CN112592532A - Preparation process of vertical polypropylene infusion bag capable of avoiding shrinkage and cracking - Google Patents
Preparation process of vertical polypropylene infusion bag capable of avoiding shrinkage and cracking Download PDFInfo
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- CN112592532A CN112592532A CN202011280030.4A CN202011280030A CN112592532A CN 112592532 A CN112592532 A CN 112592532A CN 202011280030 A CN202011280030 A CN 202011280030A CN 112592532 A CN112592532 A CN 112592532A
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- 239000004743 Polypropylene Substances 0.000 title claims abstract description 67
- -1 polypropylene Polymers 0.000 title claims abstract description 67
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 67
- 238000001802 infusion Methods 0.000 title claims abstract description 63
- 238000002360 preparation method Methods 0.000 title claims abstract description 36
- 238000005336 cracking Methods 0.000 title claims abstract description 29
- 239000002994 raw material Substances 0.000 claims abstract description 55
- 239000003365 glass fiber Substances 0.000 claims abstract description 29
- 238000001746 injection moulding Methods 0.000 claims abstract description 22
- 239000007822 coupling agent Substances 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 11
- 239000004917 carbon fiber Substances 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims description 35
- 238000000071 blow moulding Methods 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 12
- 239000004611 light stabiliser Substances 0.000 claims description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 9
- 239000000498 cooling water Substances 0.000 claims description 8
- 239000012760 heat stabilizer Substances 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 5
- 230000018044 dehydration Effects 0.000 claims description 3
- 238000006297 dehydration reaction Methods 0.000 claims description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical group [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 2
- 230000002745 absorbent Effects 0.000 claims description 2
- 239000002250 absorbent Substances 0.000 claims description 2
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical group O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 2
- 229910052726 zirconium Inorganic materials 0.000 claims description 2
- 238000000465 moulding Methods 0.000 abstract description 4
- 230000008859 change Effects 0.000 abstract description 3
- 239000002131 composite material Substances 0.000 abstract description 2
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 239000003814 drug Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 238000001990 intravenous administration Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000000022 bacteriostatic agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000002439 hemostatic effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
- C08J5/0405—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres
- C08J5/043—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres with glass fibres
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61J—CONTAINERS SPECIALLY ADAPTED FOR MEDICAL OR PHARMACEUTICAL PURPOSES; DEVICES OR METHODS SPECIALLY ADAPTED FOR BRINGING PHARMACEUTICAL PRODUCTS INTO PARTICULAR PHYSICAL OR ADMINISTERING FORMS; DEVICES FOR ADMINISTERING FOOD OR MEDICINES ORALLY; BABY COMFORTERS; DEVICES FOR RECEIVING SPITTLE
- A61J1/00—Containers specially adapted for medical or pharmaceutical purposes
- A61J1/05—Containers specially adapted for medical or pharmaceutical purposes for collecting, storing or administering blood, plasma or medical fluids ; Infusion or perfusion containers
- A61J1/10—Bag-type containers
-
- 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
- B29C49/0005—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor characterised by the material
-
- 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
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/06—Injection blow-moulding
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
- C08J5/0405—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres
- C08J5/042—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres with carbon fibres
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- 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
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C2049/023—Combined blow-moulding and manufacture of the preform or the parison using inherent heat of the preform, i.e. 1 step blow moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/10—Polymers of propylene
- B29K2023/12—PP, i.e. polypropylene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/712—Containers; Packaging elements or accessories, Packages
- B29L2031/7148—Blood bags, medical bags
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/04—Ingredients characterised by their shape and organic or inorganic ingredients
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/06—Elements
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/14—Glass
Abstract
The invention relates to the technical field of medical supplies, and discloses a preparation process of a vertical polypropylene infusion bag capable of avoiding shrinkage and cracking, which comprises the following preparation steps: 1) preparing a polypropylene raw material; 2) preparing a bag blank; 3) and preparing an infusion bag. According to the vertical polypropylene infusion bag preparation process capable of avoiding shrinkage and cracking during injection molding, infusion bag preparation raw materials are subjected to composite re-preparation, long carbon fibers and alkali-free glass fibers are added, the raw materials are more smoothly fused by utilizing a compatilizer and a coupling agent, the overall strength of the raw materials is enhanced, the toughness is improved, the probability of shrinkage is reduced, the fault tolerance rate is high, the yield is improved, the raw materials are melted and water in the raw materials is evaporated by heating the raw materials to 180-fold 220 ℃ in an injection molding machine, the condition of uneven thickness of the raw materials during molding in a mold is ensured by maintaining pressure for multiple times in a short time, the condition of cracking caused by sudden temperature change is ensured by checking the temperature of the mold, and the rejection rate is reduced.
