Manufacturing method for enhancing sinking resistance of non-woven cloth through ultraviolet light curing method and application

Abstract

The invention relates to the technical field of bulletproof product manufacturing, and discloses a manufacturing method and application of an anti-sinking non-woven fabric, and the method comprises the steps of unwinding high-strength fibers, separating, bundling, spreading, gluing, rolling, cutting and bonding, orthogonal compounding, hot pressing, ultraviolet curing and the like. And the adhesive is an olefin adhesive added with a photoinitiator, so that the problems of delamination and large depression can be avoided when the bulletproof product is prepared.

Description

Technical Field

[0001] The invention relates to the technical field of bullet-proof product manufacturing, and in particular to a manufacturing method and application of a non-woven fabric with enhanced anti-dent performance. Background Art

[0002] Bulletproof fiber composite materials are resin-based composite materials with fiber as reinforcement material. They have excellent physical and mechanical properties and good kinetic energy absorption, and thus have good anti-ballistic performance. Unwoven fabric (UD) composite materials belong to the range of fiber composite materials. There are many types of high-strength fibers suitable for making unidirectional prepreg tapes. For example, ultra-high molecular weight polyethylene (UHMWPE) fibers are suitable for making unidirectional prepreg tapes. This avoids the weakest point formed by the reflection and superposition of stress waves at the intersection of fibers in the woven fabric. The unidirectionally arranged prepreg tapes are more conducive to the energy absorption and energy dissipation of the fibers, and thus have better anti-ballistic performance than other fabric structures.

[0003] Bulletproof materials can be divided into soft bulletproof materials and hard bulletproof materials according to the elastic modulus of the resin matrix.

[0004] However, after being hit by bullets, hard bulletproof materials are made into bulletproof products. Since the adhesives used are mostly thermoplastic polymer compounds with low strength, they usually partially delaminate and have large depressions during target shooting, affecting the bulletproof performance. Summary of the invention

[0005] In view of this, the present invention provides a method for manufacturing a non-woven fabric with enhanced anti-dent performance and its application. The manufacturing method of the present invention can obtain a non-woven fabric with excellent performance. After the non-woven fabric is made into a bulletproof product, the problems of delamination and large indentation can be avoided.

[0006] The present invention introduces ultraviolet light crosslinking and curing technology into the UD cloth manufacturing method, and performs ultraviolet light crosslinking and curing on the olefin adhesive in the last step of the molding process. This is mainly because the crosslinking and curing occurs in the middle of other processes, which will affect the fluidity and adhesion of the adhesive. Especially in the hot pressing stage, the adhesive after crosslinking and curing is difficult to melt well, which affects the adhesion between the product layers. Therefore, the ultraviolet light crosslinking and curing needs to be placed in the last step.

[0007] UV curing can improve the interfacial bonding performance between the fiber and the adhesive, enhance the strength of the adhesive, and thus enhance the anti-dent and anti-delamination performance of the bullet-proof product. The dose rate of the UV light used in the present invention is 5 to 70 KGy / S on average, and the UV reaction atmosphere is selected from one of N2, Ar or C2H2 gas.

[0008] In an embodiment of the present invention, the high-strength fiber is selected from aramid fiber, UHMWPE fiber or PBO fiber, that is, the high-strength fiber is any one of aramid fiber, UHMWPE fiber and PBO fiber (poly(p-phenylene benzobisoxazole) fiber).

[0009] The tensile strength of the high-strength fiber of the present invention is above 22 cN / dtex, and the tensile modulus is above 700 cN / dtex. The tensile modulus is also called Young's modulus, and its physical meaning is: the ratio of stress to strain generated by an object under tension within a linear range (elastic range); the tensile strength is the ability of an object to resist deformation within the elastic range after being subjected to tension, and the tensile strength = deformation per unit length × tensile modulus.

[0010] In the embodiment of the present invention, the spread unidirectionally arranged high-strength fibers are passed through a glue dipping tank and glued with an olefin adhesive to which a photoinitiator is added, thereby obtaining a high-strength fiber layer.

[0011] In an embodiment of the present invention, the adhesive used in gluing is an olefin adhesive to which a photoinitiator is added.

[0012] In an embodiment of the present invention, the weight percentage of the adhesive in the non-woven fabric is less than 30%.

[0013] The composite can be prepared by conventional processes in the art. The surface density of the unidirectional prepreg tape can be 20 to 100 g / m 2 .

