CN115850752A - Preparation method of heat-resistant PVC packaging bag - Google Patents
Preparation method of heat-resistant PVC packaging bag Download PDFInfo
- Publication number
- CN115850752A CN115850752A CN202211548232.1A CN202211548232A CN115850752A CN 115850752 A CN115850752 A CN 115850752A CN 202211548232 A CN202211548232 A CN 202211548232A CN 115850752 A CN115850752 A CN 115850752A
- Authority
- CN
- China
- Prior art keywords
- pvc
- film
- packaging bag
- montmorillonite
- preparing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Images
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The invention discloses a preparation method of a heat-resistant PVC packaging bag, which comprises the following steps: the method comprises the following steps: preparing modified montmorillonite; step two: preparing a PVC mixture; step three: preparing a PVC packaging film; step four: preparing the PVC packaging bag. The invention has the beneficial effects that: the thermal stability of the PVC film can be improved, and the requirement on temperature in the production and use processes of the PVC film can be met; can avoid accelerating the decomposition rate of PVC resin, influence the performance of PVC film and PVC goods and can make each component mix more evenly, exert each effect in the PVC film more, strengthen the performance of PVC film and PVC goods.
Description
Technical Field
The invention belongs to the technical field of PVC materials, and particularly relates to a preparation method of a PVC packaging bag with high heat resistance.
Background
Polyvinyl chloride (PVC) is a thermoplastic high polymer formed by polymerizing vinyl chloride monomers and is one of five general resins in synthetic materials. The packaging bag is a bag for packaging various articles, so that goods are convenient to transport and easy to store in the production and circulation process, and the packaging bag is widely applied to daily life and industrial production. Among materials capable of producing three-dimensional surface films, PVC is the most suitable material, PVC packaging bags are soft and hard, can be bound according to requirements of customers, and have transparency according to requirements.
Although widely used, the thermal stability, impact resistance, aging resistance and the like of PVC can not widely meet the requirements of industrial application, and the application range of PVC materials is limited. For example, PVC articles have poor heat resistance due to their low Vicat softening temperature, and heat distortion and fusion at 70 ℃. During the processing, the PVC is also seriously degraded, starts to decompose at the temperature of more than 100 ℃, quickly decomposes at the temperature of more than 180 ℃, and violently decomposes at the temperature of more than 200 ℃ and turns black. When the PVC film is produced, the temperature needs to be strictly controlled, so that the components of the PVC film are not uniformly mixed, the respective functions of the components cannot be fully exerted, and the properties and functions of the PVC film and PVC products are influenced.
How to improve the heat resistance of the PVC film so as to use enough temperature in the production process to achieve uniform mixing of the components is the key point for researching PVC materials. The traditional mode adopts the decomposition temperature that adds the plasticizer and promotes PVC, along with the improvement of plasticizer quantity, PVC's decomposition temperature increases, but its performance can reduce, and traditional technology PVC production mixing temperature generally can only reach about 150 ℃, leads to each component can't thoroughly mix in the PVC goods, influences the performance of PVC goods, has also restricted PVC resin's application.
Disclosure of Invention
In order to overcome the technical problems, the invention provides a preparation method of a heat-resistant PVC packaging bag.
The technical problem to be solved by the invention is as follows:
PVC begins to decompose when the temperature is higher than 100 ℃, and violently decomposes and blackens when the temperature is higher than 200 ℃, so that more plasticizers and heat stabilizers are added in the heating process, and the heating temperature is limited to ensure the smooth operation of the heating forming process. And the components and materials in the PVC product can not be completely and uniformly mixed, and can not fully play respective functions, thereby affecting the properties and functions of the PVC product.
The purpose of the invention can be realized by the following technical scheme:
a preparation method of a heat-resistant PVC packaging bag comprises the following steps:
the method comprises the following steps: preparation of modified montmorillonite
Preparing modified montmorillonite from montmorillonite, polar solvent, silane coupling agent, stearic acid and nonpolar solvent; wherein the mass volume ratio of the montmorillonite to the polar solvent is 1:3 to 8; the mass ratio of the montmorillonite to the silane coupling agent is 1:2.5 to 4; the mass ratio of the montmorillonite to the stearic acid is 1:0.05 to 0.1; the volume ratio of the polar solvent to the non-polar solvent is 1:2;
step two: preparation of PVC mixture
Preparing PVC resin, phthalic acid ester, epoxidized soybean oil, diphenyl isooctyl phosphite, a lubricant and modified montmorillonite into a PVC packaging bag film; wherein the mass ratio of the PVC resin to the phthalic acid ester, the epoxidized soybean oil, the diphenyl-isooctyl phosphite, the lubricant wax and the modified montmorillonite is 100:40 to 45:5 to 10:1 to 3:0.3 to 0.5:1 to 3;
step three: preparation of PVC packaging film
Adding the PVC mixture into a granulator for granulation treatment to obtain PVC mixture particles, adding the PVC mixture particles into a film blowing machine for film blowing treatment, blowing out a film, and cooling the film to normal temperature to prepare a PVC packaging film;
step four: preparing PVC packaging bag
Installing the PVC packaging film and the printing roller on a printing machine, printing pictures and texts on the surface of a packaging bag product to prepare a printing film, screening to remove defective products, performing composite treatment on the defective product printing film by using a compound machine, curing, cooling, and adding into a bag making machine to prepare the PVC packaging bag.
