CN117227128A - Transparent impact-resistant PVC coiled material and preparation method thereof - Google Patents
Transparent impact-resistant PVC coiled material and preparation method thereof Download PDFInfo
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- CN117227128A CN117227128A CN202311520690.9A CN202311520690A CN117227128A CN 117227128 A CN117227128 A CN 117227128A CN 202311520690 A CN202311520690 A CN 202311520690A CN 117227128 A CN117227128 A CN 117227128A
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- 239000000463 material Substances 0.000 title claims abstract description 164
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 63
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 56
- 239000011347 resin Substances 0.000 claims abstract description 45
- 229920005989 resin Polymers 0.000 claims abstract description 45
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- 238000003490 calendering Methods 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 25
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- 238000004513 sizing Methods 0.000 claims description 41
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- IHBCFWWEZXPPLG-UHFFFAOYSA-N [Ca].[Zn] Chemical compound [Ca].[Zn] IHBCFWWEZXPPLG-UHFFFAOYSA-N 0.000 claims description 26
- 238000001035 drying Methods 0.000 claims description 24
- 238000004140 cleaning Methods 0.000 claims description 15
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- OEIWPNWSDYFMIL-UHFFFAOYSA-N dioctyl benzene-1,4-dicarboxylate Chemical compound CCCCCCCCOC(=O)C1=CC=C(C(=O)OCCCCCCCC)C=C1 OEIWPNWSDYFMIL-UHFFFAOYSA-N 0.000 claims description 10
- MQIUGAXCHLFZKX-UHFFFAOYSA-N Di-n-octyl phthalate Natural products CCCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC MQIUGAXCHLFZKX-UHFFFAOYSA-N 0.000 claims description 4
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical group CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 claims description 4
- 238000002834 transmittance Methods 0.000 abstract description 13
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- 239000002994 raw material Substances 0.000 abstract description 7
- 229910052761 rare earth metal Inorganic materials 0.000 abstract description 6
- 150000002910 rare earth metals Chemical class 0.000 abstract description 6
- 229920000915 polyvinyl chloride Polymers 0.000 description 252
- 239000004800 polyvinyl chloride Substances 0.000 description 252
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Abstract
The invention discloses a transparent impact-resistant PVC coiled material and a preparation method thereof, and belongs to the field of PVC coiled materials. According to the invention, the PVC resin with a high K value is used as the raw material for producing PVC coiled materials such as PVC films, and the PVC films are washed by pure water added with NaOH after the PVC films are calendered and molded, so that the PVC films have high transparency, the light transmittance is more than 90%, and the cost is lower compared with a mode of improving the transparency of the PVC films by using the rare earth composite stabilizer. According to the invention, the PVC film is rolled by the six-roller calender, and the temperature of six-roller delay is strictly controlled, so that the PVC film with the thickness of 1.2mm and more than 1.2mm can be obtained by one-time rolling molding, the preparation procedures of PVC coiled materials such as the PVC film can be reduced, the production efficiency can be improved, and the transparency and the impact resistance of the PVC film obtained by rolling molding are ensured to be high.
Description
Technical Field
The invention relates to the field of PVC coiled materials, in particular to a transparent impact-resistant PVC coiled material and a preparation method thereof.
Background
PVC (polyvinyl chloride) coils typically include PVC films, PVC wallpaper, PVC flooring, and the like. Wherein, the PVC film is a film material made of PVC (polyvinyl chloride), and has excellent chemical resistance, weather resistance and plasticity. According to different purposes and requirements, the PVC film can have different thickness, color, texture and surface characteristics, so that the PVC film can be used in a plurality of fields such as architectural decoration, food packaging, medical supplies, advertisement marks and the like. In addition, PVC films are also important materials for producing exercise equipment such as yobo balls, and thus, PVC films required for such exercise equipment are generally required to have a relatively large thickness and good impact resistance.
However, the conventional thick PVC film with a thickness of 1mm or more is usually formed by compounding a plurality of thin films, and the number of preparation processes is large, which leads to an increase in production cycle, an increase in production cost, and a decrease in production efficiency. In order to ensure that the transparency of the PVC film with thicker thickness is better, the visual field can be clear when a user enters the Youyou wave ball to rotate or roll the Youyou wave ball, and the rare earth composite stabilizer is added into the PVC film, so that the transparency of the PVC film is outstanding; however, the use cost of the rare earth composite stabilizer is high, and the production cost of the PVC film is increased, so that the selling price of the PVC film product is high.
It can be seen that there is a need for improvements and improvements in the art.
