CN115847975A - Anti-ultraviolet anti-dazzle board and preparation method thereof - Google Patents
Anti-ultraviolet anti-dazzle board and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an anti-ultraviolet anti-dazzle plate and a preparation method thereof, wherein the anti-ultraviolet anti-dazzle plate is of a multilayer structure and comprises a first film layer, an intermediate layer and a second film layer, wherein the intermediate layer comprises the following raw material components in parts by mass: 95-105 parts of unsaturated polyester resin, 120-130 parts of glass fiber or basalt fiber yarn, 1-1.2 parts of initiator, 0.5-1 part of polymerization inhibitor, 8-10 parts of cross-linking agent, 140-160 parts of filler, 2.5-3 parts of thickening agent, 20-24 parts of low-shrinkage additive, 3-4 parts of internal mold release agent, 0.4-0.5 part of anti-aging agent and 2-4 parts of ultraviolet-resistant additive; the first film layer and the second film layer comprise PE films or PP films. The anti-ultraviolet glare plate provided by the invention has good mechanical property and anti-ultraviolet property, and is suitable for highways in plateaus and mountain areas.
Description
Technical Field
The invention relates to the technical field of road traffic facilities, in particular to an anti-ultraviolet anti-glare panel and a preparation method thereof.
Background
In recent years, the development of expressways and expressways is very rapid, and the traffic flow is also increased suddenly. In the night driving process, glare can be generated to the light of vehicles in opposite lanes, so that the sight of drivers at night is influenced, and the safety of road traffic operation at night is influenced. Glare (Dazzle) refers to a visual condition in the visual field due to an unfavorable luminance distribution, or an extreme contrast in luminance in space or time, so as to cause visual discomfort and reduce the visibility of an object. The visual field produces a sense of brightness that the human eye cannot adapt to, and may cause aversion, discomfort or even loss of visibility. An excessively high luminance occurs in a local place in the visual field or an excessively large luminance change occurs in front and rear. Glare is one of the important causes of visual fatigue. The glare shield can solve glare generated by opposite lamps, and is a traffic safety product mainly installed on a central separation belt of a highway or a fast way. The guardrail is mainly arranged on the central separation belt guardrail of the highway or in the middle of the guardrail, and some guardrails are also arranged on the movable guardrail with the central opening.
The solar radiation light contains a large amount of ultraviolet rays, but the sunlight has strong absorption effect on the ultraviolet rays through the atmosphere of the earth in the process of being irradiated to the earth, so that the sunlight only contains a small amount of ultraviolet rays when being irradiated to the surface of the earth. However, the air in the plateau area is thin, and the ultraviolet rays are absorbed by the atmosphere to a small extent, so that the ultraviolet rays emitted to the earth surface are relatively strong. Therefore, on highways in plateau and mountain areas, the performance requirements of the antiglare shield are stricter than those of conventional highways. In particular uv resistance, resistance to deformation, resistance to wind loads and service life. On highways in plateau and mountain areas, the surface of the anti-dazzle plate is more prone to fading, and meanwhile, the mechanical properties such as wind load resistance and the like are integrally reduced, so that the service life of the anti-dazzle plate is shortened.
In the existing anti-dazzle plate, the processing difficulty of the anti-dazzle plate with a road concrete structure is smaller than that of glass fiber reinforced plastics and PVC (polyvinyl chloride), the working performance of the anti-dazzle plate with the road concrete structure is stable under the conditions of exposure to the sun and rain, but the performance of concrete has a large influence on the performance of the anti-dazzle plate, and the anti-dazzle plate with the concrete structure is heavy in weight and not beneficial to transportation and site construction in plateau areas. The concrete is only suitable for being prepared by in-situ pouring, and has long construction time and high construction strength; the steel anti-dazzle board for the highway is hot-dip galvanized and injection-molded, the wind-resistant and impact-resistant hardness is obviously increased, and the service life of the product is prolonged. However, the anti-dazzle plate has the disadvantages of high cost, easy rusting, easy secondary damage and small usability in plateau areas.
Disclosure of Invention
The invention provides an anti-ultraviolet anti-glare plate and a preparation method thereof, and aims to solve the technical problem that the anti-ultraviolet capability and the mechanical property of the anti-glare plate cannot meet the requirements in long-term use on highways in plateaus and mountainous areas.
According to one aspect of the invention, the ultraviolet-resistant antiglare shield is a multilayer structure and comprises a first film layer, an intermediate layer and a second film layer, wherein the intermediate layer comprises the following raw material components in parts by mass: 95-105 parts of unsaturated polyester resin, 120-130 parts of glass fiber or basalt fiber yarn, 1-1.2 parts of initiator, 0.5-1 part of polymerization inhibitor, 8-10 parts of cross-linking agent, 140-160 parts of filler, 2.5-3 parts of thickening agent, 20-24 parts of low-shrinkage additive, 3-4 parts of internal mold release agent, 0.4-0.5 part of anti-aging agent and 2-4 parts of ultraviolet-resistant additive;
the first film layer and the second film layer comprise PE films or PP films.
