CN116875121B - High-transparency and impact-resistant PVC (polyvinyl chloride) coating for reflective film and manufacturing method thereof - Google Patents

High-transparency and impact-resistant PVC (polyvinyl chloride) coating for reflective film and manufacturing method thereof Download PDF

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CN116875121B
CN116875121B CN202310971740.9A CN202310971740A CN116875121B CN 116875121 B CN116875121 B CN 116875121B CN 202310971740 A CN202310971740 A CN 202310971740A CN 116875121 B CN116875121 B CN 116875121B
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pvc
parts
coating
impact
transparency
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CN116875121A (en
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郑小平
王圣贤
刘玫
胡锋
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Zhejiang Longyou Daoming Optics & Chemical Co ltd
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Zhejiang Longyou Daoming Optics & Chemical Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
    • C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
    • C09D127/04—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
    • C09D127/06—Homopolymers or copolymers of vinyl chloride
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/20—Diluents or solvents
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/65—Additives macromolecular
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/10—Transparent films; Clear coatings; Transparent materials
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Laminated Bodies (AREA)

Abstract

The application discloses a high-transparency and impact-resistant PVC coating for a reflective film, which comprises a PVC mixture and a tetrahydrofuran solvent, wherein the PVC mixture comprises the following components in parts by weight: 70-90 parts of first PVC resin; 10-30 parts of a second PVC resin; 8-15 parts of high molecular plasticizer; 10-30 parts of EVA elastomer; 1-5 parts of acrylic acid copolymer; 0.5-3 parts of stabilizer; 0.3 to 1.5 portions of antioxidant; 1-6 parts of ultraviolet absorber UVA; 0.2 to 1 part of light stabilizer HALS; wherein the K value of the first PVC resin is 75-83, and the K value of the second PVC resin is 58-66. The PVC coating has excellent transparency and meets the requirement of the surface layer of the reflective film on high light transmittance; the use amount of the plasticizer is reduced, and the impact resistance of the PVC coating is obviously improved due to the high elasticity of the EVA resin; the PVC mixture has proper viscosity and can be coated by a 'blade coating process' or an 'extrusion process', so that the finally prepared PVC coating has more excellent shrinkage resistance.

Description

High-transparency and impact-resistant PVC (polyvinyl chloride) coating for reflective film and manufacturing method thereof
Technical Field
The application relates to the field of reflective films, in particular to a high-transparency and impact-resistant PVC coating for a reflective film and a manufacturing method thereof.
Background
The reflective film is a multilayer composite film with retroreflective performance, which is generally formed by taking a high-molecular polymer as a surface layer, embedding high-refractive-index glass beads into acrylic resin as a bead implantation layer, and further comprises a focus focusing layer, a metal reflective layer and a pressure-sensitive adhesive layer. In some applications, the reflective film and the metal aluminum plate can be laminated and then subjected to surface printing and stamping, so that the motor vehicle license plate with concave-convex characters is obtained.
Because the motor vehicle license plate needs to be used outdoors for a long time, the high-molecular polymer used as the surface layer of the reflecting film needs to have excellent weather resistance due to the irradiation of ultraviolet rays in sunlight, and the natural exposure aging and the artificial accelerated aging test of no less than 1200 hours are required to be achieved in some standard regulations;
Because the light-reflecting film is used as a surface layer of the light-reflecting film, the surface layer material needs to have high transparency to reduce the absorption and refraction of the surface layer material to light energy, so that the whole product has better retroreflection performance;
Of course, in order to cope with the problem that the service life of the reflective film is affected due to damage of the reflective film surface caused by impact of hard objects such as small stones in the high-speed running process of the motor vehicle, the surface coating is required to have a certain impact resistance.
Based on the above problems and in combination with the use scene of the motor vehicle license plate reflective film, a PVC coating with high transparency and high weather resistance and certain impact resistance is required to be developed so as to meet the application of the PVC coating on the motor vehicle license plate reflective film.
