A low temperature resistant hot melt pressure sensitive adhesive and preparation method thereof

Abstract

The present application relates to the technical field of hot melt pressure sensitive adhesives, and specifically discloses a low temperature resistant hot melt pressure sensitive adhesive and a preparation method thereof. A low temperature resistant hot melt pressure sensitive adhesive comprises the following raw materials in parts by mass: 50‑70 parts of styrene-isoprene-styrene block polymer, 60‑75 parts of tackifier, 20‑30 parts of plasticizer, and 0.5‑1 parts of antioxidant; the diblock component content of styrene-isoprene-styrene block polymer is 20‑25%; the tackifier is composed of terpene resin and liquid grafted long-chain alkyl rosin glycerol ester in a mass ratio of (2‑3):1. The hot melt pressure sensitive adhesive obtained in the present application can still maintain high fluidity, initial adhesion and peel strength in a low temperature environment, and has high practical value.

Description

Technical Field

[0001] The present application relates to the technical field of hot melt adhesives, and more specifically, to a low temperature resistant hot melt pressure sensitive adhesive and a preparation method thereof. Background Art

[0002] Hot melt pressure sensitive adhesive is an adhesive based on thermoplastic polymers. It does not contain solvents, is more environmentally friendly and safe to produce, has high production efficiency and relatively low production costs. During use, hot melt pressure sensitive adhesive is applied in a molten state, and after cooling and solidification, light finger pressure can be applied to achieve bonding.

[0003] However, during the application process, the fluidity of hot-melt pressure-sensitive adhesive in low-temperature environments is difficult to ensure, and it is also easy to cause low initial adhesion and peel strength due to the low temperature environment, resulting in the disadvantage of weak adhesion. This problem is particularly prominent in the severe cold temperature conditions in northern my country in winter.

[0004] Therefore, it is necessary to develop a low-temperature resistant hot-melt pressure-sensitive adhesive to meet the use requirements of the hot-melt pressure-sensitive adhesive in a low-temperature environment. Summary of the invention

[0005] In order to improve the fluidity, initial adhesion and peel strength of a hot melt pressure-sensitive adhesive in a low temperature environment, the present application provides a low temperature resistant hot melt pressure-sensitive adhesive and a preparation method thereof.

[0006] In the first aspect, the present application provides a low temperature resistant hot melt pressure sensitive adhesive, which adopts the following technical solution:

[0007] A low-temperature resistant hot-melt pressure-sensitive adhesive comprises the following raw materials in parts by mass: 50-70 parts of styrene-isoprene-styrene block polymer, 60-75 parts of tackifier, 20-30 parts of plasticizer, and 0.5-1 part of antioxidant; the diblock component content of the styrene-isoprene-styrene block polymer is 20-25%; the tackifier is composed of terpene resin and liquid long-chain alkyl grafted rosin glycerol ester in a mass ratio of (2-3):1.

[0008] The hot-melt pressure-sensitive adhesive obtained by the above scheme can still maintain good fluidity when coated in an environment of -30°C. At the same time, the initial adhesion can reach more than 20N, the sustained adhesion can reach more than 50h, and the 180° peel strength can reach more than 20N / 2.5cm. That is, the obtained hot-melt pressure-sensitive adhesive has excellent low-temperature resistance.

[0009] Specifically, the above scheme uses styrene-isoprene-styrene block polymer with a diblock content of 20-25% as the main base material, which has a low glass transition temperature and can effectively reduce the heating temperature during the production and application of hot melt pressure-sensitive adhesives, which is of positive significance for reducing costs and reducing construction difficulty.