Disclosure of Invention
In view of the shortcomings of the prior art, the invention aims to provide a transparent impact-resistant PVC coiled material and a preparation method thereof, and aims to solve the problems of more preparation procedures and high production cost of the existing thicker PVC film.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention provides a preparation method of a transparent impact-resistant PVC coiled material, which comprises the following steps:
s001, feeding the mixed plasticizer, the calcium-zinc composite stabilizer and the PVC resin with the K value of 1750 to 1800 into a planetary extruder for preplasticizing;
s002, after pre-plasticizing by the planetary extruder, conveying the sizing material into a filtering extruder for secondary plasticizing;
s003, feeding the sizing material extruded by the filtering extruder into a six-roller calender, and calendering the sizing material into PVC coiled materials by the six-roller calender, wherein the temperature of the six rollers is 215-220 ℃;
s004, cleaning the rolled PVC coiled material by a pure water tank, wherein NaOH is added into the pure water tank, and the concentration of the NaOH is 10-15 g/L;
s005, after the PVC coiled material is cleaned, drying the PVC coiled material, and then cooling and shaping;
and S006. After cooling and shaping the PVC coiled material, coiling the PVC coiled material, and then placing the coiled PVC coiled material in a refrigerating chamber for refrigerating.
Further, in step S001, the extrusion temperature of the planetary extruder is 200-220 ℃, and the pre-plasticizing time is 3-4 min.
Further, in the step S002, the temperature of the filtering extruder is 110-130 ℃, 130-150 ℃, 150-155 ℃ and the secondary plasticizing time is 10-15 min respectively.
Further, in step S003, the rotation speeds of the six rollers are sequentially set as follows in the feeding-to-discharging direction: 36-38 m/min, 39-41 m/min, 44-46 m/min, 48-50 m/min, 53-55 m/min and 60m/min.
Further, in step S004, the temperature of the pure water in the pure water tank is controlled to be 40+ -2 ℃.
Further, the drying temperature is 160-180 ℃, and the cooling and shaping temperature is 0-25 ℃.
Further, the plasticizer is dioctyl phthalate or dioctyl terephthalate.
Further, the PVC resin is 95-105 parts by weight, the plasticizer is 50-60 parts by weight, and the calcium-zinc composite stabilizer is 1-2 parts by weight.
The invention also provides a transparent impact-resistant PVC coiled material, which is prepared by the preparation method of the transparent impact-resistant PVC coiled material.
The beneficial effects of the invention are as follows: the invention provides a transparent impact-resistant PVC coiled material and a preparation method thereof, wherein a high-K PVC resin is used as a raw material for producing PVC coiled materials such as PVC films, and the PVC films are washed by pure water added with NaOH after the PVC films are calendered and molded, so that the PVC films have high transparency, the light transmittance is more than 90 percent, and the cost is lower compared with a mode of using a rare earth composite stabilizer to improve the transparency of the PVC films. According to the invention, the PVC film is rolled by the six-roller calender, and the temperature of six-roller delay is strictly controlled, so that the PVC film with the thickness of 1.2mm and more than 1.2mm can be obtained by one-time rolling molding, the preparation procedures of PVC coiled materials such as the PVC film can be reduced, the production efficiency can be improved, and the transparency and the impact resistance of the PVC film obtained by rolling molding are ensured to be high.
Detailed Description
The invention provides a transparent impact-resistant PVC coiled material and a preparation method thereof, which are used for making the purposes, technical schemes and effects of the invention clearer and more definite, and the invention is further described in detail in the following examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The invention provides a preparation method of a transparent impact-resistant PVC coiled material, which comprises the following steps:
s001, feeding the mixed plasticizer, the calcium-zinc composite stabilizer and the PVC resin with the K value of 1750-1800 into a planetary extruder for pre-plasticizing to improve the fluidity of the PVC resin, so that the PVC resin is more suitable for forming and processing, and the energy consumption required by the subsequent secondary plasticizing is reduced;
s002, conveying the sizing material to a filtering extruder for secondary plasticization after the planetary extruder is pre-plasticized to ensure that the PVC resin achieves optimal fluidity and plasticity, and the sizing material is easier to flow and deform during calendaring molding, so that a smooth and uniform PVC film can be obtained; in addition, impurities in the sizing material are filtered out through a filtering extruder, so that the transparency of the PVC film can be improved;
s003, feeding the sizing material extruded by the filtering extruder into a six-roller calender, and calendering the sizing material into a PVC film by the six-roller calender, wherein the temperature of the six rollers is 215-220 ℃; compared with a four-roll or five-roll calender, the six-roll calender can enable the sizing material to be extruded and sheared for more times, enhance the plasticizing effect of the sizing material, enable the PVC film obtained through calendering to be high in transparency, avoid dark or turbid flaws, and enable the PVC film obtained through calendering to be thick;
s004, cleaning the calendered PVC film by a pure water tank to clean precipitated particles and greasy dirt on the surface of the PVC film, so as to maintain the cleanliness of the surface of the PVC film and further improve the transparency of the PVC film; in addition, naOH is added into the pure water, the concentration of the NaOH is 10-15 g/L, so that the pure water is alkaline to a certain extent, and the acidic components in the plasticizer precipitated on the surface of the PVC film can be neutralized, so that the surface of the PVC film is easier to clean, and the transparency of the PVC film is improved;
s005, after the PVC film is cleaned, drying the PVC film, and then cooling and shaping;
s006. After the PVC film is cooled and shaped, the PVC film is wound, and the wound PVC film is placed in a refrigerating chamber for refrigeration, so that the PVC film is prevented from being bonded after being wound.
