Preparation and application of hydrophilic PU bamboo charcoal dead sea salt self-cleaning bath sponge

Abstract

The invention relates to the technical field of nursing materials, in particular to preparation and application of hydrophilic PU bamboo charcoal dead sea salt self-cleaning bath sponge which is prepared by mixing and foaming a component A and a component B at a high speed. The material A is a water-based emulsified material and comprises the following components in parts by weight: 55-75 parts of water, 1-3 parts of a pore opening agent, 10-15 parts of a surfactant, 0.2-0.5 part of aloe essence, 5-8 parts of glycerol, 6-10 parts of a self-emulsifying agent, 6-8 parts of dead sea salt, 4-7 parts of bamboo charcoal powder and 0.1-0.3 part of nano silver ions; and the material B is hydrophilic polyurethane. A component A and a component B are mixed at a high speed according to a certain proportion through a double-component polyurethane foaming machine, foaming and drying are conducted, the surface of a product is smooth, the interior of the product is of a honeycomb structure, and rich foam can be released when the product is cleaned; the product has the characteristics that the product has a bath cleaning function, the bamboo charcoal / dead sea salt improves the skin surface, the product is easy to degrade after being abandoned, and the nano silver ions serving as the antibacterial agent are efficient and durable.

Description

Technical Field

[0001] This invention relates to the field of nursing care products technology, specifically to the preparation and application of a hydrophilic PU bamboo charcoal Dead Sea salt self-cleaning bath sponge. Background Technology

[0002] In recent years, with the rapid development of the bath sponge market, domestic and international consumers have paid more attention to the environmental protection and health aspects of bath sponges, and consequently have higher requirements for the quality of bath sponges, pursuing high-end products. Therefore, the market for new types of bath sponges has huge growth potential.

[0003] Currently, the main materials used for bath sponges in China are polyvinyl alcohol (PVA) synthetic sponges, polyethylene (PE) or nylon (PA) bath balls, and natural wood pulp synthetic sponges. The production process relies on chemical foaming agents such as azodicarbonamide, which results in a degradation cycle of more than 5 years in the natural environment after the product is discarded. In addition, the residue of chemical foaming agents can easily cause skin irritation. Furthermore, the products do not integrate the skin care function of natural ingredients and lack a continuous antibacterial mechanism. After long-term use, bacteria can easily grow and produce odors, affecting the user experience. Summary of the Invention

[0004] To address the technical problems existing in the prior art, this invention proposes the preparation and application of a hydrophilic PU bamboo charcoal Dead Sea salt self-cleaning bath sponge, which is made by mixing, foaming and drying two-component polyurethane foaming machine. It has a smooth surface, a honeycomb structure, and rich foam; it is self-cleaning, has skin-care properties with bamboo charcoal and Dead Sea salt, is easily degradable, and has highly effective and long-lasting antibacterial properties with nano-silver.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A hydrophilic PU bamboo charcoal Dead Sea salt self-cleaning bath sponge is made of two components, A and B, through high-speed mixing and foaming. Component A is an aqueous emulsifying material, comprising, by weight: 55-75 parts water, 1-3 parts pore-opening agent, 10-15 parts surfactant, 0.2-0.5 parts aloe vera extract, 5-8 parts glycerin, 6-10 parts self-emulsifier, 6-8 parts Dead Sea salt, 4-7 parts bamboo charcoal powder, and 0.1-0.3 parts nano silver ions. Component B is hydrophilic polyurethane.

[0006] Furthermore, the surfactant is amamidopropyl hydroxysulfonyl benzoyl alkaloid with a purity of ≥98%, and the hydrophilic polyurethane has a hydroxyl value of 350-450 mg KOH / g and a moisture content of ≤0.1%.

[0007] Furthermore, the bamboo charcoal powder is nano bamboo charcoal with a particle size of 200-500 mesh and a specific surface area of ​​≥800m² / g; the Dead Sea salt is activated by calcination at 300-500℃ and has a magnesium content of ≥12% and a bromine content of ≥0.5%; the nano silver ions are spherical silver nanoparticles with a particle size of 10-20nm and their surface is modified with polyvinylpyrrolidone.

[0008] Furthermore, the hydrophilic polyurethane has a hydroxyl value of 350-450 mgKOH / g and a moisture content of ≤0.1%. The hydrophilic polyurethane is prepared by a prepolymerization reaction of polyether polyol and isocyanate, wherein the molecular weight of the polyether polyol is 2000-3000.

