阅读说明：本技术 无机颗粒梯度沉降成形的热塑性防刺割树脂片及其制备方法与应用 (Thermoplastic anti-piercing resin sheet formed by inorganic particle gradient sedimentation and preparation method and application thereof ) 是由 刘洪玲 陈立富 刘晓艳 于伟东 于 2019-09-27 设计创作，主要内容包括：本发明涉及一种无机颗粒梯度沉降成形的热塑性防刺割树脂片及制备方法与用途。该树脂片是由微米尺度的无机颗粒在热塑性树脂液中作均匀沉降堆砌并降温固化后形成梯度分布结构的复合树脂片。其制备方法是在高温下,将无机颗粒铺层于熔融树脂的表面,然后在定压平板的加压下浸入树脂液内,并在重力作用下缓慢沉向底部,因上下层温度差,而显梯度分布,真空除去气泡后降温固化成型为复合树脂片,该树脂片倒置使用,即刀具从低密度进入高密度,形成等加速的受力过程,而使阻挡效率和缓冲作用更优,更好的放大反向切割锐器。使其迅速平钝和毛刺化,达到防刺割功效。可用于防恐防暴、消防、防爆炸、地震搜救及国防军事的个体防护着装材料。(The invention relates to a thermoplastic anti-piercing resin sheet formed by inorganic particle gradient sedimentation and a preparation method and application thereof. The resin sheet is a composite resin sheet which is formed by uniformly settling and stacking micron-sized inorganic particles in thermoplastic resin liquid and cooling and solidifying the resin sheet to form a gradient distribution structure. The preparation method comprises the steps of laying inorganic particles on the surface of molten resin at high temperature, then immersing the molten resin into resin liquid under the pressure of a constant pressure flat plate, slowly sinking to the bottom under the action of gravity, showing gradient distribution due to the temperature difference of the upper layer and the lower layer, cooling and solidifying to form a composite resin sheet after bubbles are removed in vacuum, and using the resin sheet upside down, namely, enabling a cutter to enter high density from low density to form an equally accelerated stress process, so that the blocking efficiency and the buffering effect are better, and the reverse cutting sharp device is better amplified. So that the utility model can be quickly blunted and burred to achieve the effect of preventing cutting. Can be used as an individual protection dressing material for preventing terrorism and riot, fire fighting, explosion prevention, earthquake search and rescue and national defense and military.)

1. The thermoplastic anti-piercing resin sheet formed by inorganic particle gradient sedimentation is characterized in that a composite sheet body is formed by stacking inorganic particles with micron scale in a thermoplastic resin melt, wherein the inorganic particles have a gradient distribution structure or a layered gradient structure, and cooling and solidifying the inorganic particles; the gradient distribution structure or the layered gradient structure is a structure formed by naturally settling inorganic particles in a melt of the thermoplastic resin due to self weight and stably solidifying the inorganic particles; the gradient distribution structure refers to a structure filled by inorganic particles with high-density stacking to low-density stacking, even approximately zero inorganic particles; the layered gradient structure comprises a structure filled with inorganic particles and a pure resin layer, wherein the inorganic particles are densely piled to lowly piled and even approximately zero.

2. The thermoplastic anti-stab-cutting resin sheet formed by inorganic particle gradient-settling of claim 1, wherein the average particle size of the inorganic particles is 1 to 100 μm; the filling mass fraction of the inorganic particles in the anti-cutting resin sheet is 20-45 wt%.

3. The inorganic particle gradient sedimentation shaped thermoplastic anti-stab resin sheet according to claim 1, wherein the inorganic particles are one or a mixture of silicon carbide particles, synthetic diamond particles, boron carbide particles, or boron nitride particles.

4. The thermoplastic anti-stab-cutting resin sheet formed by inorganic particle gradient-settling as claimed in claim 1, wherein the thermoplastic resin is one of polyester resin, polycarbonate resin, polypropylene resin, polyethylene resin or polyamide resin.

5. The thermoplastic anti-stab-cutting resin sheet formed by gradient inorganic particle sedimentation according to claim 1, wherein the thickness of the thermoplastic anti-stab-cutting resin sheet formed by gradient inorganic particle sedimentation with the gradient distribution structure is 0.2 to 2.0mm, and the thickness of the thermoplastic anti-stab-cutting resin sheet formed by gradient inorganic particle sedimentation with the layered gradient structure is 0.4 to 2.0 mm.