The invention does not use rare earth composite stabilizer in raw materials to improve the transparency of the PVC film, but uses the PVC resin with K value, namely the polymerization degree of 1750 to 1800 in the raw materials, and improves the transparency of the PVC film by utilizing the characteristics of more ordered molecular arrangement and small mutual interference among chains of the PVC resin with high polymerization degree; after the PVC film is rolled and formed, the PVC film is cleaned by pure water added with NaOH, so that the surface of the PVC film is easier to clean, and the transparency of the PVC film can be improved with lower production cost. The PVC film has high transparency, and the PVC film has excellent shock resistance, and the PVC coiled material can be used as the material for producing body-building sports equipment such as Youbo ball, and the produced Youbo ball has clear visual field and small potential safety hazard when in use.
Compared with a four-roll or five-roll calender, the six-roll calender can enable the sizing material to be extruded and sheared for more times, so that the plasticizing effect of the sizing material is enhanced, the sizing material is fully exhausted, the thickness of the calendered PVC film is enabled to be thoroughly made, and the thickness can reach 1.2mm or even more than 1.2 mm. Because the PVC resin with high polymerization degree needs higher temperature to arrange molecules orderly, the invention controls the temperature of the rolling of six rollers to be 215-220 ℃, which not only shortens the time of pre-plasticizing and secondary plasticizing, but also ensures that the molecular chains of the PVC resin with high polymerization degree are easy to slip and arrange more orderly, thereby achieving better ductility and plastic deformation capability, and further ensuring that the PVC film formed by rolling has good flatness and high transparency. Compared with the mode of obtaining a thicker PVC film by the existing composite multi-layer PVC film, the method can obtain the PVC film with the thickness of 1.2mm and more than 1.2mm by one-time calendaring, so that the preparation procedures of PVC coiled materials such as the PVC film can be reduced, and the production efficiency can be improved.
Further, in step S001, the extrusion temperature of the planetary extruder is 200-220 ℃, and the pre-plasticizing time is 3-4 min. In the pre-plasticizing process, the materials can generate heat through friction with the screw and the machine barrel of the extruder, so that certain heat can be provided for plasticizing the PVC resin, therefore, the pre-plasticizing time is shortened to 3-4 min, the extrusion temperature of the planetary extruder is controlled to be 200-220 ℃, the fluidity of the PVC resin can be ensured to be improved, and the plasticizer and the calcium-zinc composite stabilizer can be uniformly dispersed in the PVC resin.
In addition, the consumption of the calcium-zinc composite stabilizer can be reduced by shortening the preplasticizing time, the production efficiency is improved, the raw material cost is reduced, and meanwhile, less stabilizer can be separated out from the PVC film in the long-time use process, so that the PVC film can maintain higher transparency after long-time use.
Further, in step S002, the temperature of the filtering extruder is 110-130 ℃, 130-150 ℃, 150-155 ℃ and the secondary plasticizing time is 10-15 min. The pre-plasticizing treatment can improve the fluidity of the PVC resin, so that the plasticizing temperature can be reduced during secondary plasticizing, the condition that the PVC resin is burnt and instantaneously coked to further influence the quality of the PVC film can be avoided; and when the plasticizing time is 10-15 min, the dosage of the calcium-zinc composite stabilizer can be reduced, so that the PVC film can maintain high transparency.
Further, in step S003, the rotation speeds of the six rollers are sequentially set as follows in the feeding-to-discharging direction: 36-38 m/min, 39-41 m/min, 44-46 m/min, 48-50 m/min, 53-55 m/min and 60m/min. According to the invention, the rotating speed of the six rollers is controlled, so that the rotating speed ratio of the rear roller to the front roller in the feeding and discharging direction is controlled to be about 1:1, and the rotating speed of the last roller is controlled to be 60m/min, the plasticizing effect of the sizing material can be optimized, the thickness of the calendered PVC film is ensured to be more than 1.2mm, and the PVC film can maintain high flatness.
Further, in step S004, the temperature of the pure water in the pure water tank is controlled to be 40+ -2 ℃. The pure water temperature is too low, the cooling requirement of enterprises can be increased, the energy consumption can be increased, and the low-temperature pure water has poor dissolving capability on greasy dirt and the like, so that the cleaning effect of the PVC film can be influenced; the pure water temperature in the pure water tank is controlled at 40+/-2 ℃, so that the physical properties of the PVC film are not affected, the cleaning effect of the PVC film can be ensured, and the energy consumption of enterprises is reduced.