Disclosure of Invention
In order to solve the technical problems, the application provides a high-transparency and impact-resistant PVC coating for a reflective film, which comprises a PVC mixture and a tetrahydrofuran solvent, wherein the PVC mixture comprises the following components in parts by weight:
Wherein the K value of the first PVC resin is 75-83, and the K value of the second PVC resin is 58-66.
According to the application, two PVC resins and other components are dissolved in tetrahydrofuran solvent (namely THF solvent) to form a liquid slurry, and the viscosity of the liquid slurry meets the coating process requirements of a knife coating process or an extrusion process, so that the prepared PVC coating has excellent anti-shrinkage performance.
The PVC coating with excellent weather resistance, impact resistance, scratch resistance and high transparency can be obtained by adopting the combination of the PVC resin, the ultraviolet absorbent UVA, the high molecular plasticizer, the EVA elastomer and the acrylic copolymer.
In the prior art, a high-k PVC resin is generally adopted, and the molecular chain length of the PVC resin can obtain excellent impact resistance, scratch resistance and heat resistance, but the viscosity of the prepared slurry is higher, so that the PVC resin is unfavorable for production and manufacture by a blade coating or extrusion process, and the manufacturability is poor.
In order to improve the defect of poor manufacturability of the high-K PVC resin and still maintain excellent scratch resistance and impact resistance, the application adopts the combination and collocation of two PVC resins with different K values, namely the high-K value and the low-K value, so that the viscosity of the prepared slurry is improved, the change of the viscosity of the slurry is smaller with time in the production and manufacturing process, the storage stability is more excellent, the deaeration property of the prepared slurry is good, the influence on the appearance in the production and manufacturing process is reduced, the surface of the coating is smoother and finer after the slurry is subjected to stepped drying and baking, and the defect problems of particle points, bubble points and the like are avoided.
In addition, the stabilizer is introduced, so that the processing stability of the PVC mixture in the high-temperature baking processing process can be improved.
Preferably, the polymer plasticizer is a polyadipate plasticizer having a molecular weight of 2000 to 3000.
The poly (adipate) plasticizer has better compatibility to PVC resin and other auxiliary agents in the mixture, is favorable for obtaining transparent PVC mixture, has better migration resistance due to larger molecular weight, and meets the problem of easy migration of the plasticizer after long-time outdoor use.
Preferably, the melt index MI of the EVA elastomer is 35, and the Shore hardness is less than or equal to 80A.
EVA elastomer possesses more excellent flexibility and elasticity, still possesses excellent impact resistance under the low temperature condition, and its compatibility is good with PVC resin simultaneously, makes the coating surface glossiness stronger when satisfying high transparency.
Preferably, the acrylic copolymer is an ACR impact modifier, consisting of MMA/BMA, having a weight average molecular weight of 50 to 200 tens of thousands.
The introduction of the high molecular weight ACR impact modifier can lead the impact resistance of the whole coating to be more excellent, and meanwhile, the acrylic impact modifier consisting of MMA/BMA has no easy-aging structures such as benzene rings and the like, and has more excellent outdoor weather resistance.
Preferably, the stabilizer is one or more of barium zinc, calcium zinc and organic tin stabilizers.
One or more of barium zinc, calcium zinc and organic tin stabilizers are selected, so that the processing stability of the PVC mixture in the high-temperature baking processing process can be met, and the problem that the PVC is degraded and the product quality is affected due to HCL (hydrogen chloride) generated by combining CL ions and H ions in a PVC molecular chain caused by high temperature is reduced.
Preferably, the antioxidant is one or more of hindered phenols, phosphites and sulfur antioxidants.
Preferably, the ultraviolet absorber UVA is one or more of benzophenone, benzotriazole and triazine.
Preferably, the light stabilizer HALS is a high molecular weight hindered amine light stabilizer.
The ultraviolet absorber UVA is added to the PVC mixture to be matched with the light stabilizer HALS, so that the PVC coating has excellent weather resistance and meets the requirement of long-time outdoor use.