6. The method for producing the inorganic particle gradient sedimentation molded thermoplastic anti-cutting resin sheet according to any one of claims 1 to 5, characterized by comprising the steps of:

(1) Melting thermoplastic resin at high temperature, injecting the melted thermoplastic resin into a polytetrafluoroethylene template slot box, and simultaneously heating the inorganic particles to a temperature 5-10 ℃ above the high temperature; the high temperature is 10-25 ℃ higher than the melting temperature of the used thermoplastic resin;

(2) Then uniformly spreading the inorganic particles required by different stacking densities on the surface of the molten resin layer by layer at one time until the required mass fraction is reached; the temperature of the inorganic particles is 3-8 ℃ higher than that of the inorganic particles in the step (1);

(3) Under the action of constant pressure, slowly immersing the exposed inorganic particles into the molten resin;

(4) And continuously keeping constant pressure and standing for 0.1-1.0 h, raising the temperature of a pressurizing plate to 5-15 ℃ or keeping the temperature of a pressing plate, vacuumizing to remove air bubbles, and gradually cooling and solidifying to form the thermoplastic stab-resistant resin sheet formed by inorganic particles in a gradient distribution structure or a layered gradient structure through gradient sedimentation.

7. The method for producing an inorganic particle gradient sedimentation molded thermoplastic anti-cutting resin sheet according to claim 6, wherein the template well box in the step (1) is a hexagonal, square or circular flat template well box.

8. Use of the inorganic particle gradient sedimentation molded thermoplastic anti-cutting resin sheet according to any one of claims 1 to 5 for individual protection clothing materials for riot, fire, explosion, earthquake search and rescue, and national defense and military.

Technical Field

The invention relates to an individual stab-resistant and cut-resistant dressing material, belongs to the field of functional technical textiles, and particularly relates to a flexible, light and high-efficiency resin composite sheet for stab-resistant, cut-resistant and cut-resistant dressing and a preparation technology thereof.

background

In rescue and escape such as terrorism prevention, riot prevention, fire fighting, sudden change accidents and the like in peace period, and in war or armed activities, specialized protective equipment is needed. The basic requirements of these installations are: high efficacy protective function and light weight, softness and no mobility disorder; the latter are becoming increasingly important and becoming increasingly light and soft. The control of firearms in China is relatively strict, and although the control of cutters also exists, the firearms are easy to acquire and carry about. Therefore, dressing in terrorism and riot control, in particular to a garment with the functions of puncture prevention, cutting, chopping and the like is basic equipment for ensuring the personal safety and the barrier-free action of rescue personnel. The stab-resistance is the most difficult of three functions of stab-resistance, cutting and chopping, and the highest protection function is required, so people mainly pay attention to the stab-resistance. The existing stab-resistant material mainly depends on hard metal to destroy a blade and a sharp blocking device, or uses hard non-metal materials to block and damage a cutter, or uses hard high polymer to extrude and rub to dissipate impact energy. Obviously, a metallic material "hard on hard" has a deficiency in weight; the 'soft to hard' high polymer also has the defects on the cutter baffle; inorganic hard materials, although advantageous in terms of hardness, are brittle and easily broken. How to combine the two is a field which is rarely related to people at present. Much of the research has focused on fabric coatings and resin sheet-to-fabric bonding techniques. Under the current process technology and raw material properties, the stab-resistant effect can only be achieved by means of thickened laminate materials and increased mass of the substances and by means of material hardness selection, which is a low-grade, initial stage. The best effect it can achieve at present is a fabric square meter weight of 6.67kg/m minimum with no apparent penetration (national standard) at 24 joules impact force²i.e. 2kg of vest with 0.3 square meter. The minimum weight is 3.33kg/m if the maximum exposure length allowed to penetrate is 7mm (European standard)²I.e. 1kg of vest with 0.3 square meter.

Many studies on the above-mentioned anti-cutting materials have been conducted at present, mainly focusing on the following ones.

