CN111423674A - PVC film and processing technology thereof - Google Patents
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Abstract
The invention relates to the field of plastic film manufacturing, aims to provide a PVC film and a processing technology thereof, aims to solve the problem of low recycling rate of waste PVC plastics in the PVC film processing process, and has the technical scheme that: the PVC composite material comprises 45-65 parts of PVC recycled granules, 60-90 parts of PVC resin powder, 20-28 parts of composite plasticizer, 0.8-1.2 parts of lubricant, 3-8 parts of heat stabilizer, 2-3 parts of nano titanium dioxide and 2-3 parts of nano silicon dioxide, wherein the composite plasticizer comprises a solid plasticizer, DOP and DINP in a mass ratio of (1.5-3) to 1:1, and the heat stabilizer comprises dioctyl tin dilaurate and epoxidized soybean oil in a mass ratio of 2: 1; the method comprises the following processing steps: s1, recovering PVC granules; s2, screening and removing impurities; s3, stirring and mixing; s4, banburying; s5, open mixing; s6, filtering; and S7, rolling and forming. According to the invention, the utilization rate of the waste PVC recycled granules is improved, and the prepared PVC film has the advantages of good transparency, uniform texture, good aging resistance and good antibacterial property.
Description
Technical Field
The invention belongs to the technical field of plastic film manufacturing, and particularly relates to a PVC film and a processing technology thereof.
Background
PVC is one of five general synthetic resins in synthetic materials, the yield of the PVC is second to that of polyethylene, and the PVC is widely applied to the building industry, packaging materials, household daily necessities and automobile industry, however, the PVC material is difficult to degrade, and a large amount of accumulation can cause environmental pollution, thereby not only affecting the lives of surrounding residents, but also negatively affecting the urban aesthetics. Therefore, the recycling of the waste PVC plastic is not slow, the waste plastic is changed into valuable, the problem of environmental pollution is relieved, and considerable economic benefit can be created.
Chinese patent with application publication number CN103102618A discloses a TiO2@ Ag/PVC composite antibacterial film and a preparation method thereof, and the film is mainly prepared by uniformly mixing modified TiO2@ Ag nano fibers, PVC resin, a plasticizer, a lubricant and a composite stabilizer in a mass ratio of 0.5-5: 55-65: 30-40: 0.1-0.5: 0.5-3 in a high-speed mixer and then blowing the mixture into a film, wherein the modified TiO2@ Ag nano fibers are prepared by dissolving 0.4-0.6 g of TiO2@ Ag composite nano fibers in 100m of a toluene solution of gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane with L concentration of 0.05-0.15 mol/L and refluxing for 30 minutes, the modified TiO2@ Ag has a structure that nano silver particles are uniformly attached to the surface of TiO2 nano fibers, the diameter of the TiO2 fibers is 40-70 nm, and the particle size of the nano silver particles is 3-20 nm.
Although the antibacterial performance of the film is improved by adding the silver ion antibacterial agent in the prior art scheme, the waste PVC plastic cannot be effectively utilized during preparation, and the recycling rate of the waste PVC plastic is improved. Therefore, further improvement in recycling of waste PVC raw material is required.
Disclosure of Invention
The first purpose of the invention is to provide a PVC film, which can effectively recycle PVC reclaimed materials and save raw materials, and the prepared PVC film has the advantages of good transparency, uniform texture, good aging resistance and good antibacterial property.
The technical purpose of the invention is realized by the following technical scheme:
a PVC film comprises 45-65 parts of PVC recycled granules, 60-90 parts of PVC resin powder, 20-28 parts of a composite plasticizer, 0.8-1.2 parts of a lubricant and 3-8 parts of a heat stabilizer, wherein the composite plasticizer comprises a solid plasticizer, DOP and DINP in a mass ratio of (1.5-3) to 1: 1.
