CN112644132A - High-hardness and high-weather-resistance polycarbonate composite board with excellent impact resistance and preparation method thereof - Google Patents

High-hardness and high-weather-resistance polycarbonate composite board with excellent impact resistance and preparation method thereof Download PDF

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Publication number
CN112644132A
CN112644132A CN202011546328.5A CN202011546328A CN112644132A CN 112644132 A CN112644132 A CN 112644132A CN 202011546328 A CN202011546328 A CN 202011546328A CN 112644132 A CN112644132 A CN 112644132A
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polycarbonate
layer
coating
composite
composite board
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王春敏
孙亚峰
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Jiaxing Lingke Material Technology Co ltd
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Jiaxing Lingke Material Technology 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B32B27/365—Layered products comprising a layer of synthetic resin comprising polyesters comprising polycarbonates
    • 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
    • B32B27/08—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 of synthetic resin
    • 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
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • 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
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • 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
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
    • B32B37/153—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediately laminated while in semi-molten state
    • 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
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
    • 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
    • B32B38/0012—Mechanical treatment, e.g. roughening, deforming, stretching
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/10—Esters; Ether-esters
    • C08K5/12—Esters; Ether-esters of cyclic polycarboxylic acids
    • 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
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
    • B32B2037/243—Coating
    • 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
    • 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/20—Inorganic coating
    • 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/306—Resistant to heat
    • B32B2307/3065—Flame resistant or retardant, fire resistant or retardant
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/536—Hardness
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/54—Yield strength; Tensile strength
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/554—Wear resistance
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/558—Impact strength, toughness
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/584—Scratch resistance
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/712—Weather resistant
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention discloses a high-hardness and high-weather-resistance polycarbonate composite board with excellent impact resistance, which comprises a composite board body and a surface coating structure; the plate body comprises an inner layer and an outer layer; the inner layer and the outer layer form a composite layer in a melting and coextrusion mode; the inner layer is a common polycarbonate material layer, and the outer layer is a polycarbonate material layer containing a photoactive additive; the surface coating structure is coated on the surface of the composite board body. According to the invention, a large-size composite film and a large-size composite plate product are prepared by compounding an extruder set and a composite die head in a multi-layer co-extrusion mode and cooling and thickness-fixing by a shaping roller set, so that the prepared composite plate has the characteristics of transparency, high strength and impact resistance of common polycarbonate and weather resistance and high hardness of an optical activity crosslinkable polycarbonate material, and the final product has good impact resistance and strength.

Description

High-hardness and high-weather-resistance polycarbonate composite board with excellent impact resistance and preparation method thereof
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a high-hardness and high-weather-resistance polycarbonate composite board with excellent impact resistance and a preparation method thereof.
Background
Polycarbonate (PC) has excellent mechanical properties including impact resistance, thermal stability, natural flame retardancy, and optical properties such as light transmittance, etc. These materials are therefore widely used in a variety of different applications, for example in mechanical or structural parts, aeronautical and rail transit parts, vehicle windows or architectural lighting windows, and in optical applications, such as lenses, optical storage disks, and optical fibers, among others. However, because of the low hardness and poor weatherability of common polycarbonates per se, articles made from polycarbonate often exhibit limitations for outdoor use, which are undesirable for applications such as vehicle windows, cell phone screens, vending machine screens, outdoor electronic device housings, and advertising signs. Therefore, it is necessary to modify the surface of polycarbonate materials or modify the materials to improve the hardness and weather resistance of the surface.
The surface modification method generally used is to cover a hardened coating layer, such as a surface coating layer of a silicone substrate or an acrylic substrate, on a polycarbonate sheet or film, and to compensate for this defect by using the excellent weather resistance and high hardness of the silicone or acrylic material after curing. Or a novel synthesis technology or a blending technology can be adopted to introduce other rigid polymer chain segments into the polycarbonate material so as to improve the hardness and the weather resistance of the material. For example, SABIC introduces organosilicon chain segments into the synthesis process of polycarbonate, thereby forming a copolymer system of organosilicon and bisphenol A, and greatly improving the low-temperature impact resistance and weather resistance of the material. While additives containing photoactive groups, such as monofunctional groups (e.g., ITR, which is an ester unit formed by the polycondensation of m/terephthalic acid and resorcinol) are incorporated into polycarbonate to form blends, when exposed to ultraviolet radiation, crosslinking will occur between the photoactive additive and the polymer resin, thereby increasing the surface hardness of the polymer, improving weatherability and flame retardancy.