Description
Technical Field
The invention relates to the technical field of medical supplies, in particular to a preparation process of a vertical polypropylene infusion bag capable of avoiding shrinkage and cracking.
Background
The infusion or large-volume injection is a large-dose injection which is infused into the body by intravenous drip, the administration is more than 100ml at one time, the injection is a branch of the injection, the injection is usually packaged in a glass or plastic infusion bottle or bag, the injection does not contain bacteriostatic agent, the dropping speed is adjusted by an infusion apparatus when the injection is used, and the medicine is continuously and stably infused into the body, the plastic bag infusion method is an intravenous infusion method, and a treatment disc, a disposable sterile catheter, an infusion needle, an adhesive plaster, a liquid medicine, a tourniquet, a net cover or an infusion basket, an infusion stand, a pair of hemostatic forceps, a cotton swab, a bent disc, a splint, a bandage and the like are needed.
At present, the medical treatment developed society, the infusion becomes leading, many liquid medicines all need the venous transfusion art, the advantage is obvious, can be according to the speed of patient's condition adjustment infusion, and the dose is also well controlled, the reaction rate is also fast, and infusion bag has become indispensable goods and materials, current infusion bag preparation technology is in the preparation process, because do not pay attention to raw materials and control temperature scheduling problem, lead to the yield lower, it is the shrink that produces during infusion bag injection molding or fracture during the cooling, lead to the rejection rate too high, so propose a vertical type polypropylene infusion bag preparation technology who avoids shrink, fracture.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the preparation process of the vertical polypropylene infusion bag capable of avoiding shrinkage and cracking, which has the advantages of reducing the probability of shrinkage during injection molding and cracking during cooling, improving the yield and the like, and solves the problems of low yield and high rejection rate caused by no need of paying attention to raw materials, temperature control and the like in the preparation process of the existing infusion bag preparation process, and most of the problems are shrinkage or cracking during cooling during injection molding of the infusion bag.
(II) technical scheme
In order to achieve the purposes of reducing the probability of shrinkage during injection molding and cracking during cooling and improving the yield, the invention provides the following technical scheme: the preparation process of the vertical polypropylene infusion bag capable of avoiding shrinkage and cracking is characterized by comprising the following preparation steps:
1) preparing a polypropylene raw material: weighing polypropylene, long carbon fiber, alkali-free glass fiber, a heat stabilizer, a glass fiber surface treating agent, a coupling agent, a light stabilizer and a compatilizer according to a proportion, mixing at a low speed for 10 minutes in a mixer, adding boron-free alkali-free glass fiber for mixing and extruding, carrying out water cooling, drawing into strips and granulating, and carrying out screening dehydration to obtain a glass fiber reinforced polypropylene raw material;
2) preparing a bag blank: installing a bag blank mold on an injection molding machine, putting the polypropylene raw material prepared in the step 1) into a charging barrel of the injection molding machine, heating the charging barrel to 180-220 ℃, enabling the polypropylene raw material to enter a molten state, injecting the molten polypropylene raw material into the bag blank mold, maintaining the pressure for multiple times, keeping the pressure for 0.5-1.5 seconds each time, checking the temperature of the mold before cooling and demolding, putting the mold into cooling water after the temperature of the mold is reduced to 155 ℃, and demolding after cooling to obtain a bag blank;
3) preparing an infusion bag: and (3) putting the bag blank prepared in the step 2) into a vacuum machine, completely cooling, taking out, putting the bag blank into a blow molding machine, heating to 155-160 ℃, performing blow molding, performing transverse blow molding and longitudinal stretching, and cooling to obtain the vertical polypropylene infusion bag.
Preferably, the content of each component in the step 1): 49.5 to 80 percent of polypropylene, 5 to 25 percent of long carbon fiber, 5 to 25 percent of alkali-free glass fiber, 0.1 to 3.0 percent of heat stabilizer, 0.1 to 3.0 percent of glass fiber surface treating agent, 0.2 to 2 percent of coupling agent, 0.2 to 4.0 percent of light stabilizer and 1.3 to 5.5 percent of compatilizer.
Preferably, the compatilizer is maleic anhydride grafted compatilizer, and the light stabilizer is ultraviolet absorbent.