Further, in step S005, the drying temperature is 160-180 ℃, and the cooling and shaping temperature is 0-25 ℃. The drying can be realized by a heating roller with heat conducting oil, and the drying temperature can ensure that the PVC film is sufficiently dried; the cooling shaping can be realized by a cooling roller which is filled with ice water, low-temperature water or low-temperature heat conduction oil.
Further, in the step S006, the refrigerating temperature is 7-8 ℃ and the refrigerating time is more than 2 hours, so that the rolled PVC film can be ensured to be sufficiently cooled and not bonded together; and the cold storage time is less than 2 hours, and when the cooling temperature is higher than the temperature range, the PVC film is insufficiently cooled and still is easy to adhere together.
Further, the plasticizer is dioctyl phthalate or dioctyl terephthalate, and can increase the plasticity of the PVC resin, so that the PVC resin is easy to process and mold, and the transparency of the PVC film is improved; the calcium-zinc composite stabilizer can improve the plasticity of PVC resin and reduce the decomposition of PVC resin at high temperature.
Further, in the step S001, the PVC resin is 95 to 105 parts by weight, the plasticizer is 50 to 60 parts by weight, and the calcium-zinc composite stabilizer is 1 to 2 parts by weight. According to the PVC film rolling device, the PVC film is rolled by the six-roller calender, the temperature of six-roller calendering is controlled, the time of pre-plasticizing and secondary plasticizing can be shortened, the using amount of the stabilizer is reduced, the production efficiency is improved, the raw material cost is reduced, and the PVC film can be used for a long time and can maintain higher transparency.
The invention also provides a transparent impact-resistant PVC coiled material, which is specifically a PVC film, and is prepared by the preparation method of the transparent impact-resistant PVC coiled material. Compared with the existing PVC composite thick film, the PVC film prepared by the method has low price, the thickness can be 1.2mm or more than 1.2mm, and the PVC film has high transparency and high impact strength.
To further illustrate the clear impact resistant PVC coil stock provided by the present invention and the method of making the same, the following examples and comparative examples are provided.
Example 1
The embodiment provides a preparation method of a PVC coiled material, which comprises the following steps:
s001, feeding the mixed plasticizer, the calcium-zinc composite stabilizer and the PVC resin with the K value of 1750 into a planetary extruder for preplasticizing, wherein the extrusion temperature of the planetary extruder is 200 ℃, and the preplasticizing time is 3min;
s002, after pre-plasticizing by the planetary extruder, conveying the sizing material into a filtering extruder for secondary plasticizing, wherein the temperature of the filtering extruder is 110 ℃,130 ℃,150 ℃ and the secondary plasticizing time is 10min;
s003, feeding the sizing material extruded by the filtering extruder into a six-roller calender, and calendering the sizing material into a PVC coiled material through the six-roller calender, wherein the temperature of the six rollers is 220 ℃, and the rotating speed of the six rollers is sequentially set as follows along the feeding-discharging direction: 36m/min,39m/min,44m/min,48m/min,53m/min and 60m/min;
s004, cleaning the rolled PVC coiled material by a pure water tank, wherein the temperature of pure water in the pure water tank is controlled to be 40+/-2 ℃, naOH is added into the pure water, and the concentration of the NaOH is 10g/L;
s005, after the PVC coiled material is cleaned, drying the PVC coiled material, and then cooling and shaping, wherein the drying temperature is 160 ℃, and the cooling and shaping temperature is 0 ℃;
s006. After cooling and shaping the PVC coiled material, coiling the PVC coiled material, and then placing the coiled PVC coiled material in a refrigerating chamber for refrigerating, wherein the refrigerating temperature is 7 ℃, and the refrigerating time is 2 hours.
In step S001 of this embodiment, the plasticizer is dioctyl phthalate; further, the PVC resin is 95 parts by weight, the plasticizer is 50 parts by weight, and the calcium-zinc stabilizer is 1 part by weight.
The embodiment also provides a PVC coiled material, which is prepared by the preparation method of the PVC coiled material provided by the embodiment.
Example 2
The embodiment provides a preparation method of a PVC coiled material, which comprises the following steps:
s001, feeding the mixed plasticizer, the calcium-zinc composite stabilizer and the PVC resin with the K value of 1800 into a planetary extruder for preplasticizing, wherein the extrusion temperature of the planetary extruder is 220 ℃, and the preplasticizing time is 4min;
s002, after pre-plasticizing by the planetary extruder, conveying the sizing material into a filtering extruder for secondary plasticizing, wherein the temperature of the filtering extruder is 130 ℃,150 ℃,155 ℃ and the secondary plasticizing time is 15min;
s003, feeding the sizing material extruded by the filtering extruder into a six-roller calender, and calendering the sizing material into a PVC coiled material through the six-roller calender, wherein the temperature of the six rollers is 215 ℃, and the rotating speed of the six rollers is sequentially set as follows along the feeding-discharging direction: 38m/min,41m/min,46m/min,50m/min,55m/min and 60m/min;
s004, cleaning the rolled PVC coiled material through a pure water tank, wherein the temperature of pure water in the pure water tank is controlled to be 40+/-2 ℃, naOH is added into the pure water, and the concentration of the NaOH is 15g/L;
s005, after the PVC coiled material is cleaned, drying the PVC coiled material, and then cooling and shaping, wherein the drying temperature is 180 ℃, and the cooling and shaping temperature is 25 ℃;
s006. After cooling and shaping the PVC coiled material, coiling the PVC coiled material, and then placing the coiled PVC coiled material in a refrigerating chamber for refrigerating, wherein the refrigerating temperature is 8 ℃, and the refrigerating time is 2 hours.