However, the surface coating method requires special subsequent coating processing, the formed coating is often brittle, so that the impact resistance of the polycarbonate plate subjected to surface treatment is reduced, and in addition, the hardness of the plate or film is limited by the thickness of the coating and often cannot meet the requirements of objective application; in addition, the surface coating method is not only cost effective, but also undesirable for recycling and environmental protection purposes. The novel synthesis or blending technology is extremely high in cost, the price is 5-10 times that of the common polycarbonate material, subsequent processing of the material is difficult, and the performance of a finished product is limited in some aspects, for example, the light transmittance of the material formed by the organic silicon-polycarbonate copolymer is reduced compared with that of the common polycarbonate, and the clarity of the material is also deteriorated due to the existence of organic silicon functional groups. While blends of photoactive ITR-BPA groups often lead to yellowing of the base color of the material. In addition, the novel polycarbonate material prepared by the synthesis or blending technology has relatively limited improvement of surface hardness, and often has poor wear resistance and chemical resistance, which brings various disadvantages to the application of mobile phone screens, outdoor electronic equipment shells, vehicle windows and the like.
In recent years, with the development of personal mobile communication equipment, a PC and PMMA co-extruded composite plate also starts to gradually enter the market, the plate utilizes the higher hardness and the better chemical resistance of a PMMA material, a PMMA layer with the thickness of 10-150 microns is covered on the surface of polycarbonate in a co-extrusion coating mode in the processing process, and then an organic silicon or acrylic coating is formed on the surface of PMMA through surface coating processing, so that the hardness and the chemical resistance of the whole composite plate are improved. However, since PMMA and PC are two polymer materials with different properties, the processing temperature, the material shrinkage deformation, the water absorption rate, the glass transition temperature and the like have great differences. The scheme has relatively complex process, high requirements on equipment temperature control and processing precision, and difficult subsequent hot forming processing of the obtained plate due to different glass transition points of PC and PMMA. The prepared composite board and the leftover materials can not be recycled, and the aims of circular economy and environmental protection are not met. And PMMA is used as an outer layer material, has poor impact resistance, and is easy to form microcracks in the processes of transportation, cutting or processing and forming, thereby further initiating the cracking and failure of the whole composite board. The defects seriously affect the popularization and the application of the composite board in occasions such as vehicle windows, screens and the like.
Thus, existing solutions generally focus on only a single property, such as weatherability, surface hardness, etc., alone. The prior art lacks a polycarbonate composite plate which can maintain excellent high impact resistance, high transparency and thermal stability and simultaneously has high surface hardness and high weather resistance and a preparation method thereof.
Therefore, in view of the above problems, it is necessary to improve them.
Disclosure of Invention
The invention aims to provide a polycarbonate composite board aiming at the defects in the prior art, which can maintain excellent high impact resistance, high transparency and thermal stability of polycarbonate, and simultaneously meet the requirements of high surface hardness and high weather resistance, and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a high-hardness and high-weather-resistance polycarbonate composite board with excellent impact resistance comprises a composite board body and a surface coating structure; the plate body comprises an inner layer and an outer layer; the inner layer and the outer layer form a composite layer in a melting and coextrusion mode; the inner layer is a common polycarbonate material layer, and the outer layer is a polycarbonate material layer containing a photoactive additive; the surface coating structure is coated on the surface of the composite board body.
In the invention, the surface coating structure is used for further improving the surface hardness of the material and enhancing the wear resistance and chemical resistance; the inner layer common polycarbonate material has proper melt flowability, for example, at 300 ℃ and under the test pressure of 1.2 kilograms, the MVR is 1-15 g/10min, is suitable for extrusion processing of films or plates, and has excellent tensile strength, impact strength, ductility and flame retardant property. The flame retardant property can be realized by adding a flame retardant into a polycarbonate material. The common polycarbonate material can be completely transparent, and can also be added with toner or coloring agent to achieve the effect of color or translucency; the rigidity, the flexural modulus and the like of the polycarbonate substrate can also be improved by adding inorganic filler and the like to blend and modify common polycarbonate materials.
Preferably, the thickness of the polycarbonate material of which the outer layer contains the photoactive additive is 0.03-1 mm.
Preferably, the thickness of the inner layer common polycarbonate material is 0.03 mm-20 mm.
Preferably, the photoactive additive includes, but is not limited to, monofunctional isophthalic acid isophthalate.
In the invention, monofunctional ITR is introduced into polycarbonate to form a blend, when the blend is exposed to sunlight, ITR groups automatically rearrange to form hydroxy-p/m-phthalic acid m-xylenol ester which enters a polymer chain segment and can absorb ultraviolet light and near ultraviolet light; the photoactive additive and the polymer resin are crosslinked, so that the surface hardness of the polymer is improved, and the weather resistance and the flame retardance are improved.