By adopting the technical scheme, the PVC recycled granules replace part of PVC resin powder, so that the utilization rate of raw materials is effectively improved, the cost of the raw materials is reduced, and the composite plasticizer is added into the formula, wherein DOP is a universal plasticizer, so that the mixing property is good, the plasticizing efficiency is high, the volatility is low, the water extraction resistance is high, and the heat resistance and the weather resistance are good; DINP has good intermiscibility with PVC, is not easy to separate out, has larger molecular weight and longer carbon chain compared with DOP, has better ageing resistance and migration resistance, but has slightly poorer plasticizing effect than DOP; the solid plasticizer has a specific pore structure and has adsorption performance on smaller plasticizers of DOP and DINP, so that the small-molecule plasticizer is fixed, small-molecule compounds are prevented from being migrated and separated out, and the PVC resin is effectively plasticized and the separation effect of plasticizer molecules is reduced as far as possible through the mutual compounding and cooperation of the solid plasticizer, DOP and DINP. The composite plasticizer has good compatibility with PVC, can reduce the brittleness of PVC resin and improve the toughness of the PVC resin; the lubricant can improve the fluidity of the PVC resin in the processing process, improve the adhesion of the resin and processing equipment, reduce resin retention, and contribute to improving the film-forming property and film gloss of the PVC; the heat-resistant aging resistance of the PVC resin can be improved by adding the heat stabilizer, and the service life of the material is prolonged;
further, the solid plasticizer is poly propylene glycol adipate.
By adopting the technical scheme, the poly (propylene glycol adipate) is a solid plasticizer with low molecular weight, volatility and mobility, belongs to a polyester plasticizer, has excellent oil resistance and water extraction resistance, is a good heat resistance and durability plasticizer, and can form an effective compound synergistic effect with DOP and DINP.
Further, the heat stabilizer comprises dioctyl tin dilaurate and epoxidized soybean oil in a mass ratio of 2: 1.
By adopting the technical scheme, the dioctyltin dilaurate is a nontoxic organic tin heat stabilizer, has good lubricity, weather resistance and compatibility, and has no sulfuration pollution and exudation pollution; the epoxidized soybean oil is a PVC nontoxic stabilizer widely applied, has good thermal stability and light stability, has good plasticizing effect, good intermiscibility with PVC, low volatilization and low migration.
Further, the lubricant is one or more of stearate, glyceryl stearate and fatty acid amide type lubricant.
By adopting the technical scheme, the stearate, the glyceryl stearate and the fatty acid amide lubricant not only have excellent lubricating performance, but also have better thermal stability, and are beneficial to improving the processability of the PVC resin.
Furthermore, the product also comprises 2-3 parts of nano titanium dioxide and 2-3 parts of nano silicon dioxide.
By adopting the technical scheme, the nano titanium dioxide and the nano silicon dioxide have good dispersibility and weather resistance, have excellent ultraviolet ray shielding property, and can increase the ultraviolet ray aging resistance of the PVC film, thereby achieving the effect of prolonging the practical service life of the PVC film.
Further, the nano titanium dioxide is rutile type titanium dioxide with the particle size range of 20-40 nm.
By adopting the technical scheme, the rutile type titanium dioxide has higher hardness, and the nanometer titanium dioxide molecules can enter a specific pore structure of the solid plasticizer, so that the bonding fastness of the titanium dioxide and a mixed system is improved, and the effect of improving the ultraviolet aging resistance durability of the PVC resin is achieved.
Further, the nano-silica is fumed silica with a particle size range of 10-20 nm.
Through adopting above-mentioned technical scheme, fumed silica has porous structure, and inside has a lot of nanometer gas pockets to can form the gas pocket wall that is similar to "infinity", each gas pocket wall all can produce the effect of heat shield, can play the effect that reduces heat radiation, has increased the thermal-insulated effect of PVC film.
Furthermore, the product also comprises 0.2-0.3 part of an antibacterial agent, wherein the antibacterial agent is an organosilicon quaternary ammonium salt antibacterial agent.
