A plant extract herbal latex pillow and preparation method thereof

Abstract

The present invention discloses a plant-extracted herbal latex pillow, including a latex pillowcase and a latex pillow core filled in the latex pillowcase, wherein the raw materials of the latex pillow core mainly include natural latex and herbal fiber; the natural latex is processed to obtain a first foaming material and a second foaming material; the first foaming material is mixed with natural rubber by dopamine-modified graphene molecules, and the graphene molecules are silver-plated on the surface; the second foaming material is ripened by 2-thiol benzothiazole zinc salt and zinc diethyldithiocarbamate as accelerators to natural latex, and the first foaming material is added in batches during the foaming process. The present invention is used to improve the physical properties and antibacterial properties of the latex pillow.

Description

Technical Field

[0001] The invention relates to the technical field of latex pillows, in particular to a plant-extracted herbal latex pillow and a preparation method thereof. Background Art

[0002] A latex pillow is a pillow made of natural latex. It is extremely safe and has good antibacterial effects. This type of pillow is generally very breathable. When you lie on your back on the pillow, it will have a certain resilience to protect your neck. The shape is always well maintained and it can provide certain support for your neck. Among them, the main component of a latex pillow is natural latex, which is a natural material taken from the sap of rubber trees. The resulting product has the advantages of good elasticity, high strength, and high elongation.

[0003] At present, herbal fibers have been widely used as reinforcing fillers for thermoplastic polymer composites, and polymers are combined with abundant herbal fibers (such as jute fibers) and incorporated into natural latex foam composites. The technical development continues until herbal fibers are successfully combined with natural latex foam materials, but the physical properties and antibacterial properties are still the focus of technological breakthroughs. This application improves the physical properties and antibacterial properties of latex pillows prepared from herbal fiber / natural latex materials through the following technical solutions. Summary of the invention

[0004] The present application provides a plant-extracted herbal latex pillow and a preparation method thereof, which are used to improve the physical properties and antibacterial properties of the latex pillow.

[0005] The present application provides a plant-extracted herbal latex pillow, comprising a latex pillowcase and a latex pillow core filled in the latex pillowcase, wherein the raw materials of the latex pillow core mainly include natural latex and herbal fiber; the natural latex is processed to obtain a first foaming material and a second foaming material; the first foaming material is mixed with natural rubber through dopamine-modified graphene molecules, and the graphene molecules are silver-plated on the surface; the second foaming material is subjected to a aging treatment of natural latex by using 2-thiolbenzothiazole zinc salt and diethyldithiocarbamate zinc as promoters, and is added in batches to the first foaming material during the foaming process.

[0006] By adopting the above technical scheme, first of all, the first foaming material in this application, in which the graphene molecules are modified by dopamine and mixed with natural rubber, there are a large number of oxygen-containing groups on the surface of the graphene, which can interact with the natural rubber molecules through hydrogen bonds or ionic bonds; in addition, hydrogen bonds are formed between polydopamine and natural latex to make Ag-PDA-GO adsorbed on the surface of natural latex molecules. Among them, the graphene layer can form a firm interface with the natural latex, so that it has excellent physical properties and the air permeability of the natural latex material; and the silver ions react with the sulfhydryl groups in the bacteria through their own action to improve the antibacterial property, so as to improve the antibacterial property of the plant-extracted herbal latex pillow. In addition, the second foaming material uses 2-thiol benzothiazole zinc salt and diethyl dithiocarbamate zinc as accelerators to ripen the natural latex, which can not only reduce the requirements of time and temperature for vulcanization to improve efficiency, but also make the natural latex have a higher modulus and enhance the physical properties of the plant-extracted herbal latex pillow.

[0007] Preferably, the herbaceous fibers mainly include ramie fibers, hemp fibers, flax fibers and jute fibers; the herbaceous fibers are added in batches during the foaming process of the first foaming material.

[0008] By adopting the above technical solution, herbal biomass has aroused people's interest due to its species diversity, richness, low cost, light weight and sustainability. The addition of herbal fiber can improve the tensile strength, elongation at break and tensile strength of natural latex. In addition, the present application adds herbal fiber to the first foaming material in batches during the foaming process, so that the herbal fiber is evenly dispersed and the agglomeration phenomenon is reduced.

[0009] The herb fiber is treated with an alkali / silane coupling agent; the alkali treatment agent includes one or more of calcium hydroxide, sodium hydroxide, and potassium hydroxide; and the silane coupling agent includes one or more of vinyl triethoxy silane, vinyl trimethoxy silane, and vinyl tri(β-methoxyethoxy) silane.

[0010] By adopting the above technical solution, the surface chemical modification of the herbal fiber by combined treatment with alkali / silane coupling agent is helpful to improve the interaction between the herbal fiber and the natural latex matrix, thereby helping to increase the tensile strength and elongation at break.