The application also provides a manufacturing method of the high-transparency and impact-resistant PVC coating for the reflective film, which comprises the following steps:
S100: the PVC mixture and tetrahydrofuran solvent are mixed according to the ratio of 1:3-1: 3.5 parts by weight of a pre-mixed material;
S200: placing the premixed material into a closed stirrer for stirring;
S300: filtering the premixed material stirred in the step S200 to obtain slurry;
s400: coating the slurry into a flat wet film through a blade coating process or an extrusion process;
s500: and carrying out step drying on the wet film to obtain the PVC coating.
Preferably, in the stirring process of the step S200, the mixture is heated to 60-70 ℃, the stirring speed is 100-1500 rpm/min, and the stirring time is 3-4 h.
Preferably, in the step 300, a filter element with a specification of 5 μm is used for filtering.
Preferably, the viscosity of the slurry is 500 to 3000mpa·s.
Preferably, in the step 400, the blade coating process uses a comma doctor blade for coating.
Preferably, in the step 500, the wet film is placed in a stepped drying oven at 50 ℃ to 140 ℃ and dried for 3 to 6 minutes.
In the prior art, a part of PVC coating adopts a calendaring process, and the calendaring process has the defect that after heated PVC resin is extruded and cooled, a molecular chain segment can be stretched for the second time, so that the final contractibility of the PVC resin after drying and film forming can be deteriorated. In order to obtain a PVC coating having excellent shrink resistance, the slurry of the present application is coated using a blade coating process or an extrusion process, without using a calendaring process.
Compared with the prior art, the application has at least one of the following technical effects:
1. The compatibility of different resins in the PVC mixture is good, so that the PVC coating has excellent transparency, and the requirement of the surface layer of the reflective film on high light transmittance is met;
2. According to the PVC mixture, the EVA elastomer resin and the acrylic acid copolymer are added as the toughening agent, so that the use amount of the plasticizer is obviously reduced, and the impact resistance of the PVC coating is obviously improved due to the high elasticity of the EVA elastomer;
3. The PVC mixture of the application dissolves two PVC resins and other components in tetrahydrofuran solvent (namely THF solvent) to form a liquid slurry, and the viscosity of the liquid slurry is proper, so that the liquid slurry can be coated by a knife coating process or an extrusion process in the follow-up process, and the PVC mixture is not required to be produced by a rolling process, namely, the PVC mixture is not required to be extruded and stretched by double rollers or multiple rollers in the traditional rolling process, so that the finally prepared PVC coating has more excellent shrinkage resistance and completely meets the use requirement of a reflective film.
Detailed Description
The technical scheme of the application is further described below with reference to the specific embodiments, but the application is not limited thereto.
Example 1
The high-transparency and impact-resistant PVC coating for the reflective film comprises a PVC mixture and a tetrahydrofuran solvent, wherein the PVC mixture comprises the following components in parts by weight:
Wherein the K value of the first PVC resin is 75-83, and the K value of the second PVC resin is 58-66.
Preferably, the polymer plasticizer is a polyadipate plasticizer having a molecular weight of 2000 to 3000.
Preferably, the melt index MI of the EVA elastomer is 35, and the Shore hardness is less than or equal to 80A.
Preferably, the acrylic copolymer is an ACR impact modifier, consisting of MMA/BMA, having a weight average molecular weight of 50 to 200 tens of thousands.
Preferably, the stabilizer is one or more of barium zinc, calcium zinc and organic tin stabilizers.
Preferably, the antioxidant is one or more of hindered phenols, phosphites and sulfur antioxidants.
Preferably, the ultraviolet absorber UVA is one or more of benzophenone, benzotriazole and triazine.
Preferably, the light stabilizer HALS is a high molecular weight hindered amine light stabilizer.
The manufacturing method of the PVC coating comprises the following steps:
s100: premixing the PVC mixture and tetrahydrofuran solvent according to the weight ratio of 1:3 to form a premixed material;
S200: stirring the premixed material in a closed stirrer, heating to 60 ℃, wherein the stirring speed is 100rpm/min, and the stirring time is 3 hours, so that the PVC mixture is completely dissolved;
s300: filtering the premixed material stirred in the step S200 by adopting a filter element with the specification of 5 micrometers to obtain slurry with the viscosity of 2500 mPa.s;
s400: coating the slurry into a flat wet film through a blade coating process or an extrusion process;
S500: and (3) carrying out step drying on the wet film, placing the wet film in a step drying oven with the temperature of 50-140 ℃ for 6 minutes, and obtaining the PVC coating with the thickness of 60 microns after the drying is finished.
