A method for preparing fabric with electromagnetic wave and heat protection functions and clothing thereof

Abstract

The present invention discloses a method for preparing a fabric and clothing having electromagnetic wave and heat protection functions, comprising the following steps: Step 1: placing homemade NiFe hydrotalcite / graphene into a glass container; Step 2: adding polyvinyl alcohol and citric acid to deionized water to prepare solution S2; Step 3: dispersing NiFe hydrotalcite / graphene material S1 after surface plasma treatment into solution S2, filtering, drying, and grinding into powder S3; Step 4: placing S3 into a glass container and performing plasma treatment to prepare PVA-modified NiFe hydrotalcite / graphene material S4; Step 5: blending S4 powder, NaCl, a flame retardant, and a resin in a blender to prepare a mixed resin S5. The present invention belongs to the field of protective fabric clothing and provides a method for preparing a fabric and clothing that has electromagnetic wave shielding properties while also having partial electromagnetic wave absorption and can shrink to form a certain air protection layer when subjected to thermal shock.

Description

Technical Field

[0001] The present invention belongs to the field of protective fabric clothing, and in particular relates to a fabric with electromagnetic wave and heat protection functions and a preparation method of clothing thereof. Background Art

[0002] Personal protective clothing is a "magic weapon" to protect the health of workers. However, some work scenarios are more complex, such as the power sector and the communications sector, which have requirements for electromagnetic wave and thermal protection for workers. This requires us to develop multifunctional protective clothing to meet market demand. However, there are currently few clothing on the market that has both electromagnetic wave and thermal protection functions.

[0003] Existing electromagnetic wave protective clothing (such as patents CN211241799U and CN212171527U) primarily shields electromagnetic waves, but lacks effective electromagnetic wave protective clothing that also absorbs electromagnetic waves. Furthermore, in terms of thermal protection, relying solely on the flame retardant properties of the fabric itself is insufficient to achieve both flame retardancy and comfort and portability.

[0004] To this end, we propose a method for preparing a fabric with electromagnetic wave and heat protection functions and clothing thereof to solve the above problems. Summary of the Invention

[0005] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the present invention is to provide a fabric and a method for preparing clothing that can not only have electromagnetic wave shielding properties but also partial electromagnetic wave absorption and can shrink to form a certain air protection layer when subjected to thermal shock.

[0006] The technical solution of the present invention is a method for preparing a fabric with electromagnetic wave and heat protection functions and clothing thereof, which comprises the following steps:

[0007] Step 1: Place the homemade NiFe hydrotalcite / graphene in a glass container, suspend it, and introduce gas (one or more of argon, nitrogen, and oxygen, where the oxygen ratio is ≤22%) for plasma treatment to prepare a surface-etched and active group-rich NiFe hydrotalcite / graphene material S1;

[0008] Step 2: Add polyvinyl alcohol (PVA) and citric acid to deionized water to prepare solution S2;

[0009] Step 3: Disperse the surface plasma treated NiFe hydrotalcite / graphene material S1 into the S2 solution, adjust the pH value to 10 with NaOH solution, ultrasonically react in a 60°C water bath for 5 hours, and finally filter, dry and grind into powder S3;

[0010] Step 4: S3 is placed in a glass container, suspended and introduced with pure argon gas for plasma treatment to prepare PVA-modified NiFe hydrotalcite / graphene material S4. The plasma grafting process can effectively improve the grafting efficiency and reduce environmental pollution.

[0011] Step 5: Blend the S4 powder, NaCl, flame retardant, and resin in a blender (the resins PVA and TPU) to prepare a mixed resin S5;

[0012] Step 6: The prepared S5 is spot-coated on the fabric by screen printing (the fabric is homemade and is made of a blend of conductive fiber and one or more fibers such as flame-retardant acrylic fiber, flame-retardant viscose, and aramid fiber). The spot-coated shape is a parallelepiped with a lower base and an arc-shaped surface. The fabric layer S6 with electromagnetic wave protection function is then dried, washed, and dried to prepare the fabric layer S6. Compared with the film-forming process, the spot coating can effectively improve the flexibility of the fabric, and the arc shape of the coating surface can improve the electromagnetic wave absorption performance compared with the flat surface.