[0011] On the other hand, the present application provides a method for preparing a plant-extracted herbal latex pillow, comprising the following steps: S1, pretreatment of natural latex: weighing a certain amount of natural latex in proportion for filtering, adding a certain mass of stabilizer to the natural latex, then slowly dripping formaldehyde solution to remove ammonia, and adding a certain amount of vulcanizing agent to obtain pretreated natural latex;

[0012] S2, preparation of the first foaming material: prepare a certain mass fraction of graphene aqueous solution and a certain mass fraction of dopamine solution in an alkaline environment, mix and stir, add silver nitrate solution after stirring, mix the solution in the pretreated natural latex, and obtain the first foaming material; S3, preparation of the second foaming material: slowly add the promoter 2-thiolbenzothiazole zinc salt and diethyldithiocarbamate zinc to the pretreated natural latex for aging, add a certain amount of antioxidant and stir to obtain the second foaming material; S4, pretreatment of herbaceous fiber: wash the herbaceous fiber with deionized water and put it in a drying oven, dry it at a certain temperature for a certain time, then put it in a grinder and grind it for a certain time, soak it in the alkali treatment agent for ultrasonic treatment, wash it with distilled water and neutralize it with acetic acid, then treat it with a silane coupling agent for a certain time, and finally distill water Wash and dry in a drying oven to obtain herbal fiber powder; S5, preparation of herbal fiber / natural latex material: add a certain mass fraction of potassium oleate solution to the first foaming material, and stir at a certain temperature and a certain stirring speed to perform a foaming operation, and at the same time add a certain mass of herbal fiber powder in batches during the stirring process, and add a certain amount of the second foaming material while adding the herbal fiber powder in each batch, and then reduce the foaming speed to obtain uniform foam, and finally add a certain amount of dispersion liquid and gelling agent to obtain a gel of the herbal fiber / natural latex material, which is then introduced into a mold and cured in a microwave drying oven to obtain the herbal fiber / natural latex material; S6, finishing of the plant-extracted herbal latex pillow: cool the herbal fiber / natural latex material, cut it, and finish it to obtain a latex pillow core, and place it in a latex pillowcase to obtain a plant-extracted herbal latex pillow.

[0013] Preferably, in the step of pretreating the natural latex, the raw materials of the vulcanizing agent mainly include casein protein, potassium hydroxide, sodium methylene bisnaphthalene sulfonate and sulfur powder.

[0014] By adopting the above technical solution, the vulcanization process forms cross-links and chemical bonds between natural latex molecules, thereby transforming the dispersed latex molecules into a network structure. The vulcanizing agent configured in this application can promote the ring-opening reaction of sulfur molecules and accelerate the cross-linking speed of latex molecular chains.

[0015] Preferably, in the step of preparing the first foaming material: prepare a 0.5-3.0 mg / ml graphene aqueous solution, add a buffer Tris hydrochloride, adjust the pH to between 7.5-9.5, then add the prepared 1.0-3.0 mg / ml dopamine solution, mix and stir for 24-48 hours, perform post-treatment to remove impurities, and dropwise add a 0.1 / mol silver nitrate solution, mix and stir for 24-48 hours, wash and dry; finally, mix the solution with the pretreated natural latex, continue mixing and stirring for 12-24 hours, and obtain the first foaming material.

[0016] By adopting the above technical scheme, the graphene in the present application has a large specific surface area and can be used as an excellent carrier of silver ions, thereby realizing silver plating of the graphene molecules on the surface; and dopamine, as a multifunctional biological modifier, will form a dihydroxy substance through oxidative dehydrogenation and internal cyclization in an alkaline environment, and then form polydopamine through physical self-assembly or covalent polymerization and densely coat the surface of the graphene matrix, thereby realizing silver plating of the graphene surface. In the preparation of the first foaming material in the present application, the present application adjusts the pH therein to achieve the adsorption of Ag-PDA-GO on the surface of the natural latex molecules, thereby forming the first foaming material.

[0017] Preferably, in the step of preparing the second foaming material, the raw materials of the antioxidant mainly include N-phenyl-2-naphthylamine, N-phenyl-α-naphthylamine, N,N′-di(β-naphthyl)-p-phenylenediamine, N-(1,3-dimethylbutyl)-N′-phenyl-p-phenylenediamine, N-isopropyl-N′-phenyl-p-phenylenediamine and other additives, and the other additives include 10% casein solution, potassium hydroxide solution and diffusant sodium methylenebisnaphthalenesulfonate.

[0018] Preferably, during the preparation of the herbal fiber / natural latex material, a 20% concentration of potassium oleate solution is added to the first foaming material, and the foaming operation is performed at a stirring speed of 100-300rpm at 15-35°C for 6-10 hours. At the same time, herbal fiber powder is added in batches at intervals of 1 hour during the stirring process, and at the same time as each batch of herbal fiber powder is added, the second foaming material is added, and then the stirring speed is increased to 800-1200rpm. After 4-6 hours, the stirring speed is reduced to 100-200rpm to obtain uniform foam.

[0019] Preferably, during the stirring process, herbal fiber powder is added in batches at intervals of 1 hour, with a maximum of 5 batches added, and the second foaming material is added at the same time as each batch of herbal fiber powder is added; wherein the mass ratio of the herbal fiber powder to the first foaming material in each batch is 1-5:100; and the mass ratio of the second foaming material to the first foaming material in each batch is 2-10:100.

