An ultra-high molecular weight polyethylene waterproof fabric and a preparation method thereof

Abstract

The present application relates to a kind of waterproof fabric of ultra-high molecular weight polyethylene and its preparation method, the present application is handled with galls and catechu extract solution ultra-high molecular weight polyethylene fabric, using polyurethane A, B glue water preparation waterproof coating, the fabric of the present application has the following advantages: 1) high strength, water repellent waterproof, corrosion-resistant impact-resistant and other excellent performance, hydrostatic pressure is greater than 200kPa, expansion breaking strength is greater than 2MPa;2) the material used is easy to get, preparation process is simple, non-toxic;3) light, soft, with good space deformation ability;4) good durability, can withstand repeated folding, can be recycled, washable, and good cycle stability.

Description

Technical Field

[0001] This invention belongs to the field of waterproof fabrics, specifically a waterproof fabric of ultra-high molecular weight polyethylene and its preparation method. Background Technology

[0002] Ultra-high molecular weight polyethylene fabrics possess a variety of excellent properties, such as high strength and modulus, corrosion resistance, impact resistance, and cut resistance. They can be used in fields such as protective equipment and defense industry.

[0003] The stable chemical composition, low surface energy, and low surface tension of ultra-high molecular weight polyethylene (UHMWPE) fabrics limit their widespread application. Current research on UHMWPE fabrics focuses on modification, coating, and functionalization. Taian Lupunite Plastics Co., Ltd. has invented a coating liquid formulation for UHMWPE coated ropes (application number: CN201310446469.3). This formulation increases the breaking strength of the rope after coating. However, its usability is limited, and it does not adequately consider working in corrosive environments, thus restricting its application. A patent from the Eighth Affiliated Hospital of Sun Yat-sen University describes a method for preparing a long-lasting, lubricating, cartilage-like coating on ultra-high molecular weight polyethylene (UHMWPE) using a method described in application number CN202211074179.6. This invention involves pre-embedding a photoinitiator on the surface of UHMWPE through swelling, followed by plasma activation treatment. A gel precursor solution is then prepared from monomers containing C=C double bonds, a crosslinking agent, and a photoinitiator. Finally, the gel precursor solution is coated onto the UHMWPE surface, resulting in a self-lubricating, biomimetic cartilage-like coating on UHMWPE. This biomimetic coating exhibits high bonding strength with the substrate and good mechanical stability. The modified UHMWPE also demonstrates excellent tribological properties and good biocompatibility, making it highly valuable for clinical application. However, the preparation method for this biomimetic coating is relatively complex, and its durability and service life are not clearly defined, making large-scale application and production difficult. Further research is needed on the modification of coatings on ultra-high molecular weight polyethylene. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an ultra-high molecular weight polyethylene waterproof fabric and its preparation method.

[0005] A method for preparing ultra-high molecular weight polyethylene waterproof fabric includes the following steps:

[0006] Step 1: Prepare gallnut extract and catechin extract using gallnut powder and catechin powder respectively;

[0007] Step 2: Mix the gallnut extract and catechu extract in a certain proportion, and add a certain amount of sodium carbonate to obtain a mixed treatment solution.

[0008] Step 3, the ultra-high molecular weight polyethylene fabric is pretreated with anhydrous ethanol, and after ultrasonic treatment for 2 hours, it is washed and dried;

[0009] Step 4, the pretreated fabric is soaked in the mixed treatment liquid of step 3 for more than 5 hours, and then dried to obtain a modified ultra-high molecular weight polyethylene fabric;

[0010] Step 5, mixing the prepared polyurethane A and B glue, and scraping the polyurethane A and B glue on the modified ultra-high molecular weight polyethylene fabric, and placing it in an oven to dry, to obtain an ultra-high molecular weight polyethylene waterproof fabric.

[0011] Further, the step 1 is specifically that the gallnut and the catechu are ground into powder, then put into a beaker and added with distilled water, and extracted under constant temperature for a period of time, and then filtered to obtain gallnut extract and catechu extract.

[0012] Further, the mass ratio of the gallnut and the catechu to the distilled water is (10-30):(200-600).

[0013] Further, the extraction temperature of the gallnut and the catechu is 80-100℃, and the extraction time is 50-70min.