[0010] At the same time, terpene resin and liquid rosin glycerol ester grafted with long-chain alkyl are compounded as tackifiers, wherein the peel strength of terpene resin in low temperature environment is relatively high, but since terpene resin may crystallize in low temperature environment, the performance of hot melt pressure-sensitive adhesive is affected. After further compounding liquid rosin glycerol ester grafted with long-chain alkyl, the undesirable phenomenon of crystallization of terpene resin in low temperature environment can be effectively reduced. Moreover, under the influence of long-chain alkyl, the viscosity and softening point of liquid rosin glycerol ester grafted with long-chain alkyl are both low, which further improves the fluidity and wetting effect of hot melt pressure-sensitive adhesive in low temperature environment, thereby effectively improving the peel strength and initial adhesion of hot melt pressure-sensitive adhesive in low temperature environment. In addition, the glass transition temperature of the obtained hot melt pressure-sensitive adhesive is further reduced, thereby further reducing the processing temperature and use temperature of the hot melt pressure-sensitive adhesive.

[0011] In summary, the hot melt pressure-sensitive adhesive obtained by the above scheme has excellent low temperature resistance and has high practical significance.

[0012] In a specific possible implementation manner, the hot melt pressure-sensitive adhesive comprises the following raw materials in parts by mass: 60-65 parts of styrene-isoprene-styrene block polymer, 70-75 parts of tackifier, 22-25 parts of plasticizer, and 0.5-0.8 parts of antioxidant; the diblock component content of the styrene-isoprene-styrene block polymer is 23-25%; the tackifier is composed of terpene resin and liquid grafted long-chain alkyl rosin glycerol ester in a mass ratio of (2.3-2.8):1.

[0013] In a specific embodiment, the styrene content of the styrene-isoprene-styrene block polymer is 15-20%.

[0014] In a specific embodiment, the liquid rosin glycerol ester grafted with a long-chain alkyl group is obtained by modifying rosin glycerol ester with a long-chain alkyl silicone oil.

[0015] By adopting the above technical solution, due to the low viscosity of long-chain alkyl silicone oil and good compatibility with other polymers, it also has excellent properties such as low temperature resistance, high temperature resistance, aging resistance, and moisture resistance. The long-chain alkyl silicone oil is grafted to rosin glycerol ester by hydrosilylation, which can not only effectively improve the compatibility of rosin glycerol ester in the system, but also further improve the fluidity, wetting ability, peel strength and initial adhesion of the hot melt pressure-sensitive adhesive in a low temperature environment based on the influence of the long-chain alkyl silicone oil, and the glass transition temperature is further reduced, and the practicality is better.

[0016] In a specific possible implementation method, the preparation method of the liquid long-chain alkyl grafted rosin glycerol ester is as follows: long-chain alkyl silicone oil is added to an organic solvent and heated under a nitrogen atmosphere until it is completely dissolved, and then rosin glycerol ester and a catalyst are added in sequence, and a crude product is obtained after heating reaction; the crude product is extracted, distilled under reduced pressure, and dried in sequence to obtain liquid long-chain alkyl grafted rosin glycerol ester.

[0017] In a specific embodiment, the mass of the long-chain alkyl silicone oil accounts for 17-22% of the mass of the rosin glycerol ester.

[0018] In a specific embodiment, the reaction temperature is 95-105° C., and the reaction time is 8-12 h.

[0019] In a specific embodiment, the plasticizer is composed of cyclohexane oil and dioctyl sebacate in a mass ratio of (1.5-2.2):1.

[0020] By adopting the above technical scheme, cycloalkane oil and dioctyl sebacate are compounded as plasticizers, wherein cycloalkane oil has some properties of aromatics and some properties of straight-chain hydrocarbons, and has the characteristics of low pour point, high density, high viscosity, no toxic side effects, etc., and has good fluidity under low temperature environment, and good compatibility with other polymers. Dioctyl sebacate has high plasticizing efficiency, low volatility, excellent low temperature resistance, heat resistance and light resistance, and has good lubricity when heated. Therefore, the compound of cycloalkane oil and dioctyl sebacate as plasticizer can effectively reduce the melt viscosity and melting temperature of hot melt pressure-sensitive adhesive, accelerate the melting speed of hot melt pressure-sensitive adhesive; at the same time, it helps to improve the flexibility of hot melt pressure-sensitive adhesive and the bonding performance under low temperature environment.

