Hot melt adhesive for waterproof roll and preparation method thereof

Abstract

The present invention discloses a hot melt adhesive for waterproofing membranes and a preparation method thereof. The hot melt adhesive contains butyl reclaimed rubber, butyl reclaimed rubber, a polyamide thermoplastic elastomer, and a SEBS thermoplastic elastomer. The present invention uses discarded butyl reclaimed rubber as one of the raw materials for the hot melt adhesive, significantly reducing production costs. Furthermore, to prevent the effects of impurities in the butyl reclaimed rubber on the performance of the hot melt adhesive, which could reduce its effectiveness, and to enhance the hot melt adhesive's performance for waterproofing membranes, bromobutyl rubber, a polyamide thermoplastic elastomer, and a SEBS thermoplastic elastomer are simultaneously introduced to improve the hot melt adhesive's physical strength (primarily enhancing toughness, tensile strength, wear resistance, and noise reduction), vibration resistance, permeability, heat and weather aging resistance (down to -40°C), and viscosity. A separate mixing process is used to ensure that the materials, when compatible, do not deteriorate due to differences in melting temperatures, thereby ensuring the effectiveness of the hot melt adhesive.

Description

Technical Field

[0001] The present invention relates to the technical field of hot melt adhesives for waterproof coiled materials, in particular to a hot melt adhesive for waterproof coiled materials and a preparation method thereof. Background Art

[0002] Waterproof membranes are mainly used in building walls, roofs, tunnels, roads, landfills and other places. It is a flexible building material product with a certain degree of curling, mainly used to resist the leakage of external rainwater and groundwater. As a leak-proof connection between the project foundation and the building, it is the first barrier to waterproofing the entire project and plays a vital role in the entire project. The waterproof material product made by impregnating asphalt or polymer waterproof materials on the carcass is provided in the form of a roll and is called waterproof membrane. Waterproof membranes are required to have good water resistance, stability to temperature changes (no flowing, bubbling, or shaking at high temperatures, and no brittle cracking at low temperatures), certain mechanical strength, elongation and fracture resistance, and certain flexibility and aging resistance.

[0003] For example, the technical solution proposed in the Chinese invention patent application number CN201710140523.X, titled "Hot Melt Adhesive for Waterproof Membrane and Preparation Method thereof," primarily improves the hot melt adhesive's initial adhesion, cold resistance, thermal stability, and bonding strength, reduces its volatility, and particularly enhances its adhesion to humid building environments such as cement, concrete, and sand. However, this hot melt adhesive differs from the present application in the following ways: higher cost, lower toughness, poorer tensile strength, and insufficient weather resistance (aging resistance). Summary of the Invention

[0004] The purpose of the present invention is to provide a hot melt adhesive for waterproof roll and its preparation method, so as to solve the problems of high cost, low toughness, poor tensile performance and insufficient weather resistance (anti-aging) of existing hot melt adhesives for waterproof roll.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A hot melt adhesive for waterproofing membranes is prepared from the following raw materials: 70-80 parts of butyl reclaimed rubber, 20-25 parts of bromobutyl rubber, 15-20 parts of polyamide thermoplastic elastomer, 15-20 parts of SEBS thermoplastic elastomer, 10-15 parts of cycloalkyl rubber oil, 10-12 parts of polyisobutylene, 8-10 parts of petroleum resin, 4-6 parts of petroleum asphalt, 1-3 parts of EVA resin, and 1-2 parts of additives.

[0007] A further technical solution is: 80 parts of butyl reclaimed rubber, 20 parts of brominated butyl rubber, 18 parts of polyamide thermoplastic elastomer, 18 parts of SEBS thermoplastic elastomer, 12 parts of cycloalkyl rubber oil, 10 parts of polyisobutylene, 8 parts of petroleum resin, 6 parts of petroleum asphalt, 3 parts of EVA resin, and 2 parts of additives.

[0008] A further technical solution is that the additives are plasticizers, fillers, vulcanization aids, vulcanization accelerators, deodorizers, and antioxidants.

[0009] A method for preparing a hot melt adhesive for a waterproof roll, characterized in that the preparation method comprises:

[0010] S1. Put butyl reclaimed rubber, bromobutyl rubber and 1 / 2 of cycloalkyl rubber oil into an internal mixer and melt them completely to obtain material A;

[0011] S2. Put polyamide thermoplastic elastomer, SEBS thermoplastic elastomer and 1 / 2 of cycloalkyl rubber oil into an internal mixer and obtain material B after they are completely melted;

[0012] S3. Add material A, material B, polyisobutylene, petroleum resin, petroleum asphalt, EVA resin and additives into a vacuum reactor for stirring and mixing, and obtain the hot melt adhesive after cooling.

[0013] A further technical solution is: the operating temperature of the cavity of the internal mixer in S1 is 130-140°C, and the discharge temperature is lower than 50-95°C.

[0014] A further technical solution is: the cavity operating temperature of the internal mixer in S2 is lower than 149-270°C, and the discharge temperature is lower than 50-95°C.

[0015] A further technical solution is: the working conditions of the vacuum reactor are 50-95° C. and the vacuum degree is less than -0.016.