[0020] Preferably, in the preparation process of the herbal fiber / natural latex material, the main raw materials of the dispersion include zinc oxide and DGP; in the preparation process of the herbal fiber / natural latex material, the main raw materials of the gelling agent include sodium fluorosilicate.

[0021] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0022] 1. The present application adopts dopamine-modified graphene molecules mixed with natural rubber, and the graphene surface interacts with the natural rubber molecules through a large number of oxygen-containing groups; and hydrogen bonds are formed between polydopamine and natural latex to make the combination of dopamine and graphene adsorbed on the surface of natural latex molecules, thereby forming a firm interface with natural latex, so that it has excellent physical properties and excellent air permeability.

[0023] 2. The graphene used in the present application has a large specific surface area and can be used as an excellent carrier of silver ions, thereby achieving silver plating on the surface of graphene molecules; and dopamine, as a multifunctional biological modifier, will form a dihydroxy substance through oxidative dehydrogenation and internal cyclization in an alkaline environment, and then form polydopamine through physical self-assembly or covalent polymerization and densely coat the surface of the graphene matrix, thereby achieving silver plating on the graphene surface. Silver ions react with sulfhydryl groups in bacteria through their own action to improve the antibacterial property.

[0024] 3. The second foaming material used in the present application uses 2-thiolbenzothiazole zinc salt and diethyldithiocarbamate zinc as accelerators to mature natural latex, which can not only reduce the time and temperature requirements of vulcanization to improve efficiency, but also make natural latex have a higher modulus and enhance the physical properties of the plant-extracted herbal latex pillow.

[0025] 4. The present application uses the addition of herbal fibers to improve the tensile strength, elongation at break and tensile strength of natural latex, and the present application adds the herbal fibers to the first foaming material in batches during the foaming process, so that the herbal fibers are evenly dispersed and the agglomeration phenomenon is reduced. DETAILED DESCRIPTION

[0026] The present application provides a plant-extracted herbal latex pillow and a preparation method thereof, which are used to improve the physical properties and antibacterial properties of the latex pillow.

[0027] The following will be combined with the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0028] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or server that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or modules that are not clearly listed or inherent to these processes, methods, products, or devices.

[0029] raw material

[0030] Natural latex: Latex includes natural latex, synthetic latex and artificial latex; this application adopts the currently commercially available natural latex, which contains 27%-41.3% rubber component, 44%-70% water, 0.2%-4.5% protein, 2%-5% natural resin, 0.36%-4.2% sugar and ash impurities.

[0031] Herbaceous fiber: The herbaceous fiber used in this application includes ramie fiber, hemp fiber, flax fiber and jute fiber currently available on the market.

[0032] Dopamine: CAS No. 51-61-6, molecular weight 153.180, purity 98%;

[0033] Graphene: CAS No. 1034343-98-0, molecular weight 12.000 (single atom), purity 99%;

[0034] 2-Mercaptobenzothiazole zinc salt: CAS No. 155-04-4, molecular weight 397.896, purity 99%;

[0035] Zinc diethyldithiocarbamate: CAS No. 14324-55-1, molecular weight 361.948, purity 99%.

[0036] Example 1

[0037] S1, pretreatment of natural latex: weigh 1.0kg of natural latex according to proportion and filter it, add 100g of a certain mass of 10.0% casein solution (mainly composed of casein, borax and ammonia water) to the natural latex, then slowly drop 120ml of 5.0% formaldehyde solution to remove ammonia, and add a vulcanizing agent (mainly composed of casein protein, potassium hydroxide, sodium methylene bis naphthalene sulfonate and sulfur powder) to obtain pretreated natural latex;

[0038] S2. Preparation of the first foaming material: prepare a 2.0 mg / ml graphene aqueous solution, add buffer Tris hydrochloride, adjust the pH to 8.5, then add the prepared 2.0 mg / ml dopamine solution, mix and stir for 24 hours, and perform post-treatment to remove impurities, and simultaneously adhere polydopamine to the surface of graphene through oxidative polymerization of dopamine, and drop 0.1 / mol silver nitrate solution, then drop ammonia water, and mix and stir for 24 hours, observe that the color of the solution changes from colorless and transparent to turbid and finally to colorless, and then immerse in 10% calcium chloride-anhydrous ethanol solution, then wash and dry, take 50 g of the obtained concentrated solution and mix it in 500 g of pretreated natural latex, continue to mix and stir for 12 hours, and obtain the first foaming material.

