Antibacterial scouring pad and preparation method thereof

Abstract

Chitosan and graphene oxide are loaded on the surface of fiber in a layer-by-layer self-assembly mode, the antibacterial property and hydrophilicity of the fiber are improved, then developed special scouring pad phenolic resin serves as the basis, aramid fiber is cured on the outer layer of an aramid fiber network, and the antibacterial scouring pad is obtained. The problem that traditional phenolic resin is poor in antibacterial property and hydrophilicity is solved, the phenolic resin effectively permeates into the three-dimensional porous network structure, the homogeneity and toughness of the grinding tool are guaranteed, and the grinding performance is improved.

Description

Technical Field

[0001] The invention relates to the technical field of household scouring pads, and in particular to an antibacterial scouring pad and a preparation method thereof. Background Art

[0002] At present, daily washing is the main purpose of civilian scouring pads. With the daily use of scouring pads, various bacteria are easily bred, which not only cannot play a cleaning role, but is also not conducive to hygiene and health. At the same time, water has poor wettability on scouring pads prepared from traditional hydrophobic phenolic resins, and the cleaning effect is average during actual use. Therefore, the development of degreasing and decontamination scouring pads with antibacterial functions to solve the above bottlenecks is the subject of this patent. Summary of the invention

[0003] The technical problem to be solved by the present invention is to solve the deficiencies of the above-mentioned prior art as follows.

[0004] In order to solve the above technical problems, the present invention discloses a method for preparing an antibacterial scouring pad, firstly, the aramid fiber is modified by at least one layer-by-layer self-assembly process; then the modified aramid resin is opened and mixed; then air-laying, needle punching, resin application, and high-temperature curing processes are sequentially performed;

[0005] The process of layer-by-layer self-assembly is as follows:

[0006] Step 1: pretreating the aramid fiber with a NaOH solution to hydrolyze the fiber surface;

[0007] Step 2: adding the surface hydrolyzed aramid fiber into a solution of chitosan soaked in positive charge;

[0008] Step 3: Repeatedly wash with deionized water to rinse off the chitosan that is not bound to the aramid fiber;

[0009] Step 4: Drying the aramid fiber;

[0010] Step 5: Soaking the dried aramid fiber in a negatively charged graphene oxide solution;

[0011] Step 6: Wash repeatedly with deionized water and dry.

[0012] Furthermore, the concentration of the NaOH solution is 0.5 to 5 mol / L, and the aramid fiber is immersed in the NaOH solution at 50 to 80° C. for 20 to 40 minutes.

[0013] Furthermore, the chitosan solution is prepared by dissolving chitosan powder in acetic acid solution with a volume fraction of 1 to 3%.

[0014] Furthermore, the preparation method of the graphene oxide aqueous solution is as follows: dissolving graphene oxide in distilled water to prepare a suspension with a mass concentration of 0.3 to 0.5 g / L, and then preparing the graphene oxide aqueous solution by ultrasonic treatment.

[0015] In addition, the invention also discloses an antibacterial scouring pad, which is prepared by the above method.

[0016] The invention has the following advantages: chitosan and graphene oxide with antibacterial and hydrophilic properties are applied to the surface modification of fibers through layer-by-layer self-assembly and finally prepare a civilian scouring pad, thereby improving the antibacterial and hydrophilic properties of the material. Thus, the service life of the scouring pad product is improved; chitosan is widely distributed in nature, and chitosan is a product of natural polysaccharide chitosan with partial acetyl removal, and has multiple physiological functions such as biodegradability, biocompatibility, non-toxicity, and antibacterial, and has excellent performance, low price, and is a green and environmentally friendly renewable resource. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a process flow chart of the present invention;

[0018] Figure 2 Moisture regain of scouring pads at different self-assembly times and chitosan concentrations. DETAILED DESCRIPTION

[0019] The preparation method of the antibacterial scouring pad of the present invention is as follows Figure 1 As shown:

[0020] Fiber surface pretreatment: First, the aramid fiber is pretreated with NaOH. A 1 mol / L NaOH solution is prepared and the aramid fiber is immersed in the solution at 70°C for 30 minutes to hydrolyze the fiber surface, making it easier for the nonwoven fabric to adsorb polyelectrolytes.

[0021] Preparation of chitosan and graphene oxide aqueous solutions: dissolve chitosan powder of different masses in 2% acetic acid solution, stir and dissolve thoroughly to prepare chitosan solution; dissolve graphene oxide in distilled water to prepare a suspension with a mass concentration of 0.4 g / L, and ultrasonicate for 60 minutes to prepare graphene oxide aqueous solution.

[0022] Self-assembly on the surface of aramid fiber: immerse the aramid fiber in a positively charged chitosan solution for 20 minutes, then wash it repeatedly with deionized water for 3 minutes to rinse off the chitosan that is not combined with the nonwoven fabric, and dry it; immerse the dried aramid fiber in a negatively charged graphene oxide solution for 20 minutes, wash it repeatedly with deionized water for 3 minutes, and then dry it. This completes a self-assembly cycle and forms a chitosan / graphene oxide bilayer on the surface of the aramid fiber.