The first is to form a stab-resistant layer using a thermosetting resin or a thermoplastic material to achieve a stab-resistant effect. For example, a method for using a thermoplastic resin coating on nonmetal bulletproof stab-resistant armor (patent publication No. CN201577566U), and adopting a fiber precise arrangement technology to arrange aramid non-woven fabric at 0 degree/90 degree to achieve the bulletproof effect; a bulletproof and stab-resistant vest (patent publication No. CN203657618U) is formed by hot-pressing and curing a protective sheet of aramid fiber cloth layer impregnated with resin, and has strong toughness and elasticity; an aramid fiber reinforced resin based stab-resistant composite material (patent publication No. CN102632665B) is formed by laminating sheets formed by impregnating aramid fiber fabrics with modified vinyl resin, wherein the sheets are independent from each other, and the hardness and the quality are reduced; ballistic and stab resistant composites (patent publication No. CN107580550A) provide a flexible stab resistant material consisting essentially of three zones forming a composite stab resistant material, wherein a second zone comprising a fabric and an elastomeric or thermoplastic resin serves as a primary stab resistant layer; the high-performance nonmetal stab-resistant sheet (patent publication No. CN105696357A) is prepared by mixing epoxy resin and acetone according to a certain proportion, then mixing the mixture with polyamide according to a certain mass ratio, coating the mixture on two sides of aramid fiber woven fabric, and carrying out mould pressing, drying and curing on the aramid fiber woven fabric, so that the stab-resistant performance becomes more stable, and the stab-resistant performance is relatively strong; the stab-resistant composite material and the preparation method thereof (patent publication No. CN101936684A) adopt high-performance fiber to form a reinforcement, a resin matrix compounded on the reinforcement is made into a single-layer composite material, and resin is independently used as a part of the composite stab-resistant material; the bulletproof and stab-resistant multi-purpose composite material prepared from the multi-layer non-woven fabric and the preparation method (patent publication number: US2013/0219600A1) adopt the non-woven fabric impregnated with resin or filled with the resin to prepare the stab-resistant material through multi-angle layering, and the lock of the non-woven fabric achieves the stab-resistant performance; the puncture-proof protective body with the telescopic function (patent publication No. CN107478095A) provides a puncture-proof structural layer consisting of base cloth and reinforced composite thermoplastic resin sheets, the groups are mutually overlapped in a ladder shape, and the puncture-proof layer has the telescopic function and can improve the protective performance, the softness and the air permeability; bulletproof and stab-resistant structures and protective clothing (patent publication No. CN206832131U) provide a stab-resistant and bulletproof material which comprises fiber layers, fiber layers and resin matrix composite layers, wherein the fiber layers and the fiber layers are arranged at 90 degrees, and the structure is light in weight and does not affect the comfort and flexibility of a wearer; a Z-shaped resin molding flexible stab-resistant fabric and a preparation method thereof (patent publication No. CN105544228B) obtain a Z-shaped resin condensate through a 3D printing technology or an injection molding technology, solidify the Z-shaped resin condensate on ready-made clothes fabric through hot melt adhesive powder, and then dry the Z-shaped resin condensate to obtain the Z-shaped resin molding flexible stab-resistant fabric, and the Z-shaped resin molding flexible stab-resistant fabric has the characteristics of light weight, comfort, flexibility and the like; a composite thermoplastic bulletproof and stab-resistant sheet (patent publication No. CN207180483U) is characterized in that a reinforced thermoplastic material is hot-melted and injection-molded on a bulletproof fiber assembly, through holes are punched in the bulletproof fiber assembly, and part of the reinforced thermoplastic material is hot-melted and infiltrated into the through holes to form a reverse reinforcement to form an integrated structure. The stab-resistant material impregnated or coated with resin described above is required to meet the stab-resistant requirements of the standard GA68-2008 police stab-resistant clothing, and requires a larger mass, a thicker number of layers, and a less flexible material, resulting in a heavy and inflexible wearing because of the presence of only a slightly stiff resin film, which is inefficient in stab-resistance. If the metal layer is directly plated, the metal layer cannot be thickened, so that the weight is increased and the metal layer is easy to crack; and secondly, the sheet is processed, the main function of puncture prevention is still resin, the hardness of the resin is limited, and the weight cannot be reduced as long as the thickness of the sheet is increased.