Preferably, the surface coating is any one of polyurethane coating, inorganic nano ceramic coating, ultraviolet curing coating and acrylic coating.
In the invention, the selected surface coating can be any one of polyurethane coating, inorganic nano ceramic coating, ultraviolet curing coating and acrylic coating, wherein the acrylic coating has the advantages of good mechanical property, hard coating, good flexibility, excellent wear resistance, good adhesive force and the like; for example, this formulation: acrylic monomer 1 (3-15%) which plays a role in diluting coating liquid and increasing adhesion force, acrylic monomer 2 (10-25%) which increases coating hardness and toughness, acrylic monomer 3 (8-20%) which improves coating surface hardness and wear resistance, diluent 50-85% and photoinitiator 1-4%.
The selected surface coating can be ultraviolet light curing coating; the formulation of uv curable coating systems generally consists of a uv curable prepolymer and a reactive diluent. The nano silicon dioxide and the silane modified acrylic resin are added into the coating, so that the hardness and the scratch resistance of the ultraviolet curing coating after curing can be further improved;
the selected surface coating can also be a nano ceramic coating; the coating is a system taking inorganic compounds as raw materials, generally selecting compounds such as nano oxides, nitrides, carbides and the like, wherein the inorganic nanoparticles account for about 50-90% of the coating and are the main film forming materials of the coating. The continuous matrix of the coating is composed of an organosilicon compound containing a backbone of silicon-oxygen bonds. For example, trimethylethoxysilane is used as a film forming material, tetraethoxysilane is used as a reinforcement, and 70-80% of nano silicon dioxide phase by volume ratio is added to form an organic/inorganic hybrid system.
The invention also provides a preparation method of the high-hardness and high-weather-resistance polycarbonate composite board with excellent impact resistance, which comprises the following steps:
s1: respectively putting common polycarbonate and a polycarbonate material containing an optical activity additive into a charging barrel of a main extruder and a charging barrel of an auxiliary extruder, melting the material layers under the screw plasticizing condition, and extruding a polycarbonate melt through a melt distributor and a co-extrusion die head;
s2: the polycarbonate composite plate product is formed by the thickness-fixing cooling of a cooling roller under the traction of a traction device;
s3: then, forming the composite board into a part with a three-dimensional curved surface by adopting a vacuum forming method;
s4: and further attaching a layer of surface coating on the surface of the part with the three-dimensional curved surface by adopting a conventional surface coating process to form a final product.
The invention has the beneficial effects that:
(1) according to the invention, a transparent, high-strength and impact-resistant common polycarbonate layer and a crosslinkable polycarbonate material layer which has excellent weather resistance and higher surface hardness and contains an optical activity additive are combined, and are compounded by an extruder set and a composite die head in a multi-layer co-extrusion mode, and the thickness is determined by cooling through a shaping roller set to prepare large-size composite film and plate products; and then, a coating system with high hardness, high wear resistance and high chemical resistance is attached to the surface of the composite film or the plate through surface coating, so that the optimal matching of the material performance is realized.
(2) The composite board has the characteristics of transparency, high strength and high impact resistance of common polycarbonate and weather resistance and high hardness of an optically active cross-linkable polycarbonate material; meanwhile, as the two materials belong to polycarbonate types, the thermal deformation temperature, the shrinkage rate and the impact resistance of the two materials are relatively close, and the two materials have good coating forming performance in the subsequent coating process, especially under the condition of heating or ultraviolet curing.
(3) The composite board can be used for preparing a product with a three-dimensional curved surface shape by utilizing a die pressing or plastic suction process according to the product requirements, and then a layer of surface coating is further adhered to the surface of the three-dimensional curved surface for hardening by adopting a conventional surface coating process such as spraying, curtain coating or dip coating, so that the final product has the characteristics of impact resistance, high weather resistance, high surface hardness, complex geometric shape and the like.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The test methods or test methods described in the following examples are conventional methods unless otherwise specified; the reagents and materials, unless otherwise indicated, are conventionally obtained commercially or prepared by conventional methods.
Example one
The polycarbonate composite plate of the embodiment comprises a layer of a common transparent polycarbonate substrate with the thickness of 1.5 mm, a layer of polycarbonate material with the thickness of 0.10 mm and containing a photoactive additive on the upper surface and the lower surface of the substrate respectively, and an acrylic photocuring coating with the thickness of 10 microns on the upper surface and the lower surface of the outermost side respectively.
