A self-adhesive TPO waterproof membrane hot melt adhesive and its preparation method

Abstract

This invention discloses a self-adhesive TPO waterproof membrane hot melt adhesive and its preparation method. The self-adhesive TPO waterproof membrane hot melt adhesive comprises the following components in parts by weight: 15-40 parts of thermoplastic elastomer, 5-15 parts of rubber oil, 10-30 parts of polyisobutylene, 5-25 parts of solution-polymerized styrene-butadiene rubber, 30-50 parts of tackifying resin, and 1-5 parts of antioxidant; wherein the thermoplastic elastomer is composed of star-shaped SIS and star-shaped SBS in a mass ratio of (0.5-4):1; the rubber oil has a solubility parameter of 15.45±3.07 (J / cm³). 3 ) 1 / 2 The hot melt adhesive of this invention retains high peel strength after heat aging and exhibits good adhesion to TPO waterproof membranes, meaning it does not lose its adhesion even after heat aging.

Description

Technical Field

[0001] This invention relates to the field of hot melt adhesive technology, and in particular to a self-adhesive TPO waterproof membrane hot melt adhesive and its preparation method. Background Technology

[0002] Since the publication of GB1873.1-2012 "Polymer Waterproof Membranes" and GB / T23260-2009 "Waterproof Membranes with Self-Adhesive Layers," polymer self-adhesive membranes have been widely used. Traditional polymer waterproof membranes include HDPE, EPDM, and PVC. Recently, due to the excellent weather resistance and weldability of TPO, it has been widely promoted and applied in self-adhesive membranes. The self-adhesive layer of traditional self-adhesive membranes mainly consists of hot melt adhesives with SIS, SBS, low molecular weight rubber oil, and tackifying resins as the main materials, with some anti-aging additives added. When this type of hot melt adhesive is applied to TPO membranes, it has good compatibility with TPO. However, after heat aging, the self-adhesive layer will lose its adhesion and will not be able to bond with aluminum plates, cement blocks, or TPO membranes.

[0003] Existing technologies include hot melt adhesives that do not lose tack after heat aging, such as publication number CN109054688A, entitled "Hot Melt Pressure Sensitive Adhesive That Does Not Lose Tack After Heat Aging and Its Preparation Method." The main materials are butyl rubber, SEBS, SEPS, and hydrogenated resin. This technology mainly utilizes the fact that the materials have no unsaturated bonds and have good aging resistance to maintain the adhesive performance after heat aging. However, since the main material, butyl rubber, has flexible segments, it cannot prevent the plasticizer from migrating to the roll layer, especially under heating conditions, which will accelerate the migration and cause the self-adhesive layer to lose tack. Furthermore, butyl rubber has a large molecular weight, which cannot be used with existing coating equipment and requires new coating equipment. The coating efficiency is low, and high-temperature melting is required, resulting in high production costs.

[0004] Therefore, there is an urgent need to develop a hot melt adhesive that can withstand the heat aging of TPO rolls without losing its tack. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, one of the objectives of this invention is to provide a self-adhesive hot melt adhesive for TPO waterproof membranes. This hot melt adhesive retains high peel strength even after heat aging and exhibits good adhesion to TPO waterproof membranes, meaning it does not lose its adhesiveness after heat aging.

[0006] The second objective of this invention is to provide a method for preparing a hot melt adhesive for self-adhesive TPO waterproof membrane.

[0007] One of the objectives of this invention is achieved by the following technical solution: a self-adhesive TPO waterproof membrane hot melt adhesive, comprising the following components by weight: 15-40 parts of thermoplastic elastomer, 5-15 parts of rubber oil, 10-30 parts of polyisobutylene, 5-25 parts of solution-polymerized styrene-butadiene rubber, 30-50 parts of tackifying resin, and 1-5 parts of antioxidant.

[0008] The thermoplastic elastomer is composed of star-shaped SIS (styrene-isoprene-styrene) and star-shaped SBS (styrene-butadiene-styrene) in a mass ratio of (0.5-4):1.

[0009] The solubility parameter of the rubber oil is 15.45 ± 3.07 (J / cm³). 3 ) 1 / 2 Rubber oil.