[0014] In some embodiments of the present invention, the uni-oriented prepreg tapes may be composited in a 0° / 90° orthogonal manner to obtain a orthogonal composite sheet.

[0015] In addition, the bulletproof product provided by the present invention is obtained by stacking a plurality of orthogonal composite sheets orthogonally and then subjecting them to molding.

[0016] In an embodiment of the present invention, after a plurality of orthogonal composite sheets are orthogonally stacked, during the molding process of making a bullet-proof product, the pressure is at least 10 MPa, the temperature is at least 100° C., and the holding time is at least 30 minutes.

[0017] After hot pressing, the bulletproof product is exposed to ultraviolet light to enhance the bond strength between the adhesive and the fiber.

[0018] The bullet-proof product provided by the present invention is tested for M80 bullet according to NIJ0101.04 standard, and the depression after the bullet impact is significantly reduced, and no delamination occurs, and the bullet-proof performance is excellent. DETAILED DESCRIPTION

[0019] 1) Unwind a certain number of tubes of fiber from the creel; 2) The unwound fiber bundle is separated through the transition creel; 3) Bunching the fiber bundles passing through the transition creel through the reed; 4) The fiber bundles passing through the reed are warped by a warping machine, then passed through a front traction device, and then spread by a wire spreading mechanism; 5) The spread fiber bundle passes through an olefin adhesive with a photoinitiator added to the dipping tank; 6) The glued fibers are shaped by a heat setting mechanism; 7) Dry thoroughly in drying equipment; 8) Rolling; 9) making the longitudinal slices into transverse slices; 10) Orthogonally compounding the longitudinal slices and the transverse slices; 11) The orthogonal composite sheets are stacked on a press and hot pressed. During the hot pressing process, the pressure is at least 10 MPa, the temperature is at least 100°C, and the holding time is at least 30 minutes; 12) The hot-pressed bullet-proof products are cross-linked and cured in an ultraviolet irradiation device to enhance the bonding strength between the fibers and adhesive of the bullet-proof products and enhance the anti-dent performance of the bullet-proof products.

[0020] In order to further understand the present application, the non-woven fabric provided by the present application and its manufacturing method and application are specifically described below in conjunction with embodiments.

[0021] Example 1 The commercially available ultra-high molecular weight polyethylene fiber 800D / 280F (strength 39 cN / dtex, tensile modulus 2150 cN / dtex) was unwound from the creel, and the unwound fiber bundle was sequentially bundled by a bundling frame, separated by a fiber fork, and spread by a fiber spreading device to obtain unidirectionally arranged fibers.

[0022] Then, the spread fiber bundle is glued in a glue dipping tank, and the glued fiber is dried in a drying tunnel at 78°C, and finally rolled up by a winding device to obtain a unidirectional prepreg tape. The surface density of the unidirectional prepreg tape is 29g / m 2 .

[0023] The prepreg tape obtained above was compounded at 0° / 90° to obtain a two-orthogonal composite sheet. The surface density of the obtained two-orthogonal composite sheet was 58g / m 2 .

[0024] In this embodiment, water-based polyurethane emulsion is used for gluing, and the amount of gluing is 14% (in the present invention, the amount of gluing refers to the ratio of the weight of the applied adhesive to the weight of the resulting non-woven fabric).

[0025] Then 258 layers of orthogonal composite sheets are laid up to a surface density of 15kg / m 2The orthogonal stacking is carried out on a 1500 ton press at a temperature of 120°C for 40 minutes, and the temperature is lowered to 45°C while maintaining the pressure to open the mold to obtain a bullet-proof product.

[0026] The M80 bullet was tested according to NIJ0101.04 standard, and the results showed that the dent was 55mm.

[0027] In Comparative Example 1, the aqueous polyurethane emulsion was replaced by an acrylate emulsion with a photoinitiator added.

[0028] The surface density obtained by 258 layers of the above two orthogonal composite sheets is 15kg / m 2 The orthogonal stacking is carried out on a 1500 ton press at a temperature of 120°C for 40 minutes, and the temperature is lowered to 45°C while maintaining the pressure to open the mold to obtain a bullet-proof product.

[0029] The M80 bullet was tested according to NIJ0101.04 standard, and the results showed that the dent was 39mm.

[0030] Example 2 The commercially available PBO fiber 1000D / 650F (strength 37 cN / dtex, tensile modulus 1150 cN / dtex) was unwound from the creel, and the unwound fiber bundle was sequentially bundled by a bundler, separated by a fiber fork, and spread by a fiber spreading device to obtain unidirectionally arranged fibers.