Example 2
The high-transparency and impact-resistant PVC coating for the reflective film comprises a PVC mixture and a tetrahydrofuran solvent, wherein the PVC mixture comprises the following components in parts by weight:
Wherein the K value of the first PVC resin is 75-83, and the K value of the second PVC resin is 58-66.
Preferably, the polymer plasticizer is a polyadipate plasticizer having a molecular weight of 2000 to 3000.
Preferably, the melt index MI of the EVA elastomer is 35, and the Shore hardness is less than or equal to 80A.
Preferably, the acrylic copolymer is an ACR impact modifier, consisting of MMA/BMA, having a weight average molecular weight of 50 to 200 tens of thousands.
Preferably, the stabilizer is one or more of barium zinc, calcium zinc and organic tin stabilizers.
Preferably, the antioxidant is one or more of hindered phenols, phosphites and sulfur antioxidants.
Preferably, the ultraviolet absorber UVA is one or more of benzophenone, benzotriazole and triazine.
Preferably, the light stabilizer HALS is a high molecular weight hindered amine light stabilizer.
The manufacturing method of the PVC coating comprises the following steps:
S100: the PVC mixture and tetrahydrofuran solvent were mixed according to 1:3.5 parts by weight of a pre-mixed material;
S200: stirring the premixed material in a closed stirrer, heating to 70 ℃, wherein the stirring speed is 1500rpm/min, and the stirring time is 4 hours, so that the PVC mixture is completely dissolved;
s300: filtering the premixed material stirred in the step S200 by adopting a filter element with the specification of 5 micrometers to obtain slurry with the viscosity of 1800 mPa.s;
s400: coating the slurry into a flat wet film through a blade coating process or an extrusion process;
s500: and (3) carrying out step drying on the wet film, placing the wet film in a step drying oven with the temperature of 50-140 ℃ for 5 minutes, and obtaining the 60-micrometer thick PVC coating after drying.
Example 3
The high-transparency and impact-resistant PVC coating for the reflective film comprises a PVC mixture and a tetrahydrofuran solvent, wherein the PVC mixture comprises the following components in parts by weight:
Wherein the K value of the first PVC resin is 75-83, and the K value of the second PVC resin is 58-66.
Preferably, the polymer plasticizer is a polyadipate plasticizer having a molecular weight of 2000 to 3000.
Preferably, the melt index MI of the EVA elastomer is 35, and the Shore hardness is less than or equal to 80A.
Preferably, the acrylic copolymer is an ACR impact modifier, consisting of MMA/BMA, having a weight average molecular weight of 50 to 200 tens of thousands.
Preferably, the stabilizer is one or more of barium zinc, calcium zinc and organic tin stabilizers.
Preferably, the antioxidant is one or more of hindered phenols, phosphites and sulfur antioxidants.
Preferably, the ultraviolet absorber UVA is one or more of benzophenone, benzotriazole and triazine.
Preferably, the light stabilizer HALS is a high molecular weight hindered amine light stabilizer.
The manufacturing method of the PVC coating comprises the following steps:
s100: the PVC mixture and tetrahydrofuran solvent were mixed according to 1:3.2 parts by weight of a pre-mixed material;
S200: stirring the premixed material in a closed stirrer, heating to 65 ℃, wherein the stirring speed is 800rpm/min, and the stirring time is 3.5h, so that the PVC mixture is completely dissolved;
S300: filtering the premixed material stirred in the step S200 by adopting a filter element with the specification of 5 micrometers to obtain slurry with the viscosity of 500 mPa.s;
s400: coating the slurry into a flat wet film through a blade coating process or an extrusion process;
S500: and (3) carrying out step drying on the wet film, placing the wet film in a step drying oven with the temperature of 50-140 ℃, and drying for 3 minutes to obtain the 60-micrometer thick PVC coating after the drying is finished.