[0010] Furthermore, the star-shaped SIS is selected from one or a mixture of two or more of the star-shaped SIS of Yueyang Petrochemical (China) with grade 4016, the star-shaped SIS of DEXCO (USA) with grade 4186A, and the star-shaped SIS of DEXCO (USA) with grade 4187A; the star-shaped SBS is selected from one or a mixture of two or more of the star-shaped SBS of Shandong Jusheng (China) with grade 4412, the star-shaped SBS of Shandong Jusheng (China) with grade 4452, and the star-shaped SBS of DEXCO (USA) with grade 2336.

[0011] Furthermore, the rubber oil is selected from naphthenic oil with grade 47135 from Karamay, Xinjiang, China; naphthenic oil with grade 4010 from Karamay, Xinjiang, China; and naphthenic rubber oil with grade KN4100 from Kunlun, China.

[0012] Furthermore, the molecular weight of the polyisobutylene is controlled between 950 and 2400.

[0013] Furthermore, the solution-polymerized styrene-butadiene rubber is selected from Dynaso's 1205 grade solution-polymerized styrene-butadiene rubber or Yueyang Petrochemical's 2605 grade solution-polymerized styrene-butadiene rubber.

[0014] Furthermore, the tackifying resin is selected from one or a mixture of two or more of petroleum resin, rosin resin, and terpene resin.

[0015] Furthermore, the antioxidant is selected from one or more of BASF's antioxidants with the designations 1010 and 168.

[0016] The second objective of this invention is achieved by the following technical solution: a method for preparing a self-adhesive TPO waterproof membrane hot melt adhesive, comprising the following steps:

[0017] (1) Add the formulated amount of rubber oil and antioxidant to the mixing tank and heat to 120-130℃;

[0018] (2) Then add the thermoplastic elastomer and solution-polymerized styrene-butadiene rubber in the formula amount, heat and stir for 35-45 minutes, and control the temperature at 155-160℃;

[0019] (3) Then add the tackifying resin and polyisobutylene in the formula, stir under vacuum for 40-50 minutes, keep the temperature at 145-155℃, discharge the material, cool and form to obtain self-adhesive TPO waterproof membrane hot melt adhesive.

[0020] Furthermore, in the preparation method of the self-adhesive TPO waterproof membrane hot melt adhesive, the formulation of the self-adhesive TPO waterproof membrane hot melt adhesive is as follows by weight parts: 15-40 parts of thermoplastic elastomer, 5-15 parts of rubber oil, 10-30 parts of polyisobutylene, 5-25 parts of solution-polymerized styrene-butadiene rubber, 30-50 parts of tackifying resin, and 1-5 parts of antioxidant.

[0021] Furthermore, in the preparation method of the self-adhesive TPO waterproof membrane hot melt adhesive, the thermoplastic elastomer is composed of star-shaped SIS (styrene-isoprene-styrene) and star-shaped SBS (styrene-butadiene-styrene) with a mass ratio of (0.5-4):1.

[0022] The solubility parameter of the rubber oil is 15.45 ± 3.07 (J / cm³). 3 ) 1 / 2 Rubber oil;

[0023] The molecular weight of the polyisobutylene is controlled between 950 and 2400;

[0024] The solution-polymerized styrene-butadiene rubber is selected from Dynaso's 1205 grade solution-polymerized styrene-butadiene rubber or Yueyang Petrochemical's 2605 grade solution-polymerized styrene-butadiene rubber.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] The hot melt adhesive of this invention still has high peel strength after heat aging and good adhesion to TPO waterproof membrane, that is, it has the effect of not losing adhesion after heat aging. This invention specifically selects a star-shaped thermoplastic elastomer as the matrix material for the hot melt adhesive. Because the star structure has a divergent network space, the amount of low-molecular-weight rubber oil used is reduced, and a higher-molecular-weight polyisobutylene is used as the plasticizer. For the low-molecular-weight rubber oil, a rubber oil with a solubility parameter similar to that of polyisoprene and polybutadiene is selected, preferably with a solubility parameter of 15.45±3.07 (J / cm3)1 / 2. This rubber oil has a stronger binding force with the soft satin phase domains of the SBC styrene block copolymer (star-shaped SIS + star-shaped SBS) selected in this invention, making it easier to enter the SBC polystyrene phase domains. This increases the diameter of the polymer's "sponge-like" network, increasing the space for accommodating the low-molecular-weight plasticizer rubber oil. The entire system increases the resistance to the migration of rubber oil to the hot melt adhesive surface, preventing the rubber oil from being squeezed out at high temperatures, thereby maintaining the adhesive strength of the hot melt adhesive during heat aging. Detailed Implementation