[0009] Furthermore, the self-emulsifier is sodium cocoyl ethyl sulfonate, with an active ingredient content ≥90%; the aloe vera extract is prepared by vacuum concentration of aloe vera leaf extract, with a solid content ≥10%; the glycerin has a purity ≥99.5% and a moisture content ≤0.2%.

[0010] Furthermore, in the A material, the weight ratio of bamboo charcoal powder to Dead Sea salt is 4-7:6-8, the weight ratio of nano silver ions to surfactant is 0.1-0.3:10-15, and the amount of pore opener added is 1-3% of the total weight of the A material, in order to control the pore density and pore size distribution.

[0011] The preparation of a hydrophilic PU bamboo charcoal Dead Sea salt self-cleaning bath sponge includes the following steps: S1. Preparation of A material: Mix water, pore opener, surfactant, aloe vera extract, glycerin and self-emulsifier, emulsify at 100-200 r / min for 15-20 min, add Dead Sea salt, bamboo charcoal powder and nano silver ions, continue emulsification for 5-10 min, and control the temperature at room temperature; S2. Raw material preheating: Material A is kept at 12-18℃, and material B is preheated to 28-33℃; S3. Mixing and foaming: Materials A and B are fed to the machine head by a metering pump in a mass ratio of 1.2-1.5:1. They are stirred at high speed of 4000-6000r / min for 1-3s, with a mixing pressure of 0.4-0.8MPa. The mixture is then injected into a mold at 28-35℃ for foaming and shaping for 15-20min. S4. Drying and shaping: The shaped blank is dried at 40-50℃ and relative humidity ≤20% for 8-12 hours to obtain the finished product.

[0012] Furthermore, step S3 also includes injecting the mixed material into a mold for foaming and shaping. The temperature of the mold is controlled at 28-35℃, the foaming and shaping time is 15-20 minutes, and a honeycomb-shaped flow guiding structure is provided in the mold to guide the growth direction of the foam cells.

[0013] Furthermore, after step S3, a low-temperature drying step is also included: the foamed and shaped blank is placed in a drying oven and dried at a temperature of 40-50℃ for 8-12 hours. During the drying process, the relative humidity of the environment is controlled to be ≤20%, and heat is transferred in the drying oven by hot air circulation.

[0014] Furthermore, in step S3, the head device of the PU foaming machine includes a mixing chamber and a static mixer. The inner wall of the mixing chamber is provided with a spiral guide groove, and the static mixer has 8-12 units to enhance the radial mixing effect of the materials.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. In this invention, hydrophilic polyurethane is used to replace petroleum-based materials, and sodium bicarbonate-citric acid compound pore-opening agent is used to make the product's natural degradation rate ≥90% in 6 months, solving the problem of white pollution. In addition, natural ingredients such as bamboo charcoal powder and Dead Sea salt avoid the risk of chemical residues, and food-grade raw materials such as glycerin and aloe vera extract further enhance biological safety. This solves the problems of traditional bath sponges using petroleum-based materials, relying on chemical foaming agents, having a degradation cycle of more than 5 years, and having chemical residues that can easily cause skin irritation.

[0016] 2. In this invention, the combined action of nano-silver ions and Dead Sea salt results in a high inhibition rate of E. coli, thus solving the problem of bacterial growth; glycerin and aloe vera essence form a moisturizing layer, increasing skin hydration and alleviating dryness after use; the microporous structure of bamboo charcoal powder enhances adsorption capacity, and combined with the mineral friction particles of Dead Sea salt, the cleaning ability is improved compared to traditional products, solving the problems of traditional products that only clean through physical friction, lack additional functions such as antibacterial and moisturizing, and are prone to bacterial growth and dry skin with long-term use.

[0017] 3. In this invention, the honeycomb-shaped flow guiding structure of the mold, the temperature gradient between material A and material B, and the high-speed stirring parameters are used to achieve precise control of the cell diameter. The amount of opening agent added and the ratio of bamboo charcoal powder / Dead Sea salt are optimized to make the product durable for 40-60 cycles without damage, and its service life is twice that of traditional products. This solves the problem that the traditional stirring foaming process cannot accurately control the cell structure, resulting in water absorption rate fluctuation of ±20% and poor durability. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the preparation process in an embodiment of the present invention; Figure 2 This is a comparison table of embodiments in the present invention. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] like Figure 1 - Figure 2 The present invention is illustrated in detail with reference to a specific embodiment, but does not limit the scope of the claims of the present invention in any way.