[0014] Further, in the step 2, the mass ratio of the gallnut to the catechu is (1-3):1, and the mass of sodium carbonate to the volume of the mixed liquid is (1-3):100.

[0015] Further, the volume of the mixed treatment liquid in step 2 to the grammage of the ultra-high molecular weight polyethylene fabric is 200:1.

[0016] Further, the ultra-high molecular weight polyethylene fabric is a plain fabric, and the warp and weft density is 180-250 per 10cm, and the warp and weft are filaments with a linear density of 200D-400D.

[0017] Further, the mass ratio of the A glue to the B glue in the polyurethane A and B glue is 10:(7-11).

[0018] Further, the thickness of the polyurethane A and B glue coating is 0.1-0.3mm, and the drying temperature after scraping on the modified ultra-high molecular weight polyethylene fabric is 60℃-100℃.

[0019] An ultra-high molecular weight polyethylene waterproof fabric is prepared by the above method.

[0020] The application has the advantages that: the material used in the waterproof fabric of the application is economical and easy to obtain, the preparation method is green and environmentally friendly, and the fabric has the characteristics of high strength, high modulus, high water pressure resistance, etc., the mixture of gallnut, catechin and sodium carbonate is used as a modified material to increase the roughness of the fabric surface, increase the bonding strength of the fabric and polyurethane, and obtain a durable high-strength waterproof fabric. The fabric has the following advantages: 1) high strength, water-repellent, corrosion-resistant, impact-resistant and other excellent properties, static water pressure greater than 200kPa, and burst strength greater than 2MPa; 2) the material used is economical and easy to obtain, and the preparation process is simple and non-toxic; 3) light and thin, soft, and good spatial deformation ability; 4) good durability, can withstand repeated folding, can be used repeatedly, washable, and good cycle stability. DETAILED DESCRIPTION

[0021] The technical solutions of the application will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0022] Embodiment 1

[0023] 1) The gallnut and catechin were ground into powder respectively, 20g of each was put into a beaker and 400ml of distilled water was added, and extracted at 100℃ for 60min, and then filtered to obtain gallnut extract and catechin extract.

[0024] 2) 0.5g of the ultra-high molecular weight polyethylene fabric was pretreated with 250ml of anhydrous ethanol, ultrasonicated for 2 hours, and then washed with ultrapure water for 5 times, and then dried in a 60℃ oven.

[0025] 3) 50ml of the gallnut extract and 50ml of the catechin extract were mixed together, 3g of sodium carbonate was added to form a mixed solution, the pretreated fabric was soaked in the mixed solution, and then taken out after standing at room temperature for 6 hours and dried in a 60℃ oven, to obtain a modified ultra-high molecular weight polyethylene fabric.

[0026] 4) A and B adhesives were weighed with a mass ratio of 10:9, A and B adhesives were mixed and magnetically stirred for 15min to obtain polyurethane A and B adhesive.

[0027] 5) The A and B adhesives were evenly scraped and coated on the modified ultra-high molecular weight polyethylene fabric, and then dried in an 80℃ oven to obtain an ultra-high molecular weight polyethylene waterproof fabric.

[0028] The waterproof fabric prepared by the method of Example 1 has a hydrostatic pressure greater than 200 kPa, a bending stiffness of 9.2 cN-cm, a soft hand feeling, an average air permeability as low as 0.120 mm / s, excellent waterproof effect, and a bursting strength of more than 2 MPa, and the comprehensive performance of the fabric does not change much after 100 times of folding.

[0029] Table 1 Change in test results of waterproof fabric before and after folding

[0030]

[0031] Comparative Example 1

[0032] 1) 0.5 g of ultra-high molecular weight polyethylene fabric was pretreated with 250 ml of anhydrous ethanol, ultrasonicated for 2 hours, and then repeatedly washed with ultrapure water for 5 times and dried in a 60°C oven.

[0033] 2) A and B adhesives were weighed in a mass ratio of 10:9, mixed and magnetically stirred for 15 min to prepare polyurethane A and B adhesive.

[0034] 5) The A and B adhesives were uniformly scraped and coated on the modified ultra-high molecular weight polyethylene fabric, which was then dried in an 80°C oven to prepare the ultra-high molecular weight polyethylene waterproof fabric.