Further, the preparation process of the modified montmorillonite in the step one is as follows: adding montmorillonite and polar solvent into a reaction bottle, heating to 30 ℃, rapidly stirring for 1 hour, performing ultrasonic treatment for 1.2 hours to uniformly disperse montmorillonite, adding silane coupling agent and stearic acid, heating to 40 ℃, and performing ultrasonic treatment for 2 hours; slowly stirring, slowly cooling to 10 ℃, dropwise adding a non-polar solvent, and stirring for 12 hours while keeping the temperature after dropwise adding to crystallize the modified montmorillonite; filtering, drying and crushing to obtain modified montmorillonite powder.
Further, the silane coupling agent in the step one is one or a mixture of two or more of vinyltriethoxysilane, vinyltrimethoxysilane and allyltrimethylsilane; the montmorillonite is of a natural lamellar structure.
Further, the polar solvent in the step one is one or a mixture of two or more of methanol, ethanol and isopropanol; the nonpolar solvent is one or more of n-hexane, n-heptane and n-octane; the rapid stirring speed is 800-1000 rpm; the slow stirring speed is 60-65 rpm.
Further, the preparation process of the PVC mixture in the step two is as follows: adding PVC resin and modified montmorillonite into a mixing stirrer for mixing for 20-30min, adding phthalate, epoxidized soybean oil, diphenyl isooctyl phosphite and lubricant, and continuously mixing for 15-20min; cooling for 1 hour; thus obtaining the PVC mixture.
Further, the mixing and stirring speed in the step two is 150-160 rpm; the mixing temperature is 100-110 ℃; the cooling temperature is 35-40 ℃.
Further, the phthalate in the second step is one or a mixture of two of dioctyl phthalate, diisooctyl phthalate and diisodecyl phthalate.
Further, the lubricant in the second step is one of liquid paraffin, solid paraffin and stearic acid.
Furthermore, the granulation treatment temperature in the third step is 190-200 ℃, and the film blowing treatment temperature is 140-145 ℃.
Further, the curing treatment temperature in the fourth step is 50-55 ℃, and the curing treatment time is 16 hours; the cooling treatment temperature is 20-25 ℃, and the cooling time is 30 minutes.
The invention has the beneficial effects that:
1. the montmorillonite is modified, and organic matters are inserted between montmorillonite layers, so that the montmorillonite layers are peeled off, the compatibility of the montmorillonite and PVC resin is increased, the thermal stability of the PVC film is improved through the excellent thermal barrier effect of the montmorillonite, and the requirement on temperature in the production and use processes of the PVC film is met.
2. In the modification process of the montmorillonite, polar solvents such as methanol and ethanol are used, the montmorillonite is quickly stirred and ultrasonically treated, so that the montmorillonite can be uniformly distributed in the methanol, and silane coupling agents such as vinyltriethoxysilane and vinyldimethoxysilane are used, so that the montmorillonite can be dissolved in the polar solvents such as the methanol and the ethanol and can be better inserted into the interlayer of the montmorillonite and the sheet layer of the glass montmorillonite. The modified montmorillonite can be crystallized better by slowly stirring and dropping non-polar solvents such as n-hexane and the like, and the yield of the modified montmorillonite is improved.
3. The modification of montmorillonite is carried out by adopting silane coupling agents such as vinyl triethoxysilane, vinyl dimethoxysilane and the like, and meanwhile, the properties of active groups such as vinyl, allyl and the like of montmorillonite can be utilized to carry out reaction with chlorine radicals in PVC resin in a certain proportion, so that the separation of chloride ions in the PVC resin can be reduced, and the stability of the PVC resin is improved. The modified montmorillonite is prepared by adopting the polar solvent and the nonpolar solvent, so that the problem that water is difficult to remove due to water treatment of the montmorillonite is avoided, and the problem that the decomposition rate of PVC resin is accelerated and the performances of a PVC film and a PVC product are influenced is avoided.
4. By using the modified montmorillonite, the use amount of the plasticizer can be reduced, the temperature in the production process of the PVC film can be increased to about 200 ℃ on the premise of using the same plasticizer, so that the components are mixed more uniformly, the functions of the components in the PVC film are exerted more, and the performances of the PVC film and the PVC product are enhanced.