[0013] Step 7: Fix the polypropylene monofilament (polypropylene monofilament is preferred, as polypropylene fiber has large thermal shrinkage) on S6 by threading the fabric up and down. The spacing between the suture points is 0.5-1 cm, and the spacing between the monofilaments is 0.5-1 cm.

[0014] Step 8: The stitching point A passes through the middle position of the parallelepiped coating described in step 6. This method can improve the fixing strength and ensure the independence of the thermal contraction of the single yarns between the stitching points during the heating process, so that the unit fabric expands more evenly;

[0015] Step 9: Select a homemade fabric with good thermal protection properties as the outer layer S7. The fabric is made of one or more fibers such as aramid, polyimide, and polybenzimidazole. Use the inner and outer layers of fabric to sew the garment. The inner fabric orientation varies depending on the area. In areas such as the armpits, crotch, elbows, and knees, the monofilaments are sewn parallel to the body. In other areas, the monofilaments are sewn perpendicular to the body. This arrangement reduces the resistance of the fabric to expansion in areas of human movement when heated.

[0016] Furthermore, in the step one, the processing voltage is 5KV and the time is 10s.

[0017] Furthermore, in the step 2, the mass of polyvinyl alcohol (PVA) is 10 g, the mass of citric acid is 1 g, and the mass of deionized water is 100 g; in the step 3, the mass of S1 is 1 g, and the volume of the S2 solution is 100 ml.

[0018] Furthermore, the processing voltage of step 4 is 3KV and the processing time is 10s.

[0019] Furthermore, in the step five, the masses of the S4 powder, NaCl, flame retardant and resin are 10g, 1g, 30g and 100g respectively, the blending temperature in the step five is 150-250°C, and the blending time is 30-180min.

[0020] Furthermore, in step six, the length of the lower bottom side is 0.5-2 mm, and the height is 0.2-1 mm.

[0021] Furthermore, in step seven, the diameter of the monofilament selected is about 0.1-0.2 mm.

[0022] After adopting the above technical solution, the beneficial effects of the present invention are as follows: This patent uses homemade NiFe hydrotalcite / graphene as an electromagnetic wave absorber. By designing and screen-printing unique coating points on the electromagnetic shielding fabric, it can not only achieve electromagnetic wave shielding performance but also absorb some electromagnetic waves. At the same time, by inlaying heat-shrinkable monofilaments and structural design on the fabric, the fabric shrinks to form a certain air protection layer when it is subjected to a certain thermal shock. Compared with the existing patent technology, the preparation method of this patent is simpler and more effective. Combined with the outer layer of flame-retardant protective fabric, individual protective clothing with both electromagnetic wave protection and thermal protection functions is prepared. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a planar schematic diagram of the dot-coating shape in step six of the present invention;

[0024] Figure 2 A longitudinal cross section of a single coating point in step 6 of the present invention;

[0025] Figure 3 A plan view of the interweaving of monofilaments and fabrics in step seven of the present invention;

[0026] Figure 4 Schematic diagram of the suturing of the monofilament and the fabric in step seven of the present invention;

[0027] Figure 5 Schematic diagram of the expansion of the fabric after the monofilament is heated and shrunk in step seven of the present invention;

[0028] Figure 6 This is a plan view of the suture point between the monofilament and the fabric in step eight of the present invention;

[0029] Figure 7 This is a cross-sectional view of the suture point between the monofilament and the fabric in step eight of the present invention;

[0030] Figure 8 This is a schematic diagram of the human body of the individual protective clothing in step nine of the present invention. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention are clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0033] Step 1: The self-made NiFe hydrotalcite / graphene was placed in a glass container, suspended and introduced with gas (one or more of argon, nitrogen and oxygen, wherein the oxygen ratio is ≤22%) for plasma treatment at a voltage of 5 kV for 10 seconds to prepare a surface-etched NiFe hydrotalcite / graphene material S1 rich in active groups;

