CN111907153A - TPU (thermoplastic polyurethane) modified impact-resistant transparent composite material and preparation method thereof - Google Patents

TPU (thermoplastic polyurethane) modified impact-resistant transparent composite material and preparation method thereof Download PDF

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CN111907153A
CN111907153A CN202010893480.4A CN202010893480A CN111907153A CN 111907153 A CN111907153 A CN 111907153A CN 202010893480 A CN202010893480 A CN 202010893480A CN 111907153 A CN111907153 A CN 111907153A
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composite material
tpu
thermoplastic polyurethane
modified impact
resistant transparent
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刘亚辉
陈淑海
肖培栋
刘凯良
高振胜
王丹
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Shandong Dongda Inov Polyurethane Co Ltd
Shandong Inov Polyurethane Co Ltd
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Shandong Dongda Inov Polyurethane Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties

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  • Fluid Mechanics (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The invention relates to a TPU modified impact-resistant transparent composite material and a preparation method thereof, belonging to the technical field of composite materials. The TPU modified impact-resistant transparent composite material comprises the following raw materials in parts by mass: 50-70 parts of thermoplastic polyurethane, 50-70 parts of transparent base material and 0.5-1 part of metal oxide; the TPU modified impact-resistant transparent composite material not only has good impact resistance and flame retardant property, but also keeps extremely high transparency, and expands the shell structure to more material fields; the invention also provides a simple and feasible preparation method.