[0021] In a specific embodiment, the antioxidant includes at least one of antioxidant 1010 , 2,6-di-tert-butyl-p-cresol, and antioxidant 168 .

[0022] In a second aspect, the present application provides a method for preparing a low-temperature resistant hot-melt pressure-sensitive adhesive, which adopts the following technical solution:

[0023] A method for preparing a low-temperature resistant hot-melt pressure-sensitive adhesive comprises the following steps:

[0024] Heat the plasticizer and antioxidant in a nitrogen atmosphere until the temperature reaches 100°C-105°C, add the tackifier and heat until it melts, then add the styrene-isoprene-styrene block polymer, continue to heat to 120-130°C until the polymer is completely melted, and obtain the hot melt pressure-sensitive adhesive after cooling.

[0025] In summary, this application has the following beneficial effects:

[0026] 1. The present application uses styrene-isoprene-styrene block polymer as the main base material, uses a compound of terpene resin and liquid grafted long-chain alkyl rosin glycerol ester as a tackifier, and uses a plasticizer and an antioxidant in combination. The obtained hot melt pressure-sensitive adhesive has excellent fluidity, initial adhesion and peel strength in a low temperature environment; and effectively reduces the processing temperature and use temperature of the hot melt pressure-sensitive adhesive, which not only reduces the production cost, but also reduces the difficulty of processing and using the hot melt pressure-sensitive adhesive.

[0027] 2. This application uses long-chain alkyl silicone oil to modify rosin glycerol ester to obtain liquid long-chain alkyl grafted rosin glycerol ester. Under the influence of long-chain alkyl silicone oil, the liquid long-chain alkyl grafted rosin glycerol ester has excellent properties such as low viscosity, good compatibility, low temperature resistance, high temperature resistance, aging resistance, and moisture resistance. It can effectively improve the fluidity, wetting ability, peel strength and initial adhesion of hot melt pressure-sensitive adhesives in low temperature environments, and the glass transition temperature is further reduced, and the practicality is better.

[0028] 3. The present application uses a compound of cycloalkane oil and dioctyl sebacate as a plasticizer. The cycloalkane oil and dioctyl sebacate work synergistically in the system to produce a plasticizing effect of one plus one greater than two, thereby effectively reducing the melt viscosity and the temperature required for melting of the hot melt pressure-sensitive adhesive, and accelerating the melting rate of the hot melt pressure-sensitive adhesive; at the same time, it helps to improve the flexibility of the hot melt pressure-sensitive adhesive and the bonding performance in low temperature environments. DETAILED DESCRIPTION

[0029] The present application is further described in detail below in conjunction with the embodiments and comparative examples. The raw materials involved in the present application can all be obtained commercially, among which styrene-isoprene-styrene block polymer was purchased from Sinopec Baling Petrochemical Branch; terpene resin was purchased from Henan Shuangjie Chemical Co., Ltd., CAS: 9003-74-1; rosin glycerol ester was purchased from Jinan Xuchuang Chemical Technology Co., Ltd., model 138; long-chain alkyl silicone oil was purchased from Shandong Xinrunjin Chemical Co., Ltd., with a viscosity of 400-500mpa.s at 25°C; cycloalkane oil was purchased from Jinan Xinhaoyuan Chemical Co., Ltd., model KN4006; long-chain higher fatty acids were purchased from Jinan Century Tongda Chemical Co., Ltd., model H18; liquid C5 petroleum resin was purchased from Jinan Xinquan Chemical Technology Co., Ltd., CAS: 109-66-0.