[0039] S3, preparation of the second foaming material: 500g of pretreated natural latex is slowly added with an accelerator, wherein 5.0g of 2-thiolbenzothiazole zinc salt (50% casein solution) and 5.0g of zinc diethyldithiocarbamate (50% casein solution) are ripened, and 2.5g of an antioxidant N-phenyl-2-naphthylamine solution (mainly comprising N-phenyl-2-naphthylamine, 10% casein solution, potassium hydroxide solution and a diffusant sodium methylenebisnaphthalenesulfonate) is added and stirred to obtain a second foaming material;

[0040] S4. Pretreatment of herbaceous fiber: 500 g of ramie fiber was washed with deionized water and placed in a drying oven, dried at 80°C for 12 h, then placed in a pulverizer and pulverized for 3 h, then immersed in an alkali treatment agent (1 wt% calcium hydroxide solution) and ultrasonically treated for 1 h, and then washed with distilled water and neutralized with acetic acid until the fiber surface was completely free of unreacted alkali, and the ramie fiber was washed with distilled water again, and then ultrasonically treated with 1 wt% vinyl triethoxysilane (mainly comprising vinyl triethoxysilane, deionized water and ethanol) for 1 h, finally washed with distilled water, and dried in a drying oven at 80°C for 24 h to obtain herbaceous fiber powder;

[0041] S5. Preparation of herbal fiber / natural latex material: Add 20% concentration of potassium oleate solution to 100g of the first foaming material, and stir at a stirring speed of 200rpm at 25°C to perform foaming operation for 6h. At the same time, add 1g of ramie fiber powder in batches 5 times every 1h during the stirring process, and at the same time as the ramie fiber powder is added in batches, add 2g of the second foaming material 5 times, then increase the stirring speed to 800rpm. After 4h, reduce the stirring speed to 100rpm to obtain uniform foam.

[0042] Finally, a certain amount of dispersion liquid (mainly comprising zinc oxide and DGP) and gelling agent (mainly comprising 25% sodium fluorosilicate solution) are added to obtain a gel of the herbal fiber / natural latex material, which is then introduced into a mold and cured in a microwave drying oven for 2 hours to obtain a ramie fiber / natural latex material;

[0043] S6. Finishing of the plant-extracted herbal latex pillow: cooling the herbal fiber / natural latex material, cutting it, and finishing it to obtain a latex pillow core, and placing it in a latex pillowcase to obtain a plant-extracted herbal latex pillow.

[0044] Example 2

[0045] The difference between Example 2 and Example 1 is that the herbal fiber is selected differently, and hemp fiber is used.

[0046] Example 3

[0047] The difference between Example 3 and Example 1 is that the herbal fiber is selected differently, and flax fiber is used.

[0048] Example 4

[0049] The difference between Example 4 and Example 1 is that the herbal fiber is selected differently, and jute fiber is used.

[0050] Example 5

[0051] The difference between Example 5 and Example 1 is that in the alkali / silane coupling agent combined treatment process, the alkali treatment agent and the silane coupling agent are selected differently. The alkali treatment agent used in Example 5 is sodium hydroxide; and the silane coupling agent used is vinyltrimethoxysilane.

[0052] Example 6

[0053] The difference between Example 6 and Example 1 is that in the alkali / silane coupling agent combined treatment process, the alkali treatment agent and the silane coupling agent are selected differently. The alkali treatment agent used in Example 5 is potassium hydroxide; and the silane coupling agent used is vinyl tris(β-methoxyethoxy)silane.

[0054] Comparative Example

[0055] Comparative Example 1

[0056] The difference between Comparative Example 1 and Example 1 is that the first foaming material in Comparative Example 1 is not mixed with natural rubber through dopamine-modified graphene molecules, and silver ions are added to the first foaming material after vulcanization, and then the foaming operation is performed.

[0057] Pretreatment of natural latex and preparation of the first foaming material:

[0058] 1.0 kg of natural latex is weighed in proportion for filtering treatment, and a certain mass of 100 g of a 10.0% casein solution (mainly composed of casein, borax, and ammonia water) is added to the natural latex, followed by slowly dropping 120 ml of a 5.0% formaldehyde solution to remove ammonia, and adding a vulcanizing agent (mainly composed of casein protein, potassium hydroxide, sodium methylenebisnaphthalene sulfonate, and sulfur powder) to obtain pretreated natural latex;

[0059] Take 500g of pretreated natural latex, add 0.1 / mol silver nitrate solution, then add ammonia water, and mix and stir for 24 hours. Then, soak it in 10% calcium chloride-anhydrous ethanol solution, then wash and dry it. Take 50g of the obtained concentrated solution and mix it in 500g of pretreated natural latex. Continue mixing and stirring for 12 hours to obtain a first foaming material.

[0060] Comparative Example 2

[0061] The difference between Comparative Example 2 and Example 1 is that the first foaming material in Comparative Example 2 is mixed with natural rubber by dopamine-modified graphene molecules, but the graphene molecules are not silver-plated on the surface.

[0062] Pretreatment of natural latex and preparation of the first foaming material:

[0063] 1.0 kg of natural latex is weighed in proportion for filtering treatment, and a certain mass of 100 g of a 10.0% casein solution (mainly composed of casein, borax, and ammonia water) is added to the natural latex, followed by slowly dropping 120 ml of a 5.0% formaldehyde solution to remove ammonia, and adding a vulcanizing agent (mainly composed of casein protein, potassium hydroxide, sodium methylenebisnaphthalene sulfonate, and sulfur powder) to obtain pretreated natural latex;

[0064] A 2.0 mg / ml graphene aqueous solution was prepared, and a buffer Tris hydrochloride was added to adjust the pH to 8.5. Then, the prepared 2.0 mg / ml dopamine solution was added and mixed and stirred for 24 hours. Post-treatment was performed to remove impurities. 50 g of the mixed solution was added to 500 g of pretreated natural latex, and the mixing and stirring was continued for 12 hours to obtain a first foaming material.