Description

TPU (thermoplastic polyurethane) modified impact-resistant transparent composite material and preparation method thereof
Technical Field
The invention relates to a TPU modified impact-resistant transparent composite material and a preparation method thereof, belonging to the technical field of composite materials.
Background
Due to the unique multi-level layered structure, shells in nature have excellent tensile resistance, impact resistance and sufficient toughness. Compared with artificially synthesized composite materials, the shell not only has outstanding performance, but also has the advantages of maximally utilizing natural resources and minimum energy requirements to construct a complex reinforced structure and the like, so that the simulated shell-shaped composite material is greatly attracted to the eyeballs of researchers. The reason for the enhancement is researched, and the structure of the shell is found to be composed of a large number of inorganic nanosheets and chitin with adhesiveness, and mechanical properties incomparable to the shell are endowed through mechanisms such as sliding, bridging and extraction. At present, a large number of shell-shaped composite materials are prepared, and the method mainly comprises the following methods:
chinese patent CN108912602 discloses a three-dimensional shell-like structure material and a preparation method thereof, wherein aramid nano-fiber and mica sheets are used for preparing the three-dimensional shell-like structure material; chinese patent CN108500263 discloses a rapid forming method of a bionic shell structure titanium-based composite material, which selects titanium wires and boronized titanium wires as raw materials, and alternately deposits the bionic shell structure titanium-based composite material through computer programming; chinese patent CN104275098 discloses a preparation method of a shell-like structure layered graphene oxide nano composite membrane, wherein a certain amount of gellan gum modified graphene oxide dispersion liquid is subjected to vacuum filtration to self-assemble the nano hybrid to form the shell-like structure layered graphene oxide nano composite membrane.
Through the method, although a large number of shell bionic composite materials are prepared, the methods have obvious common points, the production process of the used polymer material is complicated or the preparation process is complex, and the material and the function are single. Intensive research on the shell structure has found that not only a large amount of inorganic substances play a reinforcing role, but also a small amount of organic chitin therein is a key step for promoting high mechanical strength of the shell structure. For synthetic polymer materials, many are too brittle, resulting in insufficient energy absorption, or too strong, resulting in the sheet structure being damaged when subjected to external forces, and ultimately failing to exhibit the true mechanical advantage of the shell structure. The thermoplastic polyurethane is considered to be an ideal substitute for organic matters in the shell structure because of having proper properties of tearing resistance, tensile resistance, toughness, repeated use and the like. With the diversification of material use, the actual artificial synthesis of the shell structure is not limited to the compounding of inorganic matters and organic matters, so that a process which is simple to operate, low in cost and capable of being produced in a large scale is urgently needed for preparing the high-strength and transparent composite material.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects in the prior art and providing a TPU modified impact-resistant transparent composite material which not only has good impact resistance and flame retardant property, but also keeps extremely high transparency, and expands the shell structure to more material fields; the invention also provides a simple and feasible preparation method.
The TPU modified impact-resistant transparent composite material comprises the following raw materials in parts by mass:
50-70 parts of thermoplastic polyurethane,
50-70 parts of a transparent base material,
0.5-1 part of metal oxide;
the transparent substrate is a glass sheet, a polyethylene plate, a polypropylene plate or a polymethyl methacrylate plate.
Preferably, the thermoplastic polyurethane has a hardness of 70A to 60D and a light transmittance of 85 to 93%.
The thermoplastic polyurethane contains one or more additives, and the additives are a mixture of one or more of an antioxidant, an antimicrobial agent, an antibacterial agent, a compatibilizer, an electrical dissipation or antistatic agent, a filler, a reinforcing agent, an impact modifier, a plasticizer, a rheology modifier, a slip additive or a UV stabilizer and a flame retardant.
Preferably, the metal oxide is one or more of aluminum hydroxide, aluminum oxide or magnesium hydroxide.
The preparation method of the TPU modified impact-resistant transparent composite material comprises the following steps:
(1) carving a transparent substrate into a hexagonal structure similar to a graphene structure through a focused pulse laser beam, wherein the carved scribed lines need to be connected to avoid initial separation and can be separated in a later hot pressing process;
(2) uniformly stirring and melting thermoplastic polyurethane and metal oxide particles at 180-230 ℃, spreading a mixed melt (a blade coating machine) on a large-area polytetrafluoroethylene flat plate (at room temperature) while the mixed melt is hot, covering a hexagonal transparent thin plate prepared in the step (1) on the molten thermoplastic polyurethane before the melt is cooled and formed, then spreading a thermoplastic polyurethane melt on a transparent substrate, then spreading the transparent substrate, and repeating the steps for 10-20 times to obtain the preformed TPU modified impact-resistant transparent composite material;
(3) placing the prepared preformed TPU modified impact-resistant transparent composite material for 1-2h under a certain hot pressing state to obtain a final TPU modified impact-resistant transparent composite material, and separating the connected parts of the transparent base materials in the hot pressing process to obtain an independent hexagonal structure.
Preferably, in the step (3), the temperature during hot pressing is 130-.
According to the invention, the transparent base material is carved into a hexagonal structure and then compounded with the thermoplastic polyurethane with excellent mechanical property to simulate the multistage layered structure of the shell, so that the prepared composite material has more excellent impact resistance.
The invention applies the transparent base materials of different materials to the shell structure bionic material, not only expands the raw material range of artificially synthesized shell structures, but also promotes the bionic strategy to be more in line with practical application, and most importantly, the composite materials also keep extremely high transparency and mechanical strength, thereby greatly expanding the application field of the bionic materials.
Compared with the prior art, the invention has the following beneficial effects:
(1) the method breaks through the limitation that the bionic shell structure can only be prepared by using nano-filler and a laboratory scale originally, and expands the method to prepare the composite material with the bionic shell structure by using a macroscopic material as a reinforcing phase;
(2) according to the invention, through ingenious design, the carving nano-sheet base material of the reinforcing phase can be better arranged in the shell bionic structure of the composite material than all the previous methods while the original material is kept to have extremely high transparency, so that the shell bionic composite material is endowed with extremely high impact resistance which is improved by about 2-3 times;
(3) the invention introduces the metal oxide into the adhesion matrix, and endows the adhesion matrix with enough flame retardant property while keeping the adhesion property, wherein the flame retardant property can reach V-0 level;
(4) the invention introduces one or more transparent base materials as a reinforcing phase, and is not limited to the traditional inorganic nanosheets, so that the application range of the bionic composite material is expanded, and the bionic composite material is applied to the fields of transparent windows, automobile windshields, building base materials and the like.
Drawings
FIG. 1 is a schematic representation of the structure of a composite (layered thermoplastic polyurethane/engraved transparent substrate) prepared according to the present invention.
Detailed Description
The present invention is further illustrated by the following examples, which are not intended to limit the practice of the invention.
Example 1
The TPU modified impact-resistant transparent composite material comprises the following raw materials in parts by mass:
50 parts of Thermoplastic Polyurethane (TPU),
50 parts of glass sheets are added, and the weight percentage of the glass sheets is less than 50,
0.5 part of aluminum hydroxide;
the thermoplastic polyurethane is a polyester injection molding grade 70A product T3170 produced by Shandong-Nowegian polyurethane GmbH.
The preparation method comprises the following steps:
(1) 50 parts of glass sheets are carved into a hexagonal structure similar to a graphene structure through a focused pulse laser beam, and the carved scribed lines need to be connected to certain extent finally to avoid initial separation and can be separated in a later hot pressing process;
(2) stirring and melting 50 parts of thermoplastic polyurethane and 0.5 part of aluminum hydroxide particles uniformly at 200 +/-10 ℃, spreading a mixed melt (a blade coating machine) on a large-area polytetrafluoroethylene flat plate (at room temperature) while the mixed melt is hot, covering the hexagonal transparent thin plate prepared in the step (1) on the molten thermoplastic polyurethane before the melt is cooled and formed, spreading a thermoplastic polyurethane melt on a transparent substrate, spreading the transparent substrate, and repeating the steps for 10 times to finally obtain the preformed TPU modified impact-resistant transparent composite material.
(3) And (3) placing the prepared preformed TPU modified impact-resistant transparent composite material for 1h under the hot-pressing state of the temperature of 130 ℃ and the pressure of 3MPa to obtain the final TPU modified impact-resistant transparent composite material, and separating the connected parts of the transparent base materials in the hot-pressing process to obtain an independent hexagonal structure.
Example 2
The TPU modified impact-resistant transparent composite material comprises the following raw materials in parts by mass:
60 parts of Thermoplastic Polyurethane (TPU),
60 parts of polyethylene, namely 60 parts of polyethylene,
0.8 part of aluminum oxide;
the thermoplastic polyurethane is a polyester extrusion grade 85A product E3385 produced by Shandong-Nowei polyurethane corporation
The preparation method comprises the following steps:
(1) 60 parts of polyethylene is carved into a hexagonal structure similar to a graphene structure through a focused pulse laser beam, and the carved scribed lines need to be connected to certain extent finally to avoid initial separation and can be separated in a later hot pressing process;
(2) uniformly stirring and melting 60 parts of thermoplastic polyurethane and 0.8 part of aluminum hydroxide particles at 210 +/-10 ℃, spreading a mixed melt (a blade coating machine) on a large-area polytetrafluoroethylene flat plate (at room temperature) while the mixed melt is hot, covering the hexagonal transparent thin plate prepared in the step (1) on the molten thermoplastic polyurethane before the melt is cooled and formed, then spreading a thermoplastic polyurethane melt on a transparent substrate, then spreading the transparent substrate, and repeating the steps for 15 times to finally obtain the preformed TPU modified impact-resistant transparent composite material.
(3) And (3) placing the prepared preformed TPU modified impact-resistant transparent composite material for 2h under the hot-pressing state of the temperature of 160 ℃ and the pressure of 1MPa to obtain the final TPU modified impact-resistant transparent composite material, and separating the connected parts of the transparent base materials in the hot-pressing process to obtain an independent hexagonal structure.
Example 3
The TPU modified impact-resistant transparent composite material comprises the following raw materials in parts by mass:
70 parts of Thermoplastic Polyurethane (TPU),
70 parts of polypropylene, namely polypropylene, wherein the polypropylene is polypropylene,
1 part of magnesium hydroxide;
the thermoplastic polyurethane was polyester extrusion grade 60D product E298, produced by Shandong-Nowegian polyurethane corporation.
The preparation method comprises the following steps:
(1) 70 parts of polypropylene is carved into a hexagonal structure similar to a graphene structure through a focused pulse laser beam, and the carved scribed lines need to be connected to certain extent finally to avoid initial separation and can be separated in a later hot pressing process;
(2) uniformly stirring and melting 70 parts of thermoplastic polyurethane and 1 part of aluminum hydroxide particles at 220 +/-10 ℃, spreading a mixed melt (a blade coating machine) on a large-area polytetrafluoroethylene flat plate (at room temperature) while the mixed melt is hot, covering the hexagonal transparent thin plate prepared in the step (1) on the molten thermoplastic polyurethane before the melt is not cooled and formed, then spreading a thermoplastic polyurethane melt on a transparent substrate, then spreading the transparent substrate, and repeating the steps for 20 times to finally obtain the preformed TPU modified impact-resistant transparent composite material.
(3) Placing the prepared preformed TPU modified impact-resistant transparent composite material for 1h under the hot-pressing state of the temperature of 150 ℃ and the pressure of 2MPa to obtain the final high-strength transparent composite material, and separating the connected parts of the transparent base materials in the hot-pressing process to obtain an independent hexagonal structure.
Example 4
The TPU modified impact-resistant transparent composite material comprises the following raw materials in parts by mass:
Figure BDA0002657666870000051
the thermoplastic polyurethane is a polyester injection molding grade 70A product T3170 produced by Shandong-Nowegian polyurethane GmbH.
The preparation method comprises the following steps:
(1) 60 parts of polymethyl methacrylate is carved into a hexagonal structure similar to a graphene structure by a focused pulse laser beam, and the carved scribed lines need to be connected to certain extent finally to avoid initial separation and can be separated in a later hot pressing process;
(2) uniformly stirring and melting 60 parts of thermoplastic polyurethane and 0.8 part of aluminum hydroxide particles at 190 +/-10 ℃, spreading a mixed melt (a blade coating machine) on a large-area polytetrafluoroethylene flat plate (at room temperature) while the mixed melt is hot, covering the hexagonal transparent thin plate prepared in the step (1) on the molten thermoplastic polyurethane before the melt is cooled and formed, then spreading a thermoplastic polyurethane melt on a transparent substrate, then spreading the transparent substrate, and repeating the steps for 12 times to finally obtain the preformed TPU modified impact-resistant transparent composite material.
(3) Placing the prepared preformed TPU modified impact-resistant transparent composite material for 2h under the hot-pressing state of the temperature of 138 ℃ and the pressure of 1MPa to obtain the final TPU modified impact-resistant transparent composite material, and separating the connected parts of the transparent base materials in the hot-pressing process to obtain an independent hexagonal structure.
Comparative example 1
50 parts of thermoplastic polyurethane (a polyester injection grade 70A product T3170 produced by Shandong-Nowev polyurethane Co., Ltd.) is stirred at 190 ℃ to be uniformly melted, and the mixed melt is spread (blade coater) on a large-area polytetrafluoroethylene flat plate (at room temperature) while the mixture is hot to prepare a pure polyurethane sheet.
Comparative example 2
50 parts of thermoplastic polyurethane (a polyester extrusion grade 85A product E3385 produced by Shandong-Nonwei polyurethane Co., Ltd.) is stirred and uniformly melted at 190 ℃, the mixed melt is spread on a large-area polytetrafluoroethylene flat plate (at room temperature) when the mixed melt is hot, the whole transparent glass sheet is covered on the molten thermoplastic polyurethane before the melt is cooled and formed, then the thermoplastic polyurethane melt is spread on a transparent substrate, then the transparent substrate is spread, and finally the steps are repeated to obtain the preformed transparent composite material. And (3) placing the prepared preformed transparent composite material for 2 hours under the hot-pressing state at the temperature of 135 ℃ and the pressure of 2MPa to obtain the high-transparency composite material.
Comparative example 3
50 parts of thermoplastic polyurethane (polyester extrusion grade 60D product E298 produced by Shandong-Nonwei polyurethane Co., Ltd.) is stirred and uniformly melted at 190 ℃, the mixed melt is spread on a large-area polytetrafluoroethylene flat plate (at room temperature) when the mixed melt is hot, the whole transparent polyethylene is covered on the molten thermoplastic polyurethane before the melt is cooled and formed, then the thermoplastic polyurethane melt is spread on a transparent substrate, then the transparent substrate is spread, and the steps are repeated to obtain the preformed transparent composite material. And (3) placing the prepared preformed transparent composite material for 2 hours under the hot-pressing state at the temperature of 145 ℃ and the pressure of 1MPa to obtain the high-transparency composite material.
Comparative example 4
50 parts of Thermoplastic Polyurethane (TPU),
0.5 part of aluminum hydroxide;
50 parts of thermoplastic polyurethane (a polyester injection molding grade 70A product T3170 produced by Shandong-one Nonwei polyurethane Co., Ltd.) and 0.5 part of aluminum hydroxide are stirred and melted uniformly at 190 ℃, the mixed melt is spread (blade coating machine) on a large-area polytetrafluoroethylene flat plate (at room temperature) while the mixed melt is hot, the whole piece of transparent polypropylene is covered on the molten thermoplastic polyurethane before the melt is cooled and formed, then the thermoplastic polyurethane melt is spread on a transparent substrate, then the transparent substrate is spread, and the steps are repeated to obtain the preformed transparent composite material. And (3) placing the prepared preformed transparent composite material for 1h under the hot-pressing state at the temperature of 135 ℃ and the pressure of 2MPa to obtain the high-transparency composite material.
Comparative example 5
60 parts of Thermoplastic Polyurethane (TPU),
0.5 part of aluminum hydroxide, namely,
0.3 part of aluminum oxide;
60 parts of thermoplastic polyurethane (a polyester extrusion grade 85A product E3385 produced by Shandong-one Nonwei polyurethane Co., Ltd.) and 0.5 part of aluminum hydroxide and 0.3 part of aluminum oxide particles are stirred at 190 ℃ to be uniformly melted, the mixed melt is spread (blade coating machine) on a large-area polytetrafluoroethylene flat plate (at room temperature) while the mixed melt is hot, the whole piece of transparent polymethyl methacrylate is covered on the melted thermoplastic polyurethane before the melt is cooled and formed, then the thermoplastic polyurethane melt is spread on a transparent substrate, then the transparent substrate is spread, and the steps are repeated to obtain the preformed transparent composite material. And (3) placing the prepared preformed transparent composite material for 2 hours under the hot-pressing state at the temperature of 135 ℃ and the pressure of 2MPa to obtain the high-transparency composite material.
The materials of examples 1-4 and comparative examples 1-5 were tested for performance by the following methods:
(1) transparency: and directly testing the light transmittance and the haze by using a color difference meter.
(2) Puncture energy test: the test is carried out according to American society for testing and materials ASTM D4495-2000 standard.
(3) Flame retardant property: the flame retardant property of the composite material is studied according to GB/T2408-2008 vertical burning test.
The test results are shown in table 1.
TABLE 1 results of material Property test of examples 1 to 4 and comparative examples 1 to 5
Figure BDA0002657666870000071
In the above table, represents combustibles.
As can be seen from fig. 1 and table 1, by simulating the design of the shell structure and the reasonable selection of the reinforced adhesion base material, the finally prepared TPU modified composite material not only has extremely high transparency and flame retardant property, but also has excellent impact resistance compared with the raw material due to the regular and directional arrangement of the reinforced carving nano-sheet base material, and meanwhile, the bionic strategy is more in line with the industrial production, so that the huge advantages which cannot be achieved by the traditional means are shown, and more importantly, the application potential of the composite material in the field of high-transparency protective windows is shown.