By adopting the technical scheme, the organic silicon quaternary ammonium salt is an antibacterial agent with ideal comprehensive performance, the antibacterial agent does not need to be baked at high temperature, can generate a lasting antibacterial effect after being dried generally, and can not only obviously improve the antibacterial performance of the PVC film, but also increase the flexibility, the antistatic property and the anti-pollution property of the PVC film after being added into the PVC resin.
The second purpose of the invention is to provide the processing technology for producing the PVC film, the processing technology has good processing stability, can effectively recycle the old PVC material, and reduces the production cost.
The second technical purpose of the invention is realized by the following technical scheme:
a processing technology of a PVC film comprises the following steps:
s1, PVC pellet recovery: sorting, cleaning, airing and crushing the waste PVC plastics into granules with the particle size controlled between 3 and 5mm, soaking and cleaning the crushed PVC granules with acid liquor, washing with clear water and airing;
s2, screening and removing impurities: screening the PVC recycled granules in a screening machine, and further removing impurity particles to obtain a PVC recycled standby material;
s3, stirring and mixing: firstly adding the PVC recovery spare material and the PVC resin powder prepared in the step S2 into a temperature control stirrer for stirring and mixing at a low speed of 200-145 rpm for 1-3min at room temperature, then sequentially adding the composite plasticizer, the lubricant, the heat stabilizer, the nano titanium dioxide, the nano silicon dioxide and the antibacterial agent according to the proportion, setting the stirring speed of 600-800rpm and the stirring time of 160-200S at 145-128 ℃;
s4, banburying: adding the mixed powder obtained in the step S3 into an internal mixer, wherein the internal mixing time is 150-200S, and the motor current is 220A, so as to obtain colloid A;
s5, open mixing: putting the colloid A prepared in the step S4 into an open mill for rolling plasticization, setting the temperature of a roller to be 180-185 ℃, the linear speed of the roller to be 38-45m/min, then adjusting the temperature of the roller to be 175-180 ℃, and the speed of the roller to be 34-42m/min to obtain a colloid B;
s6, filtering: putting the colloid B prepared in the step S5 into a filter to further filter impurities, wherein the mesh number of the filter screen is 150-200 meshes, and preparing a molten filter material;
s7, roll forming: and (4) adding the molten filter material prepared in the step S6 into a calender for roll forming, and obtaining the PVC film after cooling, edge cutting and rolling.
By adopting the technical scheme, the waste PVC plastics are sorted, cleaned and crushed into granules, so that the primary impurity removal of the waste PVC plastics can be realized, the water-insoluble pollutants such as grease on the waste PVC plastics are further removed through acid soaking and cleaning, and the purpose of cleaning and recycling the waste PVC plastics for later use is achieved through screening and impurity removal; and then the aim of preparing the PVC film by mixing the PVC recycled aggregate and the PVC resin powder is fulfilled through the following steps of stirring, mixing, milling, filtering and roll forming, so that the utilization rate of the PVC raw material is effectively improved, and the raw material cost is reduced.
In conclusion, the invention has the following beneficial effects:
1. part of PVC recycled granules are added in the formula to replace part of PVC resin powder, so that the utilization rate of raw materials is effectively improved, and the cost of the raw materials is reduced;
2. by adding the composite plasticizer in the formula, the composite plasticizer comprises a solid plasticizer, DOP and DINP with the mass ratio of (1.5-3):1:1, the solid plasticizer has a specific pore structure and has adsorption performance on the plasticizer of smaller molecules of DOP and DINP, so that the composite plasticizer has a fixing effect on the small molecule plasticizer and prevents small molecule compounds from migrating and separating out, and the composite plasticizer can ensure that PVC resin is efficiently plasticized and simultaneously has the effect of reducing the separation effect of plasticizer molecules as much as possible through the mutual compounding and cooperation of the solid plasticizer, DOP and DINP;
3. by adding the nano titanium dioxide and the nano silicon dioxide into the formula, the nano titanium dioxide and the nano silicon dioxide have good dispersibility and weather resistance and excellent ultraviolet ray shielding property, and can increase the ultraviolet ray aging resistance of the PVC film, thereby achieving the effect of prolonging the practical service life of the PVC film;
4. by adding the organosilicon quaternary ammonium salt antibacterial agent into the formula, the antibacterial property of the PVC film can be obviously improved, and the flexibility, the antistatic property and the anti-pollution property of the PVC film can be improved.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Preparation examples 1 to 4 of composite plasticizer:
table 1 raw material ratio of composite plasticizer in preparation examples 1 to 4
The preparation method comprises the following steps: according to the proportion, the solid plasticizer is added into a stirring kettle, the rotating speed of a stirring paddle is set to be 200-300rpm, after stirring is carried out for 1min, DOP and DINP are added, stirring is continued for 3-5min until the mixture is uniformly stirred, the uniformly stirred composite plasticizer material is discharged into an aluminum plastic bag, and plastic packaging is carried out for standby.