[0027] The present invention will now be further described in conjunction with specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0028] In this invention, unless otherwise specified, all parts and percentages are by weight, and the equipment and raw materials used are commercially available or commonly used in the art. Unless otherwise specified, the methods in the following embodiments are conventional methods in the art.

[0029] This invention provides a self-adhesive TPO waterproof membrane hot melt adhesive, comprising the following components by weight: 15-40 parts of thermoplastic elastomer, 5-15 parts of rubber oil, 10-30 parts of polyisobutylene, 5-25 parts of solution-polymerized styrene-butadiene rubber, 30-50 parts of tackifying resin, and 1-5 parts of antioxidant.

[0030] The thermoplastic elastomer is composed of star-shaped SIS (styrene-isoprene-styrene) and star-shaped SBS (styrene-butadiene-styrene) in a mass ratio of (0.5-4):1.

[0031] The solubility parameter of the rubber oil is 15.45 ± 3.07 (J / cm³). 3 ) 1 / 2 Rubber oil.

[0032] This invention selects a star-shaped thermoplastic elastomer as the matrix material for the hot melt adhesive. The star-shaped structure has a divergent network space. Then, the amount of low molecular weight rubber oil used is reduced, and higher molecular weight polyisobutylene is used as a plasticizer. For the low molecular weight rubber oil, a rubber oil with a solubility parameter similar to that of polyisoprene and polybutadiene is selected, preferably with a solubility parameter of 15.45 ± 3.07 (J / cm³). 3 ) 1 / 2 It has a stronger binding force with the soft satin phase domains of the SBC styrene block copolymer (star-shaped SIS + star-shaped SBS) selected in this invention, and is more likely to enter the SBC polystyrene phase domains, increasing the diameter of the polymer "sponge-like" mesh, increasing the space for accommodating small molecule plasticizer rubber oil, and increasing the resistance of the rubber oil to migration to the hot melt adhesive surface in the entire system, so that the rubber oil is not squeezed out at high temperature, thereby maintaining the adhesion of the hot melt adhesive during heat aging.

[0033] Solution-polymerized styrene-butadiene rubber (SBR) has 100% diblock composition. After absorbing rubber oil, it swells and partially crosslinks with star-shaped SIS and star-shaped SBS at high temperatures, forming larger hot melt adhesive network molecules. This further increases the resistance of the hot melt adhesive to rubber oil migration, thereby maintaining the adhesive strength of the hot melt adhesive after heat aging.

[0034] As a further preferred embodiment, the star-shaped SIS is selected from one or a mixture of two or more of the following: star-shaped SIS of Yueyang Petrochemical (China) grade 4016, star-shaped SIS of DEXCO (USA) grade 4186A, and star-shaped SIS of DEXCO (USA) grade 4187A; the star-shaped SBS is selected from one or a mixture of two or more of the following: star-shaped SBS of Shandong Jusheng (China) grade 4412, Shandong Jusheng (China) grade 4452, and star-shaped SBS of DEXCO (USA) grade 2336.

[0035] As a further preferred option, the rubber oil is selected from naphthenic oil of grade 47135 from Karamay, Xinjiang, China; naphthenic oil of grade 4010 from Karamay, Xinjiang, China; and naphthenic rubber oil of grade KN4100 from Kunlun, China.

[0036] The solubility parameter of the rubber oil selected in this application is 15.45 (J / cm³). 3 ) 1 / 2 The solubility parameter of polyisoprene domains in the star-shaped SIS is approximately 17.3 (J / cm²). 3 ) 1 / 2 The solubility parameter of polybutadiene domains in the star-shaped SIS is 17.1 (J / cm³). 3 ) 1 / 2 The closer the solubility parameters of the two are, the better their compatibility. When the solubility parameters differ by 3.07 (J / cm³), the better the compatibility. 3 ) 1 / 2 The polymer is incompatible with the solvent.