[0065] Comparative Example 3

[0066] The difference between Comparative Example 3 and Example 1 is that in Comparative Example 3, the natural latex is not separated into the first foaming material and the second foaming material. 1.0 kg of natural latex is weighed in proportion for filtration treatment, and a certain mass of 100 g of 10.0% casein solution (mainly composed of casein, borax, and ammonia water) is added to the natural latex, and then 120 ml of 5.0% formaldehyde solution is slowly added dropwise to remove ammonia, and a vulcanizing agent (mainly composed of casein protein, potassium hydroxide, sodium methylenebisnaphthalene sulfonate, and sulfur powder) is added to obtain pretreated natural latex; then a 2.0 mg / ml graphene aqueous solution is prepared and a buffer Tris hydrochloric acid is added. Salt, adjust the pH to 8.5, then add the prepared 2.0 mg / ml dopamine solution and mix and stir for 24 hours, and perform post-treatment to remove impurities, adhere polydopamine to the surface of graphene through oxidative polymerization of dopamine, and drop 0.1 / mol silver nitrate solution, then drop ammonia water, and mix and stir for 24 hours, observe that the color of the solution changes from colorless and transparent to turbid and finally to colorless, then immerse in 10% calcium chloride-anhydrous ethanol solution, then wash and dry, take 50g of the obtained concentrated solution and mix it in 500g of pretreated natural latex, continue to mix and stir for 12 hours, and obtain the first modified natural latex;

[0067] Then, 5.0 g of 2-thiolbenzothiazole zinc salt (50% casein solution) and 5.0 g of zinc diethyldithiocarbamate (50% casein solution) are added to the modified natural latex for aging, and 2.5 g of an antioxidant N-phenyl-2-naphthylamine solution (mainly comprising N-phenyl-2-naphthylamine, 10% casein solution, potassium hydroxide solution and a diffusant sodium methylenebisnaphthalenesulfonate) is added for stirring to obtain a second modified natural latex;

[0068] Take 110g of the second modified natural latex, add 20% concentration of potassium oleate solution, and stir at 200rpm for foaming operation at 25°C for 6h. At the same time, add 1g of ramie fiber powder in batches 5 times, then increase the stirring speed to 800rpm. After 4h, reduce the stirring speed to 100rpm and obtain uniform foam.

[0069] Finally, a certain amount of dispersion liquid (main components include zinc oxide, DGP) and gelling agent (main component includes 25% sodium fluorosilicate solution) are added to obtain the gel of ramie fiber / natural latex material, which is then introduced into a mold and cured in a microwave drying oven for 2 hours to obtain the herbal fiber / natural latex material.

[0070] Comparative Example 4

[0071] The difference between Comparative Example 4 and Example 1 is that in Comparative Example 4, the second foaming material and the ramie fiber powder are not added in batches during the foaming process of the first foaming material.

[0072] Preparation of herbal fiber / natural latex material:

[0073] A 20% potassium oleate solution was added to 100g of the first foaming material, and the foaming operation was carried out for 6h at a stirring speed of 200rpm at 25°C. At the same time, 5g of ramie fiber powder and 10g of the second foaming material were added before the stirring process, and then the stirring speed was increased to 800rpm for 4h, and then the stirring speed was reduced to 100rpm to obtain uniform foam. Finally, a certain amount of dispersion liquid (mainly comprising zinc oxide and DGP) and gelling agent (mainly comprising 25% sodium fluorosilicate solution) were added to obtain a gel of the herbal fiber / natural latex material, which was then introduced into a mold and cured in a microwave drying oven for 2h to obtain the ramie fiber / natural latex material.

[0074] Comparative Example 5

[0075] The difference between Comparative Example 5 and Example 1 is that no ramie fiber is added in the preparation of the herb fiber / natural latex material.

[0076] A 20% potassium oleate solution was added to 100g of the first foaming material, and the foaming operation was carried out for 6 hours at a stirring speed of 200rpm at 25°C. At the same time, 10g of the second foaming material was added before the stirring process, and then the stirring speed was increased to 800rpm for 4 hours, and then the stirring speed was reduced to 100rpm to obtain uniform foam. Finally, a certain amount of dispersion liquid (mainly comprising zinc oxide and DGP) and gelling agent (mainly comprising 25% sodium fluorosilicate solution) were added to obtain a gel of the herbal fiber / natural latex material, which was then introduced into a mold and cured in a microwave drying oven for 2 hours to obtain a ramie fiber / natural latex material.

[0077] Performance testing

[0078] In order to further study the effects of various components and preparation parameters on the plant-extracted herbal latex pillow, the present application further carries out the following examples for verification.

