CN115056460A - Preparation process of PVA (polyvinyl alcohol) laundry bag for hospital - Google Patents
Preparation process of PVA (polyvinyl alcohol) laundry bag for hospital Download PDFInfo
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- CN115056460A CN115056460A CN202110954410.XA CN202110954410A CN115056460A CN 115056460 A CN115056460 A CN 115056460A CN 202110954410 A CN202110954410 A CN 202110954410A CN 115056460 A CN115056460 A CN 115056460A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/08—Biaxial stretching during blow-moulding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/64—Heating or cooling preforms, parisons or blown articles
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L29/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical; Compositions of hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Compositions of derivatives of such polymers
- C08L29/02—Homopolymers or copolymers of unsaturated alcohols
- C08L29/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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- Chemical Kinetics & Catalysis (AREA)
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Abstract
The invention discloses a preparation process of a PVA (polyvinyl alcohol) laundry bag for hospitals, which comprises the following steps of 1) adding water into a mixing kettle, then adding raw materials, and heating for reaction to obtain a mixture; (2) putting the mixture into an extruder for granulation to obtain polymer particles, (3) putting the polymer particles into the extruder for film blowing, and (4) processing the film into bags and ropes; (5) finally, the rope is thermally adhered to the bag through a heat sealing machine, and a finished product is packaged; the raw materials comprise: PVA, starch and an auxiliary material, wherein the alcoholysis degree of the PVA is 88%, the content of the PVA is 60-90 wt%, and the auxiliary material is: the PVA film comprises a solvent, a lubricant, a plant extract and a hydroxyl compound, wherein the plant extract is preferably a lotus leaf extract, can be used as a coloring agent and can improve the water resistance of the PVA film. The PVA laundry bag obtained by the invention has good elongation at break and a certain degree of low-temperature water resistance, and can be widely used as a hospital laundry bag to avoid cross infection.
Description
Technical Field
The invention relates to the technical field of PVA film preparation, B29D7/01, and particularly relates to a preparation process of a PVA hospital laundry bag.
Background
The hospital hygiene and epidemic prevention work requirements are strict, and various medical instruments and daily supplies are strictly disinfected to prevent cross infection. The hospital doctor nurse's work clothes, patient's gown all need wash after using and disinfect the back and just can reuse, and these clothes are transported appointed laundry center and carry out unified cleaning process after ordinary plastic bag classification dress usually. After the clothes are taken out, the plastic bag is treated as medical waste, the treatment cost is high, and the risk of environmental pollution exists. The PVA medical bag has hydrophilicity and can be washed together with clothes, thereby avoiding cross infection of bacteria and viruses.
Polyvinyl alcohol (PVA) is a water-soluble polymer with a main molecular chain of carbon chains and a large number of hydroxyl groups on side chains. The film prepared by PVA is nontoxic and tasteless, has high transparency, does not absorb dust, has good mechanical properties, has the outstanding characteristics of complete biodegradation and good water solubility, meets the requirement of green environmental development and is suitable for various packaging bags or sealing bags (CN 201610537537.0). However, PVA can be decomposed at different water temperatures, and a low-temperature water-soluble PVA composition filled with starch is provided in the patent with the application number of CN202010250318.0, so that the problem that PVA raw materials are easy to decompose and carbonize in the thermoplastic processing process is solved, and the thermoplastic processing of PVA is realized. In patent application No. CN201810719164.8, the water resistance of PVA film is improved by mixing quercetin nanocrystals with PVA, but when the low temperature water resistance of PVA film is too high, it cannot be used in medical laundry bags.
Disclosure of Invention
In order to solve the problem of low-temperature water solubility of the medical washing bag, the invention provides a preparation process of a PVA (polyvinyl alcohol) washing bag for a hospital. The using method comprises the following steps:
(1) adding water into a mixing kettle, then adding the raw materials, heating to 60-90 ℃ for 20-60min, and reacting to obtain a mixture;
(2) placing the mixture into an extruder for granulation to obtain polymer particles, and sequentially controlling the temperature range from a feed opening to a discharge opening to be 100-;
(3) the polymer particles are put into an extruder and blown within the temperature range of 180-220 ℃, and the temperature range from a feed opening to a discharge die head opening is controlled to be 100-220 ℃, 180-220 ℃ and 180-220 ℃;
(4) processing the film into bags and ropes;
(5) finally, the rope is thermally bonded on the bag through a heat sealing machine, the heat sealing temperature is 180-; and packaging the finished product.