Example (b):
example 1: a PVC film comprises 45 parts of PVC recycled granules, 60 parts of PVC resin powder, 20 parts of the composite plasticizer in preparation example 1, 0.8 part of lubricant, 3 parts of heat stabilizer, 2 parts of nano titanium dioxide, 2 parts of nano silicon dioxide and 0.2 part of organic silicon quaternary ammonium salt antibacterial agent, wherein the heat stabilizer comprises dioctyl tin dilaurate and epoxy soybean oil in a mass ratio of 2: 1;
the processing technology of the PVC film comprises the following steps: s1, PVC pellet recovery: sorting, cleaning, airing and crushing the waste PVC plastics into granules with the particle size controlled between 3 and 5mm, soaking and cleaning the crushed PVC granules with acid liquor, and then rinsing and airing the PVC granules with clean water;
s2, screening and removing impurities: screening the PVC recycled material particles in a screening machine, and further removing impurity particles to obtain a PVC recycled standby material;
s3, stirring and mixing: adding the PVC recycled spare material and the PVC resin powder prepared in the step S2 into a temperature-controlled stirrer, stirring and mixing at a low speed of 200rpm for 1min at room temperature, sequentially adding the composite plasticizer, the lubricant, the heat stabilizer, the nano titanium dioxide, the nano silicon dioxide and the antibacterial agent according to the proportion, setting the stirring speed at 600rpm, the stirring time at 160S and the temperature at 128-145 ℃;
s4, banburying: adding the mixed powder obtained in the step S3 into an internal mixer, wherein the internal mixing time is 150ss, and the motor current is 220A, so as to obtain colloid A;
s5, open mixing: putting the colloid A prepared in the step S4 into an open mill for rolling plasticization, setting the temperature of a roller to be 180-185 ℃, the linear speed of the roller to be 38-45m/min, then adjusting the temperature of the roller to be 175-180 ℃, and the speed of the roller to be 34-42m/min to obtain a colloid B;
s6, filtering: putting the colloid B prepared in the step S5 into a filter to further filter impurities, wherein the mesh number of the filter screen is 150-200 meshes, and preparing a molten filter material;
s7, roll forming: and (4) adding the molten filter material prepared in the step S6 into a calender for roll forming, and obtaining the PVC film after cooling, edge cutting and rolling.