In step S001 of this embodiment, the plasticizer is dioctyl terephthalate; further, the PVC resin is 105 parts, the plasticizer is 60 parts, and the calcium-zinc composite stabilizer is 2 parts by weight.
The embodiment also provides a PVC coiled material, which is prepared by the preparation method of the PVC coiled material provided by the embodiment.
Comparative example 1
The comparative example provides a method for preparing a PVC coiled material, comprising the following steps:
s001, feeding the mixed plasticizer, the calcium-zinc composite stabilizer and the PVC resin with the K value of 1300 into a planetary extruder for preplasticizing, wherein the extrusion temperature of the planetary extruder is 220 ℃, and the preplasticizing time is 4min;
s002, after pre-plasticizing by the planetary extruder, conveying the sizing material into a filtering extruder for secondary plasticizing, wherein the temperature of the filtering extruder is 130 ℃,150 ℃,155 ℃ and the secondary plasticizing time is 15min;
s003, feeding the sizing material extruded by the filtering extruder into a six-roller calender, and calendering the sizing material into a PVC coiled material through the six-roller calender, wherein the temperature of the six rollers is 215 ℃, and the rotating speed of the six rollers is sequentially set as follows along the feeding-discharging direction: 38m/min,41m/min,46m/min,50m/min,55m/min and 60m/min;
s004, cleaning the rolled PVC coiled material through a pure water tank, wherein the temperature of pure water in the pure water tank is controlled to be 40+/-2 ℃, naOH is added into the pure water, and the concentration of the NaOH is 15g/L;
s005, after the PVC coiled material is cleaned, drying the PVC coiled material, and then cooling and shaping, wherein the drying temperature is 180 ℃, and the cooling and shaping temperature is 25 ℃;
s006. After cooling and shaping the PVC coiled material, coiling the PVC coiled material, and then placing the coiled PVC coiled material in a refrigerating chamber for refrigerating, wherein the refrigerating temperature is 8 ℃, and the refrigerating time is 2 hours.
In the step S001 of the comparative example, the plasticizer is dioctyl terephthalate; further, the PVC resin is 105 parts, the plasticizer is 60 parts, and the calcium-zinc composite stabilizer is 2 parts by weight.
The present comparative example also provides a PVC coil made from the method of making the PVC coil provided by the present comparative example.
Comparative example 2
The comparative example provides a method for preparing a PVC coiled material, comprising the following steps:
s001, feeding the mixed plasticizer, the calcium-zinc composite stabilizer and the PVC resin with the K value of 1800 into a planetary extruder for preplasticizing, wherein the extrusion temperature of the planetary extruder is 220 ℃, and the preplasticizing time is 4min;
s002, after pre-plasticizing by the planetary extruder, conveying the sizing material into a filtering extruder for secondary plasticizing, wherein the temperature of the filtering extruder is 130 ℃,150 ℃,155 ℃ and the secondary plasticizing time is 15min;
s003, feeding the sizing material extruded by the filtering extruder into a six-roller calender, and calendering the sizing material into a PVC coiled material through the six-roller calender, wherein the temperature of the six rollers is 215 ℃, and the rotating speed of the six rollers is sequentially set as follows along the feeding-discharging direction: 38m/min,41m/min,46m/min,50m/min,55m/min and 60m/min;
s004, cleaning the rolled PVC coiled material through a pure water tank, wherein the temperature of pure water in the pure water tank is controlled to be 40+/-2 ℃, and NaOH is not added into the pure water;
s005, after the PVC coiled material is cleaned, drying the PVC coiled material, and then cooling and shaping, wherein the drying temperature is 180 ℃, and the cooling and shaping temperature is 25 ℃;
s006. After cooling and shaping the PVC coiled material, coiling the PVC coiled material, and then placing the coiled PVC coiled material in a refrigerating chamber for refrigerating, wherein the refrigerating temperature is 8 ℃, and the refrigerating time is 2 hours.
In the step S001 of the comparative example, the plasticizer is dioctyl terephthalate; further, the PVC resin is 105 parts, the plasticizer is 60 parts, and the calcium-zinc composite stabilizer is 2 parts by weight.
The present comparative example also provides a PVC coil made from the method of making the PVC coil provided by the present comparative example.