Further, the intermediate layer comprises the following raw material components in parts by mass: 100 parts of unsaturated polyester resin, 120 parts of glass fiber or basalt fiber yarn, 1 part of initiator, 1 part of polymerization inhibitor, 10 parts of cross-linking agent, 150 parts of filler, 3 parts of thickening agent, 24 parts of low-shrinkage additive, 4 parts of internal mold release agent, 0.4 part of anti-aging agent and 4 parts of ultraviolet resistant additive.
Furthermore, the solid content of the unsaturated polyester resin is 65-70%, the viscosity is 400-900mPa.S, and the acid value is 14-22 mgKOH/g.
Furthermore, the fiber diameter of the glass fiber or the basalt fiber is 13-17 μm, the tensile strength is not less than 0.3N/tex, and the water content is not more than 0.1%.
Further, the initiator comprises benzoyl peroxide, tert-butyl peroxybenzoate or cyclohexanone peroxide; and/or the polymerization inhibitor comprises hydroquinone or hydroquinone; and/or the crosslinking agent comprises styrene, vinyl toluene or methyl methacrylate; and/or the filler comprises calcined kaolin, calcium carbonate or aluminum hydroxide; and/or the thickener comprises calcium hydroxide, magnesium oxide or calcium oxide; and/or the low profile additive comprises heat polyvinyl acetate, polyvinyl chloride or polyethylene; and/or the internal mold release agent comprises zinc stearate or calcium stearate; and/or the anti-aging agent comprises an anti-aging agent IPPD or an anti-aging agent 4010NA; and/or the anti-ultraviolet additive comprises UV-770 or UV-531.
According to another aspect of the present invention, there is also provided a method for manufacturing an ultraviolet ray resistant dazzle prevention plate, comprising the steps of:
s1, uniformly mixing unsaturated polyester resin, an initiator, a polymerization inhibitor, a cross-linking agent, a filler, a thickening agent, a low-shrinkage additive, an internal release agent, an anti-aging agent and an anti-ultraviolet additive to obtain resin paste;
s2, uniformly coating the resin paste on the surface of the first film, soaking glass fibers or basalt fibers in the resin paste, and paving a second film on the surface of the resin paste soaked with the glass fibers or the basalt fibers to obtain a composite tape, wherein the first film and the second film comprise PE films or PP films;
s3, carrying out dipping, defoaming and compacting treatment on the composite belt to obtain a sheet;
and S4, curing and molding the sheet to obtain the ultraviolet-resistant anti-dazzle plate.
Further, step S1 includes: firstly, uniformly mixing unsaturated polyester resin, a cross-linking agent and a low-shrinkage additive to obtain a mixture A; adding an initiator and a polymerization inhibitor into the mixture A and uniformly stirring to obtain a mixture B; adding an internal release agent into the mixture B and uniformly stirring to obtain a mixture C; adding a cross-linking agent, an anti-aging agent and an anti-ultraviolet additive into the mixture C, and uniformly stirring to obtain a mixture D; and finally, adding the filler and the thickening agent into the mixture D, and uniformly stirring to obtain the resin paste.
Further, the viscosity of the obtained resin paste is 1000 to 1500 mPas.
Further, in step S4, the aging treatment comprises aging at 35-40 ℃ for 1-2 days, or aging at 20-22 ℃ for 7-14 days.
Further, the cured sheet has a viscosity of 2 to 6X 10 4 Pa.S。
The invention has the following beneficial effects:
the polyester molecules in the unsaturated polyester resin in the raw materials of the intermediate layer of the ultraviolet-resistant anti-dazzle board provided by the application are subjected to copolymerization reaction with the cross-linking agent, and the polyester resin molecules are subjected to self-polymerization cross-linking curing through the cross-linking monomer and are combined with the reinforcing fibers under the reaction of other auxiliary agents to form a product with excellent mechanical properties. Specifically, the curing degree of the product is determined by adding an initiator into the formula; the polymerization inhibitor can prevent the resin from being polymerized prematurely and prolong the storage time; the thickening agent can perform acid-base reaction with the polyester end group of the unsaturated polyester resin, so that dehydration is realized, and the resin viscosity is improved; because the unsaturated polyester resin product has a certain degree of contractibility after being cured, the low-contraction additive can reduce the curing contraction; the filler can improve the surface quality; the internal mold release agent ensures that the product can be smoothly released; the anti-ultraviolet additive and the anti-aging agent can improve the corresponding anti-ultraviolet performance and the service life of the product.
According to the preparation method of the ultraviolet-resistant anti-dazzle plate, the first film, the second film and the middle layer are overlapped to form a multilayer structure, the wettability of glass fiber or basalt fiber can be improved to the maximum extent by the multilayer structure, the raw materials are further uniformly mixed in the extrusion process, and the compactness of a sheet is improved; the ultraviolet-resistant anti-glare panel with excellent mechanical property is obtained after the sheet is cured and molded.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is an external view of an ultraviolet ray resistant dazzle prevention plate of embodiment 1 of the invention.