The second type is that high polymer containing inorganic particles is coated on base cloth such as the existing aramid woven fabric to form a stab-resistant layer so as to achieve the stab-resistant effect. A stab-resistant material, a coating carrier used for the stab-resistant material, and clothes made of the material (patent publication No. EP0972169B1) achieve stab-resistant effect by adhering inorganic particle abrasive grains with the diameter of 0.1-3 mm on the surface of a fabric through polyurethane serving as an adhesive, and stab-resistant particles (patent publication No. US2004/0048536A1) can passivate the penetration depth of a cutter by adhering a certain amount of solid hard particle substances on the surface of a high-performance fiber fabric, wherein the thickness of the coating is 0.1-2 mm; in the puncture-proof composite material (patent publication number: US2007/0105471A1), the puncture-proof performance of the material is improved by coating inorganic particles on the surface of aramid fiber fabric; composite stab-resistant fabric and composite stab-resistant fabricThe preparation method (patent publication No. CN101125040A) adopts carborundum, silicon carbide and the like as reinforcing particles, polyurethane, epoxy resin and the like as binding agents to prepare the composite stab-resistant fabric by arranging coating points with the thickness of 0.1-1 mm on the base cloth at intervals of 2-20 mm, and the texture is very soft and is suitable for processing various stab-resistant clothes; according to the bonding forming method (patent publication No. CN103791778B) of the flexible stab-resistant material and the stab-resistant body, thermoplastic particles or composite reinforced material particles produced by an injection molding process are filled in a mold with the thickness of 3-30 mm, the depth of a mold hole of 0.3-2 mm, the distance between the mold holes is 1-20 mm, and the gap between the mold holes is 0.2-2 mm, and then the flexible stab-resistant material is prepared by uniformly coating a binder or hot melt adhesive powder and curing and bonding the powder on base cloth; a composite bulletproof and stab-resistant material (patent publication No. CN206430639U/CN206648524U) is prepared by coating inorganic powder such as silicon carbide on aramid woven fabric with PU glue to form an inorganic dust coating stab-resistant fabric with a single layer surface density of 150-500 g/m²The number of layers is not more than 10, the weight is basically the lowest level in the existing stab-resistant material, and the inorganic coating stab-resistant cloth or ultrathin stab-resistant steel sheet is used as a stab-resistant layer, and the high-performance fiber woven cloth is used as a bulletproof layer to prepare the bulletproof stab-resistant composite material. A preparation method of flexible material for preventing from cutting and piercing (patent publication No. CN108058469A) further coats the surface of fabric, membrane material, rubber material or leather with adhesive, then pastes organic macromolecule such as epoxy resin or inorganic particle such as diamond and silicon carbide to obtain composite material, then obtains flexible material for preventing from cutting and piercing through hot pressing, the invention has the characteristics of simple process, low cost, light weight and the like; a flexible anti-slash and anti-stab protector (patent publication No. CN207180485U) is made by dividing a reinforced thermoplastic anti-stab sheet material arranged on a base fabric into a plurality of separated particles with flexible gaps, and combining the particles into a particle pattern with protrusions. Although the flexibility of the stab-resistant material formed by coating inorganic particles or adhering pure resin sheets on the surface of the base cloth is improved, the stab-resistant effect is not increased or even reduced. In addition, the former causes surface particles to be continuously rubbed during useThe falling causes the reduction of the anti-stabbing and cutting performance, thereby bringing great potential safety hazard; meanwhile, because the fabric is too thin, the inorganic particle layer is easy to disintegrate and break holes to lose effectiveness, and the extrusion effect of the inorganic particles is basically lost after the cutter is penetrated, and the friction cutting effect is almost disappeared.