Drawings
FIG. 1 is a flow chart of the preparation method of the present invention.
Detailed Description
In order to make the technical means, objectives and functions of the invention easy to understand, the invention will be further described with reference to the following embodiments.
Example 1:
the method comprises the following steps: preparation of modified montmorillonite
Adding 20Kg of montmorillonite and 100L of methanol into a reaction kettle, heating to 30 ℃, rapidly stirring (800 rpm) for 1 hour, performing ultrasonic treatment for 1.2 hours to uniformly disperse the montmorillonite, adding 60Kg of vinyltriethoxysilane and 1Kg of stearic acid, heating to 40 ℃, and performing ultrasonic treatment for 2 hours; slowly stirring (60 rpm), slowly cooling to 10 ℃, dropwise adding 200L of n-hexane, keeping the temperature and stirring for 12 hours after dropwise adding, and crystallizing the modified montmorillonite; centrifuging, drying and crushing to obtain modified montmorillonite powder.
Step two: preparation of PVC mixture
Adding 100 parts of PVC resin and 1.5 parts of modified montmorillonite into a mixing stirrer for mixing at the mixing speed of 150-160rpm and the mixing temperature of 100-110 ℃ for 20-30min, adding 40 parts of dioctyl phthalate, 5 parts of epoxidized soybean oil, 2 parts of diphenyl isooctyl phosphite and 0.5 part of liquid paraffin, and continuously mixing for 15-20min; cooling to 35-40 deg.c for 1 hr; thus obtaining the PVC mixture.
Step three: preparation of PVC packaging film
Adding the PVC mixture into a granulator for granulation treatment at the temperature of 190-200 ℃ to obtain PVC mixture particles, adding the PVC mixture particles into a film blowing machine for film blowing treatment at the temperature of 140-145 ℃, blowing out a film, and cooling the film to normal temperature to prepare the PVC packaging film.
Step four: preparing PVC packaging bag
Installing a PVC packaging film and a printing roller on a printing machine, printing and processing pictures and texts on the surface of a packaging bag product to prepare a printing film, screening and removing defective products, performing composite treatment on the defective product printing film by using a compound machine, and then performing curing treatment, wherein the curing treatment temperature is 50-55 ℃, and the curing treatment time is 16 hours; cooling treatment, wherein the cooling treatment temperature is 20-25 ℃, and the cooling time is 30 minutes; then adding a bag making machine to prepare the PVC packaging bag.
Example 2:
the method comprises the following steps: preparation of modified montmorillonite
Adding 20Kg of montmorillonite and 60L of ethanol into a reaction kettle, heating to 30 ℃, rapidly stirring (800 rpm) for 1 hour, performing ultrasonic treatment for 1.2 hours to uniformly disperse the montmorillonite, adding 50Kg of vinyltrimethoxysilane and 1.5Kg of stearic acid, heating to 40 ℃, and performing ultrasonic treatment for 2 hours; slowly stirring (60 rpm), slowly cooling to 10 ℃, dropwise adding 120L of n-hexane, keeping the temperature and stirring for 12 hours after dropwise adding, and crystallizing the modified montmorillonite; centrifuging, drying and crushing to obtain modified montmorillonite powder.
Step two: preparation of PVC mixture
Adding 100 parts of PVC resin and 3 parts of modified montmorillonite into a mixing stirrer for mixing at the mixing speed of 150-160rpm and the mixing temperature of 100-110 ℃ for 20-30min, adding 45 parts of diisooctyl phthalate, 8 parts of epoxidized soybean oil, 1 part of diphenyl isooctyl phosphite and 0.3 part of solid paraffin, and continuously mixing for 15-20min; cooling to 35-40 deg.c for 1 hr; thus obtaining the PVC mixture.
Step three: preparation of PVC packaging film
Adding the PVC mixture into a granulator for granulation treatment, wherein the granulation treatment temperature is 190-200 ℃ to obtain PVC mixture particles, adding the PVC mixture particles into a film blowing machine for film blowing treatment, wherein the film blowing treatment temperature is 140-145 ℃, blowing out a film, and cooling the film to normal temperature to prepare the PVC packaging film.
Step four: preparing PVC packaging bag
Installing a PVC packaging film and a printing roller on a printing machine, printing and processing pictures and texts on the surface of a packaging bag product to prepare a printing film, screening and removing defective products, performing composite treatment on the defective product printing film by using a compound machine, and then performing curing treatment, wherein the curing treatment temperature is 50-55 ℃, and the curing treatment time is 16 hours; cooling treatment, wherein the cooling treatment temperature is 20-25 ℃, and the cooling time is 30 minutes; then adding a bag making machine to prepare the PVC packaging bag.