Example 4
The high-transparency and impact-resistant PVC coating for the reflective film comprises a PVC mixture and a tetrahydrofuran solvent, wherein the PVC mixture comprises the following components in parts by weight:
Wherein the K value of the first PVC resin is 75-83, and the K value of the second PVC resin is 58-66.
Preferably, the polymer plasticizer is a polyadipate plasticizer having a molecular weight of 2000 to 3000.
Preferably, the melt index MI of the EVA elastomer is 35, and the Shore hardness is less than or equal to 80A.
Preferably, the acrylic copolymer is an ACR impact modifier, consisting of MMA/BMA, having a weight average molecular weight of 50 to 200 tens of thousands.
Preferably, the stabilizer is one or more of barium zinc, calcium zinc and organic tin stabilizers.
Preferably, the antioxidant is one or more of hindered phenols, phosphites and sulfur antioxidants.
Preferably, the ultraviolet absorber UVA is one or more of benzophenone, benzotriazole and triazine.
Preferably, the light stabilizer HALS is a high molecular weight hindered amine light stabilizer.
The manufacturing method of the PVC coating comprises the following steps:
s100: premixing the PVC mixture and tetrahydrofuran solvent according to the weight ratio of 1:3 to form a premixed material;
s200: stirring the premixed material in a closed stirrer, heating to 70 ℃, wherein the stirring speed is 800rpm/min, and the stirring time is 4 hours, so that the PVC mixture is completely dissolved;
s300: filtering the premixed material stirred in the step S200 by adopting a filter element with the specification of 5 micrometers to obtain slurry with the viscosity of 1000 mPa.s;
s400: coating the slurry into a flat wet film through a blade coating process or an extrusion process;
S500: and (3) carrying out step drying on the wet film, placing the wet film in a step drying oven with the temperature of 50-140 ℃, and drying for 3 minutes to obtain the 60-micrometer thick PVC coating after the drying is finished.
Example 5
The high-transparency and impact-resistant PVC coating for the reflective film comprises a PVC mixture and a tetrahydrofuran solvent, wherein the PVC mixture comprises the following components in parts by weight:
Wherein the K value of the first PVC resin is 75-83, and the K value of the second PVC resin is 58-66.
Preferably, the polymer plasticizer is a polyadipate plasticizer having a molecular weight of 2000 to 3000.
Preferably, the melt index MI of the EVA elastomer is 35, and the Shore hardness is less than or equal to 80A.
Preferably, the acrylic copolymer is an ACR impact modifier, consisting of MMA/BMA, having a weight average molecular weight of 50 to 200 tens of thousands.
Preferably, the stabilizer is one or more of barium zinc, calcium zinc and organic tin stabilizers.
Preferably, the antioxidant is one or more of hindered phenols, phosphites and sulfur antioxidants.
Preferably, the ultraviolet absorber UVA is one or more of benzophenone, benzotriazole and triazine.
Preferably, the light stabilizer HALS is a high molecular weight hindered amine light stabilizer.
The manufacturing method of the PVC coating comprises the following steps:
s100: premixing the PVC mixture and tetrahydrofuran solvent according to the weight ratio of 1:3 to form a premixed material;
S200: stirring the premixed material in a closed stirrer, heating to 60 ℃, wherein the stirring speed is 100rpm/min, and the stirring time is 3 hours, so that the PVC mixture is completely dissolved;
S300: filtering the premixed material stirred in the step S200 by adopting a filter element with the specification of 5 micrometers to obtain slurry with the viscosity of 3000 mPa.s;
s400: coating the slurry into a flat wet film through a blade coating process or an extrusion process;
S500: and (3) carrying out step drying on the wet film, placing the wet film in a step drying oven with the temperature of 50-140 ℃ for 6 minutes, and obtaining the PVC coating with the thickness of 60 microns after the drying is finished.