Detailed Description
In order to make the objects, technical solutions and advantageous technical effects of the present invention more clear, the present invention is further described in detail with reference to the following embodiments. It should be understood that the embodiments described in this specification are only for the purpose of explaining the present invention and are not intended to limit the present invention.
For the sake of brevity, only some numerical ranges are explicitly disclosed herein. However, any lower limit may be combined with any upper limit to form ranges not explicitly recited; and any lower limit may be combined with any other lower limit to form a range not explicitly recited, and similarly any upper limit may be combined with any other upper limit to form a range not explicitly recited. Also, although not explicitly recited, each point or individual value between endpoints of a range is encompassed within the range. Thus, each point or individual value can form a range not explicitly recited as its own lower or upper limit in combination with any other point or individual value or in combination with other lower or upper limits.
In the description herein, it is to be noted that, unless otherwise specified, "above" and "below" are inclusive, and "a plurality" of "one or more" means two or more.
The embodiment of the first aspect of the application provides an ultraviolet-resistant antiglare shield which is a multilayer structure and comprises a first film layer, an intermediate layer and a second film layer, wherein the intermediate layer comprises the following raw material components in parts by mass: 95-105 parts of unsaturated polyester resin, 120-130 parts of glass fiber or basalt fiber, 1-1.2 parts of initiator, 0.5-1 part of polymerization inhibitor, 8-10 parts of cross-linking agent, 140-160 parts of filler, 2.5-3 parts of thickener, 20-24 parts of low-shrinkage additive, 3-4 parts of internal mold release agent, 0.4-0.5 part of anti-aging agent and 2-4 parts of ultraviolet-resistant additive;
the first film layer and the second film layer comprise PE films or PP films.
The polyester molecules in the unsaturated polyester resin in the raw materials of the intermediate layer of the ultraviolet-resistant anti-dazzle board provided by the application are subjected to copolymerization reaction with the cross-linking agent, and the polyester resin molecules are subjected to self-polymerization cross-linking curing through the cross-linking monomer and are combined with the reinforcing fibers under the reaction of other auxiliary agents to form a product with excellent mechanical properties. The curing degree of the product is determined by adding an initiator into the formula; the polymerization inhibitor can prevent the resin from being polymerized prematurely and prolong the storage time; the thickening agent can perform acid-base reaction with the polyester end group of the unsaturated polyester resin, so that dehydration is realized, and the resin viscosity is improved; because the unsaturated polyester resin product has certain shrinkage after being cured, the low shrinkage additive can reduce curing shrinkage; the filler can improve the surface quality; the internal mold release agent ensures that the product can be smoothly released; the anti-ultraviolet additive and the anti-aging agent can improve the corresponding anti-ultraviolet performance and the service life of the product.
The basalt fiber and the glass fiber are also used as reinforcing materials, are formed by drawing different ores through a bushing plate under high-temperature melting, and have the forming capability of being combined with a resin matrix.
In some embodiments, the intermediate layer comprises the following raw material components in parts by mass: 100 parts of unsaturated polyester resin, 120 parts of glass fiber or basalt fiber yarn, 1 part of initiator, 1 part of polymerization inhibitor, 10 parts of cross-linking agent, 150 parts of filler, 3 parts of thickening agent, 24 parts of low-shrinkage additive, 4 parts of internal mold release agent, 0.4 part of anti-aging agent and 4 parts of ultraviolet resistant additive.
In some embodiments, the unsaturated polyester resin has a solids content of 65 to 70%, a viscosity of 400 to 900mpa.s, and an acid value of 14 to 22mgKOH/g.
The resin viscosity can reflect the fluidity of the resin, and the wettability and permeability of the resin are better at the viscosity; the acid value has influence on the reaction degree of the resin and is an index of the reaction degree; the solid content is the purity of the resin, which affects the molded product, and should not be too large or too small. In the present invention, the use of the above resin in combination with other auxiliaries enables stable reaction to form an article.
In some embodiments, the glass fibers or basalt fibers have a fiber diameter of 13 to 17 μm, a tensile strength of not less than 0.3N/tex, and a moisture content of not more than 0.1%.
In general, the smaller the fiber diameter, the higher the fiber tensile properties; the mechanical property of the fiber can determine the performance of the product to a certain extent; the water content of the fiber needs to be controlled, otherwise, the mechanical property of the product is influenced by the high water content. In the present invention, the use of fibers satisfying the above conditions as a reinforcing material can improve the product properties.
In some embodiments, the initiator comprises benzoyl peroxide, t-butyl peroxybenzoate, or cyclohexanone peroxide, which does not decompose at room temperature, is safe to store, and provides a long shelf life for the article being produced.
In some embodiments, the polymerization inhibitor comprises hydroquinone or hydroquinone, which can extend the shelf life of the sheet, and which can function at the critical temperatures of the initiator and the resin without affecting the cure time of the resin.
In some embodiments, the crosslinking agent comprises styrene, vinyl toluene, or methyl methacrylate, which are of the type described above that have low shrinkage, high thermal strength, and toughness.