[0016] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0017] The present invention uses waste butyl reclaimed rubber as one of the raw materials for the hot melt adhesive, greatly reducing production costs. Furthermore, to avoid the effects of impurities in the butyl reclaimed rubber, which can reduce its performance, and to improve the performance of the hot melt adhesive for waterproofing membranes, brominated butyl rubber, polyamide thermoplastic elastomer, and SEBS thermoplastic elastomer are introduced to enhance the hot melt adhesive's physical strength (primarily improving toughness, tensile strength, wear resistance, and sound absorption), vibration resistance, permeability, heat and weather aging resistance (down to -40°C), and viscosity.

[0018] Moreover, the introduced SEBS thermoplastic elastomer has good compatibility with other materials and can be used as a compatibilizer to increase the softening temperature of the material and reduce production difficulty. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0020] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0021] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other.

[0022] Example 1:

[0023] A hot melt adhesive for waterproofing membranes is prepared according to a method for preparing the hot melt adhesive. The hot melt adhesive is made from the following raw materials: 80 parts of butyl reclaimed rubber, 20 parts of bromobutyl rubber, 18 parts of polyamide thermoplastic elastomer, 18 parts of SEBS thermoplastic elastomer, 12 parts of cycloalkyl rubber oil, 10 parts of polyisobutylene, 8 parts of petroleum resin, 6 parts of petroleum asphalt, 3 parts of EVA resin, and 2 parts of additives. The additives include a plasticizer, a filler, a vulcanization aid, a vulcanization accelerator, a deodorizer, and an antioxidant.

[0024] Example 2:

[0025] Based on the preparation method of the hot melt adhesive used in this waterproof membrane, the hot melt adhesive is made from the following raw materials: 70 parts of butyl reclaimed rubber, 25 parts of bromobutyl rubber, 18 parts of polyamide thermoplastic elastomer, 18 parts of SEBS thermoplastic elastomer, 12 parts of cycloalkyl rubber oil, 10 parts of polyisobutylene, 8 parts of petroleum resin, 6 parts of petroleum asphalt, 3 parts of EVA resin, and 2 parts of additives. The additives include plasticizers, fillers, vulcanization aids, vulcanization accelerators, deodorizers, and antioxidants.

[0026] Example 3:

[0027] Based on the preparation method of the hot melt adhesive used in this waterproof membrane, the hot melt adhesive is made from the following raw materials: 80 parts of butyl reclaimed rubber, 20 parts of bromobutyl rubber, 20 parts of polyamide thermoplastic elastomer, 20 parts of SEBS thermoplastic elastomer, 15 parts of cycloalkyl rubber oil, 10 parts of polyisobutylene, 8 parts of petroleum resin, 6 parts of petroleum asphalt, 3 parts of EVA resin, and 2 parts of additives. The additives include plasticizers, fillers, vulcanization aids, vulcanization accelerators, deodorizers, and antioxidants.

[0028] Example 4:

[0029] Based on the preparation method of the hot melt adhesive used in this waterproof membrane, the hot melt adhesive is made from the following raw materials: 80 parts of butyl reclaimed rubber, 20 parts of bromobutyl rubber, 15 parts of polyamide thermoplastic elastomer, 15 parts of SEBS thermoplastic elastomer, 15 parts of naphthenic rubber oil, 10 parts of polyisobutylene, 8 parts of petroleum resin, 6 parts of petroleum asphalt, 3 parts of EVA resin, and 2 parts of additives. The additives include plasticizers, fillers, vulcanization aids, vulcanization accelerators, deodorizers, and antioxidants.

[0030] Comparative Example 1: The brominated butyl rubber was replaced with butyl reclaimed rubber, and the rest was the same as Example 1.

[0031] Comparative Example 2: The polyamide thermoplastic elastomer and the SEBS thermoplastic elastomer were both replaced with an equal amount of SBS elastomer, and the rest were the same as in Example 1.

[0032] Comparative Example 3: The polyamide thermoplastic elastomer was replaced with an equal amount of SEBS thermoplastic elastomer, and the rest was the same as Example 1.

[0033] Comparative Example 4: SEBS thermoplastic elastomer was replaced with an equal amount of polyamide thermoplastic elastomer, and the rest was the same as Example 1.

[0034] Table 1: Performance test of waterproof membrane using hot melt adhesive produced with different formula components of this application

[0035]

[0036]

[0037] Table 2: Waterproof membrane performance test using hot melt adhesive produced in Comparative Examples 1 to 4

[0038]

[0039]

[0040] The experimental data above clearly demonstrates that the addition of bromobutyl rubber (Examples 1, 2, and Comparative Example 1) and SEBS thermoplastic elastomer (Examples 1, 3, 4, Comparative Example 2, 3, and 4) significantly improves the aging resistance of the waterproof membrane. Furthermore, bromobutyl rubber, with its largely saturated backbone like butyl rubber, possesses many of the performance characteristics of butyl polymers, ensuring that the hot-melt adhesive used in waterproof membranes possesses high physical strength, good vibration damping, low permeability, and resistance to aging and weathering. Furthermore, bromobutyl rubber has an extremely low water permeability, with a water absorption rate at room temperature lower than that of other rubbers, at only 1 / 10 to 1 / 15 of the latter. SEBS thermoplastic elastomer also contributes to the weather resistance of waterproof membranes using this hot-melt adhesive, significantly expanding its temperature range of use.

