Manufacturing method for enhancing sinking resistance of non-woven cloth through thermocuring method and application

Abstract

The invention discloses a manufacturing method and application capable of enhancing sinking resistance of non-woven cloth, the method comprises the steps of unwinding, dividing, bundling, spreading, gluing, rolling, cutting and bonding, orthogonal compounding, hot pressing and the like of high-strength fibers, and more than two layers of orthogonal composite sheets (non-woven cloth) are hot-pressed together to obtain a bulletproof product. Wherein the used adhesive is a polyurethane water-based adhesive, an epoxy water-based adhesive, an acrylate water-based adhesive and a corresponding high-temperature curing agent, and the high-temperature curing agent does not react with the adhesive in the stages of unwinding, filament splitting, bundling, filament spreading, gluing, winding, cutting and bonding, orthogonal compounding and the like; in the hot pressing stage, the high-temperature curing agent and the adhesive are subjected to a cross-linking curing reaction, the bonding strength between the adhesive and fibers is enhanced, and the problems of delamination and large depression can be avoided when the non-woven fabric is made into bulletproof products.

Description

Technical Field

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

[0002] UD (Uniform Woven Fabric) composite material is a new type of composite material, belonging to the category of fiber composite materials. Bulletproof fiber composite material is a resin-based composite material with fiber as reinforcement material. It has excellent physical and mechanical properties and good kinetic energy absorption, and thus has good bulletproof performance. It is widely used in military, aerospace, marine development and other industries, and is mainly used to manufacture laminated bulletproof inserts, helmets, bulletproof armor and other hard protective products.

[0003] However, after being hit by bullets, hard bulletproof materials made into bulletproof products will usually experience partial delamination and large dents, affecting their bulletproof performance, as most of the adhesives used are thermoplastic polymer compounds with low strength. Summary of the invention

[0004] In view of this, the present invention provides a method for manufacturing a non-woven fabric that resists dents and an application thereof. The manufacturing method of the present invention can obtain a non-woven fabric with good performance, and the non-woven fabric can avoid the problems of delamination and large dents after being made into bulletproof products.

[0005] The adhesive used in the present invention is a polyurethane water-based adhesive, epoxy water-based adhesive, and acrylate water-based adhesive added with a high-temperature curing agent, and the reaction temperature of the high-temperature curing agent is between 100°C and 140°C. In the stages of unwinding, filament separation, bundling, filament spreading, gluing, winding, cutting and bonding, orthogonal compounding, since the process temperature does not reach the reaction temperature of the high-temperature curing agent in these molding stages, the high-temperature curing agent cannot cross-link with the adhesive. In the hot pressing stage, the temperature is above 100°C, and the high-temperature curing agent will cross-link with the adhesive to enhance the bonding strength between the fiber and the adhesive and improve the impact strength and anti-sag performance of the composite material. If a common curing agent is used, the curing reaction will occur too early, which will affect the fluidity of the adhesive. First, it will cause poor gluing and cannot meet the production process; second, due to the premature cross-linking and curing of the adhesive, the adhesive cannot be well melted again in the hot pressing stage, resulting in poor bonding between the layers of the bullet-proof product, and easy delamination, thereby affecting the overall performance of the product.

[0006] The present invention provides a method for manufacturing an anti-sag non-woven fabric, comprising the following steps:

[0007] The high-strength fibers are sequentially unwound, separated, bundled and spread to make the fibers parallel and evenly spread to obtain high-strength fibers with unidirectional arrangement, and then glued with an adhesive to obtain a high-strength fiber unidirectional sheet after drying.

[0008] The transverse sheets and the longitudinal sheets are orthogonally compounded to obtain a weft-free fabric.

[0007] 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.

[0008] In an embodiment of the present invention, the tensile strength of the high-strength fiber is 20 cN / dtex or more.

[0009] In the embodiment of the present invention, the adhesive used for gluing is polyurethane water-based glue, epoxy water-based glue, acrylate water-based glue and its corresponding high-temperature curing agent, and the reaction temperature of the high-temperature curing agent used is between 100°C and 140°C.

[0010] During the hot pressing stage, the high-temperature curing agent and the adhesive undergo a chemical reaction, which enhances the bonding strength between the adhesive and the fiber. This non-woven fabric can avoid problems such as delamination and large depressions when it is made into bullet-proof products.

[0011] In an embodiment of the present invention, the weight percentage of the adhesive in the non-woven fabric is less than 25%.

[0012] The composite can be prepared by conventional processes in the art; the surface density of the unidirectional prepreg tape can be 20 to 90 g / m 2 .

[0013] In some embodiments of the present invention, the unidirectional prepreg tapes may be composited in a 0° / 90° orthogonal manner to obtain a bi-orthogonal composite sheet (also referred to as "weft-free fabric" in the present invention).