As a preferred embodiment, the raw materials consist of: PVA, starch and auxiliary materials.
In a preferred embodiment, the PVA has a polymerization degree of 1700 and an alcoholysis degree of 88%
As a preferred embodiment, the PVA accounts for 60 to 90 wt%, preferably 75 wt%, of the total raw material mass.
As a preferred embodiment, the starch is selected from one or more of corn starch, potato starch, tapioca starch, wheat starch, mixed bean starch; preferably corn starch, potato starch, wheat starch.
As a preferred embodiment, the mass of the starch accounts for 1-40 wt% of the total raw material mass; preferably 20 wt%.
As a preferred embodiment, the auxiliary material is: solvent, lubricant, plant extract, and hydroxyl compound.
As a preferred embodiment, the solvent is selected from one or more of water, ethanol, diethyl ether, acetone, chloroform, tetrahydrofuran.
As a preferred embodiment, the lubricant is selected from one or more of paraffin wax, oxidized polyethylene wax, calcium stearate, and glyceryl stearate.
As a preferred embodiment, the plant extract is selected from one or more of marigold extract, turmeric extract, lotus leaf extract; preferably a lotus leaf extract.
As a preferred embodiment, the hydroxyl compound is selected from one or more of polyethylene glycol, glycerol, propylene glycol, triethanolamine.
As a preferred embodiment, the mass of the auxiliary material accounts for 1-10 wt% of the total raw material mass; preferably 5 wt%.
Compared with the prior art, the invention has the following beneficial effects:
(1) the main component of the laundry bag in the application is PVA with alcoholysis degree of 88%. PVA has the performance and the characteristic of the traditional plastic, can be split and degraded in water with different water temperatures or under natural conditions, and finally returns to the natural environment in the form of carbon dioxide and water, thus being an excellent biodegradable plastic. The applicant has found that a PVA with an alcoholysis degree of 88% or less can be completely dissolved at 25 ℃ and normal temperature, whereas a PVA with an alcoholysis degree of 98% needs to be dissolved under heating at 80 ℃ or higher. The PVA with alcoholysis degree of 88% can be used for fully dissolving the medical washing bag with the patient clothes at normal temperature after entering a washing machine, so that the environmental pollution caused by medical waste is avoided, and the PVA has excellent biocompatibility and can not generate toxic or side effect on clothes.
(2) The filler of the laundry bag in this application is mainly corn starch. The corn starch has wide source, low price and good film forming property, can form a transparent film after being gelatinized and dried, and the film prepared from the starch is edible, biodegradable, colorless, tasteless and transparent, has excellent oxygen resistance, and can be used for biodegradable packaging materials. The corn starch is added into a PVA system, the hydroxyl in the corn starch and the hydroxyl of the polyvinyl alcohol generate interaction, intermolecular and intramolecular hydrogen bonds are formed, the intramolecular and intermolecular hydrogen bonds of the polyvinyl alcohol are replaced, the dissolving temperature of the PVA is improved, the problem that the alcoholysis type PVA raw material is easy to decompose and carbonize in the thermoplastic processing process is further solved, the thermoplastic processing of the PVA is realized, meanwhile, the environment-friendly performance of the PVA material is improved, and the degradation rate of the PVA is accelerated.
(3) The washing bag can be used as a plant coloring agent by adding the plant extract, is safe and environment-friendly, and enables the appearance of the washing bag to be attractive; the applicant finds that the water resistance of the PVA medical washing bag can be improved by selecting the lotus leaf extract; presumably, the lotus leaf extract contains quercetin, and the water resistance of the PVA film can be improved by preparing a film after the quercetin is mixed with the PVA; the quercetin can also be used as an antibacterial agent, and the washing bag can have an antibacterial effect by adding the quercetin, so that the virus infection risk of workers is reduced.