[0021] A hydrophilic PU bamboo charcoal Dead Sea salt self-cleaning bath sponge is made of two components, A and B, through high-speed mixing and foaming. Component A is a water-based emulsifying material, comprising, by weight: 55-75 parts water, 1-3 parts pore-opening agent, 10-15 parts surfactant, 0.2-0.5 parts aloe vera extract, 5-8 parts glycerin, 6-10 parts self-emulsifier, 6-8 parts Dead Sea salt, 4-7 parts bamboo charcoal powder, and 0.1-0.3 parts nano silver ions. Component B is a hydrophilic polyurethane. The surfactant is amamidopropyl hydroxysulfonyl benzoate with a purity ≥98%, the hydrophilic polyurethane has a hydroxyl value of 350-450 mg KOH / g, and a moisture content ≤0.1%; the bamboo charcoal powder is nano-bamboo charcoal with a particle size of 200-500 mesh and a specific surface area ≥800 m² / g; the Dead Sea salt is activated by calcination at 300-500℃, with a magnesium content ≥12% and a bromine content ≥0.5%; the nano-silver ions are spherical silver nanoparticles with a particle size of 10-20 nm, and the surface is modified with polyvinylpyrrolidone; the hydrophilic polyurethane has a hydroxyl value of 350-450 mg KOH / g and a moisture content ≤0.1%, and the hydrophilic polyurethane generally... It is prepared by prepolymerization reaction of polyether polyol and isocyanate, wherein the molecular weight of polyether polyol is 2000-3000; the self-emulsifier is sodium cocoyl ethyl sulfonate, with an active ingredient content ≥90%; the aloe vera essence is prepared by vacuum concentration of aloe vera leaf extract, with a solid content ≥10%; the purity of glycerin is ≥99.5% and its moisture content is ≤0.2%; in component A, the weight ratio of bamboo charcoal powder to Dead Sea salt is 4-7:6-8, the weight ratio of nano silver ions to surfactant is 0.1-0.3:10-15, and the amount of pore opener added is 1-3% of the total weight of component A to control the pore density and pore size distribution.

[0022] The preparation of a hydrophilic PU bamboo charcoal Dead Sea salt self-cleaning bath sponge includes the following steps: S1. Preparation of A material: Mix water, pore opener, surfactant, aloe vera extract, glycerin and self-emulsifier, emulsify at 100-200 r / min for 15-20 min, add Dead Sea salt, bamboo charcoal powder and nano silver ions, continue emulsification for 5-10 min, and control the temperature at room temperature; S2. Raw material preheating: Material A is kept at 12-18℃, and material B is preheated to 28-33℃; S3. Mixing and foaming: Materials A and B are fed to the machine head by a metering pump in a mass ratio of 1.2-1.5:1. They are stirred at high speed of 4000-6000r / min for 1-3s, with a mixing pressure of 0.4-0.8MPa. The mixture is then injected into a mold at 28-35℃ for foaming and shaping for 15-20min. S4. Drying and shaping: The shaped blank is dried at 40-50℃ and relative humidity ≤20% for 8-12 hours to obtain the finished product.

[0023] Step S3 also includes injecting the mixed material into a mold for foaming and shaping. The temperature of the mold is controlled at 28-35℃, the foaming and shaping time is 15-20 minutes, and a honeycomb-shaped flow guiding structure is provided in the mold to guide the growth direction of the foam cells. Step S3 is followed by a low-temperature drying step: the foamed and shaped green body is placed in a drying oven and dried at a temperature of 40-50℃ for 8-12 hours. During the drying process, the relative humidity of the environment is controlled to be ≤20%, and heat is transferred by hot air circulation in the drying oven. In step S3, the head device of the PU foaming machine includes a mixing chamber and a static mixer. The inner wall of the mixing chamber is provided with a spiral guide groove, and the static mixer has 8-12 units to enhance the radial mixing effect of the materials.

[0024] Example 1 It is made of two components, A and B, through high-speed mixing and foaming. Component A, by weight, includes 65 parts water, 2 parts cell opener, 12 parts surfactant, 0.3 parts aloe vera extract, 6 parts glycerin, 8 parts self-emulsifier, 7 parts Dead Sea salt (calcined at 400℃), 5 parts bamboo charcoal powder (300 mesh), and 0.2 parts nano silver ions (15nm). Component B is a hydrophilic polyurethane with a hydroxyl value of 400mgKOH / g. The emulsification speed of component A is 150r / min at 15℃, and the temperature of component B is 30℃. The mass ratio of components A to B is 1.3:1, the stirring speed is 5000r / min, the mold temperature is 50℃, the drying temperature is 28℃, and the humidity is 18%.