[0030] Example 1

[0031] A low temperature resistant hot melt pressure sensitive adhesive, comprising the following raw materials: 63 kg of styrene-isoprene-styrene block polymer, 72 kg of tackifier, 24 kg of plasticizer, and 0.8 kg of antioxidant;

[0032] The diblock content of the styrene-isoprene-styrene block polymer is 25%, and the styrene content is 18%; the plasticizer is composed of cyclohexane oil and dioctyl sebacate in a mass ratio of 1.7:1;

[0033] The antioxidant is antioxidant 1010;

[0034] The tackifier is composed of terpene resin and liquid rosin glycerol ester grafted with long-chain alkyl groups in a mass ratio of 2.6:1; wherein the liquid rosin glycerol ester grafted with long-chain alkyl groups is obtained by modifying rosin glycerol ester with long-chain alkyl silicone oil, and the specific preparation method is as follows:

[0035] 10 g of long-chain alkyl silicone oil was added to 150 ml of anhydrous toluene and heated to completely dissolve under a nitrogen atmosphere, and then 50 g of rosin glycerol ester and 0.1 ml of chloroplatinic acid-isopropanol solution were added in sequence, and the mixture was heated to 105° C. and kept for reaction for 12 hours to obtain a crude product; the crude product was extracted three times with a methanol aqueous solution having a volume concentration of 50%, and the upper liquid was retained each time the extraction was performed; the toluene was then removed by reduced pressure distillation, the temperature of the reduced pressure distillation was 45° C., and the vacuum degree was -0.095 MPa; and then after vacuum drying at 40° C. for 2 hours, liquid rosin glycerol ester grafted with a long-chain alkyl group was obtained.

[0036] The preparation method of the low temperature resistant hot melt pressure sensitive adhesive comprises the following steps:

[0037] The plasticizer and antioxidant are heated in a nitrogen atmosphere until the temperature reaches 100°C, a tackifier is added and heated until it melts, and then styrene-isoprene-styrene block polymer is added and the temperature is continued to rise to 125°C until the polymer is completely melted, and a hot melt pressure-sensitive adhesive is obtained after cooling.

[0038] The difference between Example 2-5 and Example 1 is that the raw material ratios used for the low-temperature resistant hot-melt pressure-sensitive adhesive are different, as shown in the following table.

[0039] Table 1 Raw material ratio table

[0040]

[0041]

[0042] Example 6

[0043] The difference between this embodiment and embodiment 1 is that the liquid rosin glycerol ester grafted with long-chain alkyl groups is obtained by modifying rosin glycerol ester with long-chain higher fatty acids, and the specific preparation method is as follows:

[0044] 50 g of rosin glycerol ester and 10 g of long-chain higher fatty acid were mixed, the temperature was raised to 230° C., and the temperature was kept for 8 hours to obtain liquid rosin glycerol ester grafted with long-chain alkyl groups.

[0045] Example 7

[0046] The difference between this embodiment and embodiment 1 is that the diblock component content of the styrene-isoprene-styrene block polymer is 20%.

[0047] Example 8

[0048] The difference between this embodiment and embodiment 1 is that the diblock component content of the styrene-isoprene-styrene block polymer is 23%.

[0049] Example 9

[0050] The difference between this embodiment and embodiment 1 is that the tackifier is composed of terpene resin and liquid rosin glycerol ester grafted with long-chain alkyl in a mass ratio of 2:1.

[0051] Example 10

[0052] The difference between this embodiment and embodiment 1 is that the tackifier is composed of terpene resin and liquid rosin glycerol ester grafted with long-chain alkyl in a mass ratio of 3:1.

[0053] Embodiment 11

[0054] The difference between this embodiment and embodiment 1 is that the tackifier is composed of terpene resin and liquid rosin glycerol ester grafted with long-chain alkyl in a mass ratio of 2.3:1.

[0055] Example 12

[0056] The difference between this embodiment and embodiment 1 is that the tackifier is composed of terpene resin and liquid rosin glycerol ester grafted with long-chain alkyl in a mass ratio of 2.8:1.

[0057] Embodiment 13

[0058] The difference between this embodiment and embodiment 1 is that the styrene content of the styrene-isoprene-styrene block polymer is 15%.