Comparative example 3
The comparative example provides a method for preparing a PVC coiled material, comprising the following steps:
s001, feeding the mixed plasticizer, the calcium-zinc composite stabilizer and the PVC resin with the K value of 1800 into a planetary extruder for preplasticizing, wherein the extrusion temperature of the planetary extruder is 220 ℃, and the preplasticizing time is 4min;
s002, after pre-plasticizing by the planetary extruder, conveying the sizing material into a filtering extruder for secondary plasticizing, wherein the temperature of the filtering extruder is 130 ℃,150 ℃,155 ℃ and the secondary plasticizing time is 15min;
s003, feeding the sizing material extruded by the filtering extruder into a six-roller calender, and calendering the sizing material into a PVC coiled material through the six-roller calender, wherein the temperature of the six rollers is 190 ℃, and the rotating speed of the six rollers is sequentially set as follows along the feeding-discharging direction: 38m/min,41m/min,46m/min,50m/min,55m/min and 60m/min;
s004, cleaning the rolled PVC coiled material through a pure water tank, wherein the temperature of pure water in the pure water tank is controlled to be 40+/-2 ℃, naOH is added into the pure water, and the concentration of the NaOH is 15g/L;
s005, after the PVC coiled material is cleaned, drying the PVC coiled material, and then cooling and shaping, wherein the drying temperature is 180 ℃, and the cooling and shaping temperature is 25 ℃;
s006. After cooling and shaping the PVC coiled material, coiling the PVC coiled material, and then placing the coiled PVC coiled material in a refrigerating chamber for refrigerating, wherein the refrigerating temperature is 8 ℃, and the refrigerating time is 2 hours.
In the step S001 of the comparative example, the plasticizer is dioctyl terephthalate; further, the PVC resin is 105 parts, the plasticizer is 60 parts, and the calcium-zinc composite stabilizer is 2 parts by weight.
The present comparative example also provides a PVC coil made from the method of making the PVC coil provided by the present comparative example.
Comparative example 4
The comparative example provides a method for preparing a PVC coiled material, comprising the following steps:
s001, feeding the mixed plasticizer, the calcium-zinc composite stabilizer and the PVC resin with the K value of 1800 into a planetary extruder for preplasticizing, wherein the extrusion temperature of the planetary extruder is 220 ℃, and the preplasticizing time is 4min;
s002, after pre-plasticizing by the planetary extruder, conveying the sizing material into a filtering extruder for secondary plasticizing, wherein the temperature of the filtering extruder is 130 ℃,150 ℃,155 ℃ and the secondary plasticizing time is 15min;
s003, feeding the sizing material extruded by the filtering extruder into a six-roller calender, and calendering the sizing material into a PVC coiled material through the six-roller calender, wherein the temperature of the six rollers is 210 ℃, and the rotating speed of the six rollers is sequentially set as follows along the feeding-discharging direction: 38m/min,41m/min,46m/min,50m/min,55m/min and 60m/min;
s004, cleaning the rolled PVC coiled material through a pure water tank, wherein the temperature of pure water in the pure water tank is controlled to be 40+/-2 ℃, naOH is added into the pure water, and the concentration of the NaOH is 15g/L;
s005, after the PVC coiled material is cleaned, drying the PVC coiled material, and then cooling and shaping, wherein the drying temperature is 180 ℃, and the cooling and shaping temperature is 25 ℃;
s006. After cooling and shaping the PVC coiled material, coiling the PVC coiled material, and then placing the coiled PVC coiled material in a refrigerating chamber for refrigerating, wherein the refrigerating temperature is 8 ℃, and the refrigerating time is 2 hours.
In the step S001 of the comparative example, the plasticizer is dioctyl terephthalate; further, the PVC resin is 105 parts, the plasticizer is 60 parts, and the calcium-zinc composite stabilizer is 2 parts by weight.
The present comparative example also provides a PVC coil made from the method of making the PVC coil provided by the present comparative example.
Comparative example 5
The comparative example provides a method for preparing a PVC coiled material, comprising the following steps:
s001, feeding the mixed plasticizer, the calcium-zinc composite stabilizer and the PVC resin with the K value of 1800 into a planetary extruder for preplasticizing, wherein the extrusion temperature of the planetary extruder is 220 ℃, and the preplasticizing time is 4min;
s002, after pre-plasticizing by the planetary extruder, conveying the sizing material into a filtering extruder for secondary plasticizing, wherein the temperature of the filtering extruder is 130 ℃,150 ℃,155 ℃ and the secondary plasticizing time is 15min;
s003, feeding the sizing material extruded by the filtering extruder into a six-roller calender, and calendering the sizing material into a PVC coiled material through the six-roller calender, wherein the temperature of the six rollers is 190 ℃, and the rotating speed of the six rollers is sequentially set as follows along the feeding-discharging direction: 38m/min,41m/min,46m/min,50m/min,55m/min and 60m/min;
s004, cleaning the rolled PVC coiled material through a pure water tank, wherein the temperature of pure water in the pure water tank is controlled to be 40+/-2 ℃, and NaOH is not added into the pure water;
s005, after the PVC coiled material is cleaned, drying the PVC coiled material, and then cooling and shaping, wherein the drying temperature is 180 ℃, and the cooling and shaping temperature is 25 ℃;
s006. After cooling and shaping the PVC coiled material, coiling the PVC coiled material, and then placing the coiled PVC coiled material in a refrigerating chamber for refrigerating, wherein the refrigerating temperature is 8 ℃, and the refrigerating time is 2 hours.