[0079] According to Examples 1-6 and Comparative Examples 1-5, the plant-extracted herbal latex pillows prepared in each Example and each Comparative Example were subjected to antibacterial tests, silver ion dissolution tests after washing, and tests on various physical properties.

[0080] 1. Antibacterial performance test: The test was carried out in accordance with GB / T20944.3-2008 "Evaluation of antibacterial properties of textiles Part 3: Oscillation method", with Escherichia coli, Candida albicans and Staphylococcus aureus as test strains, and the cured herbal fiber / natural latex material was cut to test its antibacterial effect.

[0081] 2. Detection of silver ion dissolution results: Immerse the herbal fiber / natural latex material in deionized water at 25°C for 48 hours. The OEKO-TEX standard is used as the test procedure. The test instrument uses plasma atomic emission spectrometry to detect the silver ion content dissolved in deionized water.

[0082] 3. Physical properties testing: According to the national standard HG / T 5644-2019 testing standards, including apparent density, compression permanent deformation, compression hardness and moisture content.

[0083] The test results are integrated into the following table.

[0084] Table 1, Performance test table of Examples 1-4 and Comparative Examples 1-4

[0085]

[0086] Antibacterial performance test: Unit: %, (Escherichia coli ATCC 8099, Candida albicans ATCC 10231 and Staphylococcus aureus ATCC 6538)

[0087] Conclusion Analysis

[0088] Antibacterial performance and silver ion dissolution detection and analysis:

[0089] Through the antibacterial performance test and analysis of Examples 1-6, in Example 3, when the herbal fiber is flax fiber, the alkali treatment agent is calcium hydroxide, and the silane coupling agent is vinyl triethoxysilane, it has a good antibacterial effect compared with other examples, and no silver ion dissolution is detected in all examples.

[0090] In addition, according to the analysis of Example 3 and Comparative Example 1, the first foaming material in Comparative Example 1 is not mixed with natural rubber by dopamine-modified graphene molecules, and silver ions are added to the first foaming material after vulcanization, and then the foaming operation is entered. Among them, the antibacterial effect is reduced, and a large amount of silver ions are dissolved in the test. This is because graphene has a large specific surface area and can be used as an excellent carrier of silver ions, thereby realizing the silver plating of graphene molecules on the surface; and dopamine, as a multifunctional biological modifier, will form a dihydroxy substance through oxidative dehydrogenation and internal cyclization in an alkaline environment, and then form polydopamine through physical self-assembly or covalent polymerization and densely coat the surface of the graphene matrix, thereby realizing the silver plating of the graphene surface. Therefore, dopamine-modified graphene molecules are not mixed with natural rubber in Comparative Example 1, so silver ions will be dissolved in large quantities.

[0091] In addition, the analysis of Comparative Example 2, Comparative Example 1 and Example 3 shows that in Comparative Example 2, dopamine-modified graphene molecules are mixed with natural rubber, but the graphene molecules are not silver-plated on the surface. Therefore, its antibacterial effect is far inferior to that of Comparative Example 1 and Example 3. In addition, since the graphene molecules are not silver-plated on the surface in Comparative Example 2, a large amount of silver ion dissolution is not detected.

[0092] Physical performance testing and analysis:

[0093] Through the physical property analysis of Examples 1-6, in Example 4, when the herbal fiber is jute fiber, the alkali treatment agent is calcium hydroxide, and the silane coupling agent is vinyl triethoxysilane, it has good physical properties compared with other examples. The apparent density, compression permanent deformation, compression hardness and moisture content of the latex pillows in all examples meet the national standard HG / T 5644-2019.

[0094] Therefore, the experimental analysis shows that the surface chemical modification of herbal fibers by combined treatment with alkali / silane coupling agents helps to improve the interaction between herbal fibers and the natural latex matrix, thereby helping to increase physical properties such as tensile strength and elongation at break.

[0095] Comparative Examples 1 and 2 are compared with Example 4. The first foaming material in Comparative Example 1 is not mixed with natural rubber by dopamine-modified graphene molecules. Comparative Example 2 is mixed with natural rubber by dopamine-modified graphene molecules, but the graphene molecules are not silver-plated on the surface. The physical properties of Comparative Example 1 are much lower than those of Comparative Example 2 and Example 4, which is due to the mixing of dopamine-modified graphene molecules with natural rubber. A large number of oxygen-containing groups on the surface of graphene interact with natural rubber molecules; and hydrogen bonds are formed between polydopamine and natural latex to make the combination of dopamine and graphene adsorbed on the surface of natural latex molecules, thereby forming a firm interface with natural latex, so that it has excellent physical properties.

[0096] In addition, by comparing comparative examples 3 and 4 with example 4, it can be found that the addition of herbal fibers can improve the tensile strength, elongation at break and tensile strength of natural latex. By adding herbal fibers to the first foaming material in batches during the foaming process, the herbal fibers are evenly dispersed, reducing the occurrence of agglomeration, which helps to improve the physical properties of the latex pillow. In addition, according to the comparative analysis of comparative example 5 and example 4, the addition of herbal fibers can improve the physical properties of natural latex.