The third kind of stab-resistant material is made of traditional woven fabric, knitted fabric or non-woven fabric, and has stab-resistant performance by wrapping, clamping, superposing a hard or flexible shear thickening body or adding a reinforced structure. For example, a hard protective garment disclosed in a hard stab-resistant garment (patent publication No. CN207084185U), in which the inner layer is composed of a high impact polystyrene plate, a high impact polypropylene plate and a foam plastic layer, the inner layer is a detachable metal sheet, and the outer layer is provided with a buffer layer with copper and aluminum strips as reinforcing ribs as a main stab-resistant layer; a flexible stab-resistant fabric and a preparation method thereof (patent publication No. CN107650458A) are characterized in that buffering bulges are introduced to be repeatedly connected and form a wave shape, carbon fiber reinforced material stab-resistant blocks are elaborately layered, and then the fabric is cut, wrapped and sparsely quilted to obtain the flexible stab-resistant fabric; a flexible stab-resistant knitted fabric and a preparation process thereof (patent publication No. CN107587247A) disclose a stab-resistant material prepared by a special knitting process, which comprises floating threads and loop-forming tissues formed by six courses of stitches, and the stab-resistant fabric is prepared by repeated circulation; a preparation method of a soft and durable stab-resistant material (patent publication No. CN107815870A) introduces a shear thickening body to be fully mixed and compounded with a fabric, thereby improving the durability and the flexibility of the stab-resistant material; a flexible stab-resistant material and a preparation method thereof (patent publication No. CN107385676A) disclose a stab-resistant material which comprises a comfort layer 1, a core stab-resistant layer and a comfort layer; 2. the materials are sequentially laminated and then are solidified after being spun-laced to form the stab-resistant composite material. The outstanding disadvantages of the above types of stab-resistant materials are that the processing technology is too complex, the labor cost is high, the mass production is not easy, and when the reinforced material is fiber, the flexibility is improved to some extent, but the stab-resistant function is limited and easy to damage and the weight is increased; when the reinforced material is a metal grid, the flexibility is sharply reduced, the stab-resistant efficiency is related to the grid coarse mesh and the grid space thereof, and the reinforced material is a structure with the quality, the hardness and the flexibility in inverse proportion.

the fourth type of stab-resistant material is a stab-resistant material made of hard or soft materials. A flexible stab-resistant fabric (patent publication No. CN107212485A) uses resin sheets, fiber reinforced resin sheets or metal alloy sheets as protective modules, and achieves stab-resistant effect by gapless fit, greatly improves the flexibility of stab-resistant materials, but is mainly stab-resistant by metal sheets, so the weight is heavier. For example, the anti-stab material is prepared according to various bionics principles, the scale shell splicing type anti-stab clothes (patent publication No. CN108095222A) based on the hollow micro-eggshell is formed by horizontally arranging all anti-stab base plates prepared from plastic materials according to the arrangement layout of upper and lower layers by using the arrangement mode of overlapping the scale shells of animals, and a plurality of hollow semi-ellipsoid shells are arranged on the anti-stab body in a parallel and staggered way, so that the weight of the anti-stab material can be reduced, but the anti-stab effect is influenced by uneven overlapping; the scale-type stab-resistant chip and stab-resistant equipment (patent publication No. CN105403106A) made of the scale-type stab-resistant chip are designed by referring to the scale of crocodile based on the principle of bionics, comprise pyramid and columnar members with sector sections, can well disperse the puncture of sharp instruments such as cutters and the like, and are easy to cause gathering and puncture under the cutting action; the application and preparation method of the nanotube aggregate in the carbon nanotube impact-resistant material (patent publication number: WO2017128944(A1)) utilizes the hollow structure of the carbon nanotube to absorb a large amount of impact energy, the carbon nanotube is in macroscopically ordered and microscopically disordered states, and the optimal puncture-proof and explosion-proof effects are strived to be achieved, but the scale is too small, the rigidity of the material is insufficient, the puncture-proof performance is slightly increased, and the cost is increased; a stab-resistant garment (patent publication No. CN106858769A) based on carbon fiber plate splice blocks is made up of multiple carbon fiber plates, and a stab-resistant sheet made of CNC (computerized numerical control) plate with metal sheet through sewing and sealing. The main deficiency of the stab-resistant material prepared by the scheme is the problem of overlarge quality, and the preparation process is complicated, which is the same as the problem of the early artificial armature manufacturing.

In conclusion, the defects of heavy weight, rigidity and low efficacy of single damping still commonly exist in the existing hard or soft stab-resistant materials.