[0037] As a further preferred embodiment, the molecular weight of the polyisobutylene is controlled between 950 and 2400.

[0038] In addition, this application selects polyisobutylene with a large molecular weight, large molecular cross-sectional area, and low molecular chain flexibility, which further increases the resistance to the migration of rubber oil to the surface of hot melt adhesive, thereby improving the heat resistance of the adhesive. Furthermore, polyisobutylene itself has initial tack, which can improve the adhesion of hot melt adhesive to TPO waterproof membrane and building structure.

[0039] As a further preferred option, the solution-polymerized styrene-butadiene rubber is selected from Dynaso's 1205 grade solution-polymerized styrene-butadiene rubber or Yueyang Petrochemical's 2605 grade solution-polymerized styrene-butadiene rubber.

[0040] As a further preferred embodiment, the tackifying resin is selected from one or a mixture of two or more of petroleum resin, rosin resin, and terpene resin.

[0041] As a further embodiment, the antioxidant is selected from one or more of BASF's antioxidants with the brand names 1010 and 168.

[0042] The present invention also provides a method for preparing the above-mentioned self-adhesive TPO waterproof membrane hot melt adhesive, comprising the following steps:

[0043] (1) Add the formulated amount of rubber oil and antioxidant to the mixing tank and heat to 120-130℃;

[0044] (2) Then add the thermoplastic elastomer and solution-polymerized styrene-butadiene rubber in the formula amount, heat and stir for 35-45 minutes, and control the temperature at 155-160℃;

[0045] (3) Then add the tackifying resin and polyisobutylene in the formula, stir under vacuum for 40-50 minutes, keep the temperature at 145-155℃, discharge the material, cool and form to obtain self-adhesive TPO waterproof membrane hot melt adhesive.

[0046] The following are specific embodiments of the present invention. Unless otherwise specified, the raw materials, equipment and other materials used in the following embodiments can be obtained by purchasing.

[0047] Examples 1-4 and Comparative Examples 1-15

[0048] Weigh the raw materials according to the proportions in Table 1, and prepare the hot melt adhesive according to the preparation method in Table 1 to obtain hot melt adhesives for different embodiments. See Table 1 for details:

[0049] Table 1. Raw material ratios for Examples 1-4 and Comparative Examples 1-14

[0050]

[0051] In Table 1, the star-shaped SIS in Examples 1-4 was selected from DEXCO's 4186A star-shaped SIS, and the star-shaped SBS was selected from DEXCO's 2336 star-shaped SBS. The mass ratio of star-shaped SIS to star-shaped SBS in Example 1 was 3:1, in Example 2 it was 2:1, in Example 3 it was 1:1, and in Example 4 it was 0.5:1. The rubber oil in Examples 1-4 was selected from Kunlun's KN4100 naphthenic rubber oil, with a solubility parameter of 15.45 (J / cm³). 3 ) 1 / 2 The molecular weight of polyisobutylene is 1400. The solution-polymerized styrene-butadiene rubber is selected from Dynasol's 1205 grade solution-polymerized styrene-butadiene rubber from Spain. The tackifying resin is selected from rosin resin, and the antioxidant is selected from BASF's 1010 antioxidant.

[0052] Comparative Example 1

[0053] The difference from Example 1 is that the thermoplastic elastomer is missing, but the remaining steps, conditions and reagent formulations are basically the same as in Example 1.

[0054] Comparative Example 2

[0055] The difference from Example 1 is that no rubber oil plasticizer is added, and the amount of polyisobutylene plasticizer is 29 parts. The remaining steps, conditions and reagent formulations are basically the same as those in Example 1.

[0056] Comparative Example 3

[0057] The difference from Example 1 is that polyisobutylene plasticizer is not added, and the amount of rubber oil plasticizer is 29 parts. The remaining steps, conditions and reagent formulations are basically the same as those in Example 1.

[0058] Comparative Example 4

[0059] The difference from Example 1 is that solution-polymerized styrene-butadiene rubber is not added, and the amount of thermoplastic elastomer used is 30 parts. The remaining steps, conditions and reagent formulations are basically the same as those in Example 1.