[0059] Embodiment 14

[0060] The difference between this embodiment and embodiment 1 is that the styrene content of the styrene-isoprene-styrene block polymer is 20%.

[0061] Embodiment 15

[0062] The difference between this embodiment and embodiment 1 is that in the preparation of the liquid long-chain alkyl grafted rosin glycerol ester, the amount of long-chain alkyl silicone oil used is 8.5 g, and the amount of rosin glycerol ester used is 50 g.

[0063] Example 16

[0064] The difference between this embodiment and embodiment 1 is that in the preparation of the liquid long-chain alkyl grafted rosin glycerol ester, the amount of long-chain alkyl silicone oil used is 11 g, and the amount of rosin glycerol ester used is 50 g.

[0065] Embodiment 17

[0066] The difference between this embodiment and embodiment 1 is that in the preparation of the liquid long-chain alkyl grafted rosin glycerol ester, the amount of long-chain alkyl silicone oil used is 15 g, and the amount of rosin glycerol ester used is 50 g.

[0067] Embodiment 18

[0068] The difference between this embodiment and embodiment 1 is that in the preparation of the liquid long-chain alkyl grafted rosin glycerol ester, the amount of the long-chain alkyl silicone oil used is 5 g, and the amount of the rosin glycerol ester used is 50 g.

[0069] Embodiment 19

[0070] The difference between this embodiment and embodiment 1 is that the plasticizer is composed of cyclohexane oil and dioctyl sebacate in a mass ratio of 1.5:1.

[0071] Embodiment 20

[0072] The difference between this embodiment and embodiment 1 is that the plasticizer is composed of cyclohexane oil and dioctyl sebacate in a mass ratio of 2.2:1.

[0073] Embodiment 21

[0074] The difference between this embodiment and embodiment 1 is that the plasticizer is composed of cyclohexane oil and dioctyl sebacate in a mass ratio of 1:1.

[0075] Embodiment 22

[0076] The difference between this embodiment and embodiment 1 is that the plasticizer is composed of cyclohexane oil and dioctyl sebacate in a mass ratio of 1:3.

[0077] Embodiment 23

[0078] The difference between this embodiment and embodiment 1 is that the plasticizer is cyclohexane oil.

[0079] Embodiment 24

[0080] The difference between this embodiment and embodiment 1 is that the plasticizer is dioctyl sebacate.

[0081] Comparative Example 1

[0082] The difference between this comparative example and Example 1 is that the diblock component content of the styrene-isoprene-styrene block polymer is 30%.

[0083] Comparative Example 2

[0084] The difference between this comparative example and Example 1 is that the diblock component content of the styrene-isoprene-styrene block polymer is 15%.

[0085] Comparative Example 3

[0086] The difference between this comparative example and Example 1 is that the tackifier is a terpene resin.

[0087] Comparative Example 4

[0088] The difference between this comparative example and Example 1 is that the tackifier is liquid rosin glycerol ester grafted with long-chain alkyl.

[0089] Comparative Example 5

[0090] The difference between this comparative example and Example 1 is that the tackifier is composed of terpene resin and rosin glycerol ester in a mass ratio of 2.6:1.

[0091] Comparative Example 6

[0092] The difference between this comparative example and Example 1 is that the tackifier is composed of terpene resin and liquid C5 petroleum resin in a mass ratio of 2.6:1.

[0093] Performance test method Sample preparation: Under -30°C, the hot melt pressure sensitive adhesives prepared in Examples 1-24 and Comparative Examples 1-6 were heated to complete melting to obtain adhesive solution; and the adhesive solution was coated on the BOPP film using an automatic coating machine, with an adhesive coating amount of 20 g / m 2 , and obtain the tape sample. ,

[0094] The initial adhesion of the sample was tested with reference to GB / T31125-2014 "Test method for initial adhesion of tape loops"; the persistent adhesion of the sample was tested with reference to GB / T4851-1984 "Test method for persistent adhesion of pressure-sensitive adhesive tapes"; the 180° peel strength of the sample was tested with reference to GB / T2792-1998 "Test method for 180° peel strength of pressure-sensitive adhesive tapes".

