A hot melt adhesive for high-temperature protective clothing and its preparation method

Abstract

This invention discloses a hot melt adhesive for high-temperature protective clothing and its preparation method, comprising the following raw materials: Fischer-Tropsch wax, styrene-isoprene-styrene block copolymer with 0% diblock content, styrene-isoprene-styrene block copolymer with 20-30% diblock content, styrene-isoprene-styrene block copolymer with 40-50% diblock content, rosin resin, petroleum resin, ethylene-vinyl acetate copolymer, and antioxidant. This hot melt adhesive requires no toxic solvents, possesses both heat resistance and water resistance, and is suitable for high-temperature protective clothing. The preparation method of this hot melt adhesive involves heating and mixing polymer materials without adding any solvents or toxic substances during the preparation process, reducing the risk of toluene poisoning, completely solving the problems of solvent evaporation and recovery, and, more importantly, eliminating safety hazards in the storage and use of organic chemicals, achieving environmentally friendly, safe, and efficient production.

Description

Technical Field

[0001] This invention relates to the technical field of hot melt adhesive preparation, specifically to a hot melt adhesive for high-temperature protective clothing and its preparation method. Background Technology

[0002] Taking protective clothing as an example, the production process of protective clothing has previously relied primarily on solvent coating. This process uses a large amount of toluene as a solvent carrier, resulting in significant environmental pollution and chemical residues, posing environmental and safety risks. It also presents considerable challenges for solvent recovery, increasing the costs for companies involved in solvent recycling and remediation. More importantly, the process from solvent coating to final winding is time-consuming, with production lines approximately 20-30 meters long, leading to low production efficiency. Furthermore, the long drying lines pose significant safety hazards. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, one objective of this invention is to provide a hot melt adhesive for high-temperature protective clothing, which uses polymer materials as raw materials, does not add any toxic solvents during the process, and has good adhesion. Another objective of this invention is to provide a method for preparing a hot melt adhesive for high-temperature protective clothing, which does not add toxic solvents during the preparation process, has simple steps, and achieves environmentally friendly, non-toxic, safe and efficient production.

[0004] One of the objectives of this invention is achieved through the following technical solution:

[0005] A hot melt adhesive for high-temperature protective clothing comprises the following raw materials in parts by weight: 10-30 parts of Fischer-Tropsch wax, preferably 20 parts; 5-18 parts of styrene-isoprene-styrene block copolymer with a diblock content of 0%, preferably 12 parts; 8-18 parts of styrene-isoprene-styrene block copolymer with a diblock content of 20-30%, preferably 20%, added in 14 parts; 5-18 parts of styrene-isoprene-styrene block copolymer with a diblock content of 40-50%, preferably 40%, added in 12 parts; 20-40 parts of rosin resin, preferably 29 parts; 2-10 parts of petroleum resin, preferably 7 parts; 2-10 parts of ethylene-vinyl acetate copolymer, preferably 7 parts; and 0.1-5 parts of antioxidant, preferably 0.3 parts; the sum of the weight parts of all raw materials is 100 parts. Wherein, the diblock content refers to the weight parts of the diblocks.

[0006] Furthermore, the melting point of the Fischer-Tropsch wax is 80–110°C.

[0007] Furthermore, the rosin resin is pentaerythritol ester and / or glycerol ester.

[0008] Furthermore, the rosin resin is a mixture of pentaerythritol ester and glycerol ester in a mass ratio of 1:1.

[0009] Furthermore, the petroleum resin is a C9 petroleum resin.

[0010] Furthermore, the softening point of the petroleum resin is 118–123°C.

[0011] Furthermore, the vinyl acetate content in the ethylene-vinyl acetate copolymer is 20 to 30 parts.

