate monomer is at least one of methyl methacrylate, butyl methacrylate, and ethyl acrylate.

6. A high-temperature-resistant and high-toughness organosilicon-modified peelable blue glue prepared by the method according to any one of claims 1 to 5.

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