Example 6
The PVC coatings prepared in examples 1 to 3 were subjected to performance tests including transparency and impact, shrinkage and weather resistance, and the specific test methods were as follows:
(1) Transparency (light transmittance) test:
test device: a light transmittance tester;
the transmittance calculation formula is tt=t2/t1×100%, wherein the incident light flux (T1) and the transmitted light flux (T2).
(2) Impact resistance test:
The prepared sample is placed in an environment of-20+/-3 ℃ for 1h, and the impact test is carried out within 5min after the sample is taken out. In the impact test, the sample is placed upwards on a steel plate with the thickness of 20mm, a solid steel ball with the diameter of 25mm is used for freely falling to impact the coated surface for 1 time at the position 2m above the sample, and the falling point is as far as possible at the center of the sample. After the test, the surface of the sample is beyond a circular area with the impact point as the center and the radius of 5mm, and cracks, blushing or other damages are not generated.
Evaluation grade: very good, delta, pass, and fail.
(3) Shrink resistance test:
Test device: thermal shrinkage instrument (recommended general technology RSY-R2);
Liquid heat transfer medium: glycerol;
a frame: two frames embedded with metal mesh are slightly larger in size than the test pieces. The distance between the two metal nets is 1-3 mm, and the free shrinkage of the sample is not affected.
Sample: a steel ruler, a blade or a tool with the precision of 0.5mm is used for cutting out 3 samples with the precision of 100mmX and 100mm, and the longitudinal direction and the transverse direction of the film are marked.
The test steps are as follows: and (3) placing the sample between two frames, quickly immersing the sample in a medium of a constant-temperature bath at the temperature of 140+/-2 ℃ and starting timing, keeping the sample uniformly heated and freely contracted in the test process, taking out the sample after 20S, immersing the sample in the medium of the constant-temperature bath for cooling, cooling for 5S, taking out, horizontally standing for 10min, and respectively measuring the longitudinal and transverse dimensional contraction ratios of the sample.
(4) Weather resistance test:
And cutting a 120mm multiplied by 50mm sample, pasting the sample on a bottom plate to prepare a sample, and then placing the sample into an aging test box. The test is carried out according to the method of GB/T16422.2, a xenon arc lamp is adopted as a light source in an aging test box, the temperature of a blackboard in the box is 65+/-3 ℃, and the relative humidity is 50+/-5%; irradiance between the spectrum wavelength of 290nm and 800nm is 550W/m 2±50W/m2, total irradiance between the spectrum wavelength of 290nm and 2450nm is not more than 1000W/m 2±100W/m2, and irradiance difference between any two points on the surface of the sample is not more than 10%; the test process adopts continuous illumination and periodically sprays water, and the water spraying period is 18min/102min (water spraying time/non-water spraying time). After the test is finished, the test specimen is thoroughly washed by clean water and then wiped by clean soft cloth, and the yellowing condition of the test specimen is checked.
The results of the test are shown in Table 1, with a 60 μm thick transparent PVC film produced by a commercial calendering process as a comparative example.
TABLE 1
Modifications and variations of the above embodiments will be apparent to those skilled in the art in light of the above teachings. Therefore, the application is not limited to the specific embodiments disclosed and described above, but some modifications and changes of the application should be also included in the scope of the claims of the application. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not limit the present application in any way.

Claims (8)

1. The high-transparency and impact-resistant PVC coating for the reflective film is characterized by comprising a PVC mixture and a tetrahydrofuran solvent, wherein the PVC mixture comprises the following components in parts by weight:
70-90 parts of a first PVC resin;
10-30 parts of a second PVC resin;
8-15 parts of a high polymer plasticizer;
10-30 parts of EVA elastomer;
1-5 parts of an acrylic copolymer;
0.5-3 parts of stabilizer;
0.3-1.5 parts of an antioxidant;
1-6 parts of an ultraviolet absorber UVA;
0.2-1 parts of light stabilizer HALS;
Wherein the K value of the first PVC resin is 75-83, and the K value of the second PVC resin is 58-66;
The molecular weight of the high molecular plasticizer is 2000-3000;
the acrylic copolymer is an ACR impact modifier;
The manufacturing method of the high-transparency and impact-resistant PVC coating for the reflective film comprises the following steps:
S100: the PVC mixture and tetrahydrofuran solvent are mixed according to the ratio of 1:3-1: 3.5 parts by weight of a pre-mixed material;
S200: placing the premixed material into a closed stirrer for stirring;
S300: filtering the premixed material stirred in the step S200 to obtain slurry, wherein the viscosity of the slurry is 500-3000 mPa.s;
S400: coating the slurry into a flat wet film through a blade coating process;
s500: and carrying out step drying on the wet film to obtain the PVC coating.