[0012] The second objective of this invention is achieved by the following technical solution:

[0013] The above-mentioned method for preparing the hot melt adhesive for high-temperature protective clothing includes the following steps:

[0014] After heating the reactor, Fischer-Tropsch wax, styrene-isoprene-styrene block copolymer with 0% diblock content, styrene-isoprene-styrene block copolymer with 40-50% diblock content, styrene-isoprene-styrene block copolymer with 20-30% diblock content, rosin resin, petroleum resin, ethylene-vinyl acetate copolymer, and antioxidant are added. The mixture is stirred at a constant temperature until homogeneous, then discharged and cooled to obtain hot melt adhesive for high-temperature protective clothing.

[0015] Furthermore, the temperature of the reactor is set to 160–175°C, the stirring speed is 40–50 r / min, and the stirring time is 3–5 h.

[0016] Furthermore, during the mixing process of the raw materials, the vacuum level is maintained at -0.1 to -0.01 MPa.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] (1) The hot melt adhesive for high-temperature protective clothing of the present invention is formulated with styrene-isoprene-styrene block copolymer (SIS) with diblock contents of 0%, 20%, and 40%, and also includes petroleum resin, Fischer-Tropsch wax, rosin resin, ethylene-vinyl acetate copolymer (EVA), and antioxidants. The SIS with a diblock content of 40% effectively improves the adhesion of the product to the protective clothing fabric, enhances the adhesion to the base fabric, and prevents water seepage. The SIS with a diblock content of 0% effectively improves the cohesive strength of the adhesive itself, effectively improves the tensile strength after bonding, and improves the water pressure strength in the water permeability test. Petroleum resin has thermal stability and can prevent the protective clothing from failing to bond after ethylene oxide sterilization. Fischer-Tropsch wax provides a wetting effect, reduces extrusion viscosity, and reduces the unwinding force of the hot melt adhesive tape. EVA improves the bonding effect on polar materials. The hot melt adhesive of the present invention does not require the addition of toxic solvents, does not pollute the environment, and has high safety. It also possesses heat resistance and water resistance, making it suitable for high-temperature protective clothing.

[0019] (2) The petroleum resin used in the hot melt adhesive of the present invention is C9 petroleum resin with a softening point of 118-123°C. The high softening point of C9 petroleum resin can significantly increase the waterproofness, corrosion resistance and high temperature resistance of the hot melt adhesive. The combination of C9 petroleum resin and SIS can also effectively improve the effective damping temperature range and improve the heat resistance of the hot melt adhesive.

[0020] (3) The hot melt adhesive preparation method of the present invention involves heating and mixing polymer materials without adding any solvents or toxic and harmful substances during the preparation process. The final hot melt adhesive is an environmentally friendly and non-toxic adhesive, which more effectively reduces the risk of toluene organic solvent poisoning, completely solves the problem of solvent evaporation and recovery, and eliminates solvent residue. More importantly, it eliminates the safety hazards in the storage and use of organic chemicals, achieving environmentally friendly, non-toxic, safe and efficient production. Furthermore, it reduces the production process, shortens the production line from about 20 meters to about 2 meters, and changes the original heating and drying to natural cooling, reducing the investment in production equipment, saving a lot of energy consumption, improving production efficiency, and increasing the overall production time by nearly 26 times. This greatly alleviates the production capacity pressure, increases the unit production capacity of protective equipment manufacturers, and effectively reduces the production cost of enterprises. Detailed Implementation

[0021] 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.

[0022] Example 1

[0023] A hot melt adhesive for high-temperature protective clothing comprises the following raw materials in parts by weight: 20 parts Fischer-Tropsch wax, 12 parts styrene-isoprene-styrene block copolymer with 0% diblock content, 14 parts styrene-isoprene-styrene block copolymer with 20% diblock content, 12 parts styrene-isoprene-styrene block copolymer with 40% diblock content, 29 parts rosin resin, 7 parts C9 petroleum resin, 7 parts ethylene-vinyl acetate copolymer, and 0.3 parts antioxidant.