Example 3:
the method comprises the following steps: preparation of modified montmorillonite
Adding 20Kg of montmorillonite and 160L of isopropanol into a reaction kettle, heating to 30 ℃, rapidly stirring (800 rpm) for 1 hour, performing ultrasonic treatment for 1.2 hours to uniformly disperse the montmorillonite, adding 80Kg of allyltrimethoxysilane and 2Kg of stearic acid, heating to 40 ℃, and performing ultrasonic treatment for 2 hours; slowly stirring (60 rpm), slowly cooling to 10 ℃, dropwise adding 320L of n-heptane, and stirring for 12 hours while keeping the temperature after dropwise adding to crystallize the modified montmorillonite; centrifuging, drying and crushing to obtain modified montmorillonite powder.
Step two: preparation of PVC mixture
Adding 100 parts of PVC resin and 3 parts of modified montmorillonite into a mixing stirrer for mixing at the mixing speed of 150-160rpm and the mixing temperature of 100-110 ℃ for 20-30min, adding 40 parts of diisodecyl phthalate, 10 parts of epoxidized soybean oil, 3 parts of diphenyl isooctyl phosphite and 0.5 part of stearic acid, and continuously mixing for 15-20min; cooling to 35-40 deg.c for 1 hr; and obtaining the PVC mixture.
Step three: preparation of PVC packaging film
Adding the PVC mixture into a granulator for granulation treatment at the temperature of 190-200 ℃ to obtain PVC mixture particles, adding the PVC mixture particles into a film blowing machine for film blowing treatment at the temperature of 140-145 ℃, blowing out a film, and cooling the film to normal temperature to prepare the PVC packaging film.
Step four: preparing PVC packaging bag
Installing a PVC packaging film and a printing roller on a printing machine, printing and processing pictures and texts on the surface of a packaging bag product to prepare a printing film, screening and removing defective products, performing composite treatment on the defective product printing film by using a compound machine, and then performing curing treatment, wherein the curing treatment temperature is 50-55 ℃, and the curing treatment time is 16 hours; cooling treatment, wherein the cooling treatment temperature is 20-25 ℃, and the cooling time is 30 minutes; then adding a bag making machine to prepare the PVC packaging bag.
Example 4:
the method comprises the following steps: preparation of modified montmorillonite
Adding 20Kg of montmorillonite and 120L of methanol into a reaction kettle, heating to 30 ℃, rapidly stirring (800 rpm) for 1 hour, performing ultrasonic treatment for 1.2 hours to uniformly disperse the montmorillonite, adding 40Kg of vinyltrimethoxysilane, 30Kg of vinyltriethoxysilane and 1.5Kg of stearic acid, heating to 40 ℃, and performing ultrasonic treatment for 2 hours; slowly stirring (60 rpm), slowly cooling to 10 ℃, dropwise adding 240L of n-octane, keeping the temperature and stirring for 12 hours after dropwise adding, and crystallizing the modified montmorillonite; centrifuging, drying and crushing to obtain modified montmorillonite powder.
Step two: preparation of PVC mixture
Adding 100 parts of PVC resin and 2 parts of modified montmorillonite into a mixing stirrer for mixing at the mixing speed of 150-160rpm and the mixing temperature of 100-110 ℃ for 20-30min, adding 42 parts of dioctyl phthalate, 5 parts of epoxidized soybean oil, 2.5 parts of diphenyl isooctyl phosphite and 0.4 part of liquid paraffin, and continuously mixing for 15-20min; cooling to 35-40 deg.c for 1 hr; thus obtaining the PVC mixture.
Step three: preparation of PVC packaging film
Adding the PVC mixture into a granulator for granulation treatment at the temperature of 190-200 ℃ to obtain PVC mixture particles, adding the PVC mixture particles into a film blowing machine for film blowing treatment at the temperature of 140-145 ℃, blowing out a film, and cooling the film to normal temperature to prepare the PVC packaging film.
Step four: preparing PVC packaging bag
Mounting a PVC packaging film and a printing roller on a printing machine, performing printing processing on pictures and texts on the surface of a packaging bag product to prepare a printing film, screening to remove defective products, performing composite treatment on the defective product printing film by using a compound machine, and performing curing treatment at the temperature of 50-55 ℃ for 16 hours; cooling treatment, wherein the cooling treatment temperature is 20-25 ℃, and the cooling time is 30 minutes; then adding a bag making machine to prepare the PVC packaging bag.
Example 5:
the method comprises the following steps: preparation of modified montmorillonite
Adding 20Kg of montmorillonite and 100L of ethanol into a reaction kettle, heating to 30 ℃, rapidly stirring (800 rpm) for 1 hour, performing ultrasonic treatment for 1.2 hours to uniformly disperse the montmorillonite, adding 55Kg of vinyltrimethoxysilane and 1Kg of stearic acid, heating to 40 ℃, and performing ultrasonic treatment for 2 hours; slowly stirring (60 rpm), slowly cooling to 10 ℃, dropwise adding 240L of n-octane, keeping the temperature and stirring for 12 hours after dropwise adding, and crystallizing the modified montmorillonite; centrifuging, drying and crushing to obtain modified montmorillonite powder.