[0034] Step 2: Add 10 g of polyvinyl alcohol (PVA) and 1 g of citric acid to 100 g of deionized water to prepare solution S2;

[0035] Step 3: Disperse 1 g of surface plasma-treated NiFe hydrotalcite / graphene material S1 into 100 ml of S2 solution, adjust the pH to 10 with NaOH solution, and ultrasonically react in a 60°C water bath for 5 hours. Finally, filter, dry, and grind into powder S3.

[0036] Step 4: S3 is placed in a glass container, suspended and introduced into pure argon gas for plasma treatment at a voltage of 3 kV (lower than step 1) for 10 seconds to prepare PVA-modified NiFe hydrotalcite / graphene material S4. The plasma grafting process can effectively improve the grafting efficiency and reduce environmental pollution.

[0037] Step 5: Blend 10g of S4 powder, 1g of NaCl, 30g of flame retardant, and 100g of resin in a blender (the resin PVA, TPU). Set the blending temperature to 150-250°C and the blending time to 30-180min according to different resins to prepare mixed resin S5.

[0038] Step 6: The prepared S5 is spot-coated on the fabric by screen printing (the fabric is homemade and is made of a blend of conductive fiber and one or more fibers such as flame-retardant acrylic fiber, flame-retardant viscose, and aramid fiber). The spot-coated shape is a parallelepiped with a lower base and an arc-shaped surface. The side length of the lower base is 0.5-2 mm and the height is 0.2-1 mm. The fabric layer S6 with electromagnetic wave protection function is then dried, washed, and dried to prepare the fabric layer S6. Compared with the film-forming process, the spot coating can effectively improve the flexibility of the fabric, and the arc shape of the coating surface can improve the electromagnetic wave absorption performance compared with the flat surface.

[0039] Step 7: Fix the polypropylene monofilament (polypropylene monofilament is preferred, as polypropylene fiber has large thermal shrinkage, and the diameter of the monofilament should be about 0.1-0.2mm) on S6 by threading the fabric up and down. The spacing between the suture points should be 0.5-1cm, and the spacing between the monofilaments should be 0.5-1cm.

[0040] Step 8: The stitching point A passes through the middle position of the parallelepiped coating described in step 6. This method can improve the fixing strength and ensure the independence of the thermal contraction of the single yarns between the stitching points during the heating process, so that the unit fabric expands more evenly;

[0041] Step 9: Select a self-made fabric with good thermal protection performance as the outer layer S7, the fabric is made of one or more fibers such as aramid, polyimide, polybenzimidazole, etc., use the inner and outer fabrics to sew clothing, and the direction of the inner fabric is different in different parts, such as the armpits, crotch, elbows, knees, etc. (such as Figure 8 (In the circled area, the inner fabric is sewn with the monofilaments oriented parallel to the body. In other areas, the monofilaments are oriented perpendicular to the body. This arrangement reduces the resistance to fabric expansion in areas of active body movement when heated.)

[0042] The prepared clothing achieves electromagnetic wave shielding of over 40 dB in the range of 100 MHz to 3000 MHz. By adjusting the NiFe hydrotalcite / graphene content and the coating thickness, the fabric's electromagnetic wave absorption in the range of 2 to 18 GHz is reduced to below -10 dB. Testing using a flat-plate thermal insulation instrument shows that the thermal resistance of the fabric of the present invention is 0.3651 CLO at room temperature. When the temperature reaches 100°C, the inner monofilaments of the fabric of the present invention shrink upon exposure to heat, causing the inner fabric to shrink and expand. At this point, the thermal resistance of the fabric reaches 0.7425 CLO, and the thermal insulation performance is 2.03 times that of room temperature.