In some embodiments, the filler comprises calcined kaolin, calcium carbonate, or aluminum hydroxide, of the type described above, which is low cost and can improve the apparent quality of the article;
in some embodiments, the thickener comprises calcium hydroxide, magnesium oxide, or calcium oxide, which may also be other metal oxides or hydroxides.
In some embodiments, the low profile additive comprises a thermoplastic high molecular weight polymer, for example, polyvinyl acetate, polyvinyl chloride, or polyethylene, among others.
In some embodiments, the internal mold release agent comprises zinc stearate or calcium stearate, which have a melting point below the molding temperature and are compatible with the resin, but not the cured resin.
In some embodiments, the aging resistor comprises an aging resistor IPPD or an aging resistor 4010NA, and the aging resistor is pollution-free, non-toxic and does not affect the color of the product.
In some embodiments, the anti-UV additive comprises UV-770 or UV-531, which are low cost, capable of absorbing a wide range of UV wavelengths, and have a large absorption coefficient.
In some embodiments, the calcined kaolin has a particle size of 4000 to 6000 mesh; the granularity of the calcium carbonate is 2000-2500 meshes; the particle size of the thermoplastic high molecular polymer is less than 30 μm, wherein the polystyrene content is 35-40%.
In the embodiment of the invention, in order to improve the anti-dazzle effect of the anti-dazzle plate, special oily color paste is selected to replace an ultraviolet-resistant additive, for example, green color paste is adopted for the anti-dazzle plate, so that the ultraviolet resistance is improved.
The embodiment of the second aspect of the application provides a preparation method of an ultraviolet-resistant glare-proof plate, which comprises the following steps:
s1, uniformly mixing unsaturated polyester resin, an initiator, a cross-linking agent, a filler, a thickening agent, a low-shrinkage additive, an internal release agent, an anti-aging agent and an anti-ultraviolet additive to obtain resin paste;
s2, uniformly coating the resin paste on the surface of a first film, soaking glass fibers or basalt fibers in the uniformly coated resin paste, and laying a second film on the surface of the resin paste soaked with the glass fibers or basalt fibers to obtain a composite tape, wherein the first film and the second film comprise PE films or PP films;
s3, carrying out dipping, defoaming and compacting treatment on the composite belt to obtain a sheet;
and S4, curing and molding the sheet to obtain the ultraviolet-resistant anti-glare panel.
According to the preparation method of the ultraviolet-resistant anti-dazzle plate, the first film, the second film and the middle layer are overlapped to form a multilayer structure, the wettability of glass fiber or basalt fiber can be improved to the maximum extent by the multilayer structure, the raw materials are further uniformly mixed in the extrusion process, and the compactness of a sheet is improved; the sheet is cured and molded to obtain the ultraviolet-resistant anti-dazzle board with excellent mechanical property.
In an embodiment of the present invention, step S1 includes: firstly, uniformly mixing unsaturated polyester resin, a cross-linking agent and a low-shrinkage additive to obtain a mixture A; adding an initiator and a polymerization inhibitor into the mixture A and uniformly stirring to obtain a mixture B; adding an internal release agent into the mixture B and uniformly stirring to obtain a mixture C; adding a cross-linking agent, an anti-aging agent and an anti-ultraviolet additive into the mixture C, and uniformly stirring to obtain a mixture D; and finally, adding the filler and the thickening agent into the mixture D, and uniformly stirring to obtain the resin paste.
According to the embodiment of the application, the step S1 can ensure that the resin can fully react with other additives, is beneficial to the exertion of the functions of other additives, avoids the adverse synergistic reaction of the additives, and improves the mixing and dispersing speed.
In the examples of the present invention, the viscosity of the obtained resin paste is 1000 to 1500mp · s, for example, 1000, 1100, 1200, 1300, 1400 or 1500mp · s, and the viscosity of the resin paste may be in any combination of the above values.
According to the embodiment of the present application, the resin paste having the above viscosity has a certain fluidity, and at the same time, fibers can be more well impregnated between films to be bonded to the films.
In the embodiment of the present invention, the aging treatment in step S4 includes aging at 35 to 40 ℃ for 1 to 2 days, or aging at 20 to 22 ℃ for 7 to 14 days. The fiber layer that the inside of cured sheet flows can flow to each region, guarantees that the finished product is balanced, improves the pleasing to the eye degree of outward appearance, improves the stability of performance.
In the examples of the present invention, the cured sheet had a viscosity of 2 to 6X 10 4 Pa.S. Sheet viscosities in the above range can be compression molded.
In some embodiments, a method for preparing an ultraviolet resistant glare shield, comprising the steps of:
(1) Selecting raw materials:
preparing raw materials according to the mixture ratio of the raw materials: unsaturated polyester resin, glass fiber or basalt fiber, benzoyl peroxide, hydroquinone, styrene, calcined kaolin, calcium hydroxide, a low-shrinkage additive, zinc stearate, an anti-aging agent and an anti-ultraviolet additive.