Step two: preparation of PVC mixture
Adding 100 parts of PVC resin and 2.5 parts of modified montmorillonite into a mixing stirrer for mixing at the mixing speed of 150-160rpm and the mixing temperature of 100-110 ℃ for 20-30min, adding 20 parts of dioctyl phthalate, 20 parts of diisooctyl phthalate, 7 parts of epoxidized soybean oil, 2 parts of diphenyl-isooctyl phosphite and 0.5 part of liquid paraffin, and continuously mixing for 15-20min; cooling to 35-40 deg.c for 1 hr; thus obtaining the PVC mixture.
Step three: preparation of PVC packaging film
Adding the PVC mixture into a granulator for granulation treatment at the temperature of 190-200 ℃ to obtain PVC mixture particles, adding the PVC mixture particles into a film blowing machine for film blowing treatment at the temperature of 140-145 ℃, blowing out a film, and cooling the film to normal temperature to prepare the PVC packaging film.
Step four: preparing PVC packaging bag
Installing a PVC packaging film and a printing roller on a printing machine, printing and processing pictures and texts on the surface of a packaging bag product to prepare a printing film, screening and removing defective products, performing composite treatment on the defective product printing film by using a compound machine, and then performing curing treatment, wherein the curing treatment temperature is 50-55 ℃, and the curing treatment time is 16 hours; cooling treatment, wherein the cooling treatment temperature is 20-25 ℃, and the cooling time is 30 minutes; then adding a bag making machine to prepare the PVC packaging bag.
Example 6:
the method comprises the following steps: preparation of modified montmorillonite
Adding 20Kg of montmorillonite and 60L of ethanol into a reaction kettle, heating to 30 ℃, rapidly stirring (800 rpm) for 1 hour, performing ultrasonic treatment for 1.2 hours to uniformly disperse the montmorillonite, adding 50Kg of vinyltriethoxysilane and 1Kg of stearic acid, heating to 40 ℃, and performing ultrasonic treatment for 2 hours; slowly stirring (60 rpm), slowly cooling to 10 ℃, dropwise adding 120L of n-hexane, keeping the temperature and stirring for 12 hours after dropwise adding, and crystallizing the modified montmorillonite; centrifuging, drying and crushing to obtain modified montmorillonite powder.
Step two: preparation of PVC mixture
Adding 100 parts of PVC resin and 1 part of modified montmorillonite into a mixing stirrer for mixing at the mixing speed of 150-160rpm and the mixing temperature of 100-110 ℃ for 20-30min, adding 40 parts of diisodecyl phthalate, 5 parts of epoxidized soybean oil, 1 part of diphenyl isooctyl phosphite and 0.3 part of solid paraffin, and continuously mixing for 15-20min; cooling to 35-40 deg.c for 1 hr; thus obtaining the PVC mixture.
Step three: preparation of PVC packaging film
Adding the PVC mixture into a granulator for granulation treatment, wherein the granulation treatment temperature is 190-200 ℃ to obtain PVC mixture particles, adding the PVC mixture particles into a film blowing machine for film blowing treatment, wherein the film blowing treatment temperature is 140-145 ℃, blowing out a film, and cooling the film to normal temperature to prepare the PVC packaging film.
Step four: preparing PVC packaging bag
Installing a PVC packaging film and a printing roller on a printing machine, printing and processing pictures and texts on the surface of a packaging bag product to prepare a printing film, screening and removing defective products, performing composite treatment on the defective product printing film by using a compound machine, and then performing curing treatment, wherein the curing treatment temperature is 50-55 ℃, and the curing treatment time is 16 hours; cooling treatment, wherein the cooling treatment temperature is 20-25 ℃, and the cooling time is 30 minutes; then adding a bag making machine to prepare the PVC packaging bag.
Example 7:
the method comprises the following steps: preparation of modified montmorillonite
Adding 20Kg of montmorillonite and 160L of methanol into a reaction kettle, heating to 30 ℃, rapidly stirring (800 rpm) for 1 hour, performing ultrasonic treatment for 1.2 hours to uniformly disperse the montmorillonite, adding 80Kg of vinyltrimethoxysilane and 2Kg of stearic acid, heating to 40 ℃, and performing ultrasonic treatment for 2 hours; slowly stirring (60 rpm), slowly cooling to 10 ℃, dropwise adding 320L of n-hexane, keeping the temperature and stirring for 12 hours after dropwise adding, and crystallizing the modified montmorillonite; centrifuging, drying and crushing to obtain modified montmorillonite powder.