[0043] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents. In short, if those skilled in the art are inspired by the present invention and, without departing from the purpose of the present invention, design structures and embodiments similar to the technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A method for preparing a fabric with electromagnetic wave and heat protection functions and clothing thereof, characterized in that: The following steps are involved: Step 1: Place the homemade NiFe hydrotalcite / graphene in a glass container, suspend it, and introduce gas for plasma treatment to prepare a NiFe hydrotalcite / graphene material S1 with surface etching and rich active groups; Step 2: Add polyvinyl alcohol (PVA) and citric acid to deionized water to prepare solution S2; Step 3: Disperse the surface plasma treated NiFe hydrotalcite / graphene material S1 into the S2 solution, adjust the pH value to 10 with NaOH solution, ultrasonically react in a 60°C water bath for 5 hours, and finally filter, dry and grind into powder S3; Step 4: S3 is placed in a glass container, suspended and introduced with pure argon gas for plasma treatment to prepare PVA-modified NiFe hydrotalcite / graphene material S4. The plasma grafting process can effectively improve the grafting efficiency and reduce environmental pollution. Step 5: Blend S4 powder, NaCl, flame retardant, and resin in a blender to prepare mixed resin S5; Step 6: The prepared S5 is dotted onto the fabric by screen printing. The dotted shape is a parallelepiped with a lower base and an arc-shaped surface. The fabric is then dried, washed, and dried to prepare a fabric layer S6 with electromagnetic wave protection function. Compared with the film-forming process, the dot coating can effectively improve the flexibility of the fabric. Compared with the flat surface, the arc shape of the coating surface can improve the electromagnetic wave absorption performance. Step 7: Fix the polypropylene monofilament to S6 by threading the fabric up and down, with the spacing between the suture points being 0.5-1 cm and the spacing between the monofilaments being 0.5-1 cm; Step 8: The stitching point A passes through the middle position of the parallelepiped coating described in step 6. This method can improve the fixing strength and ensure the independence of the thermal contraction of the single yarns between the stitching points during the heating process, so that the unit fabric expands more evenly; Step 9: Select a homemade fabric with good thermal protection performance as the outer layer S7. The fabric is made of one or more fibers such as aramid, polyimide, polybenzimidazole, etc. The inner and outer fabrics are used to sew clothing. The direction of the inner fabric is different in different parts. The inner fabric is sewn in the armpits, crotch, elbows, knees and other positions with the direction of the monofilament parallel to the human body. In other parts, the monofilament is perpendicular to the human body. This arrangement can reduce the hindrance of the fabric expanding in the active parts of the human body when heated.

2. The method for preparing a fabric with electromagnetic wave and heat protection functions and clothing thereof according to claim 1, characterized in that: In the first step, the processing voltage is 5KV and the processing time is 10s.

3. The method for preparing a fabric with electromagnetic wave and heat protection functions and clothing thereof according to claim 2, characterized in that: The mass of polyvinyl alcohol (PVA) in step 2 is 10 g, the mass of citric acid is 1 g, and the mass of deionized water is 100 g. The mass of S1 in step 3 is 1 g, and the volume of S2 solution is 100 ml.

4. The method for preparing a fabric with electromagnetic wave and heat protection functions and clothing thereof according to claim 3, characterized in that: The processing voltage of step 4 is 3KV and the processing time is 10s.

5. The method for preparing a fabric with electromagnetic wave and heat protection functions and clothing thereof according to claim 4, characterized in that: The masses of the S4 powder, NaCl, flame retardant and resin in step five are 10 g, 1 g, 30 g and 100 g respectively. The blending temperature in step five is 150-250° C., and the blending time is 30-180 min.

6. The method for preparing a fabric with electromagnetic wave and heat protection functions and clothing thereof according to claim 5, characterized in that: In step six, the length of the lower bottom side is 0.5-2 mm, and the height is 0.2-1 mm.

7. The method for preparing a fabric with electromagnetic wave and heat protection functions and clothing thereof according to claim 6, characterized in that: In step seven, the diameter of the monofilament selected is about 0.1-0.2 mm.

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