[0031] Then, the spread fiber bundle is glued in a glue dipping tank, the glued fiber is dried in a drying tunnel at 80°C, and finally rolled up by a winding device to obtain a unidirectional prepreg tape. The surface density of the unidirectional prepreg tape is 57g / m 2 .

[0032] The prepreg tape obtained above was compounded at 0° / 90° to obtain a two-orthogonal composite sheet. The surface density of the two-orthogonal composite sheet was 114g / m 2 .

[0033] In this embodiment 2, water-based polyurethane emulsion is used for gluing, and the gluing amount is 13%.

[0034] The surface density of 15kg / m2 is obtained by 131 layers of orthogonal composite sheets. 2 The orthogonal stacking is molded on a 1500-ton press at 120°C for 10 minutes, and the temperature is lowered to 45°C while maintaining the pressure to open the mold to obtain a bullet-proof product.

[0035] The M80 bullet was tested according to NIJ0101.04 standard, and the results showed that the dent was 48mm.

[0036] In Comparative Example 2, the aqueous polyurethane emulsion was replaced by an acrylate emulsion with a photoinitiator added.

[0037] The surface density obtained by 131 layers of the above two orthogonal composite sheets is 15kg / m 2 The orthogonal stacking is carried out on a 1500 ton press at a temperature of 120°C for 40 minutes, and the temperature is lowered to 45°C while maintaining the pressure to open the mold to obtain a bullet-proof product.

[0038] The M80 bullet was tested according to NIJ0101.04 standard, and the results showed that the dent was 31mm.

[0039] The results of the embodiments and comparative examples of the above-mentioned bullet-proof products are as follows: name <![CDATA[Single-sided areal density (g / m 2 )]]> Glue amount (%) fiber Adhesives <![CDATA[Target areal density (kg / m 2） > Test Type Depression value (mm) Example 1 29 14 Ultra high molecular weight polyethylene fiber Waterborne polyurethane emulsion 15 M80 55 Comparative Example 1 29 14 Ultra high molecular weight polyethylene fiber Acrylate emulsion with photoinitiator 15 M80 39 Example 2 57 13 PBO fiber Waterborne polyurethane emulsion 15 M80 48 Comparative Example 2 57 13 PBO fiber Acrylate emulsion with photoinitiator 15 M80 31 From the above data, it can be seen that the anti-dent performance of bullet-proof products cured by UV light has been significantly improved.

Claims

1. A method and application of enhancing the anti-sag performance of non-woven fabric by ultraviolet curing, characterized in that: A non-woven fabric, which is made of multiple unidirectional parallel tensioned high-strength high-modulus fiber monofilaments, which are bonded into sheets by dipping and bonding, and then laminated and molded at 0° / 90°. After the sheet is hot-pressed, it needs to be cross-linked and cured under ultraviolet light to enhance the bonding strength between the adhesive and the fiber, and improve the anti-dent performance of the bullet-proof product.

2. The method and application of manufacturing the non-woven fabric by UV curing to enhance the anti-sag performance of the non-woven fabric according to claim 1, characterized in that: In the last step of the normal weft-free fabric production process, that is, after the hot pressing process, a UV curing process needs to be added.

3. The method for manufacturing and using the UV curing method to enhance the anti-sag performance of the non-woven fabric according to claim 1, characterized in that: The high-strength fiber has a tensile strength of 22 cN / dtex or more.

4. The method for manufacturing and using the UV curing method to enhance the anti-sag performance of the non-woven fabric according to claim 1, characterized in that: The high-strength fiber is selected from aramid fiber, UHMWPE fiber or PBO fiber.

5. The method for manufacturing and using the UV curing method to enhance the anti-sag performance of the non-woven fabric according to claim 1, characterized in that: The adhesive used is a water-based olefin adhesive with a photoinitiator added.

6. The method for manufacturing and using the UV curing method to enhance the anti-sag performance of the non-woven fabric according to claim 1, characterized in that: The weight percentage of the adhesive in the non-woven fabric is less than 30%.

7. The method for manufacturing and using the UV curing method to enhance the anti-sag performance of the non-woven fabric according to claim 1, characterized in that: The average dose rate of the ultraviolet light is 5 to 70 KGy / S, and the ultraviolet light reaction atmosphere is selected from one of N2, Ar or C2H2 gases.