Hot melt adhesive for sponge mat and preparation method of hot melt adhesive

Abstract

The invention relates to the technical field of hot melt adhesives, and discloses a hot melt adhesive for a sponge mat and a preparation method thereof.The hot melt adhesive is prepared from, by weight, 15-25 parts of modified nylon, 15-25 parts of Fischer-Tropsch wax, 40-50 parts of an EVA material, 25-35 parts of petroleum resin and 0.2-0.5 part of an antioxidant; the density of the hot melt adhesive at the temperature of 160 to 170 DEG C is 0.85 to 0.87 g / ml. Through the compatibility of the modified nylon and the Fischer-Tropsch wax, the density of the sprayed hot melt adhesive can be reduced, the humidity and penetration depth of the hot melt adhesive on the non-woven fabric are improved, and the manufacturing cost of the sponge mat is reduced. The preparation method of the hot melt adhesive provided by the invention has the advantage of low energy consumption and is more environment-friendly.

Description

Technical Field

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

[0002] Hot melt adhesive has the advantage of being easy to spray and use, and is widely used in furniture production.

[0003] The sponge pad in the Simmons mattress in the prior art is made by bonding non-woven fabric and sponge through spraying hot melt adhesive.

[0004] If the wettability of the hot melt adhesive used in the non-woven fabric is not high, or the density of the hot melt adhesive is too high, the amount of hot melt adhesive used will increase, which will in turn increase the manufacturing cost of the sponge pad. Summary of the invention

[0005] In view of the above problems, the first purpose of the present invention is to provide a hot melt adhesive for sponge pads to solve the problem of large amount of hot melt adhesive used in the production of sponge pads and the increase in the manufacturing cost of the sponge pads caused by this.

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

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] A hot melt adhesive for a sponge pad is sprayed on the bonding point between the non-woven fabric and the sponge pad. The raw material components of the hot melt adhesive include 15-25 parts of modified nylon, 15-25 parts of Fischer-Tropsch wax, 40-50 parts of EVA material, 25-35 parts of petroleum resin and 0.2-0.5 parts of antioxidant according to weight parts;

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

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

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

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

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

[0014] Furthermore, the present invention provides a method for preparing a hot melt adhesive, which is used to prepare the hot melt adhesive for the sponge pad described above, comprising the following steps:

[0015] S1) adding a formulated amount of modified nylon into a stirred tank, heating to a set temperature, evacuating the tank, and stirring the modified nylon until it is completely melted;

[0016] S2) adding EVA material, controlling the material temperature, evacuating, and stirring until there are no particles;

[0017] S3) hydrogenating petroleum resin, rosin resin and Fischer-Tropsch wax in sequence, controlling the material temperature, evacuating the mixture, and stirring until no particles are formed;

[0018] S4) standing still under normal pressure to remove bubbles, filtering the material, and cooling at room temperature to obtain the hot melt adhesive.

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

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

[0021] The beneficial effect of the above technical solution of the present invention is that the hot melt adhesive used for the sponge pad improves the wettability and penetration depth of the hot melt adhesive on the non-woven fabric through the combination of modified nylon and Fischer-Tropsch wax, reduces the density of the sprayed hot melt adhesive, and thus reduces the manufacturing cost of the sponge pad.

[0022] Furthermore, the preparation method of the hot melt adhesive proposed in the present invention has a simple process, low energy consumption, and is more environmentally friendly. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further illustrated below through specific implementation methods.

[0024] In the description of this specification, the description with reference to the terms "embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

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

[0026] A hot melt adhesive for a sponge pad is sprayed on the bonding point between the non-woven fabric and the sponge pad. The raw material components of the hot melt adhesive include 15-25 parts of modified nylon, 15-25 parts of Fischer-Tropsch wax, 40-50 parts of EVA material, 25-35 parts of petroleum resin and 0.2-0.5 parts of antioxidant according to weight parts;

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

[0028] The hot melt adhesive for the sponge pad of the present invention, the modified nylon can make the hot melt adhesive have moderate elasticity, the Fischer-Tropsch wax can increase the wettability and penetration depth of the hot melt adhesive on the non-woven fabric, and the density of the hot melt adhesive sprayed at 160-170°C can be reduced by combining the modified nylon and the Fischer-Tropsch wax, thereby reducing the manufacturing cost of the sponge pad.

[0029] The above EVA materials are preferably made of EA19400 from LG of South Korea. 。

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

[0031] Since the sour taste of EVA material is more obvious, adding 10-20 parts of rosin resin can improve the smell of hot melt adhesive. Rosin resin also has a viscosity-increasing effect, which is beneficial to improving the adhesion of hot melt adhesive.

[0032] The rosin resin is preferably Komao 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 pollution-free, odorless and having low viscosity at high temperatures. It can improve the fluidity and heat resistance of hot melt adhesives and increase the wetting wetness of hot melt adhesives in non-woven fabrics. SX70 Fischer-Tropsch wax also has a higher coagulation point, which can improve the quick-drying properties of hot melt adhesives.

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

[0036] Hydrogenated petroleum resin has better thermal stability, which is beneficial to improving the stability of hot melt adhesive. Jinhai JH6100 or JH6125 hydrogenated petroleum resin is preferably used.

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

[0038] The selected modified nylon has a low softening point, and the melting point of the modified nylon matches the spraying temperature of the hot melt adhesive, which can improve the smoothness of the hot melt adhesive and is beneficial to improving the wettability and penetration depth of the hot melt adhesive in the non-woven fabric.