[0060] Comparative Example 5

[0061] The difference from Example 1 is that the thermoplastic elastomer used is composed of linear SIS and linear SBS in a mass ratio of 3:1. The remaining steps, conditions and reagent formulations are basically the same as those in Example 1.

[0062] The linear structure SIS was selected from SIS grade 1716 from Yueyang Petrochemical Company in China, and the linear structure SBS was selected from SBS grade 1201 from Shandong Jusheng Technology Company in China.

[0063] Comparative Example 6

[0064] The difference from Example 1 is that the thermoplastic elastomer used is composed of star-shaped SIS and star-shaped SBS in a mass ratio of 5:1. The remaining steps, conditions and reagent formulations are basically the same as those in Example 1.

[0065] Comparative Example 7

[0066] The difference from Example 1 is that the thermoplastic elastomer used is composed of star-shaped SIS and star-shaped SBS in a mass ratio of 0.25:1. The remaining steps, conditions and reagent formulations are basically the same as in Example 1.

[0067] Comparative Example 8

[0068] The difference from Example 1 is that the thermoplastic elastomer used is composed of a single star-shaped SIS structure, while the remaining steps, conditions and reagent formulations are basically the same as in Example 1.

[0069] Comparative Example 9

[0070] The difference from Example 1 is that the thermoplastic elastomer used is composed of a single star-shaped SBS structure, while the remaining steps, conditions and reagent formulations are basically the same as in Example 1.

[0071] Comparative Example 10

[0072] The difference from Example 1 is that the thermoplastic elastomer used is composed of SEBS and SEPS in a mass ratio of 3:1, while the remaining steps, conditions and reagent formulations are basically the same as in Example 1.

[0073] SEBS was selected from SEBS grade 501T from Yueyang Petrochemical Company in China, and SEPS was selected from SEPS grade 1701 from Kraton Company.

[0074] Comparative Example 11

[0075] The difference from Example 1 is that the solubility parameter of the rubber oil used is 20.23 (J / cm³). 3 ) 1 / 2 The remaining steps, conditions, and reagent formulations are basically the same as in Example 1.

[0076] Comparative Example 12

[0077] The difference from Example 1 is that the solubility parameter of the rubber oil used is 11.63 (J / cm³). 3 ) 1 / 2 The remaining steps, conditions, and reagent formulations are basically the same as in Example 1.

[0078] Comparative Example 13

[0079] The difference from Example 1 is that the molecular weight of the polyisobutylene used is 3500, while the remaining steps, conditions and reagent formulations are basically the same as in Example 1.

[0080] Comparative Example 14

[0081] The difference from Example 1 is that the molecular weight of the polyisobutylene used is 400, while the remaining steps, conditions and reagent formulations are basically the same as in Example 1.

[0082] Comparative Example 15

[0083] The hot melt adhesive was prepared according to the formula and preparation method described in Example 3 of the patent specification, which is an existing patented product, namely the invention titled "Heat-Aging Non-Loss Hot Melt Pressure-Sensitive Adhesive" in Chinese Patent Publication No. CN109054688A.

[0084] The preparation methods of hot melt adhesives in Examples 1-4 and Comparative Examples 1-14 include the following steps:

[0085] (1) Add the formulated amount of rubber oil and antioxidant to the mixing tank and heat to 120-130℃;

[0086] (2) Then add the thermoplastic elastomer and solution-polymerized styrene-butadiene rubber in the formula amount, heat and stir for 35-45 minutes, and control the temperature at 155-160℃;

[0087] (3) Then add the tackifying resin and polyisobutylene in the formula, stir under vacuum for 40-50 minutes, keep the temperature at 145-155℃, discharge the material, cool and form to obtain self-adhesive TPO waterproof membrane hot melt adhesive.

[0088] Effect evaluation and performance testing

[0089] 1. The performance of the hot melt adhesives in Examples 1-4 and Comparative Examples 1-15 was tested in accordance with the national standard GB / T 23260-2009. The test items and results are shown in Table 2.

[0090] Table 2 shows the hot melt adhesive performance test data for each example.