[0025] In this embodiment, the product has a density of 0.25 g / cm³, a water absorption rate of 320%, a pore size of 100-150 μm, a natural degradation rate of 92% after 6 months, an E. coli inhibition rate of 99.5%, and an 18% increase in skin moisture content. After 50 uses, it exhibits no odor or structural damage. Through a median formula and optimized process, it achieves a synergistic effect of environmental degradation, highly effective antibacterial properties, and skin-friendly moisturizing. The honeycomb pore structure ensures a balance between self-cleaning function and durability, making it suitable for the mainstream consumer market.

[0026] Example 2 It is made of two components, A and B, through high-speed mixing and foaming. Component A, by weight, includes 55 parts water, 1 part cell opener, 10 parts surfactant, 0.2 parts aloe vera extract, 5 parts glycerin, 6 parts self-emulsifier, 6 parts Dead Sea salt calcined at 300℃, 4 parts bamboo charcoal powder (200 mesh), and 0.1 parts nano silver ions (10nm). Component B is a hydrophilic polyurethane with a hydroxyl value of 350mgKOH / g. The emulsification speed of component A is 100r / min at 12℃, and the temperature of component B is 28℃. The mass ratio of components A to B is 1.2:1, the stirring speed is 4000r / min, the mold temperature is 28℃, the drying temperature is 40℃, and the humidity is 10%.

[0027] In this embodiment, the product has a density of 0.22 g / cm³, a water absorption rate of 300%, a pore size of 50-100 μm, a natural degradation rate of 90% after 6 months, an E. coli inhibition rate of 99%, and a skin moisture content increase of 15%. The structure remains intact after 40 uses. By using low-dose functional ingredients and low-temperature processing, the production cost is reduced while ensuring basic performance, making it suitable for economical products. The refined pore size improves the product's softness while still meeting environmental protection and antibacterial requirements.

[0028] Example 3 It is made by high-speed mixing and foaming of two components, A and B. Component A, by weight, includes 75 parts water, 3 parts cell opener, 15 parts surfactant, 0.5 parts aloe vera extract, 8 parts glycerin, 10 parts self-emulsifier, 8 parts Dead Sea salt calcined at 500℃, 7 parts bamboo charcoal powder (500 mesh), and 0.3 parts nano silver ions (20nm). Component B is hydrophilic polyurethane with a hydroxyl value of 450mgKOH / g. The emulsification speed of component A is 200r / min at 18℃, and the temperature of component B is 33℃. The mass ratio of components A to B is 1.5:1, the stirring speed is 6000r / min, the mold temperature is 35℃, the drying temperature is 50℃, and the humidity is 20%.

[0029] In this embodiment, the product has a density of 0.28 g / cm³, a water absorption rate of 350%, a pore size of 150-200 μm, a 95% natural degradation rate after 6 months, a 99.8% E. coli inhibition rate, a 20% increase in skin moisture content, and no structural damage after 60 uses. Its adsorption and cleaning ability is 12% higher than that of Example 1. By using a high dose of bamboo charcoal powder and Dead Sea salt, and stirring at high speed, the adsorption, cleaning, and mineral skin care functions are enhanced, making it suitable for the high-end market. The large-pore size enhances the efficiency of water and foam conduction, and the high-density pore structure further improves durability.

[0030] As can be seen from Examples 1, 2, and 3, this invention, through a two-component polyurethane foaming process, organically combines the adsorption properties of bamboo charcoal powder, the mineral activity of Dead Sea salt, the antibacterial properties of nano-silver, and the environmentally friendly degradability of hydrophilic PU, thus solving the shortcomings of traditional bath sponges, such as poor environmental performance and limited functionality. The three examples respectively verified the feasibility of the mid-range formula, the economical formula, and the high-end formula, all achieving the goals of environmental degradability, antibacterial self-cleaning, and skin-friendly moisturizing, thus upgrading the functionality of the bath sponge.

[0031] 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.

Claims

1. A hydrophilic PU bamboo charcoal Dead Sea salt self-cleaning bath sponge, characterized in that, It is made by high-speed mixing and foaming of two components, A and B; component A is an aqueous emulsifying material, which includes, by weight: 55-75 parts water, 1-3 parts cell opener, 10-15 parts surfactant, 0.2-0.5 parts aloe vera extract, 5-8 parts glycerin, 6-10 parts self-emulsifier, 6-8 parts Dead Sea salt, 4-7 parts bamboo charcoal powder, and 0.1-0.3 parts nano silver ions; component B is hydrophilic polyurethane.

