A hot melt adhesive for sponge pads and its preparation method

Abstract

This invention relates to the field of hot melt adhesive technology, and discloses a hot melt adhesive for sponge pads and its preparation method. The hot melt adhesive, by weight, comprises 15-25 parts modified nylon, 15-25 parts Fischer-Tropsch wax, 40-50 parts EVA material, 25-35 parts petroleum resin, and 0.2-0.5 parts antioxidant; the density of the hot melt adhesive at 160-170℃ is 0.85-0.87 g / ml. By combining modified nylon and Fischer-Tropsch wax, the density of the sprayed hot melt adhesive can be reduced, the wetting and penetration depth of the hot melt adhesive on nonwoven fabrics can be increased, and the manufacturing cost of sponge pads can be reduced. The hot melt adhesive preparation method proposed in this invention has the advantages of low energy consumption and is more environmentally friendly.

Description

Technical Field

[0001] This invention relates to the field of hot melt adhesive technology, and in particular to a hot melt adhesive for sponge pads and its preparation method. Background Technology

[0002] Hot melt adhesives are widely used in furniture production due to their convenient application and spraying properties.

[0003] The foam padding inside a Simmons mattress in the present technology is made by bonding non-woven fabric and foam together with sprayed hot melt adhesive.

[0004] If the hot melt adhesive used has low wettability on the nonwoven fabric or high density, it will lead to an increase in the amount of hot melt adhesive used, which in turn will increase the manufacturing cost of the sponge pad. Summary of the Invention

[0005] To address the aforementioned problems, the primary objective of this invention is to provide a hot melt adhesive for sponge pads, thereby resolving the issues of excessive hot melt adhesive usage during sponge pad production and the resulting increase in manufacturing costs.

[0006] The second objective of this invention is to provide a method for preparing hot melt adhesive in order to reduce energy consumption during the preparation process.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] A hot melt adhesive for sponge pads is sprayed onto the bonding area between nonwoven fabric and sponge pads. The raw material composition of the hot melt adhesive, calculated by weight, includes 15-25 parts modified nylon, 15-25 parts Fischer-Tropsch wax, 40-50 parts EVA material, 25-35 parts petroleum resin, and 0.2-0.5 parts antioxidant.

[0009] The density of the hot melt adhesive at 160-170℃ is 0.85-0.87 g / ml.

[0010] Furthermore, the raw material composition of the hot melt adhesive also includes 10-20 parts of rosin resin.

[0011] Preferably, the Fischer-Tropsch wax is Shell SX70 Fischer-Tropsch wax.

[0012] Preferably, the petroleum resin is a hydrogenated petroleum resin.

[0013] Preferably, the modified nylon has a softening point of 138-140℃, a melting point of 150-170℃, and a viscosity of 16000-42000 mAP.s at 150-170℃.

[0014] Furthermore, this invention proposes a method for preparing a hot melt adhesive for use in sponge pads, comprising the following steps:

[0015] S1) In a mixing tank, add the amount of modified nylon specified in the formula, heat to the set temperature, draw a vacuum, and stir the modified nylon until it is completely melted;

[0016] S2) Add EVA material, control the material temperature, vacuum, and stir until there are no particles;

[0017] S3) Hydrogenate petroleum resin, rosin resin and Fischer-Tropsch wax in sequence, control the material temperature, vacuum, and stir until there are no particles.

[0018] S4) Allow the mixture to stand under normal pressure to remove air bubbles, filter the material, and cool it at room temperature to obtain the hot melt adhesive.

[0019] Preferably, in step S1), the temperature is set to 160-170℃; in step S2), the material temperature is 120-130℃; and in step S3), the material temperature is 110-120℃.

[0020] Preferably, in steps S1) to S3), the vacuum pressure is -0.09 to -0.12 MPa.

[0021] The beneficial effects of the above-mentioned technical solution of the present invention are as follows: the hot melt adhesive used for sponge pads, through the compatibility of modified nylon and Fischer-Tropsch wax, improves the wettability and penetration depth of the hot melt adhesive on non-woven fabric, reduces the density of the sprayed hot melt adhesive, thereby reducing the manufacturing cost of sponge pads.

[0022] Furthermore, the hot melt adhesive preparation method proposed in this invention is simple, energy-efficient, and more environmentally friendly. Detailed Implementation

[0023] The technical solution of the present invention will be further illustrated below through specific embodiments.

[0024] In the description of this specification, references to terms such as "embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0025] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

[0026] A hot melt adhesive for sponge pads is sprayed onto the bonding area between nonwoven fabric and sponge pads. The raw material composition of the hot melt adhesive, calculated by weight, includes 15-25 parts modified nylon, 15-25 parts Fischer-Tropsch wax, 40-50 parts EVA material, 25-35 parts petroleum resin, and 0.2-0.5 parts antioxidant.