Claims (7)

1. The TPU modified impact-resistant transparent composite material is characterized in that: the composite material comprises the following raw materials in parts by mass:
50-70 parts of thermoplastic polyurethane,
50-70 parts of a transparent base material,
0.5-1 part of metal oxide;
the transparent substrate is a glass sheet, a polyethylene plate, a polypropylene plate or a polymethyl methacrylate plate.
2. The TPU-modified impact resistant transparent composite of claim 1, characterized by: the hardness of the thermoplastic polyurethane is 70A-60D, and the light transmittance is 85-93%.
3. The TPU-modified impact resistant transparent composite of claim 1, characterized by: the thermoplastic polyurethane contains one or more additives which are a mixture of one or more of an antioxidant, an antimicrobial agent, an antibacterial agent, a compatibilizer, an electrically dissipative or antistatic agent, a filler, a reinforcing agent, an impact modifier, a plasticizer, a rheology modifier, a slip additive or a UV stabilizer and a flame retardant.
4. The TPU-modified impact resistant transparent composite of claim 1, characterized by: the metal oxide is one or more of aluminum hydroxide, aluminum oxide or magnesium hydroxide.
5. A process for preparing the TPU modified impact resistant transparent composite of any one of claims 1 to 4, characterized in that: the method comprises the following steps:
(1) carving the transparent substrate into a hexagonal structure of a graphene structure;
(2) stirring and melting thermoplastic polyurethane and metal oxide particles, spreading the mixed melt on a polytetrafluoroethylene flat plate while the mixed melt is hot, covering the transparent base material containing the hexagonal structure prepared in the step (1) on the molten thermoplastic polyurethane before the melt is cooled and formed, spreading the thermoplastic polyurethane melt on the transparent base material, then spreading a transparent base plate, and repeating the steps for 10-20 times to obtain the preformed TPU modified impact-resistant transparent composite material;
(3) and (3) placing the preformed TPU modified impact-resistant transparent composite material in a certain hot-pressing state for a period of time to obtain the TPU modified impact-resistant transparent composite material, and separating the connected parts of the transparent base materials in the hot-pressing process to obtain an independent hexagonal structure.
6. The method for preparing the TPU modified impact-resistant transparent composite material according to claim 5, characterized in that: in the step (2), stirring and melting are carried out at 180-230 ℃.
7. The method for preparing the TPU modified impact-resistant transparent composite material according to claim 5, characterized in that: in the step (3), the temperature during hot pressing is 130-160 ℃, the pressure is 1-3MPa, and the mixture is placed for 1-2 h.
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Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5756196A (en) * 1996-12-19 1998-05-26 General Electric Company Composition and method for enhancing the surface adhesion of polyurethane foam to surfaces of thermoplastic blends
US20090263651A1 (en) * 2008-02-06 2009-10-22 Cook Richard L Optically transparent resilient laminate materials and methods of manufacture

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Title
于永忠等: "《阻燃材料手册》", 31 March 1997, 群众出版社 *
宋凡: "生物复合材料中的结构与性能关联", 《第十五届全国复合材料学术会议论文集（上册）》 *
白明敏等: "仿贝壳正六边形Al2O3/环氧树脂层状复合材料的制备与表征", 《陶瓷学报》 *

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Application publication date: 20201110