[0041] The polyamide thermoplastic elastomer introduced into this hot melt adhesive has excellent toughness, chemical resistance, abrasion resistance, and sound absorption. The above experimental data shows that the hot melt adhesive containing polyamide thermoplastic elastomer significantly improves the tensile strength of waterproof membranes produced using this hot melt adhesive in terms of heat aging.

[0042] SEBS thermoplastic elastomer can improve the adhesiveness, aging resistance and operating temperature of waterproof membrane, and it can also soften the temperature parameters. It can be seen that SEBS thermoplastic elastomer also plays a role in helping to dissolve the water.

[0043] A method for preparing a hot melt adhesive for a waterproof roll, the method comprising:

[0044] S1. Put butyl reclaimed rubber, bromobutyl rubber and 1 / 2 of cycloalkyl rubber oil into an internal mixer and melt them completely to obtain material A;

[0045] S2. Put polyamide thermoplastic elastomer, SEBS thermoplastic elastomer and 1 / 2 of cycloalkyl rubber oil into an internal mixer and obtain material B after they are completely melted;

[0046] S3. Material A, Material B, polyisobutylene, petroleum resin, petroleum asphalt, EVA resin, and additives are placed in a vacuum reactor and stirred and mixed. After cooling, the hot melt adhesive is obtained. The operating temperature of the internal mixer chamber in S1 is 130-140°C, and the discharge temperature is below 50-95°C. The operating temperature of the internal mixer chamber in S2 is below 149-270°C, and the discharge temperature is below 50-95°C. The operating conditions of the vacuum reactor are 50-95°C and the vacuum degree is less than -0.016.

[0047] Separately producing materials A and B allows materials with similar melting points or properties to be melted and mixed together to prevent significant temperature differences from affecting the properties of other materials. This is especially true for the bromobutyl rubber and SEBS thermoplastic elastomer, which have significant temperature differences. During production, they must be separated to prevent decomposition of the bromobutyl rubber. Melting them separately before adding them to the mixing vessel eliminates or minimizes heating, saving energy and preventing material deterioration. Furthermore, the operating temperature in the vacuum reactor should be set no higher than 95°C, and negative pressure ensures compatibility of the materials at this temperature.

[0048] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A hot melt adhesive for waterproofing membrane, characterized in that: The hot melt adhesive is made of the following raw materials: 70-80 parts of butyl reclaimed rubber, 20-25 parts of bromobutyl rubber, 15-20 parts of polyamide thermoplastic elastomer, 15-20 parts of SEBS thermoplastic elastomer, 10-15 parts of cycloalkyl rubber oil, 10-12 parts of polyisobutylene, 8-10 parts of petroleum resin, 4-6 parts of petroleum asphalt, 1-3 parts of EVA resin, and 1-2 parts of additives.

2. The hot melt adhesive for use in the waterproof roll material according to claim 1, characterized in that: 80 parts of butyl reclaimed rubber, 20 parts of bromobutyl rubber, 18 parts of polyamide thermoplastic elastomer, 18 parts of SEBS thermoplastic elastomer, 12 parts of cycloalkyl rubber oil, 10 parts of polyisobutylene, 8 parts of petroleum resin, 6 parts of petroleum asphalt, 3 parts of EVA resin, and 2 parts of additives.

3. The hot melt adhesive for use in the waterproof roll material according to claim 1, characterized in that: The additives include plasticizers, fillers, vulcanization aids, vulcanization accelerators, deodorizers, and antioxidants.

4. The method for preparing hot melt adhesive for waterproof membrane according to claim 1, characterized in that: The preparation method comprises: S1. Put butyl reclaimed rubber, bromobutyl rubber and 1 / 2 of cycloalkyl rubber oil into an internal mixer and obtain material A after they are completely melted; S2. Put polyamide thermoplastic elastomer, SEBS thermoplastic elastomer and 1 / 2 of cycloalkyl rubber oil into an internal mixer and obtain material B after they are completely melted; S3. Add material A, material B, polyisobutylene, petroleum resin, petroleum asphalt, EVA resin and additives into a vacuum reactor for stirring and mixing, and obtain the hot melt adhesive after cooling.

5. The method for preparing a hot melt adhesive for use in a waterproof membrane according to claim 4, wherein: The working temperature of the cavity of the internal mixer in S1 is 130-140°C, and the discharge temperature is lower than 50-95°C.

6. The method for preparing a hot melt adhesive for use in a waterproof membrane according to claim 4, wherein: The working temperature of the cavity of the internal mixer in S2 is lower than 149-270°C, and the discharge temperature is lower than 50-95°C.

7. The method for preparing a hot melt adhesive for a waterproof membrane according to claim 4, wherein: The working conditions of the vacuum reactor are 50-95° C. and a vacuum degree of less than -0.016.

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