Step two: preparation of PVC mixture
Adding 100 parts of PVC resin and 3 parts of modified montmorillonite into a mixing stirrer for mixing at the mixing speed of 150-160rpm and the mixing temperature of 100-110 ℃ for 20-30min, adding 45 parts of diisodecyl phthalate, 10 parts of epoxidized soybean oil, 3 parts of diphenyl isooctyl phosphite and 0.5 part of liquid paraffin, and continuously mixing for 15-20min; cooling to 35-40 deg.c for 1 hr; and obtaining the PVC mixture.
Step three: preparation of PVC packaging film
Adding the PVC mixture into a granulator for granulation treatment, wherein the granulation treatment temperature is 190-200 ℃ to obtain PVC mixture particles, adding the PVC mixture particles into a film blowing machine for film blowing treatment, wherein the film blowing treatment temperature is 140-145 ℃, blowing out a film, and cooling the film to normal temperature to prepare the PVC packaging film.
Step four: preparing PVC packaging bag
Installing a PVC packaging film and a printing roller on a printing machine, printing and processing pictures and texts on the surface of a packaging bag product to prepare a printing film, screening and removing defective products, performing composite treatment on the defective product printing film by using a compound machine, and then performing curing treatment, wherein the curing treatment temperature is 50-55 ℃, and the curing treatment time is 16 hours; cooling treatment, wherein the cooling treatment temperature is 20-25 ℃, and the cooling time is 30 minutes; then adding a bag making machine to prepare the PVC packaging bag.
Comparative example 1: (unmodified montmorillonite was used as it is, and the remaining steps were the same as in example 1.)
The method comprises the following steps: preparation of PVC mixture
100 parts of PVC resin and 1.5 parts of montmorillonite are added into a mixing stirrer to be mixed, the mixing speed is 150-160rpm, the mixing temperature is 100-110 ℃, the mixing time is 20-30min, then 40 parts of dioctyl phthalate, 5 parts of epoxidized soybean oil, 2 parts of diphenyl isooctyl phosphite and 0.5 part of liquid paraffin are added, and the mixture is continuously mixed for 15-20min; cooling to 35-40 deg.c for 1 hr; thus obtaining the PVC mixture.
Step two: preparation of PVC packaging film
Adding the PVC mixture into a granulator for granulation treatment at the temperature of 190-200 ℃ to obtain PVC mixture particles, adding the PVC mixture particles into a film blowing machine for film blowing treatment at the temperature of 140-145 ℃, blowing out a film, and cooling the film to normal temperature to prepare the PVC packaging film.
Step three: preparing PVC packaging bag
Installing a PVC packaging film and a printing roller on a printing machine, printing and processing pictures and texts on the surface of a packaging bag product to prepare a printing film, screening and removing defective products, performing composite treatment on the defective product printing film by using a compound machine, and then performing curing treatment, wherein the curing treatment temperature is 50-55 ℃, and the curing treatment time is 16 hours; cooling treatment, wherein the cooling treatment temperature is 20-25 ℃, and the cooling time is 30 minutes; then adding a bag making machine to prepare the PVC packaging bag.
Comparative example 2: (the amount of the heat stabilizer was increased by 1 time without using montmorillonite, and the remaining procedure was the same as in example 1.)
The method comprises the following steps: preparation of PVC mixture
Adding 100 parts of PVC resin, 40 parts of dioctyl phthalate, 5 parts of epoxidized soybean oil, 4 parts of diphenyl isooctyl phosphite and 0.5 part of liquid paraffin into a mixing stirrer for mixing, wherein the mixing speed is 150-160rpm, and the mixing temperature is 100-110 ℃; cooling to 35-40 deg.c for 1 hr; thus obtaining the PVC mixture.
Step two: preparation of PVC packaging film
Adding the PVC mixture into a granulator for granulation treatment at the temperature of 190-200 ℃ to obtain PVC mixture particles, adding the PVC mixture particles into a film blowing machine for film blowing treatment at the temperature of 140-145 ℃, blowing out a film, and cooling the film to normal temperature to prepare the PVC packaging film.
Step three: preparing PVC packaging bag
Installing a PVC packaging film and a printing roller on a printing machine, printing and processing pictures and texts on the surface of a packaging bag product to prepare a printing film, screening and removing defective products, performing composite treatment on the defective product printing film by using a compound machine, and then performing curing treatment, wherein the curing treatment temperature is 50-55 ℃, and the curing treatment time is 16 hours; cooling treatment, wherein the cooling treatment temperature is 20-25 ℃, and the cooling time is 30 minutes; then adding a bag making machine to prepare the PVC packaging bag.
Comparative example 3: (granulation temperature was reduced to 160 to 165 ℃ without using montmorillonite; the remaining steps were the same as in comparative example 2)
The method comprises the following steps: preparation of PVC mixture
Adding 100 parts of PVC resin, 40 parts of dioctyl phthalate, 5 parts of epoxidized soybean oil, 4 parts of diphenyl isooctyl phosphite and 0.5 part of liquid paraffin into a mixing stirrer for mixing, wherein the mixing speed is 150-160rpm, and the mixing temperature is 100-110 ℃; cooling to 35-40 deg.c for 1 hr; thus obtaining the PVC mixture.