[0097] It should be noted that in the present application, in the preparation of the herbal fiber / natural latex material, the herbal fiber powder is added in batches every 1 hour during the stirring process, and a maximum of 5 batches are added, and the second foaming material is added at the same time as the herbal fiber powder is added in each batch; wherein the mass ratio of each batch of herbal fiber powder to the first foaming material is 1-5:100; and the mass ratio of each batch of the second foaming material to the first foaming material is 2-10:100. The preferred result obtained in the present application is: wherein the mass ratio of each batch of herbal fiber powder to the first foaming material is 3:100; and the mass ratio of each batch of the second foaming material to the first foaming material is 5:100.

[0098] That is, in the preparation of herbal fiber / natural latex materials:

[0099] The first foaming material of 100g is added with a potassium oleate solution of 20% concentration, and the stirring speed of 200rpm is stirred at 25 ℃ for 6h to perform a foaming operation, and the powder of 3g of jute fiber is added in batches every 1h during the stirring process, and the powder of ramie fiber is added in each batch, and the second foaming material of 5g is added 5 times, and then the stirring speed is increased to 800rpm after 4h, and the stirring speed is reduced to 100rpm, and uniform foam is obtained. Finally, a certain amount of dispersion liquid (main component includes zinc oxide, DGP) and gelling agent (main component includes 25% sodium fluorosilicate solution) are added to obtain the gel of herbal fiber / natural latex material, which is then introduced into a mold and cured in a microwave drying oven for 2h to obtain jute fiber / natural latex material. The latex pillow prepared by the jute fiber / natural latex material has good physical properties.

[0100] In addition, the present application also optimizes the raw materials of the vulcanizing agent in the preparation process of the latex pillow, wherein the raw materials of the vulcanizing agent mainly include casein protein, potassium hydroxide, sodium methylene bis naphthalene sulfonate and sulfur powder. Through vulcanization, cross-linking and chemical bonds are formed between natural latex molecules, thereby converting the dispersed latex molecules into a network structure. The vulcanizing agent configured in the present application can promote the ring-opening reaction of sulfur molecules and accelerate the cross-linking speed of latex molecular chains.

[0101] In the step of preparing the second foaming material, the raw material ratio of the antioxidant is optimized, wherein the antioxidants are selected from N-phenyl-2-naphthylamine, N-phenyl-α-naphthylamine, N,N′-di(β-naphthyl)-p-phenylenediamine, N-(1,3-dimethylbutyl)-N′-phenyl-p-phenylenediamine, and N-isopropyl-N′-phenyl-p-phenylenediamine. The antioxidant is selected as N-phenyl-2-naphthylamine and is combined with auxiliary agents to make the latex pillow have a good antioxidant effect, wherein the auxiliary agents include 10% casein solution, potassium hydroxide solution, and a diffusant, sodium methylenebisnaphthalenesulfonate.

[0102] It should be noted that the above-mentioned sequence of the embodiments of the present application is only for description and does not represent the advantages and disadvantages of the embodiments. And the above-mentioned specific embodiments of this specification are described. Other embodiments are within the scope of the attached claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0103] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

[0104] This specification is merely an exemplary description of the present application and is deemed to have covered any and all modifications, variations, combinations or equivalents within the scope of the present application. Obviously, those skilled in the art may make various modifications and variations to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the present application and its equivalents, the present application is intended to include these modifications and variations.

Claims

1. A plant extract herbal latex pillow, characterized in that: It comprises a latex pillowcase and a latex pillow core filled in the latex pillowcase, wherein the raw materials of the latex pillow core include natural latex and herbal fiber; The natural latex is processed to obtain a first foaming material and a second foaming material, comprising the following steps: weighing a certain amount of natural latex in proportion for filtering, adding a certain amount of stabilizer to the natural latex, then slowly dropping a formaldehyde solution to remove ammonia, and adding a certain amount of vulcanizing agent to obtain pretreated natural latex; A graphene aqueous solution with a certain mass fraction is prepared and mixed with a dopamine solution with a certain mass fraction in an alkaline environment, and after stirring, a silver nitrate solution is added dropwise, and the solution is mixed with the pretreated natural latex to obtain the first foaming material; Slowly adding accelerators 2-thiolbenzothiazole zinc salt and zinc diethyldithiocarbamate to the pretreated natural latex for aging, and adding a certain amount of antioxidant for stirring to obtain the second foaming material; The herbal fiber is treated with alkali and silane coupling agent; the herbal fiber is added in batches during the foaming process of the first foaming material.

2. The plant-extracted herbal latex pillow according to claim 1, characterized in that: The herbal fibers include ramie fibers, hemp fibers, flax fibers and jute fibers.

3. The plant-extracted herbal latex pillow according to claim 2, characterized in that: The alkali includes one or more of calcium hydroxide, sodium hydroxide, and potassium hydroxide; the silane coupling agent includes one or more of vinyl triethoxy silane, vinyl trimethoxy silane, and vinyl tri (β-methoxyethoxy) silane.