[0024] The Fischer-Tropsch wax has a melting point of 95°C. The rosin resin is a mixture of pentaerythritol ester and glycerol ester in a mass ratio of 1:1. The petroleum resin has a softening point of 120°C. The ethylene-vinyl acetate copolymer (EVA) contains 28 parts of vinyl acetate (VA).

[0025] The above-mentioned method for preparing the hot melt adhesive for high-temperature protective clothing includes the following steps:

[0026] The temperature of the reactor was set to 160℃. Fischer-Tropsch wax, styrene-isoprene-styrene block copolymer with 0% diblock content, styrene-isoprene-styrene block copolymer with 40% diblock content, styrene-isoprene-styrene block copolymer with 20% diblock content, rosin resin, C9 petroleum resin, ethylene-vinyl acetate copolymer, and antioxidant were added. The temperature was maintained and the mixture was stirred at a speed of 4000 r / min for 2 hours. During the stirring process, the vacuum degree was maintained at -0.08 MPa. After stirring evenly, the mixture was discharged and cooled to obtain the hot melt adhesive for high-temperature protective clothing.

[0027] Example 2

[0028] A hot melt adhesive for high-temperature protective clothing comprises the following raw materials in parts by weight: 10 parts Fischer-Tropsch wax, 18 parts styrene-isoprene-styrene block copolymer with 0% diblock content, 18 parts styrene-isoprene-styrene block copolymer with 20% diblock content, 18 parts styrene-isoprene-styrene block copolymer with 40% diblock content, 23.9 parts rosin resin, 2 parts C9 petroleum resin, 10 parts ethylene-vinyl acetate copolymer, and 0.1 parts antioxidant.

[0029] The Fischer-Tropsch wax has a melting point of 80°C. The rosin resin is a mixture of pentaerythritol ester and glycerol ester in a mass ratio of 1:1. The petroleum resin has a softening point of 118°C. The ethylene-vinyl acetate copolymer (EVA) contains 20 parts of vinyl acetate (VA).

[0030] The above-mentioned method for preparing the hot melt adhesive for high-temperature protective clothing includes the following steps:

[0031] The temperature of the reactor was set to 175℃. Fischer-Tropsch wax, styrene-isoprene-styrene block copolymer with 0% diblock content, styrene-isoprene-styrene block copolymer with 40% diblock content, styrene-isoprene-styrene block copolymer with 20% diblock content, rosin resin, C9 petroleum resin, ethylene-vinyl acetate copolymer, and antioxidant were added. The temperature was maintained at a constant temperature and the mixture was stirred at a speed of 5000 r / min for 1 hour. During the stirring process, the vacuum degree was maintained at -0.1 MPa. After stirring evenly, the mixture was discharged and cooled to obtain the hot melt adhesive for high-temperature protective clothing.

[0032] Example 3

[0033] A hot melt adhesive for high-temperature protective clothing comprises the following raw materials in parts by weight: 17 parts Fischer-Tropsch wax, 5 parts styrene-isoprene-styrene block copolymer with 0% diblock content, 8 parts styrene-isoprene-styrene block copolymer with 30% diblock content, 5 parts styrene-isoprene-styrene block copolymer with 50% diblock content, 40 parts rosin resin, 10 parts C9 petroleum resin, 10 parts ethylene-vinyl acetate copolymer, and 5 parts antioxidant.

[0034] The Fischer-Tropsch wax has a melting point of 110°C. The rosin resin is a mixture of pentaerythritol ester and glycerol ester in a mass ratio of 1:1. The petroleum resin has a softening point of 123°C. The ethylene-vinyl acetate copolymer (EVA) contains 30 parts of vinyl acetate (VA).