[0095] Table 2 Test data table

[0096]

[0097]

[0098] By analyzing the test results in Table 2, it can be seen that the hot melt pressure-sensitive adhesive prepared in the present application can still maintain a relatively excellent performance level in an extremely cold environment of -30°C. Specifically, the initial adhesion can reach more than 20N, the lasting adhesion can reach more than 50h, and the 180° peel strength can reach more than 20N / 2.5cm, which has high practical value.

[0099] Specifically, in combination with the test results of Example 1 and Example 6, the initial adhesion, sustained adhesion and 180° peel strength of the hot melt pressure sensitive adhesive in Example 6 are significantly reduced compared with those in Example 1. The reason may be that the long-chain alkyl silicone oil can provide long-chain alkyl groups compared with long-chain higher fatty acids, and its own characteristics further improve the wetting ability and bonding ability of the hot melt pressure sensitive adhesive in a low temperature environment; it may also be that the long-chain alkyl silicone oil interacts with other components in the system, further promoting the low-temperature bonding performance of the hot melt pressure sensitive adhesive to be better.

[0100] Specifically, in combination with the test results of Example 1 and Examples 15-18, the initial tack, initial tack and 180° peel strength of the hot melt pressure sensitive adhesive in Examples 15-16 are slightly lower than those in Example 1, while the initial tack, initial tack and 180° peel strength of the hot melt pressure sensitive adhesive in Examples 17-18 are significantly lower than those in Example 1. The reason may be that the amount of long-chain alkyl silicone oil added in Example 17 is too much, resulting in too low viscosity of the hot melt pressure sensitive adhesive system, which in turn affects the bonding performance. In Example 18, the amount of long-chain alkyl silicone oil added is too small, and the number of long-chain alkyl groups grafted onto the rosin glycerol ester is insufficient to improve the defects of the high softening point and high viscosity of the rosin glycerol ester.

[0101] Specifically, based on the test results of Example 1 and Examples 21-24, the combination of cyclohexane oil and dioctyl sebacate has a better effect as a plasticizer, and there is a certain synergistic effect between the two.

[0102] Specifically, in combination with the test results of Example 1 and Comparative Examples 1-2, the adhesive properties of the hot melt pressure-sensitive adhesives in Comparative Examples 1 and 2 are significantly inferior to those in Example 1. The reason may be that the diblock component content of the styrene-isoprene-styrene block polymer in Comparative Example 1 is too high, which leads to a negative effect with other components in the system, resulting in a decrease in performance. The diblock component content of the styrene-isoprene-styrene block polymer in Comparative Example 2 is too low, resulting in the reduction of the advantages of the styrene-isoprene-styrene block polymer itself, resulting in a decrease in performance.

[0103] Specifically, in combination with the test results of Example 1 and Comparative Examples 3-6, the initial adhesion of the hot melt pressure-sensitive adhesive in Comparative Example 3 decreased by about 13N, the sustained adhesion decreased by about 20h, and the 180° peel strength decreased by about 11N compared with that in Example 1, that is, the adhesive properties all decreased significantly. This is because a single terpene resin is prone to crystallization in a low temperature environment, which leads to a decrease in the adhesive properties of the hot melt pressure-sensitive adhesive. The addition of liquid grafted long-chain alkyl rosin glycerol ester can effectively overcome this defect, and the liquid grafted long-chain alkyl rosin glycerol ester itself also produces a good positive effect.

[0104] In Comparative Example 4, a single liquid rosin glycerol ester grafted with a long-chain alkyl group was used as a tackifier, and the bonding performance also showed a significant decrease. This is because there is a synergistic effect between the terpene resin and the liquid rosin glycerol ester grafted with a long-chain alkyl group, and the combined use effect is better.