2. A highly transparent, impact resistant PVC coating for retroreflective sheeting according to claim 1, wherein the polymeric plasticizer is a polyadipate plasticizer.
3. The high transparency, impact resistant PVC coating for retroreflective sheeting of claim 1 wherein the EVA elastomer has a melt index MI of 35 and a Shore hardness of 80A or less.
4. The highly transparent, impact-resistant PVC coating for retroreflective sheeting according to claim 1, wherein the ACR impact modifier is comprised of MMA/BMA and has a weight average molecular weight of 50 to 200 tens of thousands.
5. The high-transparency impact-resistant PVC coating for reflective film according to claim 1, wherein the stabilizer is one or more of barium zinc, calcium zinc, and organotin stabilizers.
6. The high transparency, impact resistant PVC coating for retroreflective sheeting of claim 1 wherein the antioxidant is one or more of hindered phenols, phosphites and thio antioxidants.
7. The highly transparent, impact resistant PVC coating for retroreflective sheeting of claim 1 wherein the uv absorber UVA is one or more of benzophenones, benzotriazoles, triazines.
8. A highly transparent, impact resistant PVC coating for retroreflective sheeting according to claim 1, wherein the light stabilizer HALS is a high molecular weight hindered amine light stabilizer.
CN202310971740.9A 2023-08-03 2023-08-03 High-transparency and impact-resistant PVC (polyvinyl chloride) coating for reflective film and manufacturing method thereof Active CN116875121B (en)

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DE102004023658A1 (en) * 2004-04-30 2005-11-24 Faurecia Innenraum Systeme Gmbh Polymer coating composition containing suspension-PVC, plasticiser, thermal stabiliser and solvent, used for the production and repair of elastomer skin on interior lining parts of motor vehicles
CN102964719A (en) * 2012-11-19 2013-03-13 南京工业大学 Ultraviolet light resistant transparent polyvinyl chloride elastic calendered film and preparation method thereof
CN109705493A (en) * 2018-12-28 2019-05-03 安徽嘉阳新材料科技有限公司 High intensity printing basement membrane and preparation method thereof
CN112159568A (en) * 2020-09-21 2021-01-01 百通赫思曼工业（苏州）有限公司 Formula of-40 ℃ low-temperature impact flame-retardant PVC elastomer cable material and preparation method thereof
CN113736190A (en) * 2021-08-23 2021-12-03 江苏图研新材料科技有限公司 Casting-grade PVC color-changing film and preparation method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004023658A1 (en) * 2004-04-30 2005-11-24 Faurecia Innenraum Systeme Gmbh Polymer coating composition containing suspension-PVC, plasticiser, thermal stabiliser and solvent, used for the production and repair of elastomer skin on interior lining parts of motor vehicles
CN102964719A (en) * 2012-11-19 2013-03-13 南京工业大学 Ultraviolet light resistant transparent polyvinyl chloride elastic calendered film and preparation method thereof
CN109705493A (en) * 2018-12-28 2019-05-03 安徽嘉阳新材料科技有限公司 High intensity printing basement membrane and preparation method thereof
CN112159568A (en) * 2020-09-21 2021-01-01 百通赫思曼工业（苏州）有限公司 Formula of-40 ℃ low-temperature impact flame-retardant PVC elastomer cable material and preparation method thereof
CN113736190A (en) * 2021-08-23 2021-12-03 江苏图研新材料科技有限公司 Casting-grade PVC color-changing film and preparation method thereof

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