Mildew-proof sponge material and preparation method thereof

Abstract

This application relates to an anti-mildew sponge material and its preparation method, belonging to the field of sponge material technology; the anti-mildew sponge material comprises the following raw materials in parts by weight: 100-120 parts natural latex, 1-3 parts sulfur, 1.5-2.2 parts accelerator, 1.8-2.2 parts potassium oleate, 2.2-2.4 parts ammonium sulfate, 1-3 parts zinc oxide, 0.2-0.6 parts sodium fluorosilicate, 2-6 parts pineapple leaf fiber, and 0.8-1.6 parts potassium hydroxide; this application has the effect of improving the anti-mildew and antibacterial properties of sponge materials.

Description

Technical Field

[0001] This application relates to the field of sponge materials, and in particular to an anti-mildew sponge material and its preparation method. Background Technology

[0002] Natural latex sponge is a low-density, porous, open-cell material, a continuous rubbery foam, and one of the natural rubber foaming materials. Due to its excellent air permeability, cushioning and pressure-reducing properties, sound and heat insulation, cold resistance, and resistance to compression fatigue, latex sponge is widely used in industrial production and daily life.

[0003] Latex sponges are made from natural latex, which contains a small amount of protein. The presence of protein makes sponge products susceptible to mold contamination in humid and hot environments, leading to mold growth and affecting their usability. Summary of the Invention

[0004] To improve the anti-mildew and antibacterial properties of sponge materials, this application provides an anti-mildew sponge material and its preparation method.

[0005] Firstly, this application provides an anti-mildew sponge material, which adopts the following technical solution: An anti-mildew sponge material comprises the following raw materials in parts by weight: 100-120 parts natural latex, 1-3 parts sulfur, 1.5-2.2 parts accelerator, 1.8-2.2 parts potassium oleate, 2.2-2.4 parts ammonium sulfate, 1-3 parts zinc oxide, 0.2-0.6 parts sodium fluorosilicate, 2-6 parts pineapple leaf fiber, and 0.8-1.6 parts potassium hydroxide.

[0006] By adopting the above technical solution, the non-fibrous components in pineapple leaf fiber, such as phenols and flavonoids, can resist the growth of various microorganisms, thereby inhibiting or even killing bacteria. Therefore, adding pineapple leaf fiber to sponge materials can improve their anti-mildew and antibacterial properties. Furthermore, potassium oleate and ammonium sulfate are used as foaming agents, zinc oxide and sodium fluorosilicate as gelling agents, and potassium hydroxide as a stabilizer, all added together to the sponge. These components work synergistically to effectively improve the stability of the sponge material, thus significantly enhancing its anti-mildew properties.

[0007] Preferably, the modified preparation method of the pineapple leaf fiber includes the following steps: Modified pineapple leaf fiber is prepared by mixing pineapple leaf fiber and epoxidized natural latex and stirring evenly.

[0008] By employing the above technical solution, the poor compatibility between pineapple leaf fiber (a polar filler) and non-polar natural latex, resulting in poor dispersion of pineapple leaf fiber in sponge materials and a tendency for fiber aggregation, can be addressed. The polar nature of the epoxidized natural latex allows its epoxy groups to undergo ring-opening reactions with the hydroxyl groups on the surface of the pineapple leaf fiber, forming covalent ether bonds. Furthermore, the epoxidized natural latex exhibits excellent compatibility with non-polar natural latex. Therefore, epoxidized natural latex can act as a binder, connecting the polar pineapple leaf fiber with the non-polar natural latex molecules, effectively enhancing the dispersibility of pineapple leaf fiber in sponge materials.

[0009] Preferably, the mass ratio of the pineapple leaf fiber to the epoxidized natural latex is 1:(0.1-0.5).

[0010] By adopting the above technical solution, the mass ratio of pineapple leaf fiber and epoxidized natural latex is controlled within the above range, thereby effectively improving the dispersibility of pineapple leaf fiber in sponge materials.

[0011] Preferably, it also includes 1.6-2.0 parts of arginine.

