CN108422721B - PVA composite plastic - Google Patents

PVA composite plastic Download PDF

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CN108422721B
CN108422721B CN201810222428.9A CN201810222428A CN108422721B CN 108422721 B CN108422721 B CN 108422721B CN 201810222428 A CN201810222428 A CN 201810222428A CN 108422721 B CN108422721 B CN 108422721B
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pva
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CN108422721A (en
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陈绍永
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Sibikang Xiamen New Materials Co ltd
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Sibikang Xiamen New Materials Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/08—Interconnection of layers by mechanical means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • 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
    • C08K13/02—Organic and 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
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/16—Halogen-containing compounds
    • 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
    • C08K5/00—Use of organic ingredients
    • C08K5/16—Nitrogen-containing compounds
    • C08K5/21—Urea; Derivatives thereof, e.g. biuret
    • 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
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/16—Halogen-containing compounds
    • C08K2003/162—Calcium, strontium or barium halides, e.g. calcium, strontium or barium chloride
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/18—Applications used for pipes

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)
  • Materials For Medical Uses (AREA)

Abstract

The invention discloses PVA composite plastic, which belongs to the technical field of high molecular polymers and comprises a first layer and a second layer, wherein the first layer comprises at least one of a PVC layer, a PET layer, a POF layer, a TPU layer, a PE layer, a PS layer, a PC layer, an ABS layer, a PU layer, a PA layer, a TPE layer and a TPR layer, the second layer is a PVA layer, and the first layer and the second layer are prepared by co-extrusion molding; the ratio of the thickness of the first layer to the thickness of the second layer is 3-8: 2-7; the second layer has a density of 1.2-2.4g/cm3The second layer comprises 20 to 80% of the total weight of the second layer and the first layer. The invention has the advantages of higher strength, better flexibility and no harm to the health safety of human bodies.