Preferably, the coupling agent is a zirconium-based coupling agent or a titanate coupling agent.
Preferably, the number of times of pressing in the step 2) is at least three.
Preferably, the temperature of the cooling water in the step 2) is 40-43 ℃.
Preferably, the time for putting the bag blank into the vacuum machine in the step 3) is 23-27 seconds.
(III) advantageous effects
Compared with the prior art, the invention provides the preparation process of the vertical polypropylene infusion bag capable of avoiding shrinkage and cracking, and the preparation process has the following beneficial effects:
1. this can avoid moulding plastics shrink, vertical type polypropylene infusion bag preparation technology of fracture carries out compound preparation again through preparing infusion bag preparation raw materials, adds long carbon fiber and alkali-free glass fiber, utilizes compatilizer and coupling agent to make the integration of raw materials more smooth and easy, strengthens the holistic intensity of raw materials, promotes toughness, reduces the probability of shrinking, and the fault-tolerant rate is big, improves the yield.
2. According to the preparation process of the vertical polypropylene infusion bag capable of avoiding shrinkage and cracking during injection molding, the raw materials are melted and water in the raw materials is evaporated by heating the raw materials to 180-220 ℃ in an injection molding machine, the condition of uneven thickness of the raw materials during molding in a mold is guaranteed by maintaining pressure for a plurality of times in a short time, the condition of cracking caused by sudden temperature change is guaranteed by checking the temperature of the mold, and the rejection rate is reduced.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
a preparation process of a vertical polypropylene infusion bag capable of avoiding shrinkage and cracking comprises the following preparation steps:
1) preparing a polypropylene raw material: weighing 49.5% of polypropylene, 20% of long carbon fiber, 20% of alkali-free glass fiber, 2% of heat stabilizer, 2% of glass fiber surface treating agent, 0.5% of coupling agent, 3% of light stabilizer and 3% of compatilizer according to a proportion, mixing at a low speed for 10 minutes in a mixer, adding boron-free alkali-free glass fiber for mixing and extruding, drawing into strips and cutting into granules after water cooling, and screening and dehydrating to obtain a glass fiber reinforced polypropylene raw material;
2) preparing a bag blank: installing a bag blank mold on an injection molding machine, putting the polypropylene raw material prepared in the step 1) into a charging barrel of the injection molding machine, heating the charging barrel to 200 ℃, enabling the polypropylene raw material to enter a molten state, injecting the molten polypropylene raw material into the bag blank mold, maintaining the pressure for multiple times, keeping the pressure for 0.5 second each time, checking the temperature of the mold before cooling and demolding, putting the mold into cooling water after the temperature of the mold is reduced to 155 ℃, and demolding after cooling to obtain a bag blank;
3) preparing an infusion bag: and (3) putting the bag blank prepared in the step 2) into a vacuum machine, completely cooling, taking out, putting the bag blank into a blow molding machine, heating to 155 ℃, performing blow molding, performing transverse blow molding and longitudinal stretching, and cooling to obtain the vertical polypropylene infusion bag.
The implementation results are as follows: the obtained infusion bag has high strength, certain lines exist on the surface, and the situations of shrinkage and cracking cannot occur.
Example two:
a preparation process of a vertical polypropylene infusion bag capable of avoiding shrinkage and cracking comprises the following preparation steps:
1) preparing a polypropylene raw material: weighing 55% of polypropylene, 15% of long carbon fiber, 15% of alkali-free glass fiber, 3% of heat stabilizer, 2% of glass fiber surface treating agent, 2% of coupling agent, 3% of light stabilizer and 5% of compatilizer according to a proportion, mixing at a low speed for 10 minutes in a mixer, adding boron-free alkali-free glass fiber for mixing and extruding, drawing into strips and cutting into granules after water cooling, and screening and dehydrating to obtain a glass fiber reinforced polypropylene raw material;
2) preparing a bag blank: installing a bag blank mold on an injection molding machine, putting the polypropylene raw material prepared in the step 1) into a charging barrel of the injection molding machine, heating the charging barrel to 180 ℃, enabling the polypropylene raw material to enter a molten state, injecting the molten polypropylene raw material into the bag blank mold, maintaining the pressure for multiple times, keeping the pressure for 1 second each time, checking the temperature of the mold before cooling and demolding, putting the mold into cooling water after the temperature of the mold is reduced to 155 ℃, and demolding after cooling to obtain a bag blank;
3) preparing an infusion bag: and (3) putting the bag blank prepared in the step 2) into a vacuum machine, completely cooling, taking out, putting the bag blank into a blow molding machine, heating to 160 ℃, performing blow molding, performing transverse blow molding and longitudinal stretching, and cooling to obtain the vertical polypropylene infusion bag.