(2) Preparation of resin paste:
baking the solid powder additive at the temperature of 60-80 ℃ for 10 minutes to remove internal moisture, removing residual large particles after baking, and screening by using a sieve; the unsaturated polyester resin, the styrene and the low-shrinkage additive are uniformly mixed, and the stirring speed is started to be 200-300 r/min. Weighing the weight of each raw material, adding an initiator and a polymerization inhibitor into an unsaturated polyester resin batching barrel, increasing the stirring speed to 500r/min, and stirring for 2-3 min to disperse the raw materials in the unsaturated polyester resin; then adding the release agent into a stirring barrel in a slow-first and fast-second mode, wherein the stirring time is controlled to be 3-5 min; adding the cross-linking agent, the anti-aging agent and the ultraviolet-resistant additive into a mixing barrel, and stirring at a stirring speed of 600-700r/min for 1 minute; finally, the filler and the thickening agent are added and stirred for 5 to 8 minutes to complete stirring.
The room temperature in the stirring mode is controlled to be 22-25 ℃. If the temperature in summer exceeds 30 ℃, the stirring time can be properly reduced by 2-3 minutes; when the temperature is lower than 15 ℃ in winter, the stirring time is properly prolonged by 3 to 5 minutes. The prolonged time is based on the clarification and transparency of the resin after the stirring is finished. After the stirring is finished, the viscosity of the mixture is measured by a viscometer, and the mixture can be used when the viscosity of the mixture reaches 1000-1500mp · s. Through this operation, can be with each raw and other materials intensive mixing, stir more fully, form holistic resin paste.
(3) Preparation of a sheet:
selecting specific 2400tex SMC basalt fiber or glass fiber yarns to smooth yarn ends, enabling each yarn to penetrate through a bobbin from the lower part and be introduced into a cutter, and preparing to be cut; and leading out the upper and lower layers of films, penetrating the films to a winding device from a guide roller and fixing the films on a winding shaft.
And after the batching is finished, obtaining the resin paste, starting a paper rolling machine to test the machine, and after the test machine is correct, starting a discharge port to uniformly distribute the resin paste in the glue tank so that the resin paste amount in the glue tank is kept about one half. After the operation, the resin paste can be uniformly distributed on the surface of the lower film, so that the subsequent impregnation with the fiber chopped yarns is facilitated.
And opening the cutting machine to cut the fiber rough yarn and spread the fiber rough yarn on the lower film. The resin is uniformly coated on the upper and lower films by a doctor blade, and the upper and lower films, the resin paste and the fiber layer are laminated together by a guide roll to form a composite tape. And (5) dipping, defoaming and compacting the sheet, and then rolling. The method comprises the steps that paired rollers which are alternately arranged up and down exist on equipment, two adjacent rollers are staggered to alternately and annularly press the sheet, and extrusion kneading is repeatedly carried out, so that the effects of uniform mixing and full impregnation are achieved.
And during rolling, the composite film is ensured to completely wrap the fibers and the resin paste, and the interface and the two ends are sealed by the adhesive tape, so that the volatilization of styrene is reduced. After the operation, the upper film, the lower film, the fiber chopped yarn and the resin are overlapped to form a whole, the composite belt is alternately pressed circularly through the extrusion action of each extrusion gumming roller, and is repeatedly extruded and kneaded, so that the effects of improving the wettability and uniformly mixing the fiber chopped yarn can be achieved, and the volatilization of gas in the resin is also reduced. And rolling is to finish primary molding of the SMC sheet, and the product is in a roll shape.
(4) Curing treatment of the sheet:
the sheets are placed in a curing chamber regularly according to requirements, and meanwhile, the sealing performance of the curing chamber is noticed; in the process of curing the sheet, sealing and packaging the sheet by using an impermeable film to prevent styrene from volatilizing; checking the resin paste permeation condition at the edge of the sheet, and removing the sheet with more resin paste at the edge, wherein the sheet is generally removed to the position of 3cm of the edge of the sheet; the curing mode can be accelerated curing or natural curing, wherein the accelerated curing temperature is 35-40 ℃, the accelerated curing time is about 1-2 days, the natural curing temperature is generally 20-22 ℃, and the natural curing time is generally 7-14 days. After this operation, the primarily molded SMC sheet can be cured, and the viscosity of the sheet should be confirmed to be within the range of the molding viscosity after natural curing or accelerated curing is selected. And performing the die pressing production process after the requirements are met. After the operation, can make the sheet surface can not glue the hand for the fibrous layer that inside flows can flow to each region, guarantees that the shaping article is balanced, improves the pleasing to the eye degree of outward appearance, improves the stability of performance.