[0091]

[0092]

[0093] As shown in the table above, the hot melt adhesives prepared in Examples 1-4 utilize star-shaped SIS and star-shaped SBS thermoplastic elastomers, reducing the amount of low molecular weight rubber oil and increasing the amount of high molecular weight polyisobutylene plasticizer. Furthermore, rubber oils with solubility parameters similar to polyisoprene and polybutadiene are introduced. This increases the resistance to the migration of rubber oil to the hot melt adhesive surface, thereby maintaining the adhesive strength after heat aging and achieving good miscibility. The hot melt adhesive of this invention, when applied to TPO waterproof membranes with self-adhesive layers, exhibits advantages such as no decrease in adhesive peel strength after heat aging and low cost.

[0094] Compared to Example 1, Comparative Example 1 lacks an elastomer, resulting in a lack of an elastic "skeleton" in the hot melt adhesive. The hot melt adhesive lacks elastic modulus, has virtually no pressure sensitivity, and lacks adhesiveness. Comparative Example 2 lacks low-molecular-weight rubber oil, leading to an excessively large molecular weight in the hot melt adhesive, making processing difficult and preventing the polymer from fully dissolving, thus reducing adhesive strength. Comparative Example 3 lacks the high-molecular-weight plasticizer polyisobutylene, consisting entirely of rubber oil. At high temperatures, this increases the migration of rubber oil to the roll layer, causing a sharp decrease in adhesion. Comparative Example 4 lacks solution-polymerized styrene-butadiene rubber, resulting in a smaller hot melt adhesive molecular network space, reducing the amount of small-molecule plasticizer it can accommodate. This causes the plasticizer to migrate to the roll layer, resulting in a sharp decrease in the self-adhesive layer's adhesion.

[0095] Compared with Example 1, the hot melt adhesive formulation of Comparative Example 5 differs in that the thermoplastic elastomer used is composed of linear SIS and linear SBS in a mass ratio of 3:1. Since Comparative Example 5 does not have a star-shaped polymer, the hot melt adhesive network space becomes "narrower". During heat aging, the plasticizer is more likely to migrate to the roll layer, resulting in a decrease in the self-adhesive layer adhesion.

[0096] Compared with Example 1, the difference in the hot melt adhesive formulations of Comparative Examples 6-7 lies in the fact that the mass ratio of star-shaped SIS and SBS in the thermoplastic elastomers used is not within the range of this case. In Comparative Example 6, the amount of star-shaped SIS is too large. Since the cohesive strength of SIS is lower than that of SBS, the cohesive strength of the adhesive is low, resulting in a decrease in the overall bond strength. In Comparative Example 7, the amount of star-shaped SBS is too large, resulting in a relatively large overall cohesive strength of the adhesive and a low initial tack, which leads to a low bond strength.

[0097] Compared with Example 1, the difference in the hot melt adhesive formulations of Comparative Examples 8-9 lies in the use of a single star-shaped SIS or a single star-shaped SBS in the thermoplastic elastomer. In Comparative Example 8, which only uses star-shaped SIS, the hot melt adhesive has insufficient elastic modulus, low cohesion, and low bonding strength. Due to the absence of SBS, the hot melt adhesive cannot undergo partial cross-linking at high temperatures, the molecular network cannot increase, and the plasticizer migrates to the roll layer during heat aging, resulting in a decrease in the self-adhesive layer bonding strength. In Comparative Example 9, which only uses a single star-shaped SBS, the star-shaped SBS has high cohesion and high elastic modulus, resulting in poor pressure sensitivity and poor bonding effect.

[0098] Compared with Example 1, the hot melt adhesive formulation of Comparative Example 10 differs in that the thermoplastic elastomer used is composed of SEBS and SEPS in a mass ratio of 3:1. Due to the high oil filling rate of SEBS and SEPS, Comparative Example 10 produces a hot melt adhesive with a high elastic modulus, low pressure sensitivity, and weak adhesion.

[0099] Compared with Example 1, the hot melt adhesive formulation of Comparative Examples 11-12 differs in that the solubility parameters of the rubber oil used are not within the solubility parameter range of the rubber oil selected in this case. Since the solubility parameters of Comparative Examples 11-12 are significantly different from those of SIS and SBS, they do not have adhesive properties.