Description

PVA composite plastic
Technical Field
The invention relates to the technical field of high molecular polymers, in particular to PVA composite plastic.
Background
Polyvinyl alcohol (PVA) is a polymer, the performance of which is between that of plastics and rubber, the PVA has better strong adhesion, involucra flexibility, smoothness, oil resistance, solvent-resistant body protection, gas barrier property and the like, and the PVA is sanitary, nontoxic and biodegradable under certain conditions, and has wide application in the industries of textile, food, medicine, building, wood processing, paper making, printing, agriculture and the like. The medical grade polyvinyl alcohol is safe and nontoxic to human bodies, free of stimulation, sensitization and cytotoxicity and good in biocompatibility, and is one of ideal materials for preparing medical devices.
However, since PVA is too soft, its strength and flexibility are not good, thereby limiting the range of applications thereof. Therefore, the plastic with higher strength and better flexibility has higher market value.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the PVA composite plastic which has the advantages of higher strength and better flexibility.
In order to achieve the purpose, the invention provides the following technical scheme:
a PVA composite plastic comprises a first layer and a second layer, wherein the first layer comprises at least one of a PVC layer, a PET layer, a POF layer, a TPU layer, a PE layer, a PS layer, a PC layer, an ABS layer, a PU layer, a PA layer, a TPE layer and a TPR layer, the second layer is a PVA layer, and the first layer and the second layer are prepared by co-extrusion molding; of the first layerThe ratio of the thickness to the thickness of the second layer is 3-8: 2-7; the density of the second layer is 1.2-2.4g/cm3And the second layer comprises 20 to 80% of the total weight of the second layer and the first layer.
Through the technical scheme, the first layer and the second layer are manufactured through co-extrusion molding, and the second layer is the PVA layer, so that the PVA composite plastic is non-toxic and harmless, and has no adverse effect on human health, and can be applied to medical catheters, feeding bottles and the like. Although the PVA layer has good flexibility, its strength is not high enough. The first layer is at least one of PVC layer, PET layer, POF layer, TPU layer, and PVC layer, PET layer, POF layer, TPU layer, PE layer, PS layer, PC layer, ABS layer, PU layer, PA layer, TPE layer, TPR layer have better intensity. After the second layer and the first layer are co-extruded and formed, the density of the second layer is 1.2-2.4g/cm3The second layer accounts for 20-80% of the total weight of the second layer and the first layer, the flexibility and the strength of the formed PVA composite plastic are adjusted, and the thickness ratio of the first layer to the second layer is 3-8:2-7, so that the PVA composite plastic has better flexibility and strength. In addition, the PVC layer, the PET layer, the POF layer and the TPU layer in the first layer all have a good anti-corrosion function, are safe and reliable in use, and have long service life.
A PVA composite plastic comprises a first layer and a second layer, wherein the first layer comprises at least one of a PVC layer, a PET layer, a POF layer, a TPU layer, a PE layer, a PS layer, a PC layer, an ABS layer, a PU layer, a PA layer, a TPE layer and a TPR layer, the second layer is a PVA composition layer, and the first layer and the second layer are prepared by co-extrusion molding; the ratio of the thickness of the first layer to the thickness of the second layer is 3-8: 2-7; the density of the second layer is 1.2-2.4g/cm3Said second layer comprising 20 to 80% of the total weight of the second layer and the first layer; the PVA composition layer is obtained by extrusion molding of a PVA composition, and the PVA composition comprises the following components in parts by weight:
60-90 parts of PVA;
0.1-3 parts of glutaraldehyde;
4-10 parts of urea;
5-15 parts of glycerol;
2-10 parts of calcium chloride;
0.1-2 parts of acid;
the acid is one of 10-98% by mass of sulfuric acid aqueous solution, aliphatic carboxylic acid, pyrophosphoric acid and pyrosulfuric acid.
Through the technical scheme, the PVA in the PVA composition and glutaraldehyde are subjected to a cross-linking reaction to form a three-dimensional network structure, so that the strength and the heat resistance of the PVA composition are improved. The acid environment can promote the crosslinking reaction of glutaraldehyde and PVA, raise the decomposition temperature of PVA composition, lower the melting temperature of crosslinked PVA composition and raise the machinability of PVA composition. The urea is dispersed in the PVA composition, so that the acting force among PVA molecules is reduced, and the melting point of the PVA composition is obviously reduced. The glycerol enables the PVA to swell and dilute, reduces the intermolecular acting force of the PVA and plays a role in reducing the melting temperature of the PVA composition; calcium chloride also acts to lower the melting temperature of the PVA composition.
More preferably: the preparation method of the PVA composition comprises the following steps:
step one, mixing PVA and acid according to parts by weight, adding urea, glycerol and calcium chloride, heating at the temperature of 140-;
step two, uniformly mixing the granules obtained by granulation in the step one with glutaraldehyde at the temperature of 140-220 ℃ to obtain a PVA composition intermediate material;
step three, soaking the PVA composition intermediate material obtained in the step two in a sodium hydroxide solution with the concentration of 5-10wt% for 24-48 h;
and step four, taking out the PVA composition intermediate material from the sodium hydroxide solution, rinsing with deionized water, and drying to obtain the PVA composition.
Through the technical scheme, in the first step, PVA, urea, glycerol and calcium chloride are fully and uniformly melted and mixed in an acid environment, and the distribution uniformity of each component in the granules is improved. In the second step, the granules and glutaraldehyde fully undergo a crosslinking reaction to form a three-dimensional network structure, so that the decomposition temperature of the intermediate material of the PPVA composition is increased, the melting temperature of the intermediate material of the PVA composition is reduced, and the processability of the intermediate material of the PVA composition is improved. After the intermediate material of the PVA composition is fully soaked in the sodium hydroxide solution and washed in the third step and the fourth step, the finally obtained PVA composition has better integrity and stability of the particles.