[0027] The density of the hot melt adhesive at 160-170℃ is 0.85-0.87 g / ml.

[0028] The hot melt adhesive for sponge pads of the present invention uses modified nylon to give the hot melt adhesive moderate elasticity, and Fischer-Tropsch wax to improve the wettability and penetration depth of the hot melt adhesive on nonwoven fabrics. By combining modified nylon and Fischer-Tropsch wax, the density of hot melt adhesive sprayed at 160-170°C can be reduced, thereby reducing the manufacturing cost of sponge pads.

[0029] The preferred EVA material used above is EA19400 from LG, South Korea. 。

[0030] Furthermore, the raw material composition of the hot melt adhesive also includes 10-20 parts of rosin resin.

[0031] Since EVA material has a noticeable acidic smell, adding 10-20 parts of rosin resin can improve the odor of the hot melt adhesive. Rosin resin also has a tackifying effect, which is beneficial to improving the adhesion of the hot melt adhesive.

[0032] The preferred rosin resin is Kemao KA-100L.

[0033] Preferably, the Fischer-Tropsch wax is Shell SX70 Fischer-Tropsch wax.

[0034] Shell SX70 Fischer-Tropsch wax has the advantages of being non-polluting, odorless, and having low viscosity at high temperatures. It can improve the flowability and heat resistance of hot melt adhesives and increase the wetting humidity of hot melt adhesives on nonwoven fabrics. SX70 Fischer-Tropsch wax also has a high setting point, which can improve the fast drying properties of hot melt adhesives.

[0035] Preferably, the petroleum resin is a hydrogenated petroleum resin.

[0036] Hydrogenated petroleum resins exhibit better thermal stability, which is beneficial for improving the stability of hot melt adhesives. Jinhai JH6100 or JH6125 hydrogenated petroleum resins are preferred.

[0037] Preferably, the modified nylon has a softening point of 138-140℃, a melting point of 150-170℃, and a viscosity of 16000-42000 mAP.s at 150-170℃.

[0038] The selected modified nylon has a low softening point, and its melting point matches the spraying temperature of the hot melt adhesive, which can improve the smoothness of hot melt adhesive dispensing and is beneficial to increasing the wettability and penetration depth of the hot melt adhesive on nonwoven fabrics.

[0039] The modified nylon is preferably Degussa PA12E40-S3.

[0040] Furthermore, this invention proposes a method for preparing a hot melt adhesive for use in sponge pads, comprising the following steps:

[0041] S1) In a mixing tank, add the amount of modified nylon specified in the formula, heat to the set temperature, draw a vacuum, and stir the modified nylon until it is completely melted;

[0042] S2) Add EVA material, control the material temperature, vacuum, and stir until there are no particles;

[0043] S3) Hydrogenate petroleum resin, rosin resin and Fischer-Tropsch wax in sequence, control the material temperature, vacuum, and stir until there are no particles.

[0044] S4) Allow the mixture to stand under normal pressure to remove air bubbles, filter the material, and cool it at room temperature to obtain the hot melt adhesive.

[0045] The method for preparing the hot melt adhesive of the present invention improves the uniformity of EVA material distribution by melting EVA material into modified nylon, and vacuuming is performed during the preparation process to prevent air bubbles from forming in the hot melt adhesive, thereby ensuring the quality of the sprayed hot melt adhesive.

[0046] Preferably, in step S1), the temperature is set to 160-170℃; in step S2), the material temperature is 120-130℃; and in step S3), the material temperature is 110-120℃.

[0047] Heat to 160-170℃, above the softening temperature of the modified nylon, to completely melt the modified nylon.

[0048] From step S1) to S3), the material temperature decreases sequentially, which is more conducive to reducing the energy consumption of the preparation process.

[0049] Preferably, in steps S1) to S3), the vacuum pressure is -0.09 to -0.12 MPa.

[0050] By drawing a vacuum and maintaining negative pressure, air bubbles are prevented from forming inside the hot melt adhesive.

[0051] Examples 1-3 and Comparative Examples 1-2

[0052] 1. Prepare the hot melt adhesives for each example and comparative example according to the raw material ratios in Table 1 and the following steps:

[0053] S1) In a mixing tank, add the amount of modified nylon specified in the formula, heat to the set temperature, draw a vacuum, and stir the modified nylon until it is completely melted;

[0054] S2) Add EVA material, control the material temperature, vacuum, and stir until there are no particles;

[0055] S3) Hydrogenate petroleum resin, rosin resin and Fischer-Tropsch wax in sequence, control the material temperature, vacuum, and stir until there are no particles.