disclosure of Invention

The invention aims to solve the problems that: in the current research of the stab-resistant material and the stab-resistant mechanism, only a barrier mechanism and a friction holding mechanism are concerned, so that only a hard material is selected and the thickness is increased, and the weight of the material is inevitably increased, or no effective solution is available. The invention is based on the hard material with extremely poor flexibility, large density and heavy weight; the resin material has small density, light weight and good flexibility, so that the particle body, especially the inorganic particle with rigid material, is selected as the main body material (rigid material) for blocking the penetration of the cutter; high polymer materials, especially resin materials with a high degree of hardness, are selected as the body material (flexible material) for gripping and orienting the tool bit and increasing the toughness and elasticity of the material. The combination of the two can not only achieve the combination of rigidity and flexibility of functions and reduce the weight of the material, but also improve the flexibility of the material, and the micron-submicron-scale superhard and single crystal multi-edge-angle microparticles piled in the resin and the dense arrangement and gradient arrangement thereof can effectively realize the reverse cutting mechanism and the collision blocking mechanism of the sharp end of the cutter, and the sharp end of the cutter is subjected to high-probability collision, scraping and holding friction effects, and is quickly passivated and efficiently damped to be static. Therefore, the problems of heavy weight, poor flexibility and the like of the stab-resistant material in the market are effectively solved, and the thermoplastic stab-resistant resin sheet formed by inorganic particle gradient sedimentation and the preparation method and the application thereof are provided aiming at the defects of heavy weight, rigidity and single damping and low effect of the hard or soft stab-resistant material in the prior art.

In order to solve the technical problem, the invention provides a thermoplastic anti-stab-cutting resin sheet formed by inorganic particle gradient sedimentation, which is characterized in that a composite sheet-shaped body is formed by stacking inorganic particles with micron scale in a thermoplastic resin melt, wherein the inorganic particles are in a gradient distribution structure or a layered gradient structure, and cooling and solidifying the composite sheet-shaped body; the gradient distribution structure or the layered gradient structure is a structure formed by naturally settling inorganic particles in a melt of the thermoplastic resin due to self weight and stably solidifying the inorganic particles; the gradient distribution structure refers to a structure filled by inorganic particles with high-density stacking to low-density stacking, even approximately zero inorganic particles; the layered gradient structure comprises a structure filled with inorganic particles and a pure resin layer, wherein the inorganic particles are densely piled to lowly piled and even approximately zero.

preferably, the inorganic particles have an average particle size of 1 to 100 μm, i.e., a mesh size of about 50 to 5000 mesh; the filling mass fraction of the inorganic particles in the anti-cutting resin sheet is 20-45 wt%.

Preferably, the inorganic particles are one or more of silicon carbide particles, artificial diamond particles, boron carbide particles or boron nitride particles.

Preferably, the thermoplastic resin is one of polyester resin (PET), polycarbonate resin (PC), polypropylene resin (PP), polyethylene resin (PE), or polyamide resin (PA).

preferably, the thickness of the thermoplastic stab-resistant resin sheet formed by gradient sedimentation of the inorganic particles with the gradient distribution structure is 0.2-2.0 mm, and the thickness of the thermoplastic stab-resistant resin sheet formed by gradient sedimentation of the inorganic particles with the layered gradient structure is 0.4-2.0 mm.

Obviously, in the gradient distribution area filled with inorganic particles, two levels can be further divided: namely, the stacking density of a local area (namely, a surface layer) is increased due to the pressurization of the inorganic particles, the effective sedimentation time of the surface layer is minimum, the structure is not changed for the longest time (because the internal stress of the surface layer needs to be released layer by layer, and sedimentation also needs to be finished layer by layer), and the sedimentation of the inorganic particles is only generated from the bottom to the top, so that a gradient layer is formed.

The thermoplastic anti-cutting resin sheet of the two types of gradient distribution structure and layered gradient structure has directionality in use.

The lower surface is a front surface, namely the lower surface is penetrated towards the cutter, so that the speed reduction and energy consumption of collision, scraping and extrusion friction of the cutter in an equal acceleration mode can be realized until the cutter is static and cannot penetrate; but also can orient the cutter to realize the collision of the maximum resistance on the moving track of the tip end one by one.

When the upper surface is a front surface, namely the high-density penetration facing the cutter, the cutter can directly and highly probabilistically collide, extrude and scrape the baffle, reduce the speed and consume energy until the cutter is static and can not penetrate, but the directional orientation function of the cutter tip is poor, and the upper surface layer is easy to bend to reduce the friction and scraping effects.