[0035] The above-mentioned method for preparing the hot melt adhesive for high-temperature protective clothing includes the following steps:

[0036] The temperature of the reactor was set to 170℃. Fischer-Tropsch wax, styrene-isoprene-styrene block copolymer with 0% diblock content, styrene-isoprene-styrene block copolymer with 50% diblock content, styrene-isoprene-styrene block copolymer with 30% diblock content, rosin resin, C9 petroleum resin, ethylene-vinyl acetate copolymer, and antioxidant were added. The temperature was maintained and the mixture was stirred at a speed of 4000 r / min for 1 hour. During the stirring process, the vacuum degree was maintained at -0.01 MPa. After stirring evenly, the mixture was discharged and cooled to obtain the hot melt adhesive for high-temperature protective clothing.

[0037] Example 4

[0038] A hot melt adhesive for high-temperature protective clothing comprises the following raw materials in parts by weight: 30 parts Fischer-Tropsch wax, 14 parts styrene-isoprene-styrene block copolymer with 0% diblock content, 13 parts styrene-isoprene-styrene block copolymer with 25% diblock content, 12.5 parts styrene-isoprene-styrene block copolymer with 45% diblock content, 20 parts rosin resin, 5 parts C9 petroleum resin, 5 parts ethylene-vinyl acetate copolymer, and 0.5 parts antioxidant.

[0039] The Fischer-Tropsch wax has a melting point of 100°C. The rosin resin is pentaerythritol ester. The petroleum resin has a softening point of 120°C. The ethylene-vinyl acetate copolymer (EVA) contains 25 parts of vinyl acetate (VA).

[0040] Example 5

[0041] A hot melt adhesive for high-temperature protective clothing comprises the following raw materials in parts by weight: 19 parts Fischer-Tropsch wax, 10 parts styrene-isoprene-styrene block copolymer with 0% diblock content, 15 parts styrene-isoprene-styrene block copolymer with 23% diblock content, 15 parts styrene-isoprene-styrene block copolymer with 46% diblock content, 25 parts rosin resin, 8 parts C9 petroleum resin, 6 parts ethylene-vinyl acetate copolymer, and 2 parts antioxidant.

[0042] The Fischer-Tropsch wax has a melting point of 90°C. The rosin resin is pentaerythritol ester. The petroleum resin has a softening point of 122°C. The ethylene-vinyl acetate copolymer (EVA) contains 23 parts of vinyl acetate (VA).

[0043] The above-mentioned method for preparing the hot melt adhesive for high-temperature protective clothing includes the following steps:

[0044] The temperature of the reactor was set to 170℃. Fischer-Tropsch wax, styrene-isoprene-styrene block copolymer with 0% diblock content, styrene-isoprene-styrene block copolymer with 46% diblock content, styrene-isoprene-styrene block copolymer with 23% diblock content, rosin resin, C9 petroleum resin, ethylene-vinyl acetate copolymer, and antioxidant were added. The temperature was maintained and the mixture was stirred at a speed of 4000 r / min for 1 hour. During the stirring process, the vacuum degree was maintained at -0.01 MPa. After stirring evenly, the mixture was discharged and cooled to obtain hot melt adhesive for high-temperature protective clothing.

[0045] Comparative Example 1

[0046] The difference between Comparative Example 1 and Example 1 is that Comparative Example 1 does not add styrene-isoprene-styrene block copolymer with a diblock content of 0%, while the amount of other components added and the preparation method are the same as in Example 1.

[0047] Comparative Example 2

[0048] The difference between Comparative Example 2 and Example 1 is that Comparative Example 2 does not add styrene-isoprene-styrene block copolymer with a diblock content of 20%, while the amount of other components added and the preparation method are the same as in Example 1.

[0049] Comparative Example 3

[0050] The difference between Comparative Example 3 and Example 1 is that Comparative Example 1 does not add styrene-isoprene-styrene block copolymer with a diblock content of 40%, while the amount of other components added and the preparation method are the same as in Example 1.

[0051] Comparative Example 4

[0052] The difference between Comparative Example 4 and Example 1 is that Comparative Example 4 does not add C9 petroleum resin, while the amount of other components added and the preparation method are the same as in Example 1.