[0012] By adopting the above technical solution, the guanidinium group of arginine carries a positive charge, which can bind to the negatively charged region of the bacterial cell membrane, causing membrane structure damage and thus inhibiting bacterial reproduction. In addition, the amino group on arginine can form hydrogen bonds with the hydroxyl groups on the fiber surface of pineapple leaf fibers, effectively improving the stability of arginine in sponge materials and enhancing the anti-mildew and antibacterial properties of sponge materials.

[0013] Preferably, the method for preparing modified arginine includes the following steps: Arginine was added to MES buffer, followed by 1-ethyl-(3-dimethylaminopropyl)carbodiimide and N-hydroxysuccinimide. After the reaction was complete, it was mixed with chitosan and stirred evenly to obtain modified arginine.

[0014] By adopting the above technical solution, 1-ethyl-(3-dimethylaminopropyl)carbodiimide and N-hydroxysuccinimide are used as coupling agents, which enable the carboxyl group of arginine to react with the amino group in chitosan to form an amide bond, reducing the possibility of arginine self-polymerization. Chitosan has good biocompatibility, which improves the stability of modified arginine in sponge materials.

[0015] In addition, the guanidin group of arginine and the cationic group of chitosan synergistically enhance the antibacterial effect of modified arginine, thereby further improving the anti-mildew and antibacterial properties of sponge materials.

[0016] Preferably, the mass ratio of arginine to chitosan is 1:(1.2-1.6).

[0017] By adopting the above technical solution and controlling the mass ratio of arginine and chitosan within the above range, the stability of arginine in sponge materials can be effectively improved.

[0018] Preferably, the accelerators include zinc diethyldithiocarbamate and 2-mercaptobenzothiazole.

[0019] Secondly, this application provides a method for preparing an anti-mildew sponge material as described in the first aspect, employing the following technical solution: A method for preparing an anti-mildew sponge material includes the following steps: S1. After mixing sulfur, accelerator, pineapple leaf fiber, potassium hydroxide, sodium caseinate aqueous solution and deionized water, stir evenly to obtain a mixed dispersion. S2. After mixing natural latex and the mixed dispersion, the mixture is cured. Potassium oleate and ammonium sulfate are added for foaming treatment. Then, the mixture is slowed down for foam homogenization treatment. After homogenization, zinc oxide is added. After stirring, sodium fluorosilicate is added. When the mixture reaches the gelation point, it is immediately poured into the mold. The process is carried out in sequence: shaping, vulcanization, water washing for demolding, and drying to obtain the mildew-resistant sponge material.

[0020] In summary, this application includes at least one of the following beneficial technical effects: Because pineapple leaf fiber contains non-fibrous components such as phenols and flavonoids, which can resist the growth of various microorganisms and thus inhibit or even kill bacteria, adding pineapple leaf fiber to sponge materials can improve their anti-mildew and antibacterial properties. Furthermore, potassium oleate and ammonium sulfate are used as foaming agents, zinc oxide and sodium fluorosilicate as gelling agents, and potassium hydroxide as a stabilizer; these components work synergistically to effectively improve the stability of the sponge material, thereby significantly enhancing its anti-mildew properties.

[0021] Arginine's guanidino group carries a positive charge, which can bind to the negatively charged region of the bacterial cell membrane, causing membrane structure disruption and thus inhibiting bacterial growth. In addition, the amino group on arginine can form hydrogen bonds with the hydroxyl groups on the surface of pineapple leaf fibers, effectively improving the stability of arginine in sponge materials and enhancing the anti-mildew and antibacterial properties of sponge materials. Detailed Implementation

[0022] This application discloses an anti-mildew sponge material and its preparation method.