[0056] S4) Let it stand under normal pressure to remove air bubbles, filter the material, and cool it at room temperature to obtain the hot melt adhesive.

[0057] In step S1), the temperature is set to 160-170℃; in step S2), the material temperature is set to 120-130℃; in step S3), the material temperature is set to 110-120℃.

[0058] In steps S1) to S3), the vacuum pressure is -0.09 to -0.12 MPa;

[0059] The EVA material is grade EA19400 from LG Korea. ；

[0060] The grade of rosin resin is Kemao KA-100L; the grade of Fischer-Tropsch wax is Shell SX70;

[0061] The hydrogenated petroleum resin is designated as Jinhai JH6100; the modified nylon is designated as Degussa PA12E40-S3.

[0062] 2. The following steps were followed to test each embodiment and each comparative example. The test results are shown in Table 1:

[0063] 2.1 The density of the test samples of the hot melt adhesives of each embodiment and each comparative example at 23℃ was determined by the static weighing method;

[0064] 2.2 Weigh 80.0g of the hot melt adhesive from each example and each comparative example, place them in a 100ml graduated cylinder, heat to 150℃ for 40min until completely melted, and then place them at 160℃, 170℃ and 180℃ respectively for 60min. Read the volume and calculate the density of the hot melt adhesive from each example and each comparative example at 160℃, 170℃ and 180℃ according to the formula density = volume / mass.

[0065] 2.3 Referring to GB / T 2792-2014, the peel force of the hot melt adhesive used for bonding nonwoven fabrics in each embodiment and each comparative example was tested at a test speed of 100 mm / min.

[0066] 2.4 Referring to GB / T 4851-2014, using a holding power tester with a 1kg weight, the holding power of the hot melt adhesive used in each embodiment and comparative example for bonding nonwoven fabrics was tested.

[0067] Table 1. Raw material ratios and test results for Examples 1-4

[0068]

[0069] As can be seen from the test results in Table 1, the hot melt adhesive for sponge pads of the present invention described in Examples 1-3 has a softening point of 88-95℃, a density of 0.85-0.87g / ml at 160-170℃, a peel force of 32-36N and a holding power of 54-72min when sprayed on non-woven fabrics, and exhibits good performance.

[0070] In summary, the hot melt adhesive used for sponge pads, through the compatibility of modified nylon and Fischer-Tropsch wax, improves the wettability and penetration depth of the hot melt adhesive on nonwoven fabrics, reduces the density of the hot melt adhesive sprayed at 160-170℃, thereby reducing the manufacturing cost of sponge pads.

[0071] Furthermore, the hot melt adhesive preparation method proposed in this invention is simple, energy-efficient, and more environmentally friendly.

[0072] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of the invention and should not be construed as limiting the scope of protection of the invention in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of the invention without inventive effort, and these embodiments will all fall within the scope of protection of the present invention.

Claims

1. A hot melt adhesive for sponge pads, sprayed onto the bonding area between nonwoven fabric and sponge pads, characterized in that, The raw material composition of the hot melt adhesive, calculated by weight, includes 15-25 parts modified nylon, 15-25 parts Fischer-Tropsch wax, 40-50 parts EVA material, 25-35 parts petroleum resin, and 0.2-0.5 parts antioxidant. The modified nylon is designated as Degussa PA12 E40-S3. The hot melt adhesive has a density of 0.85-0.87 g / ml at 160-170℃.

2. The hot melt adhesive for sponge pads according to claim 1, characterized in that, The raw material composition of the hot melt adhesive also includes 10-20 parts of rosin resin.

3. The hot melt adhesive for sponge pads according to claim 1, characterized in that, The Fischer-Tropsch wax is Shell SX70 Fischer-Tropsch wax.

4. The hot melt adhesive for sponge pads according to claim 2, characterized in that, The petroleum resin is a hydrogenated petroleum resin.

5. A method for preparing a hot melt adhesive, characterized in that, The method for preparing the hot melt adhesive for sponge pads according to claim 4 comprises the following steps: S1) In a mixing tank, add the amount of modified nylon specified in the formula, heat to the set temperature, draw a vacuum, and stir the modified nylon until it is completely melted; S2) Add EVA material, control the material temperature, vacuum, and stir until there are no particles; S3) Hydrogenate petroleum resin, rosin resin and Fischer-Tropsch wax in sequence, control the material temperature, vacuum, and stir until there are no particles. S4) Let it stand under normal pressure to remove air bubbles, filter the material, and cool it at room temperature to obtain the hot melt adhesive.

6. The method for preparing hot melt adhesive according to claim 5, characterized in that, In step S1), the temperature is set to 160-170℃; in step S2), the material temperature is set to 120-130℃; in step S3), the material temperature is set to 110-120℃.

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