[0014] The invention provides a bulletproof product, which is obtained by orthogonally stacking a plurality of orthogonal composite sheets and then subjecting them to molding.

[0015] 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 15 minutes. .

[0016] In a preferred embodiment of the present invention, a plurality of two orthogonal composite sheets are orthogonally stacked and then molded to produce a bullet-proof product. The present invention can produce soft bullet-proof products as well as hard bullet-proof products.

[0017] 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

[0018] 1) Unwind a certain number of tubes of fiber from the creel;

[0021] 2) The unwound fiber bundle is separated through the transition creel;

[0022] 3) Bunching the fiber bundles passing through the transition creel through the reed;

[0023] 4) The fiber bundle passing through the reed is warped by a warping machine, then passes through a front traction device, and then spreads the fiber through a fiber spreading mechanism;

[0024] 5) The spread fiber bundles are passed through the dipping tank to apply adhesive, and an appropriate amount of high temperature curing agent is added to the water-based adhesive;

[0025] 6) The glued fibers are shaped by a heat setting mechanism;

[0026] 7) Dry thoroughly in drying equipment;

[0027] 8) Rolling;

[0028] 9) making the longitudinal slices into transverse slices;

[0029] 10) Orthogonally compounding the longitudinal slices and the transverse slices;

[0030] 11) The orthogonal composite sheets are stacked on a press and hot pressed. During the hot pressing process, the pressure is at least 10MPa, the temperature is at least 100°C, and the holding time is at least 15 minutes. During the hot pressing process, the curing agent and the adhesive are further cross-linked to enhance the bonding strength between the fiber and the adhesive. After the hot pressing is completed, the finished product can be obtained.

[0019] 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.

[0020] Example 1

[0033] The commercially available ultra-high molecular weight polyethylene fiber 800D / 240F (strength 39 cN / dtex, tensile modulus 2110 cN / dtex) was unwound from the creel, and the unwound fiber bundle was sequentially spread through the filament separation, bundling, and filament spreading equipment to obtain unidirectionally arranged fibers.

[0021] Then, the spread fiber bundles are glued in a glue dipping tank, and the glued fibers are dried by large rollers and a drying tunnel at 75°C, and finally rolled up by a winding device to obtain a unidirectional prepreg tape. The surface density of the unidirectional prepreg tape is 30g / m 2 .

[0022] The prepreg tape obtained above was compounded at 0° / 90°, and the surface density of the obtained orthogonal composite sheet was 60g / m 2 .

[0023] In this embodiment, the glue is applied with an aqueous polyurethane emulsion without a high temperature curing agent, and the glue amount is 15% (in the present invention, the glue amount refers to the ratio of the weight of the applied adhesive to the weight of the resulting non-woven fabric).

[0024] Then 283 layers of orthogonal composite sheets are laid up to form a surface density of 17kg / m 2 The orthogonal stacking is molded on a 1800-ton press at 125°C for 30 minutes, and the temperature is lowered to 45°C to open the mold to obtain a bullet-proof product.

[0025] The M80 bullet was tested according to NIJ0101.04 standard, and the results showed that the dent was 55mm.

[0026] In Comparative Example 1, the aqueous polyurethane emulsion to which the high-temperature curing agent is added is used to replace the aqueous polyurethane adhesive to which the high-temperature curing agent is not added.

[0027] The surface density obtained by 283 layers of the above two orthogonal composite sheets is 17kg / m 2 The orthogonal stacking is molded on a 1800-ton press at 125°C for 30 minutes, and the temperature is lowered to 45°C to open the mold to obtain a bullet-proof product.

[0028] The M80 bullet was tested according to NIJ0101.04 standard, and the results showed that the dent was 38mm.

[0029] Example 2

[0043] The commercially available aramid fiber 1000D / 560F (strength 21.05 cN / dtex, tensile modulus 898 cN / dtex) was unwound from the creel, and the unwound fiber bundle was sequentially spread through the fiber separation, bundling and fiber spreading equipment to obtain unidirectionally arranged fibers.

[0030] 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 55g / m 2 .

[0031] 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 110g / m 2 .

[0032] In this embodiment 2, the glue is applied by using an acrylic emulsion without adding a high temperature curing agent, and the glue amount is 12%.

[0033] The surface density of 17kg / m2 is obtained by 154 layers of orthogonal composite sheets. 2The orthogonal stacking is molded on a 1800-ton press at 125°C for 30 minutes, and the temperature is lowered to 45°C to open the mold to obtain a bullet-proof product.

[0034] The M80 bullet was tested according to NIJ0101.04 standard, and the results showed that the dent was 49mm.