(5) And (3) die pressing production:
and (3) an operator receives the SMC sheet, checks the curing effect of the sheet when receiving the SMC sheet, starts the molding press after confirming that the sheet is correct, starts the oil temperature machine for heating, sets the heating temperature to be 150-155 ℃, and opens the mold. The insert and the insert are inspected and cleaned, and a preheating treatment is performed before the insert and the insert are placed into the die cavity. The mold release agent is uniformly applied, which may otherwise affect the surface quality and mold release effect of the molded antiglare panel. After the release agent is coated, the anti-dazzle plate is convenient to be separated from the mold, and the appearance effect is controlled. The SMC sheet is cut to be generally rectangular or circular, and is folded and placed according to the size of a forming area after being cut. When the temperature of the die rises to 145 +/-5 ℃, the sheet is fed, and the feeding position must ensure that the material can flow to each end part of the forming cavity of the die during forming. And closing the mold after the charging is finished, releasing pressure and deflating for 1-2 times for 3-20 s, wherein the pressure-releasing and deflating time is controlled after the material is melted. The pressure maintaining time of the SMC mould pressing material is controlled to be 1.5mm/min. And (3) after the production is finished, carrying out die sinking treatment, putting the anti-dazzle plate product into a cooling rack for cooling, wherein the cooling and shaping time is about 10min, and after the cooling is finished, carrying out edge grinding, drilling and other treatment on the surface. After the operation, the cured sheet is molded into the anti-dazzle plate of the molded part under a special mold, and the product finishes all the working procedures. Under the well-adapted temperature and time, the formed antiglare shield is neat in appearance and excellent in mechanical property.
Examples
The present disclosure is more particularly described in the following examples that are intended as illustrative only, since various modifications and changes within the scope of the present disclosure will be apparent to those skilled in the art. Unless otherwise indicated, all parts, percentages, and ratios reported in the following examples are on a weight basis, and all reagents used in the examples are commercially available or synthesized according to conventional methods and can be used directly without further treatment, and the equipment used in the examples is commercially available.
Example 1
The application provides an ultraviolet-resistant antiglare shield, which comprises an upper film layer, a lower film layer and an intermediate layer, wherein the intermediate layer comprises the following raw material components in parts by mass: 100 parts of unsaturated polyester resin, 120 parts of basalt fiber chopped yarn, 1 part of benzoyl peroxide, 1 part of hydroquinone, 10 parts of styrene, 150 parts of calcined kaolin, 3 parts of calcium hydroxide, 24 parts of low-shrinkage additive, 4 parts of zinc stearate, 0.4 part of anti-aging agent and 4 parts of ultraviolet-resistant additive. The upper film layer and the lower film layer are both PE films.
The preparation method of the ultraviolet-resistant anti-dazzle plate comprises the following steps:
(1) Selecting raw materials: selecting the raw materials of the middle layer according to the proportion.
(2) Mixing unsaturated polyester resin, styrene and low-shrinkage additive in a mixing barrel uniformly, and starting stirring at the speed of 200-300 r/min; adding an initiator and a polymerization inhibitor into a batching barrel, increasing the stirring speed to 500r/min, and stirring for 2-3 min to disperse the raw materials in the unsaturated polyester resin; then adding the release agent into a batching barrel in a slow-first and fast-second mode, and controlling the stirring time to be 3-5 min; adding a cross-linking agent, an anti-aging agent and an anti-ultraviolet additive into a dosing barrel, and stirring, wherein the stirring speed is adjusted to 600-700r/min, and the stirring time is 1 minute; and finally, adding the filler and the thickening agent into the mixture, and stirring for 5-8 minutes to obtain the resin paste. The viscosity of the resulting resin paste was measured to be 1200mp · s.
(3) Selecting SMC basalt fiber special for 2400tex to enable each yarn to penetrate through a bobbin from the lower part and be introduced into a cutter to prepare to be cut; and leading out the upper and lower layers of films, penetrating the films to a winding device from a guide roller and fixing the films on a winding shaft.
And opening a discharge port of the material rolling machine, and uniformly distributing the resin paste in the glue groove, so that the resin paste amount in the glue groove is kept about one half, the resin paste can be uniformly distributed on the surface of the lower film, and the subsequent impregnation with the fiber chopped yarns is facilitated.
And opening the cutting machine to cut the fiber rough yarn and spread the fiber rough yarn on the lower film. The resin is uniformly coated on the upper and lower films by a doctor blade, and the upper and lower films, the resin paste and the fiber layer are laminated together by a guide roll to form a composite tape. And (3) impregnating, defoaming and compacting the sheet, and then rolling to obtain the sheet.
(4) The sheet is cured at 35-40 deg.c for 1-2 days. The cured sheet was tested to have a viscosity of 2X 10 4 Pa.S。
(5) And carrying out mould pressing treatment on the cured sheet, and carrying out mould pressing treatment to obtain the ultraviolet-resistant anti-dazzle plate.
Example 2
The application provides an ultraviolet-resistant antiglare shield, which comprises an upper film layer, a lower film layer and an intermediate layer, wherein the intermediate layer comprises the following raw material components in parts by mass: 105 parts of unsaturated polyester resin, 130 parts of glass fiber chopped yarn, 1.2 parts of benzoyl peroxide, 0.5 part of hydroquinone, 8 parts of styrene, 140 parts of calcined kaolin, 2.5 parts of calcium hydroxide, 22 parts of low-shrinkage additive, 3 parts of zinc stearate, 0.5 part of anti-aging agent and 4 parts of ultraviolet-resistant additive. The upper film layer and the lower film layer are both PP films.