[0035] The waterproof fabric prepared by the method of Comparative Example 1 has a hydrostatic pressure greater than 200 kPa, an air permeability of 0.147 mm / s, a bending stiffness of 17.2 cN-cm, a slightly hard hand feeling, a bursting strength of 1.8 MPa, and a damaged coating after 100 times of folding.

[0036] Example 2

[0037] In Example 2, only the ratio of A and B adhesives was changed to 10:7, and the other conditions were the same as in Example 1.

[0038] The waterproof fabric prepared by the method of Example 2 has a hydrostatic pressure greater than 200 kPa, an air permeability of 0.131 mm / s, a bending stiffness of 16.2 cN-cm, a slightly hard hand feeling, a bursting strength of more than 2 MPa, and an intact coating after 100 times of folding.

[0039] In summary, the mixed solution can significantly improve the coating effect of polyurethane A and B adhesives, and obtain ultra-high molecular weight polyethylene fabric with better waterproof performance and durability, and adjusting the ratio of A and B adhesives can help improve the hand feeling. The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for preparing ultra-high molecular weight polyethylene waterproof fabric, characterized in that, Includes the following steps: Step 1: Prepare gallnut extract and catechin extract using gallnut powder and catechin powder respectively; Step 2: Mix the gallnut extract and catechu extract in a certain proportion, and add a certain amount of sodium carbonate to obtain the mixed treatment solution; Step 3: Pre-treat the ultra-high molecular weight polyethylene fabric with anhydrous ethanol, ultrasonically treat for 2 hours, then wash and dry. Step 4: Immerse the pretreated fabric in the mixed treatment solution of Step 3 for more than 5 hours, and then dry it to obtain the modified ultra-high molecular weight polyethylene fabric. Step 5: Mix polyurethane A and B adhesives, apply polyurethane A and B adhesives onto the modified ultra-high molecular weight polyethylene fabric, and dry in an oven to obtain ultra-high molecular weight polyethylene waterproof fabric.

2. The method for preparing an ultra-high molecular weight polyethylene waterproof fabric according to claim 1, characterized in that, Step 1 specifically involves grinding gallnut and catechu into powder, placing them in a beaker, adding distilled water, extracting under constant temperature for a period of time, and then filtering to obtain gallnut extract and catechu extract.

3. The method for preparing an ultra-high molecular weight polyethylene waterproof fabric according to claim 2, characterized in that, The mass ratio of gallnut and catechu to distilled water is (10-30):(200-600).

4. The method for preparing an ultra-high molecular weight polyethylene waterproof fabric according to claim 2, characterized in that, The extraction temperature for both gallnut and catechu is 80-100℃, and the extraction time is 50-70 minutes.

5. The method for preparing an ultra-high molecular weight polyethylene waterproof fabric according to claim 1, characterized in that, In step 2, the mass ratio of gallnut and catechu is (1-3):1, and the ratio of the mass of sodium carbonate in grams to the volume of the mixed liquid in milliliters is (1-3):

100.

6. The method for preparing an ultra-high molecular weight polyethylene waterproof fabric according to claim 1, characterized in that, The ratio of the volume of the mixed treatment liquid in milliliters to the weight of the ultra-high molecular weight polyethylene fabric in step 2 is 200:

1.

7. The method for preparing an ultra-high molecular weight polyethylene waterproof fabric according to claim 1, characterized in that, The ultra-high molecular weight polyethylene fabric is a plain weave fabric with a warp and weft yarn density of 180-250 yarns / 10cm, and the warp and weft yarns are filaments with a linear density of 200D-400D.

8. The method for preparing an ultra-high molecular weight polyethylene waterproof fabric according to claim 1, characterized in that, The mass ratio of A glue to B glue in the polyurethane A, B glue is 10:(7-11).

9. The method for preparing an ultra-high molecular weight polyethylene waterproof fabric according to claim 1, characterized in that, The thickness of the polyurethane A and B coating is 0.1-0.3 mm, and the drying temperature after coating the modified ultra-high molecular weight polyethylene fabric is 60℃-100℃.

10. A waterproof fabric made of ultra-high molecular weight polyethylene, characterized in that, Prepared by the method described in any one of claims 1-9.

Images