The implementation results are as follows: the infusion bag has moderate strength, high yield, reduced probability of shrinkage and cracking, transparent and colorless finished product, moderate softness and suitability for infusion.
Example three:
a preparation process of a vertical polypropylene infusion bag capable of avoiding shrinkage and cracking comprises the following preparation steps:
1) preparing a polypropylene raw material: weighing 80% of polypropylene, 5% of long carbon fiber, 5% of alkali-free glass fiber, 1% of heat stabilizer, 3% of glass fiber surface treating agent, 1% of coupling agent, 2.5% of light stabilizer and 2.5% of compatilizer according to a proportion, mixing at a low speed for 10 minutes in a mixer, adding boron-free alkali-free glass fiber for mixing and extruding, carrying out bracing and granulating after water cooling, and carrying out screening and dehydration to obtain a glass fiber reinforced polypropylene raw material;
2) preparing a bag blank: installing a bag blank mold on an injection molding machine, putting the polypropylene raw material prepared in the step 1) into a charging barrel of the injection molding machine, heating the charging barrel to 200 ℃, enabling the polypropylene raw material to enter a molten state, injecting the molten polypropylene raw material into the bag blank mold, maintaining the pressure for multiple times, keeping the pressure for 0.5 second each time, checking the temperature of the mold before cooling and demolding, putting the mold into cooling water after the temperature of the mold is reduced to 155 ℃, and demolding after cooling to obtain a bag blank;
3) preparing an infusion bag: and (3) putting the bag blank prepared in the step 2) into a vacuum machine, completely cooling, taking out, putting the bag blank into a blow molding machine, heating to 155 ℃, performing blow molding, performing transverse blow molding and longitudinal stretching, and cooling to obtain the vertical polypropylene infusion bag.
The implementation results are as follows: the obtained infusion bag has higher strength than the common infusion bag, the shrinkage and cracking conditions are reduced to a certain extent, the surface has no grains, and the infusion bag is transparent and colorless.
Example four is an example without the addition of long carbon fibers and alkali-free glass fibers:
the preparation method comprises the following preparation steps:
1) preparing a polypropylene raw material: weighing 80% of polypropylene, 2% of heat stabilizer, 1% of coupling agent and 2% of light stabilizer according to a proportion, mixing at a low speed for 10 minutes in a mixer, mixing and extruding, water cooling, bracing and granulating, and sieving and dehydrating to obtain a glass fiber reinforced polypropylene raw material;
2) preparing a bag blank: installing a bag blank mold on an injection molding machine, putting the polypropylene raw material prepared in the step 1) into a charging barrel of the injection molding machine, heating the charging barrel to 200 ℃, enabling the polypropylene raw material to enter a molten state, injecting the molten polypropylene raw material into the bag blank mold, maintaining the pressure for multiple times, keeping the pressure for 0.5 second each time, checking the temperature of the mold before cooling and demolding, putting the mold into cooling water after the temperature of the mold is reduced to 155 ℃, and demolding after cooling to obtain a bag blank;
3) preparing an infusion bag: and (3) putting the bag blank prepared in the step 2) into a vacuum machine, completely cooling, taking out, putting the bag blank into a blow molding machine, heating to 158 ℃, performing blow molding, performing transverse blow molding and longitudinal stretching, and cooling to obtain the vertical polypropylene infusion bag.
The implementation results are as follows: the strength of the obtained infusion bag is equivalent to that of a common infusion bag, and the cracking condition in the manufacturing process is reduced.
And (4) judging the standard: the obtained polypropylene infusion bag is transparent and colorless, has a smooth surface, does not have bubbles, and has high strength and strong toughness.