Example 2: a PVC film comprises 50 parts of PVC recycled granules, 70 parts of PVC resin powder, 22 parts of composite plasticizer of preparation example 1, 0.9 part of lubricant, 5 parts of heat stabilizer, 2.2 parts of nano titanium dioxide, 2.2 parts of nano silicon dioxide and 0.22 part of organosilicon quaternary ammonium salt antibacterial agent, wherein the heat stabilizer comprises dioctyl tin dilaurate and epoxidized soybean oil in a mass ratio of 2: 1;
the processing technology of the PVC film comprises the following steps: s1, PVC pellet recovery: sorting, cleaning, airing and crushing the waste PVC plastics into granules with the particle size controlled between 3 and 5mm, soaking and cleaning the crushed PVC granules with acid liquor, and then rinsing and airing the PVC granules with clean water;
s2, screening and removing impurities: screening the PVC recycled material particles in a screening machine, and further removing impurity particles to obtain a PVC recycled standby material;
s3, stirring and mixing: adding the PVC recycled spare material and the PVC resin powder prepared in the step S2 into a temperature-controlled stirrer, stirring and mixing at a low speed of 200rpm for 1min at room temperature, sequentially adding the composite plasticizer, the lubricant, the heat stabilizer, the nano titanium dioxide, the nano silicon dioxide and the antibacterial agent according to the proportion, setting the stirring speed at 600rpm, the stirring time at 160S and the temperature at 128-145 ℃;
s4, banburying: adding the mixed powder obtained in the step S3 into an internal mixer, wherein the internal mixing time is 150ss, and the motor current is 220A, so as to obtain colloid A;
s5, open mixing: putting the colloid A prepared in the step S4 into an open mill for rolling plasticization, setting the temperature of a roller to be 180-185 ℃, the linear speed of the roller to be 38-45m/min, then adjusting the temperature of the roller to be 175-180 ℃, and the speed of the roller to be 34-42m/min to obtain a colloid B;
s6, filtering: putting the colloid B prepared in the step S5 into a filter to further filter impurities, wherein the mesh number of the filter screen is 150-200 meshes, and preparing a molten filter material;
s7, roll forming: and (4) adding the molten filter material prepared in the step S6 into a calender for roll forming, and obtaining the PVC film after cooling, edge cutting and rolling.
Example 3: a PVC film comprises 55 parts of PVC recycled granules, 75 parts of PVC resin powder, 24 parts of composite plasticizer of preparation example 2, 1.0 part of lubricant, 6 parts of heat stabilizer, 2.5 parts of nano titanium dioxide, 2.5 parts of nano silicon dioxide and 0.25 part of organosilicon quaternary ammonium salt antibacterial agent, wherein the heat stabilizer comprises dioctyl tin dilaurate and epoxidized soybean oil in a mass ratio of 2: 1;
the processing technology of the PVC film comprises the following steps: s1, PVC pellet recovery: sorting, cleaning, airing and crushing the waste PVC plastics into granules with the particle size controlled between 3 and 5mm, soaking and cleaning the crushed PVC granules with acid liquor, and then rinsing and airing the PVC granules with clean water;
s2, screening and removing impurities: screening the PVC recycled material particles in a screening machine, and further removing impurity particles to obtain a PVC recycled standby material;
s3, stirring and mixing: adding the PVC recycled spare material and the PVC resin powder prepared in the step S2 into a temperature-controlled stirrer, stirring and mixing at a low speed of 250rpm for 2min at room temperature, sequentially adding the composite plasticizer, the lubricant, the heat stabilizer, the nano titanium dioxide, the nano silicon dioxide and the antibacterial agent according to the proportion, setting the stirring speed at 700rpm, the stirring time at 180S and the temperature at 128-145 ℃;
s4, banburying: adding the mixed powder obtained in the step S3 into an internal mixer, wherein the internal mixing time is 180S, and the motor current is 220A, so as to obtain colloid A;
s5, open mixing: putting the colloid A prepared in the step S4 into an open mill for rolling plasticization, setting the temperature of a roller to be 180-185 ℃, the linear speed of the roller to be 38-45m/min, then adjusting the temperature of the roller to be 175-180 ℃, and the speed of the roller to be 34-42m/min to obtain a colloid B;
s6, filtering: putting the colloid B prepared in the step S5 into a filter to further filter impurities, wherein the mesh number of the filter screen is 150-200 meshes, and preparing a molten filter material;
s7, roll forming: and (4) adding the molten filter material prepared in the step S6 into a calender for roll forming, and obtaining the PVC film after cooling, edge cutting and rolling.