[0023] All raw materials involved in this application are commercially available. Natural latex (CAS No.: 9003-31-0) was provided by Jinan Xinzheng Chemical Co., Ltd., potassium oleate (CAS No.: 143-18-0) was provided by Jinan Feiyue Chemical Co., Ltd., and ammonium sulfate (CAS No.: 7783-20-2) was provided by Jinan Shengfeng Industry and Trade Co., Ltd.; zinc oxide (CAS No.: 1314-13-2) was provided by Ningbo Luofei Nanotechnology Co., Ltd.; sodium fluorosilicate (CAS No.: 16893-85-9) was provided by Wuhan Jiyesheng Chemical Co., Ltd.; potassium hydroxide (CAS No.: 1310-58-3) was provided by Shanghai Hongrui Chemical Co., Ltd.; pineapple leaf fiber (CAS No.: 9004-17-9) was provided by the Institute of Agricultural Machinery, Chinese Academy of Tropical Agricultural Sciences; epoxidized natural latex (CAS No.: 138009-59-3) was provided by the pilot plant of the Institute of Agricultural Product Processing, Chinese Academy of Tropical Agricultural Sciences; and arginine (CAS No.: 74-79-3) was provided by Wuxi Bikang Bioengineering Co., Ltd. Example

[0024] The anti-mildew sponge material comprises the following raw materials by weight: 100g natural latex, 1g sulfur, 1.5g accelerator, 1.8g potassium oleate, 2.2g ammonium sulfate, 1g zinc oxide, 0.2g sodium fluorosilicate, 2g pineapple leaf fiber, and 0.8g potassium hydroxide.

[0025] The accelerators include zinc diethyldithiocarbamate and 2-mercaptobenzothiazole, and the mass ratio of zinc diethyldithiocarbamate to 2-mercaptobenzothiazole is 1:0.6.

[0026] The preparation method of the accelerator includes the following steps: Zinc diethyldithiocarbamate and 2-mercaptobenzothiazole were mixed and stirred evenly to obtain an accelerator.

[0027] The preparation method of anti-mildew sponge material includes the following steps: S1. Mix 1g of sulfur, 1.5g of accelerator, 2g of pineapple leaf fiber, 0.8g of potassium hydroxide, 1g of sodium caseinate aqueous solution (the mass concentration of sodium caseinate aqueous solution is 10%) and 7g of deionized water, and stir evenly to obtain a mixed dispersion. S2. Mix 100g of natural latex and the mixed dispersion and cure at 25℃ for 24h. Then add 1.8g of potassium oleate and 2.2g of ammonium sulfate for foaming treatment. During the foaming process, stir at a stirring speed of 300r / min for 10min. Then reduce the speed and stir at 170r / min for 15min to homogenize the foam. After homogenization, add 1g of zinc oxide at a stirring speed of 170r / min. After stirring for about 1min, add 0.2g of sodium fluorosilicate. Stir until the gel point is reached and immediately pour into a mold. Place in a 100℃ environment to set for 20min. Finally, vulcanize in a boiling water bath at 100℃ for 1h, wash with water to demold, and dry to obtain the anti-mildew sponge material. Example

[0028] The anti-mildew sponge material comprises the following raw materials by weight: 120g natural latex, 3g sulfur, 2.2g accelerator, 2.2g potassium oleate, 2.4g ammonium sulfate, 3g zinc oxide, 0.6g sodium fluorosilicate, 6g pineapple leaf fiber, and 1.6g potassium hydroxide.

[0029] The accelerators include zinc diethyldithiocarbamate and 2-mercaptobenzothiazole, and the mass ratio of zinc diethyldithiocarbamate to 2-mercaptobenzothiazole is 1:0.6.

[0030] The preparation method of the accelerator includes the following steps: Zinc diethyldithiocarbamate and 2-mercaptobenzothiazole were mixed and stirred evenly to obtain an accelerator.