[0100] Compared with Example 1, the difference in the hot melt adhesive formulation of Comparative Examples 13-14 is that the molecular weight of the polyisobutylene used is not within the range of the molecular weight selected in this case. Comparative Example 13 uses polyisobutylene with a larger molecular weight, which has poor compatibility with the main rubber, resulting in poor viscoelasticity and low peel strength. Comparative Example 14 uses polyisobutylene with a low molecular weight. During heat aging, the molecular cross-section is small and it is easy to migrate to the roll layer, causing a decrease in peel strength after heat aging.

[0101] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A self-adhesive TPO waterproof membrane hot melt adhesive, characterized in that, It includes the following components by weight: 15-40 parts thermoplastic elastomer, 5-15 parts rubber oil, 10-30 parts polyisobutylene, 5-25 parts solution-polymerized styrene-butadiene rubber, 30-50 parts tackifying resin, and 1-5 parts antioxidant. The thermoplastic elastomer is composed of star-shaped SIS and star-shaped SBS in a mass ratio of (0.5-4):

1. The solubility parameter of the rubber oil is 15.45 ± 3.07 (J / cm³). 3 ) 1 / 2 Rubber oil.

2. The self-adhesive TPO waterproof membrane hot melt adhesive as described in claim 1, characterized in that, The star-shaped SIS is selected from one or a mixture of two or more of the following: star-shaped SIS of Yueyang Petrochemical (China) with grade 4016, star-shaped SIS of DEXCO (USA) with grade 4186A, and star-shaped SIS of DEXCO (USA) with grade 4187A; the star-shaped SBS is selected from one or a mixture of two or more of the following: star-shaped SBS of Shandong Jusheng (China) with grade 4412, Shandong Jusheng (China) with grade 4452, and star-shaped SBS of DEXCO (USA) with grade 2336.

3. The self-adhesive TPO waterproof membrane hot melt adhesive as described in claim 1, characterized in that, The rubber oil is selected from naphthenic oil with grade 47135 from Karamay, Xinjiang, China; naphthenic oil with grade 4010 from Karamay, Xinjiang, China; and naphthenic rubber oil with grade KN4100 from Kunlun, China.

4. The self-adhesive TPO waterproof membrane hot melt adhesive as described in claim 1, characterized in that, The molecular weight of the polyisobutylene is controlled between 950 and 2400.

5. The self-adhesive TPO waterproof membrane hot melt adhesive as described in claim 1, characterized in that, The solution-polymerized styrene-butadiene rubber is selected from Dynaso's 1205 grade solution-polymerized styrene-butadiene rubber or Yueyang Petrochemical's 2605 grade solution-polymerized styrene-butadiene rubber.

6. The self-adhesive TPO waterproof membrane hot melt adhesive as described in claim 1, characterized in that, The tackifying resin is selected from one or a mixture of two or more of petroleum resin, rosin resin, and terpene resin.

7. The self-adhesive TPO waterproof membrane hot melt adhesive as described in claim 1, characterized in that, The antioxidant is selected from one or more of BASF's antioxidants with the brand names 1010 and 168.

8. A method for preparing a self-adhesive TPO waterproof membrane hot melt adhesive as described in any one of claims 1-7, characterized in that, Includes the following steps: (1) Add the formulated amount of rubber oil and antioxidant to the mixing tank and heat to 120-130℃; (2) Then add the thermoplastic elastomer and solution-polymerized styrene-butadiene rubber in the formula amount, heat and stir for 35-45 minutes, and control the temperature at 155-160℃; (3) Then add the tackifying resin and polyisobutylene in the formula, stir under vacuum for 40-50 minutes, keep the temperature at 145-155℃, discharge the material, cool and form to obtain self-adhesive TPO waterproof membrane hot melt adhesive.

9. The method for preparing the self-adhesive TPO waterproof membrane hot melt adhesive as described in claim 8, characterized in that, The molecular weight of the polyisobutylene is controlled between 950 and 2400; The solution-polymerized styrene-butadiene rubber is selected from Dynaso's 1205 grade solution-polymerized styrene-butadiene rubber or Yueyang Petrochemical's 2605 grade solution-polymerized styrene-butadiene rubber.

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