The preparation method is the same as that of example 1.
Example 3
The application provides an ultraviolet-resistant antiglare shield, which comprises an upper film layer, a lower film layer and an intermediate layer, wherein the intermediate layer comprises the following raw material components in parts by mass: 95 parts of unsaturated polyester resin, 120 parts of glass fiber chopped yarn, 1 part of benzoyl peroxide, 1 part of hydroquinone, 10 parts of styrene, 160 parts of calcined kaolin, 3 parts of calcium hydroxide, 20 parts of low-shrinkage additive, 4 parts of zinc stearate, 0.5 part of anti-aging agent and 3 parts of ultraviolet-resistant additive. The upper film layer and the lower film layer are both PE films.
The preparation method is the same as that of example 1.
Example 4
The application provides an ultraviolet-resistant antiglare shield, which comprises an upper film layer, a lower film layer and an intermediate layer, wherein the intermediate layer comprises the following raw material components in parts by mass: 100 parts of unsaturated polyester resin, 125 parts of glass fiber chopped yarn, 1.1 parts of benzoyl peroxide, 0.5 part of hydroquinone, 9 parts of styrene, 150 parts of calcined kaolin, 2.5 parts of calcium hydroxide, 22 parts of low-shrinkage additive, 3.5 parts of zinc stearate, 0.4 part of anti-aging agent and 2 parts of ultraviolet-resistant additive. The upper film layer and the lower film layer are both PP films.
The preparation method is the same as that of example 1.
Comparative example 1
This comparative example provides an ultraviolet ray resistant dazzle prevention plate, which is different from example 1 in that the ultraviolet ray resistant additive is not added, and the others are the same as example 1.
Comparative example 2
The comparative example provides an ultraviolet-resistant antiglare shield, which is different from example 2 in that the mass part of benzoyl peroxide is reduced to 0.5 part, and the rest is the same as example 2.
Comparative example 3
The comparative example provides an ultraviolet resistance antiglare shield, and is different from example 2 in that the curing process in the preparation method is to reduce the curing temperature to 20 ℃ at room temperature (the curing time is still 1 to 2 days), and the others are the same as example 1.
The ultraviolet ray resistant dazzle prevention plates of examples 1 to 4 and comparative examples 1 to 3 were tested for various performances, and the test results were as follows:
wind load test method (GB/T24718-2009): the bottom of the anti-dazzle plate is fixed on a test platform, the middle part of the plate is clamped by a standard clamp, the middle point of the standard clamp is used as a mechanical traction point, a rigid connection medium is firmly connected with a traction system of a mechanical test machine through a fixed pulley, the traction point and the lower edge of the fixed pulley are on the same straight line, the traction direction is perpendicular to the surface of the anti-dazzle plate, the anti-dazzle plate is pulled at the speed of 100mm/min under the condition that the connection medium is completely loosened until the surface of the plate is broken or the maximum load is reached, the test is stopped, and the maximum traction load is the wind load of the sample. 3 groups of tests are carried out in the above way, and the arithmetic mean value of the test results of 3 times is taken as a test result;
anti-deformation test method (GB/T24718-2009): the test equipment is arranged on the test platform together with the wind load, and the anti-dazzle plate is fixed on the test platform and is well connected with the test machine. Marking the projection S0 from the upper end of the anti-dazzle plate to the plane of the operating platform, starting a testing machine, carrying out traction at the speed of 15mm/min, stopping traction when the traction load reaches the wind-resistant load of a corresponding specification, unloading the applied load, enabling the anti-dazzle plate to recover from free elasticity, carrying out the projection from the upper end of the anti-dazzle plate to the plane of the operating platform after 5min, and marking as S1, wherein the deformation resistance R of the anti-dazzle plate can be expressed by the following formula: r = (S1-S0)/H
In the formula:
r-resistance to deformation in millimeters per meter (mm/m);
S1-Final projection Displacement in millimeters (mm);
s0-initial projection displacement in millimeters (mm);
ultraviolet resistance (GB 22040-2008): 20 samples were selected, 10 of which were used as test samples and 10 as reference samples, and stored in the dark. A UV-A340 type lamp tube is selected as a light source. The spectral irradiance of a sample frame at 340nm is (0.78 +/-0.02) W/(m 2 Nm), the test conditions were carried out according to exposure regime 1 as specified in 7.2 of GB/T16422.3-1997, irradiation exposure at black standard temperature (60 + -3) deg.C for 4h, followed by non-irradiation condensation exposure at black standard temperature (50 + -3) deg.C for 4h for 1 cycle.
TABLE 1 ultraviolet resistance antiglare shield performance index (test standard reference GB/T24718-2009)
From the test results in table 1, the results show that there is a difference between comparative example 1 and example 1 in that the appearance is color-shifted;
the difference between comparative example 2 and example 2 is that the wind load resistance is less than half that of example 1; the deformation resistance is higher, and the retention rate of mechanical properties is reduced by about 30 percent;
the difference between comparative example 3 and example 3 is. The wind load resistance is only about 60% of that of example 3, the deformation resistance is higher, and the retention rate of mechanical properties is reduced by about 20%.