[0031] The preparation method of anti-mildew sponge material includes the following steps: S1. Mix 3g sulfur, 2.2g accelerator, 6g pineapple leaf fiber, 1.6g potassium hydroxide, 3g sodium caseinate aqueous solution (sodium caseinate aqueous solution has a mass concentration of 10%) and 16g deionized water, and stir evenly to obtain a mixed dispersion. S2. Mix 120g of natural latex and the mixed dispersion and cure at 25℃ for 24h. Then add 2.2g of potassium oleate and 2.4g of ammonium sulfate for foaming treatment. During the foaming process, stir at a stirring speed of 300r / min for 10min. Then reduce the speed and stir at 170r / min for 15min to homogenize the foam. After homogenization, add 3g of zinc oxide at a stirring speed of 170r / min. After stirring for about 1min, add 0.6g of sodium fluorosilicate. Stir until the gel point is reached and immediately pour into a mold. Place in a 100℃ environment for setting for 20min. Finally, vulcanize in a boiling water bath at 100℃ for 1h. Wash, demold, and dry to obtain the anti-mildew sponge material. Example

[0032] The anti-mildew sponge material includes the following raw materials by weight: 110g natural latex, 2g sulfur, 1.8g accelerator, 2.0g potassium oleate, 2.3g ammonium sulfate, 2g zinc oxide, 0.4g sodium fluorosilicate, 4g pineapple leaf fiber, and 1.2g potassium hydroxide.

[0033] The accelerators include zinc diethyldithiocarbamate and 2-mercaptobenzothiazole, and the mass ratio of zinc diethyldithiocarbamate to 2-mercaptobenzothiazole is 1:0.6.

[0034] The preparation method of the accelerator includes the following steps: Zinc diethyldithiocarbamate and 2-mercaptobenzothiazole were mixed and stirred evenly to obtain an accelerator.

[0035] The preparation method of anti-mildew sponge material includes the following steps: S1. Mix 2g of sulfur, 1.8g of accelerator, 4g of pineapple leaf fiber, 1.2g of potassium hydroxide, 2g of sodium caseinate aqueous solution (the mass concentration of sodium caseinate aqueous solution is 10%) and 11g of deionized water, and stir evenly to obtain a mixed dispersion. S2. Mix 110g of natural latex and the mixed dispersion and cure at 25℃ for 24h. Then add 2.0g of potassium oleate and 2.3g of ammonium sulfate for foaming treatment. During the foaming process, stir at a stirring speed of 300r / min for 10min. Then reduce the speed and stir at 170r / min for 15min to homogenize the foam. After homogenization, add 2g of zinc oxide at a stirring speed of 170r / min. After stirring for about 1min, add 0.4g of sodium fluorosilicate. Stir until the gel point is reached and immediately pour into a mold. Place in a 100℃ environment for setting for 20min. Finally, vulcanize in a boiling water bath at 100℃ for 1h. Wash, demold, and dry to obtain the anti-mildew sponge material. Example

[0036] The difference between Example 4 and Example 3 is that the modified preparation method of pineapple leaf fiber includes the following steps: 10g of pineapple leaf fiber and 1g of epoxidized natural latex were mixed and stirred evenly to obtain modified pineapple leaf fiber. Example

[0037] The difference between Example 5 and Example 3 is that the modified preparation method of pineapple leaf fiber includes the following steps: 10g of pineapple leaf fiber and 5g of epoxidized natural latex were mixed and stirred evenly to obtain modified pineapple leaf fiber. Example

[0038] The difference between Example 6 and Example 3 is that the modified preparation method of pineapple leaf fiber includes the following steps: 10g of pineapple leaf fiber and 3g of epoxidized natural latex were mixed and stirred evenly to obtain modified pineapple leaf fiber. Example

[0039] The difference between Example 7 and Example 6 is that the mass ratio of pineapple leaf fiber to epoxidized natural latex is 1:0.01. Example

[0040] The difference between Example 8 and Example 6 is that the mass ratio of pineapple leaf fiber to epoxidized natural latex is 1:0.6. Example

[0041] The difference between Example 9 and Example 6 is that Example 9 also includes 1.6g of arginine.