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

[0040] Furthermore, the present invention provides a method for preparing a hot melt adhesive, which is used to prepare the hot melt adhesive for the sponge pad described above, comprising the following steps:

[0041] S1) adding a formulated amount of modified nylon into a stirred tank, heating to a set temperature, evacuating the tank, and stirring the modified nylon until it is completely melted;

[0042] S2) adding EVA material, controlling the material temperature, evacuating, and stirring until there are no particles;

[0043] S3) hydrogenating petroleum resin, rosin resin and Fischer-Tropsch wax in sequence, controlling the material temperature, evacuating the mixture, and stirring until no particles are formed;

[0044] S4) standing still under normal pressure to remove bubbles, filtering the material, and cooling at room temperature to obtain the hot melt adhesive.

[0045] The preparation method of the hot melt adhesive of the present invention improves the distribution uniformity of the EVA material by melting the EVA material into the modified nylon, and vacuumizes during the preparation process to prevent bubbles from being generated 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°C; in step S2), the material temperature is 120-130°C; in step S3), the material temperature is 110-120°C.

[0047] Heat to 160-170°C, which is higher than the softening temperature of the modified nylon, so that the modified nylon is completely melted.

[0048] From step S1) to step S3), the material temperature decreases successively, 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 evacuating and maintaining negative pressure, bubbles are prevented from forming in the hot melt adhesive.

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

[0052] 1. According to the raw material ratios in Table 1, the hot melt adhesives of each embodiment and each comparative example were prepared according to the following steps:

[0053] S1) adding a formulated amount of modified nylon into a stirred tank, heating to a set temperature, evacuating the tank, and stirring the modified nylon until it is completely melted;

[0054] S2) adding EVA material, controlling the material temperature, evacuating, and stirring until there are no particles;

[0055] S3) hydrogenating petroleum resin, rosin resin and Fischer-Tropsch wax in sequence, controlling the material temperature, evacuating the mixture, and stirring until no particles are formed;

[0056] S4) standing still under normal pressure to remove bubbles, filtering the material, and cooling at room temperature to obtain the hot melt adhesive;

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

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

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

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

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

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

[0063] 2.1 According to the static weighing method, the density of the test samples of the hot melt adhesives of each embodiment and each comparative example at 23°C was measured;

[0064] 2.2 Weigh 80.0 g of the hot melt adhesive of each embodiment and each comparative example respectively, place them in 100 ml measuring cylinders respectively, heat them to 150° C. for 40 min until they are completely melted, and then place them at 160° C., 170° C. and 180° C. respectively, keep the temperature constant for 60 min, read the volume, and calculate the density of the hot melt adhesive of each embodiment and each comparative example at 160° C., 170° C. and 180° C. according to the calculation formula of density = volume / mass;

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

[0066] 2.4 With reference to GB / T 4851-2014, the holding force of the hot melt adhesives used in each embodiment and each comparative example for bonding non-woven fabrics was tested using a holding tester with a weight of 1 kg.

[0067] Table 1 Raw material ratio and test results of Examples 1-4

[0068]

[0069] From the test results in Table 1, it can be seen that the hot melt adhesive for sponge pads of Examples 1-3 of the present invention has a softening point of 88-95°C, a density of 0.85-0.87 g / ml at 160-170°C, a peeling force of 32-36 N and a holding force of 54-72 min for the hot melt adhesive sprayed on the non-woven fabric, and has good performance.

[0070] In summary, the hot melt adhesive for the sponge pad improves the wettability and penetration depth of the hot melt adhesive on the non-woven fabric by combining modified nylon and Fischer-Tropsch wax, reduces the density of the hot melt adhesive sprayed at 160-170°C, and thus reduces the manufacturing cost of the sponge pad.

[0071] Furthermore, the preparation method of the hot melt adhesive proposed in the present invention has a simple process, low energy consumption, and is more environmentally friendly.

[0072] The technical principle of the present invention is described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without paying creative labor, and these methods will fall within the scope of protection of the present invention.

Claims

1. A hot melt adhesive for a sponge pad, sprayed on the bonding point between the non-woven fabric and the sponge pad, characterized in that: Calculated by weight, the raw material components of the hot melt adhesive include 15-25 parts of modified nylon, 15-25 parts of Fischer-Tropsch wax, 40-50 parts of EVA material, 25-35 parts of petroleum resin and 0.2-0.5 parts of antioxidant; The density of the hot melt adhesive at 160-170° C. is 0.85-0.87 g / ml.

2. The hot melt adhesive for sponge pad according to claim 1, characterized in that: The raw material components of the hot melt adhesive also include 10-20 parts of rosin resin.

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

4. The hot melt adhesive for sponge pad according to claim 1, characterized in that: The petroleum resin is hydrogenated petroleum resin.

5. The hot melt adhesive for sponge pad according to claim 1, characterized in that: The modified nylon has a softening point of 138-140°C, a melting point of 150-170°C, and a viscosity of 16000-42000 maP.s at 150-170°C.

6. A method for preparing a hot melt adhesive, characterized in that: The method for preparing the hot melt adhesive for sponge pad according to any one of claims 1 to 5 comprises the following steps: S1) adding a formulated amount of modified nylon into a stirred tank, heating to a set temperature, evacuating the tank, and stirring the modified nylon until it is completely melted; S2) adding EVA material, controlling the material temperature, evacuating, and stirring until there are no particles; S3) hydrogenating petroleum resin, rosin resin and Fischer-Tropsch wax in sequence, controlling the material temperature, evacuating the mixture, and stirring until no particles are formed; S4) standing still under normal pressure to remove bubbles, filtering the material, and cooling at room temperature to obtain the hot melt adhesive.

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

8. The method for preparing hot melt adhesive according to claim 5, characterized in that: In steps S1) to S3), the vacuum pressure is -0.09 to -0.12 MPa.

Images