(4) In the present invention, tetrahydrofuran is used as the limiting solvent. The water solubility of the lotus leaf extract is not good, and when the solvent is selected to be tetrahydrofuran, on one hand, the lotus leaf extract can be better dissolved, the dyeing is uniform, and the dyeing effect is good; on the other hand, tetrahydrofuran is easy to volatilize, no residue is left in the washing bag, and the safety performance of the washing bag is ensured.
(5) The invention utilizes a blow molding film forming method to prepare the PVA medical laundry bag. The blow molding film forming method is a method for forming the thermoplastic plastic film, has the characteristics of small investment, high productivity, low energy consumption and the like compared with the solution casting film forming method, has small floor area, can reduce the production cost, and is beneficial to the industrial production of PVA thermoplastic film forming.
(6) The elongation at break of the PVA laundry bag can reach 500%.
Example 1
Embodiment 1 a preparation technology of a PVA laundry bag for hospital mainly comprises:
(1) adding water into a mixing kettle, then adding the raw materials, heating to 80 ℃ for 40min, and reacting to obtain a mixture;
(2) placing the mixture into an extruder for granulation to obtain polymer particles, and sequentially controlling the temperature interval from a feed opening to a discharge opening to be 110 ℃, 190 ℃, 200 ℃, 180 ℃ and 170 ℃;
(3) putting polymer particles into an extruder, blowing a film at the temperature of 200 ℃, and sequentially controlling the temperature range from a feed opening to a discharge die head opening to be 120 ℃, 210 ℃, 200 ℃, 190 ℃ and 180 ℃;
(4) processing the film into bags and ropes;
(5) finally, the rope is thermally bonded on the bag through a heat sealing machine, the heat sealing temperature is 190 ℃, and the time is 2 s; and packaging the finished product.
In the step (1), the raw materials comprise: PVA, starch and auxiliary materials;
the polymerization degree of the PVA is 1700, the alcoholysis degree of the PVA is 88 percent, and the mass of the PVA accounts for 75wt percent of the total mass of the raw materials (Xin chemical Co., Ltd.);
the starch is corn starch, and the mass of the starch accounts for 20 wt% of the total mass of the raw materials;
the auxiliary materials are as follows: solvents, lubricants, plant extracts, hydroxy compounds;
the solvent is water and tetrahydrofuran, and the volume ratio is 3: 7;
the lubricant is glyceryl stearate and paraffin, and the mass ratio of the glyceryl stearate to the paraffin is 1: 1;
the plant extract is a lotus leaf extract;
the hydroxy compound is glycerol (CAS: 56-81-5, Aladdin reagent, Inc.);
the mass of the auxiliary material accounts for 5 wt% of the total mass of the raw materials, wherein the mass of the lubricant accounts for 5 wt% of the total mass of the auxiliary material, the mass of the lotus leaf extract accounts for 10 wt% of the total mass of the auxiliary material, the mass of the hydroxyl compound accounts for 3 wt% of the total mass of the auxiliary material, and the balance is the mass of the solvent.
Example 2
A preparation process of a PVA (polyvinyl acetate) laundry bag for hospitals mainly comprises the following steps:
(1) adding water into a mixing kettle, then adding the raw materials, heating to 80 ℃ for 40min, and reacting to obtain a mixture;
(2) granulating the mixture in an extruder to obtain polymer particles, and sequentially controlling the temperature range from a feed opening to a discharge opening to be 110 ℃, 190 ℃, 200 ℃, 180 ℃ and 170 ℃;
(3) putting polymer particles into an extruder, blowing a film at the temperature of 200 ℃, and sequentially controlling the temperature range from a feed opening to a discharge die head opening to be 120 ℃, 210 ℃, 200 ℃, 190 ℃ and 180 ℃;
(4) processing the film into bags and ropes;
(5) finally, the rope is thermally bonded on the bag through a heat sealing machine, the heat sealing temperature is 190 ℃, and the time is 2 s; and packaging the finished product.