[0042] The preparation method of anti-mildew sponge material includes the following steps: S1. Mix 2g sulfur, 1.8g accelerator, 4g pineapple leaf fiber, 1.6g arginine, 1.2g potassium hydroxide, 2g sodium caseinate aqueous solution (sodium caseinate aqueous solution mass concentration is 10%) and 11g deionized water, and stir evenly to obtain a mixed dispersion. S2. Mix 110g of natural latex and the mixed dispersion and cure at 25℃ for 24h. Then add 2.0g of potassium oleate and 2.3g of ammonium sulfate for foaming treatment. During the foaming process, stir at a stirring speed of 300r / min for 10min. Then reduce the speed and stir at 170r / min for 15min to homogenize the foam. After homogenization, add 2g of zinc oxide at a stirring speed of 170r / min. After stirring for about 1min, add 0.4g of sodium fluorosilicate. Stir until the gel point is reached and immediately pour into a mold. Place in a 100℃ environment for setting for 20min. Finally, vulcanize in a boiling water bath at 100℃ for 1h. Wash, demold, and dry to obtain the anti-mildew sponge material. Example

[0043] The difference between Example 10 and Example 9 is that Example 10 also includes 2g of arginine. Example

[0044] The difference between Example 11 and Example 9 is that Example 11 also includes 1.8g of arginine. Example

[0045] The difference between Example 12 and Example 11 is that the modified preparation method of arginine includes the following steps: 1g of arginine was added to 4g of MES buffer (the mass concentration of MES buffer was 21.3mg / mL), followed by 3.5g of 1-ethyl-(3-dimethylaminopropyl)carbodiimide and 1g of N-hydroxysuccinimide. After the reaction was complete, it was mixed with 1.2g of chitosan and stirred evenly to obtain modified arginine. Example

[0046] The difference between Example 13 and Example 11 is that the modified preparation method of arginine includes the following steps: 1g of arginine was added to 4g of MES buffer (the mass concentration of MES buffer was 21.3mg / mL), followed by 3.5g of 1-ethyl-(3-dimethylaminopropyl)carbodiimide and 1g of N-hydroxysuccinimide. After the reaction was complete, it was mixed with 1.6g of chitosan and stirred evenly to obtain modified arginine. Example

[0047] The difference between Example 14 and Example 11 is that the modified preparation method of arginine includes the following steps: 1g of arginine was added to 4g of MES buffer (MES buffer concentration was 21.3mg / mL), followed by 3.5g of 1-ethyl-(3-dimethylaminopropyl)carbodiimide and 1g of N-hydroxysuccinimide. After the reaction was complete, it was mixed with 1.4g of chitosan and stirred evenly to obtain modified arginine. Example

[0048] The difference between Example 15 and Example 14 is that the mass ratio of arginine to chitosan is 1:1. Example

[0049] The difference between Example 16 and Example 14 is that the mass ratio of arginine to chitosan is 1:1.8.

[0050] Comparative Example 1 The difference between Comparative Example 1 and Example 3 is that the anti-mildew sponge material does not contain pineapple leaf fibers.

[0051] The preparation method of anti-mildew sponge material includes the following steps: S1. Mix 2g of sulfur, 1.8g of accelerator, 1.2g of potassium hydroxide, 2g of sodium caseinate aqueous solution (the mass concentration of sodium caseinate aqueous solution is 10%) and 11g of deionized water, and stir evenly to obtain a mixed dispersion. S2. Mix 110g of natural latex and the mixed dispersion and cure at 25℃ for 24h. Then add 2.0g of potassium oleate and 2.3g of ammonium sulfate for foaming treatment. During the foaming process, stir at a stirring speed of 300r / min for 10min. Then reduce the speed and stir at 170r / min for 15min to homogenize the foam. After homogenization, add 2g of zinc oxide at a stirring speed of 170r / min. After stirring for about 1min, add 0.4g of sodium fluorosilicate. Stir until the gel point is reached and immediately pour into a mold. Place in a 100℃ environment for setting for 20min. Finally, vulcanize in a boiling water bath at 100℃ for 1h. Wash, demold, and dry to obtain the anti-mildew sponge material.

[0052] Performance testing: Antibacterial and antifungal properties were tested according to the test method in QB / T2591-2003.