Step two: preparation of PVC packaging film
Adding the PVC mixture into a granulator for granulation treatment, wherein the granulation treatment temperature is 160-165 ℃ to obtain PVC mixture particles, adding the PVC mixture particles into a film blowing machine for film blowing treatment, wherein the film blowing treatment temperature is 140-145 ℃, blowing out a film, and cooling the film to normal temperature to prepare the PVC packaging film.
Step three: preparing PVC packaging bag
Installing a PVC packaging film and a printing roller on a printing machine, printing and processing pictures and texts on the surface of a packaging bag product to prepare a printing film, screening and removing defective products, performing composite treatment on the defective product printing film by using a compound machine, and then performing curing treatment, wherein the curing treatment temperature is 50-55 ℃, and the curing treatment time is 16 hours; cooling treatment, wherein the cooling treatment temperature is 20-25 ℃, and the cooling time is 30 minutes; then adding a bag making machine to prepare the PVC packaging bag.
The following figures compare the PVC packages obtained in the examples and comparative examples:
note: the time for heat resistance stability at 60 ℃ and 90 ℃ is the time from the time when the PVC product is placed in the incubator to the time when the weight of the PVC product is lost 15%.
As can be seen from the comparison of the above embodiment and the comparative example, the montmorillonite subjected to modification treatment can effectively improve the heat-resistant effect of the PVC product in the production process, can improve the temperature in the production process, enables the components to be more fully and uniformly fused, exerts respective effects and improves the performance of the PVC product.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The preparation method of the heat-resistant PVC packaging bag is characterized by comprising the following steps:
the method comprises the following steps: preparation of modified montmorillonite
Preparing modified montmorillonite from montmorillonite, polar solvent, silane coupling agent, stearic acid and nonpolar solvent; wherein the mass volume ratio of the montmorillonite to the polar solvent is 1:3 to 8 percent; the mass ratio of the montmorillonite to the silane coupling agent is 1:2.5 to 4; the mass ratio of the montmorillonite to the stearic acid is 1:0.05 to 0.1; the volume ratio of the polar solvent to the non-polar solvent is 1:2;
step two: preparation of PVC mixture
Preparing PVC resin, phthalic acid ester, epoxidized soybean oil, diphenyl isooctyl phosphite, a lubricant and modified montmorillonite into a PVC packaging bag film; wherein the mass ratio of the PVC resin to the phthalic acid ester, the epoxidized soybean oil, the diphenyl-isooctyl phosphite, the lubricant wax and the modified montmorillonite is 100:40 to 45:5 to 10:1 to 3:0.3 to 0.5:1 to 3;
step three: preparation of PVC packaging film
Adding the PVC mixture into a granulator for granulation treatment to obtain PVC mixture particles, adding the PVC mixture particles into a film blowing machine for film blowing treatment, blowing out a film, and cooling the film to normal temperature to prepare a PVC packaging film;
step four: preparing PVC packaging bag
Installing the PVC packaging film and the printing roller on a printing machine, printing pictures and texts on the surface of a packaging bag product to prepare a printing film, screening to remove defective products, performing composite treatment on the defective product printing film by using a compound machine, curing, cooling, and adding into a bag making machine to prepare the PVC packaging bag.
2. The method for preparing a heat-resistant PVC packaging bag according to claim 1, characterized in that: the preparation process of the modified montmorillonite in the first step is as follows: adding montmorillonite and polar solvent into a reaction bottle, heating to 30 ℃, rapidly stirring for 1 hour, performing ultrasonic treatment for 1.2 hours to uniformly disperse the montmorillonite, adding a silane coupling agent and stearic acid, heating to 40 ℃, and performing ultrasonic treatment for 2 hours; slowly stirring, slowly cooling to 10 ℃, dropwise adding a non-polar solvent, and stirring for 12 hours while keeping the temperature after dropwise adding to crystallize the modified montmorillonite; filtering, drying and crushing to obtain modified montmorillonite powder.
3. The method for preparing a heat-resistant PVC packaging bag according to claim 2, wherein: the silane coupling agent is one or a mixture of two or more of vinyl triethoxysilane, vinyl trimethoxysilane and allyl trimethylsilane; the montmorillonite is of a natural lamellar structure.
4. The method for preparing a heat-resistant PVC packaging bag according to claim 2 or 3, wherein: the polar solvent is one or a mixture of two or more of methanol, ethanol and isopropanol; the nonpolar solvent is one or more of n-hexane, n-heptane and n-octane; the rapid stirring speed is 800-1000 rpm; the slow stirring speed is 60-65 rpm.