In the step S001 of the comparative example, the plasticizer is dioctyl terephthalate; further, the PVC resin is 105 parts, the plasticizer is 60 parts, and the calcium-zinc composite stabilizer is 2 parts by weight.
The present comparative example also provides a PVC coil made from the method of making the PVC coil provided by the present comparative example.
Comparative example 6
The comparative example provides a method for preparing a PVC coiled material, comprising the following steps:
s001, feeding the mixed plasticizer, the calcium-zinc composite stabilizer and the PVC resin with the K value of 1800 into a planetary extruder for preplasticizing, wherein the extrusion temperature of the planetary extruder is 220 ℃, and the preplasticizing time is 4min;
s002, after pre-plasticizing by the planetary extruder, conveying the sizing material into a filtering extruder for secondary plasticizing, wherein the temperature of the filtering extruder is 130 ℃,150 ℃,155 ℃ and the secondary plasticizing time is 15min;
s003, feeding the sizing material extruded by the filtering extruder into a six-roller calender, and calendering the sizing material into a PVC coiled material through the six-roller calender, wherein the temperature of the six rollers is 215 ℃, and the rotating speed of the six rollers is sequentially set as follows along the feeding-discharging direction: 38m/min,41m/min,46m/min,50m/min,55m/min and 60m/min;
s004, cleaning the rolled PVC coiled material by a pure water tank, wherein the temperature of pure water in the pure water tank is controlled at 10 ℃, and NaOH with the concentration of 15g/L is added;
s005, after the PVC coiled material is cleaned, drying the PVC coiled material, and then cooling and shaping, wherein the drying temperature is 180 ℃, and the cooling and shaping temperature is 25 ℃;
s006. After cooling and shaping the PVC coiled material, coiling the PVC coiled material, and then placing the coiled PVC coiled material in a refrigerating chamber for refrigerating, wherein the refrigerating temperature is 8 ℃, and the refrigerating time is 2 hours.
In the step S001 of the comparative example, the plasticizer is dioctyl terephthalate; further, the PVC resin is 105 parts, the plasticizer is 60 parts, and the calcium-zinc composite stabilizer is 2 parts by weight.
The present comparative example also provides a PVC coil made from the method of making the PVC coil provided by the present comparative example.
The performance test items of examples 1-2 and comparative examples 1-6 are as follows:
transmittance: according to ISO 13468-2:2021 double bundle instrument: transparent total light transmittance materials-determination of plastics of part 2 "the PVC rolls prepared in examples 1-2 and comparative examples 1-6, respectively, were tested for light transmittance to characterize the transparency of the samples.
Impact strength: according to GB/T9639.1-2008 "free dart method for impact resistance test of Plastic film and sheet 1 st part: the PVC coiled materials prepared in examples 1-2 and comparative examples 1-6 were tested for impact strength according to the Standard of the Cascade method, respectively.
The results of the performance tests are shown in the following table:
| film thickness | Transmittance of light | Impact Strength (J/m) 2) | |
| Example 1 | 1.2mm | 90% | 8.9 |
| Example 2 | 1.2mm | 92% | 9.9 |
| Comparative example 1 | 1.2mm | 80% | 7.2 |
| Comparative example 2 | 1.2mm | 80% | 8.8 |
| Comparative example 3 | 1.3mm | 80% | 8.0 |
| Comparative example 4 | 1.2mm | 82% | 8.5 |
| Comparative example 5 | 1.3mm | 75% | 8.2 |
| Comparative example 6 | 1.2mm | 78% | 8.7 |
From the above test results, it can be seen that the polymerization degree of the PVC resin used in comparative example 1 is lower than that of the PVC resin used in examples 1-2, and accordingly, the transmittance and impact strength of the obtained PVC coiled material are not as high as those of the PVC coiled material obtained in examples 1-2; the transmittance of the PVC coiled material prepared in comparative example 2 is lower than that of examples 1-2, which shows that the transmittance of the PVC coiled material can be improved by cleaning the calendered PVC coiled material in examples 1-2 with pure water containing NaOH; the PVC resins with higher polymerization degree are used in the comparative examples 3-4, but in the six-roller calendering process, the temperature of the six rollers is lower than 215 ℃, the PVC resins with high polymerization degree cannot be fully plasticized, the plasticizing effect is poor, and correspondingly, the light transmittance and the impact strength of the PVC coiled materials prepared in the comparative examples 3-4 are lower than those of the examples 1-2; comparative example 5 since the calendered PVC coil was not washed with pure water containing NaOH, the transmittance of the PVC coil prepared in comparative example 5 was low and the transparency was poor as compared to comparative example 3; the transmittance of the PVC coil obtained in comparative example 6 was significantly lower than that of the PVC coils obtained in examples 1-2, indicating that the cleaning of the PVC coil with pure water at a lower temperature did not improve the transparency of the PVC coil.