[0035] In Comparative Example 2, the acrylate emulsion without adding a high-temperature curing agent was replaced by the acrylate emulsion with adding a high-temperature curing agent.

[0036] The surface density obtained by 154 layers of the above two orthogonal composite sheets is 17kg / m 2 The orthogonal stacking is molded on a 1800-ton press at 125°C for 30 minutes, and the temperature is lowered to 45°C to open the mold to obtain a bullet-proof product.

[0037] The M80 bullet was tested according to NIJ0101.04 standard, and the results showed that the dent was 38mm.

[0038] Example 3

[0053] The commercially available PBO fiber 1000D / 650F (strength 33 cN / dtex, tensile modulus 1050 cN / dtex) was unwound from the creel, and the unwound fiber bundle was sequentially passed through the fiber separation and bundling equipment and spread out to obtain unidirectionally arranged fibers.

[0039] Then, the spread fiber bundle is glued in a glue dipping tank, the glued fiber is dried in a drying tunnel at 85°C, and finally rolled up by a winding device to obtain a unidirectional prepreg tape. The surface density of the unidirectional prepreg tape is 52g / m 2 .

[0040] 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 104g / m 2 .

[0041] In this embodiment 3, the glue is applied by using a water-based polyurethane emulsion without adding a high-temperature curing agent, and the glue amount is 16%.

[0042] The surface density of 17kg / m2 is obtained by 163 layers of orthogonal composite sheets. 2 The orthogonal stacking is molded on a 1800-ton press at 125°C for 30 minutes, and the temperature is lowered to 40°C to open the mold to obtain a bullet-proof product.

[0043] The M80 bullet was tested according to NIJ0101.04 standard, and the results showed that the dent was 49mm.

[0044] In Comparative Example 3, the aqueous polyurethane emulsion to which the high-temperature curing agent is added is used instead of the aqueous polyurethane emulsion to which the high-temperature curing agent is not added.

[0045] The surface density obtained by 163 layers of the above two orthogonal composite sheets is 17kg / m 2 The orthogonal stacking is molded on a 1800-ton press at 125°C for 30 minutes, and the temperature is lowered to 45°C to open the mold to obtain a bullet-proof product.

[0046] The M80 bullet was tested according to NIJ0101.04 standard, and the results showed that the dent was 38mm.

[0047] The examples 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 Concave value / mm Example 1 30 15 Ultra high molecular weight polyethylene fiber Water-based polyurethane emulsion without high temperature curing agent 17 M80 55 Comparative Example 1 30 15 Ultra high molecular weight polyethylene fiber Waterborne polyurethane emulsion with high temperature curing agent 17 M80 38 Example 2 55 12 Aramid fiber Acrylic emulsion without high temperature curing agent 17 M80 49 Comparative Example 2 55 12 Aramid fiber Acrylic emulsion with high temperature curing agent 17 M80 38 Example 3 52 16 PBO fiber Water-based polyurethane emulsion without high temperature curing agent 17 M80 49 Comparative Example 3 52 16 PBO fiber Waterborne polyurethane emulsion with high temperature curing agent 17 M80 38

[0063] From the above data, it can be seen that the anti-dent performance of bullet-proof products with the addition of high-temperature curing agent has been significantly improved.

Claims

1. A non-woven fabric, which is made of two or more layers of horizontal sheets and longitudinal sheets orthogonally composited, and the unidirectional sheets are made of high-strength fibers arranged in a unidirectional manner and glued with an adhesive, and the corresponding high-temperature curing agent is added to the adhesive. A number of orthogonal composite sheets are orthogonally stacked and hot-pressed to obtain a bulletproof product.

2. The non-woven fabric according to claim 1, characterized in that: The high-strength fiber has a tensile strength of 20 cN / dtex or more.

3. The non-woven fabric according to claim 1, characterized in that: The high-strength fiber is selected from PBO fiber, aramid fiber, UHMWPE fiber and the like.

4. 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 25%.

5. The non-woven fabric according to claim 1, characterized in that: The adhesives used are polyurethane water-based adhesive, epoxy water-based adhesive, acrylate water-based adhesive and their corresponding high-temperature curing agents, and the reaction temperature of the high-temperature curing agents used is between 100°C and 140°C.

6. The ballistic-resistant article according to claim 1, characterized in that The high temperature curing agent used only undergoes a cross-linking curing reaction during the hot pressing process, and does not undergo a chemical reaction in other processes.

7. The ballistic-resistant article according to claim 1, characterized in that During the hot pressing stage, the high-temperature curing agent and the adhesive undergo a chemical reaction, which enhances the bonding strength between the adhesive and the fiber. This non-woven fabric can avoid problems such as delamination and large depressions when it is made into bullet-proof products.