The invention has the beneficial effects that: by carrying out composite re-preparation on the preparation raw materials of the infusion bag, adding the long carbon fiber and the alkali-free glass fiber, utilizing the compatilizer and the coupling agent to ensure that the raw materials are more smoothly fused, enhancing the integral strength of the raw materials, improving the toughness, reducing the shrinkage probability, having high fault tolerance rate and improving the yield, the raw materials are melted and the water content in the raw materials is evaporated by heating the raw materials to 180-220 ℃ in the injection molding machine, the condition of uneven thickness of the raw materials during the molding in a mold is ensured by multiple times of pressure maintaining in short time, the temperature of the mould is checked to ensure that the mould does not crack due to sudden temperature change, the rejection rate is reduced, the problems that in the preparation process of the existing infusion bag, the yield is low because of the problems of not paying attention to raw materials, controlling temperature and the like, and the most of the problems are that shrinkage is generated during injection molding of the infusion bag or cracking is generated during cooling, so that the rejection rate is too high.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The preparation process of the vertical polypropylene infusion bag capable of avoiding shrinkage and cracking is characterized by comprising the following preparation steps:
1) preparing a polypropylene raw material: weighing polypropylene, long carbon fiber, alkali-free glass fiber, a heat stabilizer, a glass fiber surface treating agent, a coupling agent, a light stabilizer and a compatilizer according to a proportion, mixing at a low speed for 10 minutes in a mixer, adding boron-free alkali-free glass fiber for mixing and extruding, carrying out water cooling, drawing into strips and granulating, and carrying out screening dehydration to obtain a glass fiber reinforced polypropylene raw material;
2) preparing a bag blank: installing a bag blank mold on an injection molding machine, putting the polypropylene raw material prepared in the step 1) into a charging barrel of the injection molding machine, heating the charging barrel to 180-220 ℃, enabling the polypropylene raw material to enter a molten state, injecting the molten polypropylene raw material into the bag blank mold, maintaining the pressure for multiple times, keeping the pressure for 0.5-1.5 seconds each time, checking the temperature of the mold before cooling and demolding, putting the mold into cooling water after the temperature of the mold is reduced to 155 ℃, and demolding after cooling to obtain a bag blank;
3) preparing an infusion bag: and (3) putting the bag blank prepared in the step 2) into a vacuum machine, completely cooling, taking out, putting the bag blank into a blow molding machine, heating to 155-160 ℃, performing blow molding, performing transverse blow molding and longitudinal stretching, and cooling to obtain the vertical polypropylene infusion bag.
2. The preparation process of the vertical polypropylene infusion bag capable of avoiding shrinkage and cracking as claimed in claim 1, wherein the content of each component in the step 1): 49.5 to 80 percent of polypropylene, 5 to 25 percent of long carbon fiber, 5 to 25 percent of alkali-free glass fiber, 0.1 to 3.0 percent of heat stabilizer, 0.1 to 3.0 percent of glass fiber surface treating agent, 0.2 to 2 percent of coupling agent, 0.2 to 4.0 percent of light stabilizer and 1.3 to 5.5 percent of compatilizer.
3. The process for preparing a vertical polypropylene infusion bag capable of avoiding shrinkage and cracking as claimed in claim 1, wherein the compatibilizer is maleic anhydride grafted compatibilizer, and the light stabilizer is ultraviolet absorbent.
4. The process for preparing an upright polypropylene infusion bag capable of avoiding shrinkage and cracking as claimed in claim 1, wherein the coupling agent is a zirconium coupling agent or a titanate coupling agent.
5. The process for preparing an upright polypropylene infusion bag capable of avoiding shrinkage and cracking as claimed in claim 1, wherein the number of times of pressure maintaining in the step 2) is at least three.
6. The process for preparing an upright polypropylene infusion bag capable of avoiding shrinkage and cracking as claimed in claim 1, wherein the temperature of the cooling water in the step 2) is 40-43 ℃.
7. The process for preparing an upright polypropylene infusion bag capable of avoiding shrinkage and cracking as claimed in claim 1, wherein the time for placing the bag blank in the vacuum machine in the step 3) is 23-27 seconds.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114603958A (en) * | 2022-03-09 | 2022-06-10 | 河间市精诚塑业有限公司 | Heat shrinkable film and preparation method thereof |
| CN115124783A (en) * | 2022-07-11 | 2022-09-30 | 金旸（厦门）新材料科技有限公司 | Reinforced blow molding polypropylene composite material and preparation method thereof |
-
2020
- 2020-11-16 CN CN202011280030.4A patent/CN112592532A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114603958A (en) * | 2022-03-09 | 2022-06-10 | 河间市精诚塑业有限公司 | Heat shrinkable film and preparation method thereof |
| CN115124783A (en) * | 2022-07-11 | 2022-09-30 | 金旸（厦门）新材料科技有限公司 | Reinforced blow molding polypropylene composite material and preparation method thereof |
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