[0023] After the modified aramid fiber is opened and mixed, it is fed into a high-speed rotating cylinder or licker-in roller to be further combed into single fibers. Under the combined action of the centrifugal force of the cylinder or licker-in roller and the airflow, the fiber falls off the sawtooth and is transported by the airflow. Because the pipeline for airflow transportation adopts a Venturi tube, which is a variable cross-section pipeline, that is, the cross-sectional areas of any two cross-sections in the pipeline are not equal, and the pipeline gradually increases from the inlet to the outlet. Since the fiber has a certain length, in the Venturi tube, its head and tail are on two different cross-sections, so the fiber head and tail speeds are different, and the head end speed is lower than the tail end speed, so the fiber changes direction and forms a disordered arrangement, that is, a homogeneous structure; because the airflow flows out from the small holes on the surface of the net curtain in an approximately vertical direction, when the fiber runs along the streamline of the airflow, although it changes direction due to the diffusion of the airflow, it generally falls on the surface of the net curtain in an approximately vertical direction, so a certain proportion of the fibers are arranged along the fiber thickness direction, that is, a three-dimensional porous network structure.

[0024] After the needle punching is completed, two phenolic resin application processes are carried out, and the target product is formed after high-temperature curing.

[0025] The number of self-assembly has a great influence on the surface structure and functional group types of the modified aramid fiber, thus affecting its various properties after being added to the traditional phenolic resin for curing. By controlling the number of self-assembly, the various properties of the modified aramid fiber can be regulated, thereby controlling the properties of the scouring pad made by adding it to the formula. A systematic study was conducted to select the optimal synthesis conditions.

[0026] The traditional phenolic resin and modified aramid fiber were used to prepare a civilian scouring pad with high antibacterial and hydrophilic properties. The changes in appearance color, antibacterial effect and hydrophilic properties were observed by changing the number of layer-by-layer self-assembly and the concentration of chitosan.

[0027] Chitosan, also known as deacetylated chitosan, soluble chitosan, and polysaminoglucose, is an off-white powder, odorless and tasteless. It is slightly soluble in water and almost insoluble in ethanol. This product is a cationic polyamine with a high charge density at pH < 6.5, so it can be adsorbed on the surface of anions and used in layer-by-layer self-assembly. In addition, the surface of chitosan contains abundant amine and hydroxyl groups, which can be further assembled with the carboxyl groups in graphene oxide through hydrogen bonds.

[0028] The following table shows the antibacterial rate (%) of different assembly times and chitosan concentrations.

[0029]

[0030] Figure 2 The moisture regain of scouring pads at different self-assembly times and chitosan concentrations.

[0031] The main technical indicators achieved by the present invention.

[0032] (1) Chitosan and graphene oxide, which have antibacterial and hydrophilic properties, are applied to the surface modification of fibers through layer-by-layer self-assembly and finally used to prepare civilian scouring pads, thereby improving the antibacterial and hydrophilic properties of the materials. This will increase the service life of scouring pad products; (2) Use pure natural bio-based raw materials. Chitin is widely distributed in nature. The amount of chitin biosynthesis is about 10 billion tons per year. It is a recyclable renewable resource. Chitosan is the product of the natural polysaccharide chitin with some acetyl groups removed. It has multiple physiological functions such as biodegradability, biocompatibility, and non-toxicity. It has excellent performance and low price. It is a green and environmentally friendly renewable resource.

[0034] The main technical indicators achieved by the present invention are:

[0035] (1) Appearance: uniform color, no obvious color difference;

[0036] (2) Smoothness: The surface is smooth, without bumps and even fiber distribution;

[0037] (3) Antibacterial effect: Antibacterial rate ≥ 99%

[0038] (4) Weight: 700-750g / m2;

[0039] (5)Thickness: 7-9mm;

[0040] (6) Hydrophilicity: moisture regain ≥ 2%;

[0041] (7) Wear resistance: loss ≤ 0.2 g / time, loss difference ≤ 15%.

Claims

1. A method for preparing an antibacterial scouring pad, characterized in that: First, the aramid fiber is modified by at least one layer-by-layer self-assembly process; then the modified aramid resin is opened and mixed; and then air-laying, needle punching, resin application, and high-temperature curing processes are sequentially performed; The process of layer-by-layer self-assembly is as follows: Step 1: pretreating the aramid fiber with a NaOH solution to hydrolyze the fiber surface; Step 2: adding the surface hydrolyzed aramid fiber into a solution of chitosan soaked in positive charge; Step 3: Repeatedly wash with deionized water to rinse off the chitosan that is not bound to the aramid fiber; Step 4: Drying the aramid fiber; Step 5: Soaking the dried aramid fiber in a negatively charged graphene oxide solution; Step 6: Wash repeatedly with deionized water and dry.

2. The method for preparing the antibacterial scouring pad according to claim 1, characterized in that: The concentration of the NaOH solution is 0.5-5 mol / L, and the aramid fiber is immersed in the NaOH solution at 50-80° C. for 20-40 minutes.

3. The method for preparing the antibacterial scouring pad according to claim 2, characterized in that: The chitosan solution is prepared by dissolving chitosan powder in acetic acid solution with a volume fraction of 1 to 3%.

4. The method for preparing the antibacterial scouring pad according to claim 1, 2 or 3, characterized in that: The preparation method of the graphene oxide aqueous solution is as follows: dissolving graphene oxide in distilled water to prepare a suspension with a mass concentration of 0.3-0.5 g / L, and then preparing the graphene oxide aqueous solution by ultrasonic treatment.

5. An antibacterial scouring pad, characterized in that: The method according to claim 1 is used for preparation.

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