[0053] Effect and Evaluation Test

[0054] The hot melt adhesives from Examples 1-5 and Comparative Examples 1-4 were pressed together, with an adhesive application rate of 60 g / m². 2 The hot melt adhesive from Example 1 was tested, and the data are shown in Table 1. The hot melt adhesives from Example 1 and Comparative Examples 1-4 were tested for thermal stability, water resistance, tensile strength, elongation at break, and cracking after ethylene oxide sterilization, and the data are shown in Table 2.

[0055] Table 1 Performance data of the hot melt adhesive in Example 1

[0056]

[0057]

[0058]

[0059] Table 2 Performance comparison data of Example 1 and Comparative Examples 1-5

[0060]

[0061]

[0062] As shown in Table 1, the hot melt adhesive of Example 1 exhibits good thermal stability, excellent water resistance, and good mechanical properties. Furthermore, its surface remains crack-free after ethylene oxide sterilization, making it suitable for manufacturing high-temperature protective clothing. Moreover, since no organic solvents are added, it is non-toxic and harmless, resulting in an environmentally friendly and non-toxic adhesive.

[0063] Table 2 shows that the mechanical strength of Comparative Example 1 (0% diblock copolymer) was significantly reduced. In Comparative Example 3 (40% diblock copolymer), the adhesiveness was significantly reduced, and the water resistance was also greatly weakened. Comparative Example 4, lacking C9 petroleum resin, exhibited adhesive failure after ethylene oxide sterilization.

[0064] 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 hot melt adhesive for high-temperature protective clothing, characterized in that, It includes the following raw materials by weight: 10-30 parts Fischer-Tropsch wax, 5-18 parts styrene-isoprene-styrene block copolymer with 0% diblock content, 8-18 parts styrene-isoprene-styrene block copolymer with 20-30% diblock content, 5-18 parts styrene-isoprene-styrene block copolymer with 40-50% diblock content, 20-40 parts rosin resin, 2-10 parts petroleum resin, 2-10 parts ethylene-vinyl acetate copolymer, and 0.1-5 parts antioxidant; The petroleum resin is a C9 petroleum resin with a softening point of 118-123℃.

2. The hot melt adhesive for high-temperature protective clothing as described in claim 1, characterized in that, The melting point of the Fischer-Tropsch wax is 80–110°C.

3. The hot melt adhesive for high-temperature protective clothing as described in claim 1, characterized in that, The rosin resin is pentaerythritol ester and / or glycerol ester.

4. The hot melt adhesive for high-temperature protective clothing as described in claim 1, characterized in that, The rosin resin is pentaerythritol ester and glycerol ester in a mass ratio of 1:

1.

5. The hot melt adhesive for high-temperature protective clothing as described in claim 1 or 4, characterized in that, The vinyl acetate content in the ethylene-vinyl acetate copolymer is 20-30 parts.

6. The method for preparing the hot melt adhesive for high-temperature protective clothing according to any one of claims 1 to 5, characterized in that, The process includes the following steps: After heating the reactor, Fischer-Tropsch wax, styrene-isoprene-styrene block copolymer with a diblock content of 0%, styrene-isoprene-styrene block copolymer with a diblock content of 40-50%, styrene-isoprene-styrene block copolymer with a diblock content of 20-30%, rosin resin, petroleum resin, ethylene-vinyl acetate copolymer, and antioxidant are added. The mixture is stirred at a constant temperature until homogeneous, then discharged and cooled to obtain a hot melt adhesive for high-temperature protective clothing.

7. The method for preparing the hot melt adhesive for high-temperature protective clothing as described in claim 6, characterized in that, Set the temperature of the reactor to 160–175℃, the stirring speed to 40–50 r / min, and the stirring time to 3–5 h.

8. The method for preparing the hot melt adhesive for high-temperature protective clothing as described in claim 6, characterized in that, During the mixing of raw materials, the vacuum level is maintained at -0.1 to -0.01 MPa.

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