In summary, according to the invention, the PVC film is washed by pure water added with NaOH after the PVC film is calendered and molded by using the high-K PVC resin as the raw material for producing PVC coiled materials such as PVC films, so that the PVC film has high transparency, and the light transmittance is more than 90 percent, and compared with a mode of improving the transparency of the PVC film by using the rare earth composite stabilizer, the PVC film has lower cost. According to the invention, the PVC film is rolled by the six-roller calender, and the temperature of six-roller delay is strictly controlled, so that the PVC film with the thickness of 1.2mm and more than 1.2mm can be obtained by one-time rolling molding, the preparation procedures of PVC coiled materials such as the PVC film can be reduced, the production efficiency can be improved, and the transparency and the impact resistance of the PVC film obtained by rolling molding are ensured to be high.
It will be understood that equivalents and modifications will occur to those skilled in the art in light of the present invention and their spirit, and all such modifications and substitutions are intended to be included within the scope of the present invention as defined in the following claims.
Claims (9)
1. The preparation method of the transparent impact-resistant PVC coiled material is characterized by comprising the following steps of:
s001, feeding the mixed plasticizer, the calcium-zinc composite stabilizer and the PVC resin with the K value of 1750 to 1800 into a planetary extruder for preplasticizing;
s002, after pre-plasticizing by the planetary extruder, conveying the sizing material into a filtering extruder for secondary plasticizing;
s003, feeding the sizing material extruded by the filtering extruder into a six-roller calender, and calendering the sizing material into PVC coiled materials by the six-roller calender, wherein the temperature of the six rollers is 215-220 ℃;
s004, cleaning the rolled PVC coiled material by a pure water tank, wherein NaOH is added into the pure water tank, and the concentration of the NaOH is 10-15 g/L;
s005, after the PVC coiled material is cleaned, drying the PVC coiled material, and then cooling and shaping;
and S006. After cooling and shaping the PVC coiled material, coiling the PVC coiled material, and then placing the coiled PVC coiled material in a refrigerating chamber for refrigerating.
2. The method for preparing transparent impact-resistant PVC coiled material according to claim 1, wherein in the step S001, the extrusion temperature of the planetary extruder is 200-220 ℃, and the pre-plasticizing time is 3-4 min.
3. The method for preparing transparent impact resistant PVC coiled material according to claim 1, wherein in the step S002, the temperature of the filtering extruder is 110-130 ℃, 130-150 ℃, 150-155 ℃ and the secondary plasticizing time is 10-15 min.
4. The method for producing an impact-transparent PVC web according to claim 1, wherein in step S003, the rotation speed of the six rolls is set to be: 36-38 m/min, 39-41 m/min, 44-46 m/min, 48-50 m/min, 53-55 m/min and 60m/min.
5. The method for preparing transparent impact-resistant PVC coiled material according to claim 1, wherein in the step S004, the temperature of pure water in the pure water tank is controlled to be 40+/-2 ℃.
6. The method for preparing transparent impact-resistant PVC coiled material according to claim 1, wherein in the step S005, the drying temperature is 160-180 ℃, and the cooling and shaping temperature is 0-25 ℃.
7. The method for producing a transparent impact-resistant PVC coil material according to claim 1, wherein the plasticizer is dioctyl phthalate or dioctyl terephthalate.
8. The method for preparing transparent impact-resistant PVC coiled material according to claim 1, wherein in the step S001, the PVC resin is 95-105 parts by weight, the plasticizer is 50-60 parts by weight, and the calcium-zinc composite stabilizer is 1-2 parts by weight.
9. A transparent impact resistant PVC web made by the process of making a transparent impact resistant PVC web according to any one of claims 1 to 8.
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| CN103756197A (en) * | 2014-01-26 | 2014-04-30 | 东莞市悠悠美居家居制造有限公司 | High-definition transparent PVC (polyvinyl chloride) film and preparation method thereof |
| CN115124745A (en) * | 2022-06-30 | 2022-09-30 | 烟台泰和新材料股份有限公司 | Para-aramid film and preparation method thereof |
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| CN103756197A (en) * | 2014-01-26 | 2014-04-30 | 东莞市悠悠美居家居制造有限公司 | High-definition transparent PVC (polyvinyl chloride) film and preparation method thereof |
| CN115124745A (en) * | 2022-06-30 | 2022-09-30 | 烟台泰和新材料股份有限公司 | Para-aramid film and preparation method thereof |
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