[0105] The rosin glycerol ester in Comparative Example 5 is not grafted with a long-chain alkyl group. Due to the lack of a long-chain alkyl group, the defects of the rosin glycerol ester itself, such as high viscosity and high softening point, are not resolved, thus resulting in a decrease in performance.

[0106] In Comparative Example 6, an equal amount of liquid C5 petroleum resin was used to replace the liquid rosin glycerol ester grafted with long-chain alkyl groups. The bonding performance of the obtained hot-melt pressure-sensitive adhesive at low temperature was still lower than that of Example 1, thus indirectly verifying the positive role played by the liquid rosin glycerol ester grafted with long-chain alkyl groups in the system.

[0107] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed. However, as long as it is within the scope of the claims of the present application, it shall be protected by the patent law.

Claims

1. A low temperature resistant hot melt pressure sensitive adhesive, characterized in that: The hot melt pressure sensitive adhesive comprises the following raw materials in parts by weight: 50-70 parts of styrene-isoprene-styrene block polymer, 60-75 parts of tackifier, 20-30 parts of plasticizer, and 0.5-1 parts of antioxidant; the diblock component content of the styrene-isoprene-styrene block polymer is 20-25%; the tackifier is composed of terpene resin and liquid long-chain alkyl grafted rosin glycerol ester in a mass ratio of (2-3):1; The liquid long-chain alkyl grafted rosin glycerol ester is obtained by modifying the rosin glycerol ester with long-chain alkyl silicone oil; The preparation method of the liquid long-chain alkyl grafted rosin glycerol ester is as follows: Long-chain alkyl silicone oil is added to an organic solvent and heated to be completely dissolved under a nitrogen atmosphere, and then rosin glycerol ester and chloroplatinic acid-isopropanol solution are added in sequence, and a crude product is obtained after heating reaction; the crude product is successively extracted, distilled under reduced pressure, and dried to obtain liquid rosin glycerol ester grafted with a long-chain alkyl group.

2. A low temperature resistant hot melt pressure sensitive adhesive according to claim 1, characterized in that: The hot melt pressure-sensitive adhesive comprises the following raw materials in parts by weight: 60-65 parts of styrene-isoprene-styrene block polymer, 70-75 parts of tackifier, 22-25 parts of plasticizer, and 0.5-0.8 parts of antioxidant; the diblock component content of the styrene-isoprene-styrene block polymer is 23-25%; the tackifier is composed of terpene resin and liquid long-chain alkyl grafted rosin glycerol ester in a mass ratio of (2.3-2.8):

1.

3. A low temperature resistant hot melt pressure sensitive adhesive according to any one of claims 1 or 2, characterized in that: The styrene content of the styrene-isoprene-styrene block polymer is 15-20%.

4. The low temperature resistant hot melt pressure sensitive adhesive according to claim 1, characterized in that: The mass of the long-chain alkyl silicone oil accounts for 17-22% of the mass of rosin glycerol ester.

5. The low temperature resistant hot melt pressure sensitive adhesive according to claim 1, characterized in that: The reaction temperature is 95-105°C and the reaction time is 8-12h.

6. The low temperature resistant hot melt pressure sensitive adhesive according to claim 1, characterized in that: The plasticizer is composed of cyclohexane oil and dioctyl sebacate in a mass ratio of (1.5-2.2):

1.

7. The low temperature resistant hot melt pressure sensitive adhesive according to claim 1, characterized in that: The antioxidant includes at least one of antioxidant 1010 , 2,6-di-tert-butyl-p-cresol, and antioxidant 168 .

8. A method for preparing a low temperature resistant hot melt pressure sensitive adhesive according to any one of claims 1 to 7, characterized in that: The preparation method comprises the following steps: Heat the plasticizer and antioxidant in a nitrogen atmosphere until the temperature reaches 100°C-105°C, add the tackifier and heat until it melts, then add the styrene-isoprene-styrene block polymer, continue to heat to 120-130°C until the polymer is completely melted, and obtain the hot melt pressure-sensitive adhesive after cooling.

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