In the step (1), the raw materials comprise: PVA, starch and auxiliary materials;
the polymerization degree of the PVA is 1700, the alcoholysis degree of the PVA is 88 percent, and the mass of the PVA accounts for 65wt percent of the total mass of the raw materials;
the starch is corn starch, and the mass of the starch accounts for 30 wt% of the total mass of the raw materials;
the auxiliary materials are as follows: solvents, lubricants, plant extracts, hydroxy compounds;
the solvent is water and tetrahydrofuran, and the volume ratio is 3: 7;
the lubricant is glyceryl stearate and paraffin, and the mass ratio of the glyceryl stearate to the paraffin is 1: 1;
the plant extract is a lotus leaf extract;
the hydroxyl compound is glycerol;
the mass of the auxiliary material accounts for 5 wt% of the total mass of the raw materials, wherein the mass of the lubricant accounts for 5 wt% of the total mass of the auxiliary material, the mass of the lotus leaf extract accounts for 10 wt% of the total mass of the auxiliary material, the mass of the hydroxyl compound accounts for 3 wt% of the total mass of the auxiliary material, and the balance is the mass of the solvent.
Comparative example 1
A preparation process of a PVA (polyvinyl acetate) laundry bag for hospitals mainly comprises the following steps:
(1) adding water into a mixing kettle, then adding the raw materials, heating to 80 ℃ for 40min, and reacting to obtain a mixture;
(2) granulating the mixture in an extruder to obtain polymer particles, and sequentially controlling the temperature range from a feed opening to a discharge opening to be 110 ℃, 190 ℃, 200 ℃, 180 ℃ and 170 ℃;
(3) putting polymer particles into an extruder, blowing a film at the temperature of 200 ℃, and sequentially controlling the temperature range from a feed opening to a discharge die head opening to be 120 ℃, 210 ℃, 200 ℃, 190 ℃ and 180 ℃;
(4) processing the film into bags and ropes;
(5) finally, the rope is thermally bonded on the bag through a heat sealing machine, the heat sealing temperature is 190 ℃, and the time is 2 s; and packaging the finished product.
In the step (1), the raw materials comprise: PVA, starch and auxiliary materials;
the polymerization degree of the PVA is 1700, the alcoholysis degree of the PVA is 88 percent, and the mass of the PVA accounts for 75wt percent of the total mass of the raw materials;
the starch is corn starch, and the mass of the starch accounts for 20 wt% of the total mass of the raw materials;
the auxiliary materials are as follows: solvents, lubricants, plant coloring agents;
the solvent is water;
the lubricant is glyceryl stearate and paraffin, and the mass ratio of the glyceryl stearate to the paraffin is 1: 1;
the plant extract is a lotus leaf extract;
the mass of the auxiliary material accounts for 5 wt% of the total mass of the raw materials, the mass of the lubricant accounts for 5 wt% of the total mass of the auxiliary material, the mass of the lotus leaf extract accounts for 10 wt% of the total mass of the auxiliary material, and the balance is the mass of the solvent.
Comparative example 2
A preparation process of a PVA (polyvinyl acetate) laundry bag for hospitals mainly comprises the following steps:
(1) adding water into a mixing kettle, then adding the raw materials, heating to 80 ℃ for 40min, and reacting to obtain a mixture;
(2) granulating the mixture in an extruder to obtain polymer particles, and sequentially controlling the temperature range from a feed opening to a discharge opening to be 110 ℃, 190 ℃, 200 ℃, 180 ℃ and 170 ℃;
(3) putting polymer particles into an extruder, blowing a film at the temperature of 200 ℃, and sequentially controlling the temperature range from a feed opening to a discharge die head opening to be 120 ℃, 210 ℃, 200 ℃, 190 ℃ and 180 ℃;
(4) processing the film into bags and ropes;
(5) finally, the rope is thermally bonded on the bag through a heat sealing machine, the heat sealing temperature is 190 ℃, and the time is 2 s; and packaging the finished product.