Example 4: a PVC film comprises 60 parts of PVC recycled granules, 80 parts of PVC resin powder, 26 parts of composite plasticizer of preparation example 2, 1.1 parts of lubricant, 7 parts of heat stabilizer, 2.8 parts of nano titanium dioxide, 2.8 parts of nano silicon dioxide and 0.28 part of organosilicon quaternary ammonium salt antibacterial agent, wherein the heat stabilizer comprises dioctyl tin dilaurate and epoxidized soybean oil in a mass ratio of 2: 1;
the processing technology of the PVC film comprises the following steps: s1, PVC pellet recovery: sorting, cleaning, airing and crushing the waste PVC plastics into granules with the particle size controlled between 3 and 5mm, soaking and cleaning the crushed PVC granules with acid liquor, and then rinsing and airing the PVC granules with clean water;
s2, screening and removing impurities: screening the PVC recycled material particles in a screening machine, and further removing impurity particles to obtain a PVC recycled standby material;
s3, stirring and mixing: adding the PVC recycled spare material and the PVC resin powder prepared in the step S2 into a temperature-controlled stirrer, stirring and mixing at a low speed of 250rpm for 2min at room temperature, sequentially adding the composite plasticizer, the lubricant, the heat stabilizer, the nano titanium dioxide, the nano silicon dioxide and the antibacterial agent according to the proportion, setting the stirring speed at 700rpm, the stirring time at 180S and the temperature at 128-145 ℃;
s4, banburying: adding the mixed powder obtained in the step S3 into an internal mixer, wherein the internal mixing time is 180S, and the motor current is 220A, so as to obtain colloid A;
s5, open mixing: putting the colloid A prepared in the step S4 into an open mill for rolling plasticization, setting the temperature of a roller to be 180-185 ℃, the linear speed of the roller to be 38-45m/min, then adjusting the temperature of the roller to be 175-180 ℃, and the speed of the roller to be 34-42m/min to obtain a colloid B;
s6, filtering: putting the colloid B prepared in the step S5 into a filter to further filter impurities, wherein the mesh number of the filter screen is 150-200 meshes, and preparing a molten filter material;
s7, roll forming: and (4) adding the molten filter material prepared in the step S6 into a calender for roll forming, and obtaining the PVC film after cooling, edge cutting and rolling.
Example 5: a PVC film comprises 65 parts of PVC recycled granules, 90 parts of PVC resin powder, 28 parts of composite plasticizer of preparation example 3, 1.2 parts of lubricant, 8 parts of heat stabilizer, 3 parts of nano titanium dioxide, 3 parts of nano silicon dioxide and 0.3 part of organosilicon quaternary ammonium salt antibacterial agent, wherein the heat stabilizer comprises dioctyl tin dilaurate and epoxidized soybean oil in a mass ratio of 2: 1;
the processing technology of the PVC film comprises the following steps: s1, PVC pellet recovery: sorting, cleaning, airing and crushing the waste PVC plastics into granules with the particle size controlled between 3 and 5mm, soaking and cleaning the crushed PVC granules with acid liquor, and then rinsing and airing the PVC granules with clean water;
s2, screening and removing impurities: screening the PVC recycled material particles in a screening machine, and further removing impurity particles to obtain a PVC recycled standby material;
s3, stirring and mixing: adding the PVC recycled spare material and the PVC resin powder prepared in the step S2 into a temperature-controlled stirrer, stirring and mixing at a low speed of 300rpm for 3min at room temperature, sequentially adding the composite plasticizer, the lubricant, the heat stabilizer, the nano titanium dioxide, the nano silicon dioxide and the antibacterial agent according to the proportion, setting the stirring speed to be 800rpm, stirring time to be 200S and temperature to be 128-145 ℃;
s4, banburying: adding the mixed powder obtained in the step S3 into an internal mixer, wherein the internal mixing time is 200S, and the motor current is 220A, so as to obtain colloid A;
s5, open mixing: putting the colloid A prepared in the step S4 into an open mill for rolling plasticization, setting the temperature of a roller to be 180-185 ℃, the linear speed of the roller to be 38-45m/min, then adjusting the temperature of the roller to be 175-180 ℃, and the speed of the roller to be 34-42m/min to obtain a colloid B;
s6, filtering: putting the colloid B prepared in the step S5 into a filter to further filter impurities, wherein the mesh number of the filter screen is 150-200 meshes, and preparing a molten filter material;
s7, roll forming: and (4) adding the molten filter material prepared in the step S6 into a calender for roll forming, and obtaining the PVC film after cooling, edge cutting and rolling.