4. A method for preparing a plant-extracted herbal latex pillow as claimed in any one of claims 1 to 3, characterized in that: The steps include: S1. Pretreatment of natural latex: weigh a certain amount of natural latex according to a certain proportion for filtering, add a certain amount of stabilizer to the natural latex, then slowly drop a formaldehyde solution to remove ammonia, and add a certain amount of vulcanizing agent to obtain pretreated natural latex; S2, preparation of the first foaming material: preparing a graphene aqueous solution with a certain mass fraction and mixing it with a dopamine solution with a certain mass fraction in an alkaline environment, stirring, adding a silver nitrate solution dropwise after stirring, and mixing the solution with the pretreated natural latex to obtain the first foaming material; S3, preparation of the second foaming material: slowly adding accelerators 2-thiolbenzothiazole zinc salt and zinc diethyldithiocarbamate to the pretreated natural latex for aging, and adding a certain amount of antioxidant for stirring to obtain the second foaming material; S4, pretreatment of herb fiber: washing the herb fiber with deionized water and placing it in a drying oven, drying it at a certain temperature for a certain time, then placing it in a pulverizer for a certain time, soaking it in the alkali treatment agent for ultrasonic treatment, washing it with distilled water and neutralizing it with acetic acid, then treating it with a silane coupling agent for a certain time, finally washing it with distilled water, and drying it in a drying oven to obtain herb fiber powder; S5. Preparation of herbal fiber / natural latex material: adding a certain mass fraction of potassium oleate solution to the first foaming material, and stirring at a certain temperature and a certain stirring speed to perform a foaming operation, while adding a certain mass of herbal fiber powder in batches during the stirring process, and adding a certain amount of the second foaming material while adding the herbal fiber powder in each batch, and then reducing the foaming speed to obtain uniform foam, and finally adding a certain amount of dispersing liquid and gelling agent to obtain a gel of the herbal fiber / natural latex material, which is then introduced into a mold and cured in a microwave drying oven to obtain the herbal fiber / natural latex material; S6. Finishing of the plant-extracted herbal latex pillow: cooling, cutting, and finishing the herbal fiber / natural latex material to obtain a latex pillow core, and placing it in a latex pillowcase to obtain a plant-extracted herbal latex pillow.

5. The method for preparing the plant-extracted herbal latex pillow according to claim 4, characterized in that: In the step of pre-treating the natural latex, the raw materials of the vulcanizing agent include casein protein, potassium hydroxide, sodium methylene bisnaphthalene sulfonate and sulfur powder.

6. The method for preparing the plant-extracted herbal latex pillow according to claim 4, characterized in that: In the step of preparing the first foaming material: prepare a 0.5-3.0 mg / ml graphene aqueous solution, add a buffer Tris hydrochloride, adjust the pH between 7.5-9.5, then add the prepared 1.0-3.0 mg / ml dopamine solution, mix and stir for 24-48 hours, perform post-treatment to remove impurities, and dropwise add a 0.1 / mol silver nitrate solution, mix and stir for 24-48 hours, wash and dry; finally, mix the solution with the pretreated natural latex, continue mixing and stirring for 12-24 hours, and obtain the first foaming material.

7. The method for preparing the plant-extracted herbal latex pillow according to claim 4, characterized in that: In the step of preparing the second foaming material, the raw materials of the antioxidant include N-phenyl-2-naphthylamine, N-phenyl-α-naphthylamine, N,N′-di(β-naphthyl)-p-phenylenediamine, N-(1,3-dimethylbutyl)-N′-phenyl-p-phenylenediamine, N-isopropyl-N′-phenyl-p-phenylenediamine and other additives, and the other additives include 10% casein solution, potassium hydroxide solution and diffusant sodium methylenebisnaphthalenesulfonate.

8. The method for preparing the plant-extracted herbal latex pillow according to claim 4, characterized in that: During the preparation of the herbal fiber / natural latex material, a 20% concentration of potassium oleate solution is added to the first foaming material, and the foaming operation is performed at a stirring speed of 100-300rpm at 15-35°C for 6-10 hours. At the same time, herbal fiber powder is added in batches every 1 hour during the stirring process, and at the same time as each batch of herbal fiber powder is added, the second foaming material is added, and then the stirring speed is increased to 800-1200rpm. After 4-6 hours, the stirring speed is reduced to 100-200rpm to obtain uniform foam.

9. The method for preparing the plant-extracted herbal latex pillow according to claim 8, characterized in that: During the stirring process, the herbal fiber powder is added in batches every 1 hour, and a maximum of 5 batches are added, and the second foaming material is added at the same time as each batch of herbal fiber powder is added; The mass ratio of the herbal fiber powder to the first foaming material in each batch is 1-5:100; the mass ratio of the second foaming material to the first foaming material in each batch is 2-10:

100.

10. The method for preparing the plant-extracted herbal latex pillow according to claim 4, characterized in that: In the preparation process of the herbal fiber / natural latex material, the raw materials of the dispersion liquid include zinc oxide and DGP; in the preparation process of the herbal fiber / natural latex material, the raw materials of the gelling agent include sodium fluorosilicate.

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