In the step (1), the raw materials comprise: PVA, auxiliary material;
the polymerization degree of the PVA is 1700, the alcoholysis degree of the PVA is 88 percent, and the mass of the PVA accounts for 95 weight percent of the total mass of the raw materials;
the auxiliary materials are as follows: solvents, lubricants, plant extracts, hydroxy compounds;
the solvent is water and tetrahydrofuran, and the volume ratio is 3: 7;
the lubricant is glyceryl stearate and paraffin, and the mass ratio of the glyceryl stearate to the paraffin is 1: 1;
the plant extract is a lotus leaf extract;
the hydroxyl compound is glycerol;
the mass of the auxiliary material accounts for 5 wt% of the total mass of the raw materials, wherein the mass of the lubricant accounts for 5 wt% of the total mass of the auxiliary material, the mass of the lotus leaf extract accounts for 10 wt% of the total mass of the auxiliary material, the mass of the hydroxyl compound accounts for 3 wt% of the total mass of the auxiliary material, and the balance is the mass of the solvent.
Performance testing
1. Water resistance: 50mL of water was poured into the same place of the same clothes, and then placed in the wash bag (wet part directly contacted the inside of the wash bag) to observe the water resistance of the wash bag. The laundry bags in example 1, example 2 and comparative example 1 appeared wrinkled and not broken within 1min, and the laundry bags in comparative example 2 appeared unbroken within 1 min.
2. Dyeing effect: and observing whether the dyeing uniformity and the color depth of the washing bag are consistent by naked eyes. The example 1, the example 2 and the comparative example 2 were dyed uniformly and with consistent color depth, and the laundry bag of the comparative example 1 was dyed non-uniformly.
Claims (10)
1. A preparation process of a PVA (polyvinyl acetate) laundry bag for hospitals is characterized by comprising the following steps: the method comprises the following steps:
(1) adding water into a mixing kettle, then adding the raw materials, heating to 60-90 ℃ for 20-60min, and reacting to obtain a mixture;
(2) placing the mixture into an extruder for granulation to obtain polymer particles, and sequentially controlling the temperature range from a feed opening to a discharge opening to be 100-;
(3) the polymer particles are put into an extruder and blown within the temperature range of 180-220 ℃, and the temperature range from a feed opening to a discharge die head opening is controlled to be 100-220 ℃, 180-220 ℃ and 180-220 ℃;
(4) processing the film into bags and ropes;
(5) finally, the rope is thermally bonded on the bag through a heat sealing machine, the heat sealing temperature is 180-; and packaging the finished product.
The raw materials comprise: PVA, starch and auxiliary materials.
2. The process for preparing PVA laundry bag for hospital according to claim 1, characterized in that the mass of PVA is 60-90 wt% of the total raw material mass.
3. The process for preparing a PVA hospital laundry bag according to claim 1, wherein said starch is selected from one or more of corn starch, potato starch, tapioca starch, wheat starch, mixed bean starch.
4. The process for preparing PVA laundry bags for hospitals according to claim 3, characterized in that the mass of the starch accounts for 1-40 wt% of the total raw material mass.
5. The process for preparing a PVA laundry bag for hospitals according to claim 1, wherein the auxiliary materials are: solvent, lubricant, plant extract, and hydroxyl compound.
6. The process for preparing PVA laundry bag for hospital use according to claim 5, wherein the solvent is selected from one or more of water, ethanol, diethyl ether, acetone, chloroform and tetrahydrofuran.
7. The process for preparing PVA hospital laundry bag according to claim 5, wherein the lubricant is selected from one or more of paraffin wax, oxidized polyethylene wax, calcium stearate, and glyceryl stearate.
8. The preparation process of the PVA laundry bag for hospital according to claim 5, wherein the plant extract is selected from one or more of marigold extract, turmeric extract and lotus leaf extract.
9. The preparation process of the PVA laundry bag for hospitals according to claim 8, wherein the plant extract is a lotus leaf extract.
10. The process for preparing PVA laundry bags for hospitals according to claim 5, characterized in that the mass of the auxiliary material accounts for 1-10 wt% of the total raw material mass.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110954410.XA CN115056460A (en) | 2021-08-19 | 2021-08-19 | Preparation process of PVA (polyvinyl alcohol) laundry bag for hospital |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110954410.XA CN115056460A (en) | 2021-08-19 | 2021-08-19 | Preparation process of PVA (polyvinyl alcohol) laundry bag for hospital |
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