The plate is prepared according to the following steps:
s1: respectively putting the common transparent polycarbonate and the polycarbonate material containing the photoactive additive into a charging barrel of a main extruder and an auxiliary extruder, melting the material layers under the screw plasticizing condition, and extruding a polycarbonate melt through a melt distributor and a co-extrusion die head;
s2: the polycarbonate composite plate product with high surface hardness and high weather resistance is formed by cooling through a cooling roller with fixed thickness under the traction of a traction device;
s3: then, forming parts with simple 3D shapes, such as automobile front windows, engineering vehicle housings, outdoor transparent display shells and the like, from the composite board by adopting a vacuum forming method;
s4: the acrylic coating is used for coating by spraying, and then the coating is hardened and coated on the surface of the part by heating and high-dose ultraviolet curing coating.
In this example, the polycarbonate substrate was an extrusion grade Z1-101R polycarbonate material produced by china blue plastics, and the polycarbonate material containing the photoactive additive was an SLX copolymer produced by SABIC, according to a ratio of 50: blending the mixture with 101R in a ratio of 50 for use; the silicone cured coating employs UVH3000 organic/inorganic hybrid system from mezzanine corporation.
The performance test of the composite board prepared in the embodiment is as shown in table 1:
TABLE 1
Figure BDA0002856403500000071
A polycarbonate composite sheet comprising a generally transparent polycarbonate substrate having a thickness of 2 mm, a layer of polycarbonate material having a photoactive additive thereon having a thickness of 0.15 mm, and a thermally cured polyurethane coating having a thickness of 10 microns on the uppermost surface.
The plate is prepared according to the following steps:
s1: respectively putting the common transparent polycarbonate and the polycarbonate material containing the photoactive additive into a charging barrel of a main extruder and an auxiliary extruder, melting the material layers under the screw plasticizing condition, and extruding a polycarbonate melt through a melt distributor and a co-extrusion die head;
s2: the polycarbonate composite plate product with high surface hardness and high weather resistance is formed by cooling through a cooling roller with fixed thickness under the traction of a traction device;
s3: after the double-component polyurethane coating is mixed, the hardening coating treatment is carried out on the surface of the composite board by adopting a curtain coating mode.
In this example, the polycarbonate substrate was an extrusion grade Z1-101R polycarbonate material produced by china blue plastics, and the polycarbonate material containing the photoactive additive was an SLX copolymer produced by SABIC, according to a 90: 10 and 101R are used after being blended; the polyurethane curing coating adopts a hard polyurethane coating system S7000 of Global the Products company in the United states.
The performance test of the composite board prepared in this example is shown in table 2:
TABLE 2
Figure BDA0002856403500000081
As can be seen from the above examples and performance tests, the composite board prepared by the invention has excellent high impact resistance, high transparency and thermal stability of polycarbonate compared with the common polycarbonate board, and simultaneously satisfies the requirements of high surface hardness and high weather resistance; the preparation method is simple, the subsequent processing is easy, the purposes of circular economy and environmental protection are met, and the product is a product which is worth being widely popularized.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (6)

1. The high-hardness and high-weather-resistance polycarbonate composite board with excellent impact resistance is characterized by comprising a composite board body and a surface coating structure; the plate body comprises an inner layer and an outer layer; the inner layer and the outer layer form a composite layer in a melting and coextrusion mode; the inner layer is a common polycarbonate material layer, and the outer layer is a polycarbonate material layer containing a photoactive additive; the surface coating structure is coated on the surface of the composite board body.
2. The composite board of claim 1, wherein the thickness of the polycarbonate material with the photoactive additive in the outer layer is 0.03-1 mm.
3. The composite board as claimed in claim 1, wherein the thickness of the inner layer of the general polycarbonate material is 0.03mm to 20 mm.
4. The composite sheet material of any one of claims 1-3, wherein the photoactive additive includes, but is not limited to, monofunctional isophthalate.
5. The composite board as claimed in claim 1, wherein the surface coating is any one of polyurethane coating, inorganic nano ceramic coating, ultraviolet light curing coating and acrylic coating.
6. The method of manufacturing a composite sheet material according to claim 1, comprising the steps of:
s1: respectively putting common polycarbonate and a polycarbonate material containing an optical activity additive into a charging barrel of a main extruder and a charging barrel of an auxiliary extruder, melting the material layers under the screw plasticizing condition, and extruding a polycarbonate melt through a melt distributor and a co-extrusion die head;
s2: the polycarbonate composite plate product is formed by the thickness-fixing cooling of a cooling roller under the traction of a traction device;
s3: then, forming the composite board into a part with a three-dimensional curved surface by adopting a mould pressing or vacuum forming method;
s4: and further attaching a layer of surface coating on the surface of the part with the three-dimensional curved surface by adopting a conventional surface coating process to form a final product.
CN202011546328.5A 2020-12-24 2020-12-24 High-hardness and high-weather-resistance polycarbonate composite board with excellent impact resistance and preparation method thereof Pending CN112644132A (en)

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