While the present application has been described with reference to preferred embodiments, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the present application, and in particular, features shown in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.
Claims (10)
1. The ultraviolet-resistant antiglare shield is characterized by being of a multilayer structure and comprising a first film layer, an intermediate layer and a second film layer, wherein the intermediate layer comprises the following raw material components in parts by mass: 95-105 parts of unsaturated polyester resin, 120-130 parts of glass fiber or basalt fiber, 1-1.2 parts of initiator, 0.5-1 part of polymerization inhibitor, 8-10 parts of cross-linking agent, 140-160 parts of filler, 2.5-3 parts of thickener, 20-24 parts of low-shrinkage additive, 3-4 parts of internal mold release agent, 0.4-0.5 part of anti-aging agent and 2-4 parts of ultraviolet-resistant additive;
the first film layer and the second film layer comprise PE films or PP films.
2. The ultraviolet-resistant antiglare shield according to claim 1, wherein the intermediate layer comprises the following raw material components in parts by mass: 100 parts of unsaturated polyester resin, 120 parts of glass fiber or basalt fiber, 1 part of initiator, 1 part of polymerization inhibitor, 10 parts of cross-linking agent, 150 parts of filler, 3 parts of thickening agent, 24 parts of low-shrinkage additive, 4 parts of internal release agent, 0.4 part of anti-aging agent and 4 parts of ultraviolet resistant additive.
3. The ultraviolet-resistant antiglare panel of claim 1 or 2, wherein the unsaturated polyester resin has a solid content of 65 to 70%, a viscosity of 400 to 900mpa.s, and an acid value of 14 to 22mgKOH/g.
4. The ultraviolet-resistant dazzle prevention plate of claim 1 or 2, wherein the glass fiber or basalt fiber has a fiber diameter of 13 to 17 μm, a tensile strength of not less than 0.3N/tex, and a water content of not more than 0.1%.
5. The ultraviolet resistant glare shield according to claim 1 or 2, wherein the initiator comprises benzoyl peroxide, t-butyl peroxybenzoate, or cyclohexanone peroxide; and/or
The polymerization inhibitor comprises hydroquinone or hydroquinone; and/or
The crosslinking agent comprises styrene, vinyl toluene or methyl methacrylate; and/or
The filler comprises calcined kaolin, calcium carbonate or aluminum hydroxide; and/or
The thickener comprises calcium hydroxide, magnesium oxide or calcium oxide; and/or
The low-shrinkage additive comprises polyvinyl acetate, polyvinyl chloride or polyethylene; and/or
The internal release agent comprises zinc stearate or calcium stearate; and/or
The anti-aging agent comprises an anti-aging agent IPPD or an anti-aging agent 4010NA; and/or
The anti-ultraviolet additive comprises UV-770 or UV-531.
6. The preparation method of the ultraviolet-resistant antiglare shield is characterized by comprising the following steps of:
s1, uniformly mixing unsaturated polyester resin, an initiator, a polymerization inhibitor, a cross-linking agent, a filler, a thickening agent, a low-shrinkage additive, an internal release agent, an anti-aging agent and an anti-ultraviolet additive to obtain resin paste;
s2, uniformly coating the resin paste on the surface of the first film, soaking glass fibers or basalt fibers in the resin paste, and paving a second film on the surface of the resin paste soaked with the glass fibers or the basalt fibers to obtain a composite tape, wherein the first film and the second film comprise PE films or PP films;
s3, carrying out dipping, defoaming and compacting treatment on the composite belt to obtain a sheet;
and S4, curing and molding the sheet to obtain the ultraviolet-resistant anti-dazzle plate.
7. The method for producing an ultraviolet resistance dazzle prevention plate according to claim 6, wherein step S1 includes:
firstly, uniformly mixing unsaturated polyester resin, a cross-linking agent and a low-shrinkage additive to obtain a mixture A; adding an initiator and a polymerization inhibitor into the mixture A and uniformly stirring to obtain a mixture B; adding an internal release agent into the mixture B and uniformly stirring to obtain a mixture C; adding a cross-linking agent, an anti-aging agent and an anti-ultraviolet additive into the mixture C, and uniformly stirring to obtain a mixture D; and finally, adding the filler and the thickening agent into the mixture D, and uniformly stirring to obtain the resin paste.
8. The method for producing an ultraviolet ray resistant antiglare panel according to claim 7, wherein the viscosity of the resulting resin paste is 1000 to 1500mpa.s.
9. The method for producing an ultraviolet ray resistant dazzle prevention plate according to claim 6, wherein the curing treatment in step S4 includes curing at 35 to 40 ℃ for 1 to 2 days, or curing at 20 to 22 ℃ for 7 to 14 days.
10. The ultraviolet ray resistant dazzle prevention plate of claim 9The method is characterized in that the viscosity of the cured sheet is 2-6 x 10 4 Pa.S。
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