[0053]

[0054] Data Analysis Specifically, the difference between Example 6 and Example 3 is that the antibacterial and anti-enzyme properties of Example 6 are superior to those of Example 3. The difference between Example 6 and Example 3 is that pineapple leaf fibers are blended with epoxidized natural latex, and epoxidized natural latex is used as a binder to connect pineapple leaf fibers and natural latex, thereby enhancing the dispersibility of pineapple leaf fibers and improving the anti-mildew and antibacterial properties of the sponge material.

[0055] Specifically, the difference between Example 11 and Example 6 is that the antibacterial and anti-enzyme properties of Example 11 are superior to those of Example 6. The difference between Example 11 and Example 6 is that arginine is added to the sponge material. Arginine has the effect of inhibiting bacterial growth. In addition, arginine can also form hydrogen bonds with pineapple leaf fibers, which has a positive effect on improving the stability of arginine in the sponge material, thereby improving the anti-mildew and antibacterial properties of the sponge material.

[0056] Specifically, the difference between Example 14 and Example 11 is that the antibacterial and anti-enzyme properties of Example 14 are better than those of Example 11. The difference between Example 14 and Example 11 is that arginine is treated with chitosan, which reduces the possibility of arginine self-polymerization. In addition, the guanidin group of arginine and the cationic group of chitosan have a synergistic effect, which enhances the antibacterial effect of modified arginine, thereby improving the antifungal and antibacterial properties of the sponge material.

[0057] Specifically, the difference between Example 3 and Comparative Example 1 is that the antibacterial and anti-enzyme properties of Example 3 are better than those of Comparative Example 1. The difference between Example 3 and Comparative Example 1 is that pineapple leaf fiber is added to the sponge material. Pineapple leaf fiber has the effect of inhibiting or even killing bacteria, thereby improving the anti-mildew and antibacterial properties of the sponge material.

[0058] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A mold resistant sponge material, characterized by: The raw materials include the following parts by weight: 100-120 parts natural latex, 1-3 parts sulfur, 1.5-2.2 parts accelerator, 1.8-2.2 parts potassium oleate, 2.2-2.4 parts ammonium sulfate, 1-3 parts zinc oxide, 0.2-0.6 parts sodium fluorosilicate, 2-6 parts pineapple leaf fiber, and 0.8-1.6 parts potassium hydroxide.

2. The anti-mildew sponge material according to claim 1, characterized in that: The method for preparing modified pineapple leaf fiber includes the following steps: Modified pineapple leaf fiber is prepared by mixing pineapple leaf fiber and epoxidized natural latex and stirring evenly.

3. The anti-mildew sponge material according to claim 2, characterized in that: The mass ratio of pineapple leaf fiber to epoxidized natural latex is 1:(0.1-0.5).

4. The anti-mildew sponge material according to claim 1, characterized in that: It also includes 1.6-2.0 parts of arginine.

5. The anti-mildew sponge material according to claim 4, characterized in that: The modified preparation method of arginine includes the following steps: Arginine was added to MES buffer, followed by 1-ethyl-(3-dimethylaminopropyl)carbodiimide and N-hydroxysuccinimide. After the reaction was complete, it was mixed with chitosan and stirred evenly to obtain modified arginine.

6. The anti-mildew sponge material according to claim 5, characterized in that: The mass ratio of arginine to chitosan is 1:(1.2-1.6).

7. The anti-mildew sponge material according to claim 1, characterized in that: The accelerators include zinc diethyldithiocarbamate and 2-mercaptobenzothiazole.

8. A method for preparing the anti-mildew sponge material as described in claim 1, characterized in that: Includes the following steps: S1. After mixing sulfur, accelerator, pineapple leaf fiber, potassium hydroxide, sodium caseinate aqueous solution and deionized water, stir evenly to obtain a mixed dispersion. S2. After mixing natural latex and the mixed dispersion, the mixture is cured. Potassium oleate and ammonium sulfate are added for foaming treatment. Then, the mixture is slowed down for foam homogenization treatment. After homogenization, zinc oxide is added. After stirring, sodium fluorosilicate is added. When the mixture reaches the gelation point, it is immediately poured into the mold. The process is carried out in sequence: shaping, vulcanization, water washing for demolding, and drying to obtain the mildew-resistant sponge material.

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