2. The hydrophilic PU bamboo charcoal Dead Sea salt self-cleaning bath sponge according to claim 1, characterized in that, The surfactant is amamidopropyl hydroxysulfonyl benzoyl alkaloid with a purity of ≥98%, and the hydrophilic polyurethane has a hydroxyl value of 350-450 mg KOH / g and a moisture content of ≤0.1%.

3. The hydrophilic PU bamboo charcoal Dead Sea salt self-cleaning bath sponge according to claim 1, characterized in that, The bamboo charcoal powder is nano bamboo charcoal with a particle size of 200-500 mesh and a specific surface area of ​​≥800m² / g; the Dead Sea salt is activated by calcination at 300-500℃ and has a magnesium content of ≥12% and a bromine content of ≥0.5%; the nano silver ions are spherical silver nanoparticles with a particle size of 10-20nm and their surface is modified with polyvinylpyrrolidone.

4. The hydrophilic PU bamboo charcoal Dead Sea salt self-cleaning bath sponge according to claim 1, characterized in that, The hydrophilic polyurethane is prepared by a prepolymerization reaction of polyether polyol and isocyanate, wherein the molecular weight of the polyether polyol is 2000-3000.

5. The hydrophilic PU bamboo charcoal Dead Sea salt self-cleaning bath sponge according to claim 1, characterized in that, The self-emulsifier is sodium cocoyl ethyl sulfonate, with an active ingredient content of ≥90%; the aloe vera extract is prepared by vacuum concentration of aloe vera leaf extract, with a solid content of ≥10%; the glycerin has a purity of ≥99.5% and a moisture content of ≤0.2%.

6. The preparation of a hydrophilic PU bamboo charcoal Dead Sea salt self-cleaning bath sponge according to claim 4, characterized in that, The weight ratio of bamboo charcoal powder to Dead Sea salt in material A is 4-7:6-8, the weight ratio of nano silver ions to surfactant is 0.1-0.3:10-15, and the amount of pore opener added is 1-3% of the total weight of material A, in order to control the pore density and pore size distribution.

7. The preparation method of a hydrophilic PU bamboo charcoal Dead Sea salt self-cleaning bath sponge according to claims 1-6, characterized in that, Includes the following steps: S1. Preparation of A material: Mix water, pore opener, surfactant, aloe vera extract, glycerin and self-emulsifier, emulsify at 100-200 r / min for 15-20 min, add Dead Sea salt, bamboo charcoal powder and nano silver ions, continue emulsification for 5-10 min, and control the temperature at room temperature; S2. Raw material preheating: Material A is kept at 12-18℃, and material B is preheated to 28-33℃; S3. Mixing and foaming: Materials A and B are fed to the machine head by a metering pump in a mass ratio of 1.2-1.5:

1. They are stirred at high speed of 4000-6000r / min for 1-3s, with a mixing pressure of 0.4-0.8MPa. The mixture is then injected into a mold at 28-35℃ for foaming and shaping for 15-20min. S4. Drying and shaping: The shaped blank is dried at 40-50℃ and relative humidity ≤20% for 8-12 hours to obtain the finished product.

8. The method for preparing a hydrophilic PU bamboo charcoal Dead Sea salt self-cleaning bath sponge according to claim 7, characterized in that, Step S3 further includes injecting the mixed material into a mold for foaming and shaping. The temperature of the mold is controlled at 28-35℃, the foaming and shaping time is 15-20 minutes, and a honeycomb-shaped flow guiding structure is provided in the mold to guide the growth direction of the foam cells.

9. The method for preparing a hydrophilic PU bamboo charcoal Dead Sea salt self-cleaning bath sponge according to claim 7, characterized in that, Step S3 is followed by a low-temperature drying step: the foamed and shaped blank is placed in a drying oven and dried at a temperature of 40-50℃ for 8-12 hours. During the drying process, the relative humidity of the environment is controlled to be ≤20%, and heat is transferred by hot air circulation in the drying oven.

10. The method for preparing a hydrophilic PU bamboo charcoal Dead Sea salt self-cleaning bath sponge according to claim 7, characterized in that, In step S3, the head device of the PU foaming machine includes a mixing chamber and a static mixer. The inner wall of the mixing chamber is provided with a spiral guide groove, and the static mixer has 8-12 units to enhance the radial mixing effect of the materials.

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