5. The method for preparing a heat-resistant PVC packaging bag according to claim 1, characterized in that: the preparation process of the PVC mixture in the step two is as follows: adding PVC resin and modified montmorillonite into a mixing stirrer for mixing for 20-30min, adding phthalate, epoxidized soybean oil, diphenyl isooctyl phosphite and lubricant, and continuously mixing for 15-20min; cooling for 1 hour; thus obtaining the PVC mixture.
6. The method for preparing a heat-resistant PVC packaging bag according to claim 5, wherein: the mixing and stirring speed is 150-160 rpm; the mixing temperature is 100-110 ℃; the cooling temperature is 35-40 ℃.
7. The method for preparing a heat-resistant PVC packaging bag according to claim 5 or 6, wherein: the phthalate is one or a mixture of two of dioctyl phthalate, diisooctyl phthalate and diisodecyl phthalate.
8. The method for preparing a heat-resistant PVC packaging bag according to claim 7, wherein the method comprises the following steps: the lubricant is one of liquid paraffin, solid paraffin and stearic acid.
9. The method for preparing a heat-resistant PVC packaging bag according to claim 1, characterized in that: the granulation treatment temperature in the third step is 190-200 ℃, and the film blowing treatment temperature is 140-145 ℃.
10. The method for preparing a heat-resistant PVC packaging bag according to claim 1 or 9, wherein: the curing treatment temperature in the fourth step is 50-55 ℃, and the curing treatment time is 16 hours; the cooling treatment temperature is 20-25 ℃, and the cooling time is 30 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211548232.1A CN115850752A (en) | 2022-12-05 | 2022-12-05 | Preparation method of heat-resistant PVC packaging bag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211548232.1A CN115850752A (en) | 2022-12-05 | 2022-12-05 | Preparation method of heat-resistant PVC packaging bag |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115850752A true CN115850752A (en) | 2023-03-28 |
Family
ID=85669831
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211548232.1A Withdrawn CN115850752A (en) | 2022-12-05 | 2022-12-05 | Preparation method of heat-resistant PVC packaging bag |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115850752A (en) |
-
2022
- 2022-12-05 CN CN202211548232.1A patent/CN115850752A/en not_active Withdrawn
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE69223384T2 (en) | Polyphenylene ether resins modified with silicone rubber powder | |
| CN109735076B (en) | Preparation method of high-performance bio-based/polylactic acid fully-degradable material | |
| CN110358299B (en) | Hybrid modified silicone rubber and preparation method and application thereof | |
| CN113024736A (en) | Ionic antistatic polyethylene graft and preparation method thereof | |
| CN115340724A (en) | Starch-based antibacterial material and preparation method thereof | |
| CN112175304A (en) | POSS (polyhedral oligomeric silsesquioxane) modified ethylene propylene diene monomer composite material with reaction type cage-type silsesquioxane structure and preparation method thereof | |
| CN111253727A (en) | Composite material for preparing high-strength carrier tape | |
| CN107523049A (en) | A kind of graphene macromolecule composite heat-conducting plastics and preparation method | |
| CN108129767B (en) | Graphene oxide reinforced PVC/ABS composite pipe and preparation method thereof | |
| CN107739489A (en) | The preparation method of the CPVC blend compositions of high thermal stability | |
| CN107603058B (en) | A kind of PVC/CPE composite pipes and preparation method thereof of graphene oxide enhancing | |
| CN115850752A (en) | Preparation method of heat-resistant PVC packaging bag | |
| CN1064583C (en) | Dispersive reactive entrusion of polymer gels | |
| CN111875887A (en) | Antistatic polypropylene plastic and preparation method thereof | |
| CN113930003B (en) | MPPO material, mineral filled master batch and preparation method thereof | |
| CN114702799A (en) | Biodegradable polylactic acid plastic uptake sheet | |
| CN110734631B (en) | Lignin-based biodegradable polybutylene succinate film and preparation method thereof | |
| CN115320201A (en) | Multilayer high-barrier and high-strength biodegradable film and preparation method thereof | |
| CN111333991B (en) | High-temperature-resistant composite packaging film and preparation method thereof | |
| CN109161177B (en) | Polymethyl ethylene carbonate based high-barrier material and preparation method thereof | |
| CN106987026B (en) | A kind of modified calcium carbonate and preparation method thereof, application | |
| CN111978599A (en) | Heat-resistant starch-degradable plastic improved by silica sol and preparation method thereof | |
| CN110305453A (en) | A kind of resistance to PBT 3D printing wire rod and preparation method thereof for shrinking warpage | |
| CN114316105B (en) | Method for removing coating film in PVC (polyvinyl chloride) by suspension method | |
| KR102644448B1 (en) | Manufacturing method of epdm with polar group amd epdm with polar group using the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20230328 |
|
| WW01 | Invention patent application withdrawn after publication |