Example 6: a PVC film comprises 60 parts of PVC recycled granules, 60 parts of PVC resin powder, 20 parts of composite plasticizer of preparation example 4, 0.8 part of lubricant, 3 parts of heat stabilizer, 2 parts of nano titanium dioxide, 2 parts of nano silicon dioxide and 0.2 part of organosilicon quaternary ammonium salt antibacterial agent, wherein the heat stabilizer comprises dioctyl tin dilaurate and epoxidized soybean oil in a mass ratio of 2: 1;
the processing technology of the PVC film comprises the following steps: s1, PVC pellet recovery: sorting, cleaning, airing and crushing the waste PVC plastics into granules with the particle size controlled between 3 and 5mm, soaking and cleaning the crushed PVC granules with acid liquor, and then rinsing and airing the PVC granules with clean water;
s2, screening and removing impurities: screening the PVC recycled material particles in a screening machine, and further removing impurity particles to obtain a PVC recycled standby material;
s3, stirring and mixing: adding the PVC recycled spare material and the PVC resin powder prepared in the step S2 into a temperature-controlled stirrer, stirring and mixing at a low speed of 200rpm for 1min at room temperature, sequentially adding the composite plasticizer, the lubricant, the heat stabilizer, the nano titanium dioxide, the nano silicon dioxide and the antibacterial agent according to the proportion, setting the stirring speed at 600rpm, the stirring time at 160S and the temperature at 128-145 ℃;
s4, banburying: adding the mixed powder obtained in the step S3 into an internal mixer, wherein the internal mixing time is 150ss, and the motor current is 220A, so as to obtain colloid A;
s5, open mixing: putting the colloid A prepared in the step S4 into an open mill for rolling plasticization, setting the temperature of a roller to be 180-185 ℃, the linear speed of the roller to be 38-45m/min, then adjusting the temperature of the roller to be 175-180 ℃, and the speed of the roller to be 34-42m/min to obtain a colloid B;
s6, filtering: putting the colloid B prepared in the step S5 into a filter to further filter impurities, wherein the mesh number of the filter screen is 150-200 meshes, and preparing a molten filter material;
s7, roll forming: and (4) adding the molten filter material prepared in the step S6 into a calender for roll forming, and obtaining the PVC film after cooling, edge cutting and rolling.
Comparative example:
comparative example 1: a PVC film and a processing technology thereof are different from those of the example 1 in that PVC resin powder is not added.
Comparative example 2: a PVC film and a processing technology thereof are different from those of the example 1 in that PVC recycled aggregates are not added.
Comparative example 3: a PVC film and a processing technology thereof are different from those of the PVC film in example 1 in that no solid plasticizer is added.
Comparative example 4: a PVC film and a processing technology thereof are different from those of the PVC film in example 1 in that epoxidized soybean oil is not added.
Comparative example 5: a PVC film and a processing technology thereof are different from those of the PVC film in the embodiment 1 in that titanium dioxide is not added.
Comparative example 6: a PVC film and a processing technology thereof are different from those of the PVC film in the embodiment 1 in that silicon dioxide is not added.
Comparative example 7: a PVC film and a processing technology thereof are different from those of the PVC film in example 1 in that no antibacterial agent is added.