The preparation method of the thermoplastic anti-puncturing resin sheet formed by inorganic particle gradient sedimentation is characterized by comprising the following steps:

(1) Melting thermoplastic resin at high temperature, injecting the melted thermoplastic resin into a polytetrafluoroethylene template slot box, and simultaneously heating the inorganic particles to a temperature 5-10 ℃ above the high temperature; the high temperature is 10-25 ℃ higher than the melting temperature of the used thermoplastic resin;

(2) Then uniformly spreading the inorganic particles required by different stacking densities on the surface of the molten resin layer by layer at one time until the required mass fraction is reached; the temperature of the inorganic particles is 3-8 ℃ higher than that of the inorganic particles in the step (1);

(3) under the action of constant pressure, slowly immersing the exposed inorganic particles into the molten resin;

(4) and continuously keeping constant pressure and standing for 0.1-1.0 h, raising the temperature of a pressurizing plate to 5-15 ℃ or keeping the temperature of a pressing plate, vacuumizing to remove air bubbles, and gradually cooling and solidifying to form the thermoplastic stab-resistant resin sheet formed by inorganic particles in a gradient distribution structure or a layered gradient structure through gradient sedimentation.

Preferably, the template slot box in the step (1) is a hexagonal, square or round flat template slot box.

The thermoplastic anti-puncturing resin sheet formed by gradient sedimentation of the inorganic particles is applied to individual protection dressing materials for anti-riot, fire protection, explosion, earthquake search and rescue and national defense and military.

The trajectory of the tool of the present invention cannot be deviated or inclined, and the backward cutting collision barrier and various frictional effects of the collided inorganic particles are maximized. In the step (5), the purpose of making the temperature of the pressing plate consistent with the ambient temperature or even slightly lower is to ensure that the fluidity of the resin on the surface layer tends to be extremely small, and the inorganic particles cannot sink to ensure the high stacking density of the surface layer and the unchanged surface layer, and simultaneously, the standing time is properly shortened to quickly start the cooling and curing process, so that the resin sheet with a quasi-three-layer structure of a dense surface layer without inorganic particles, a remarkable inorganic particle gradient distribution layer and a pure resin layer is formed. The structure can ensure that the cutter is directionally penetrated and has high stability, so that when collision, cutting and friction occur, the action of an acting point is high, the impact force is strong, the avoidance possibility is small, or the energy for avoiding is high, which is the design purpose of the structure.

The invention has the beneficial effects that:

(1) The density of the resin and the inorganic particles is far lower than that of metal, particularly hard metal, but the hardness of the inorganic particles is generally much higher than that of the hard metal and is 6-20 times higher than that of the hard metal. The quality of the resin sheet with the same puncture-proof effect can be reduced by times, and light puncture-proof, cutting, chopping and composite materials thereof are prepared;

(2) Because the inorganic particles can be filled to 45% -55%, and the inorganic particles are mostly polygonal, the size of a sharp corner is micron scale and is smaller than or far smaller than the cutting edge or the tip of a common cutter, and simultaneously, the hardness of the inorganic particles is far harder than that of a metal cutter, including high-hardness metal, the inorganic particles can cut into the cutting edge of the cutter to form reverse cutting and passivate the tip and the cutting edge.

(3) Because a density gradient distribution structure and a density gradient distribution layered structure are adopted, the toughness of the side with low density of the resin sheet is higher, the strength of the side with high density is stronger, the inorganic particles can be independently controlled by temperature and time to form gradient distribution, so that efficient reverse cutting and rapid blocking and speed reduction of the high-density layer to the cutter are obtained, and the weight can be further reduced;

(4) The preparation process is simple, the temperature can directly adjust the fluidity and the curing point of the thermoplastic resin, so the preparation period is shorter, and the industrialization can be directly carried out.

Drawings

FIG. 1 is a schematic view of a process for preparing a thermoplastic resin sheet of the present invention; wherein: 1-inorganic particles; 2-a thermoplastic resin; and 3, pressing the plate.

FIG. 2 is a schematic cross-sectional view of a gradient-structured inorganic particle gradient-settled formed thermoplastic puncture resistant resin sheet; wherein, 1-inorganic particles; 2-a thermoplastic resin; 3-compacting the surface layer; 4-gradient layer;

FIG. 3 is a schematic cross-sectional structure of a thermoplastic stab-resistant resin sheet formed by inorganic particle gradient sedimentation with a layered gradient structure; wherein, 1-inorganic particles; 2-a thermoplastic resin; 3-compacting the surface layer; 4-gradient layer; 5-pure resin layer.

Detailed Description

The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.