Performance detection
6 sample films each having a uniform size were prepared according to the methods of examples 1 to 6 and comparative examples 1 to 7, and the following properties of the sample films were measured, and the test results of the sample films prepared according to the same examples and comparative examples were averaged and shown in Table 1:
as can be seen from Table 1, the test results of tensile strength, longitudinal elongation at break after aging, heating loss rate and dimensional change rate of examples 1-5 are all better than the corresponding test results of example 6, which shows that increasing the proportion of PVC recycled granules in the formula to the same proportion of PVC resin powder can affect the material performance of the finished PVC film;
as can be seen from comparative examples 1 and 2, the performance test of the sample film prepared by only using PVC resin powder is obviously better than that of the sample film prepared by only using PVC recycled granules; as can be seen from the comparative example 3, the mechanical property and thermal stability test results of the sample film lacking the solid plasticizer are reduced, which shows that the addition of the solid plasticizer is obviously beneficial to the material performance of the PVC film;
as can be seen from comparative example 4, the addition of epoxidized soybean oil can also improve the mechanical properties and thermal stability of the PVC film; the longitudinal elongation at break test results of comparative examples 5 and 6 after aging show that the light aging resistance of the PVC film is obviously improved by the nano titanium dioxide and the nano silicon dioxide; as can be seen from comparative example 7, the addition of the antibacterial agent in the formulation can significantly improve the antibacterial performance of the PVC film.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (9)
1. A PVC film characterized by: the PVC composite material comprises 45-65 parts of PVC recycled particles, 60-90 parts of PVC resin powder, 20-28 parts of composite plasticizer, 0.8-1.2 parts of lubricant and 3-8 parts of heat stabilizer, wherein the composite plasticizer comprises solid plasticizer, DOP and DINP in a mass ratio of (1.5-3) to 1: 1.
2. A PVC film according to claim 1, characterized in that: the solid plasticizer is poly propylene glycol adipate.
3. A PVC film according to claim 1, characterized in that: the heat stabilizer comprises dioctyl tin dilaurate and epoxidized soybean oil in a mass ratio of 2: 1.
4. A PVC film according to claim 1, characterized in that: the lubricant is one or more of stearate and glyceryl stearate fatty acid amide lubricants.
5. A PVC film according to claim 1, characterized in that: the product also comprises 2-3 parts of nano titanium dioxide and 2-3 parts of nano silicon dioxide.
6. A PVC film according to claim 5, characterized in that: the nano titanium dioxide is rutile type titanium dioxide with the particle size range of 20-40 nm.
7. A PVC film according to claim 5, characterized in that: the nano silicon dioxide is fumed silica with the particle size of 10-20 nm.
8. A PVC film according to claim 1, characterized in that: the product also comprises 0.2-0.3 part of antibacterial agent which is organosilicon quaternary ammonium salt antibacterial agent.
9. Process for the production of PVC films according to any one of claims 1 to 7, comprising the following steps:
s1, PVC pellet recovery: sorting, cleaning, airing and crushing the waste PVC plastics into granules with the particle size controlled between 3 and 5mm, soaking and cleaning the crushed PVC granules with acid liquor, washing with clear water and airing;
s2, screening and removing impurities: screening the PVC recycled material particles in a screening machine, and further removing impurity particles to obtain a PVC recycled standby material;
s3, stirring and mixing: firstly adding the PVC recovery spare material and the PVC resin powder prepared in the step S2 into a temperature control stirrer for stirring and mixing at a low speed of 200-145 rpm for 1-3min at room temperature, then sequentially adding the composite plasticizer, the lubricant, the heat stabilizer, the nano titanium dioxide, the nano silicon dioxide and the antibacterial agent according to the proportion, setting the stirring speed of 600-800rpm and the stirring time of 160-200S at 145-128 ℃;
s4, banburying: adding the mixed powder obtained in the step S3 into an internal mixer, wherein the internal mixing time is 150-200S, and the motor current is 220A, so as to obtain colloid A;
s5, open mixing: putting the colloid A prepared in the step S4 into an open mill for rolling plasticization, setting the temperature of a roller to be 180-185 ℃, the linear speed of the roller to be 38-45m/min, then adjusting the temperature of the roller to be 175-180 ℃, and the speed of the roller to be 34-42m/min to obtain a colloid B;
s6, filtering: putting the colloid B prepared in the step S5 into a filter to further filter impurities, wherein the mesh number of the filter screen is 150-200 meshes, and preparing a molten filter material;
s7, roll forming: and (4) adding the molten filter material prepared in the step S6 into a calender for roll forming, and obtaining the PVC film after cooling, edge cutting and rolling.
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