More preferably: the molecular weight of the PVA is 25000-3000000Da, and the alcoholysis degree is 50-99%.
By the technical scheme, the smaller the molecular weight of PVA is, the lower the melting temperature is; the lower the degree of alcoholysis of PVA, the lower the melting temperature. The molecular weight and the alcoholysis degree within the above ranges, respectively, contribute to a lower melting temperature of the PVA compositions herein.
More preferably: the PVA composite plastic is a pipe, and the first layer is formed by co-extrusion and is arranged outside the second layer.
Through above-mentioned technical scheme, the second floor is the PVA layer, and the environmental protection is innoxious side, and in addition first layer makes tubular product have better compressive strength and tensile strength, consequently, this kind of tubular product can be used to make syringe, transfer line, medical catheter etc. and liquid medicine and PVA layer direct contact, and the liquid medicine is difficult for receiving the pollution, uses more relieved and safety. On the contrary, the pipe made of PVC, silica gel and TPU materials is directly on the market, and when the liquid medicine is in direct contact with the pipe, harmful substances in the pipe easily pollute the liquid medicine to different degrees and even harm the health of human bodies.
More preferably: the PVA composite plastic is a sheet.
Through above-mentioned technical scheme, the second floor is the PVA layer, and the nontoxic side effect of environmental protection, in addition first layer makes the sheet have better compressive strength and tensile strength, consequently, infusion bag, food storage bag, beverage bottle etc. can be made to this kind of sheet, when with direct contact such as liquid medicine, food, is difficult for causing the pollution to liquid medicine, food, improves the security of using. In the market, the pipe is directly made of PVC, silica gel and TPU materials, and when liquid medicine is in direct contact with the pipe, harmful substances in the liquid medicine easily pollute the liquid medicine, food and the like to different degrees and even harm the health of human bodies.
More preferably: the first layer is prepared by adopting a double-material extruder, wherein the temperature of a first area of the double-material extruder is 170-175 ℃, the temperature of a second area of the double-material extruder is 175-180 ℃, the temperature of a third area of the double-material extruder is 180-183 ℃, and the temperature of a fourth area of the double-material extruder is 178-180 ℃; the rotating speed of a main machine of the double-material extruder is 15-18r/s, the feeding rotating speed is 11-13r/s, and the first layer is obtained through extrusion.
Through the technical scheme, after PVC, PET, POF, TPU and other materials are processed by the double-material extruder, the obtained first layer is uniform in texture and good in compactness, and the PVA composite plastic formed by co-extrusion molding in the later stage has better mechanical strength and flexibility.
More preferably: the PVA layer is prepared by a PVA raw material through a double-material extruder, the PVA raw material is dried before preparation, the temperature of the drying treatment is 75-80 ℃, and the time of the drying treatment is 4-5 h.
Through the technical scheme, as the PVA raw material has better water absorption performance, the moisture in the PVA raw material is dried before the PVA is prepared by adopting the double-material extruder, which is favorable for keeping the PVA layer obtained by preparation to have better integral uniformity. And drying treatment is carried out within the above temperature and time ranges, so that the water in the PVA can be sufficiently removed.
More preferably: and when the PVA raw material after drying treatment is treated in a double-material extruder, the temperature of a first zone is 180-185 ℃, the temperature of a second zone is 185-188 ℃, the temperature of a third zone is 190-193 ℃, the temperature of a fourth zone is 195-198 ℃, and the PVA layer is obtained by extrusion.
Through the technical scheme, the PVA layer obtained by the method has better integral uniformity, and a better soft effect is kept.
In conclusion, the invention has the following beneficial effects:
the PVA composite plastic is prepared by co-extrusion molding of a PVA layer and at least one of a PVC layer, a PET layer, a POF layer and a TPU layer, so that the formed PVA composite plastic has better mechanical strength and flexibility;
2. the PVA composite plastic in the application can be used for manufacturing medical catheters, infusion tubes, infusion bags, syringes, nipples, food storage bags, beverage bottles and the like, and the parts which are directly contacted with liquid medicine and food do not contain toxic and harmful substances, so that the PVA composite plastic is safe and environment-friendly; and the part deviating from the liquid medicine and the food has hard texture, and is convenient to carry and place.
Drawings
FIG. 1 is a schematic view showing the structure of a tubular PVA composite plastic according to example 1, which is mainly used for embodying the structure of a first layer and a second layer;
FIG. 2 is a schematic view showing the structure of a PVA composite plastic in the form of a sheet in example 10, which is mainly used for embodying the structure of a first layer and a second layer.
In the figure, 1, the first layer; 2. a second layer.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
Example 1: a PVA composite plastic is tubular, as shown in figure 1, and comprises a first layer 1 (outer side) and a second layer 2 (inner side), wherein the first layer 1 is a PVC layer, the second layer 2 is a PVA layer, and is prepared by co-extrusion molding, and the density of the PVA layer is 1.2g/cm3And the PVC layer is coated outside the PVA layer, wherein the ratio of the thickness of the PVC layer to the thickness of the PVA layer is 3: 7, and the PVA layer accounts for 80 percent of the total weight of the PVA layer and the PVC layer.
Wherein, in the preparation process of the PVC layer, the temperature of a first zone of the double-material extruder is 170 ℃, the temperature of a second zone is 175 ℃, the temperature of a third zone is 180 ℃, and the temperature of a fourth zone is 180 ℃; the rotating speed of a main machine of the double-material extruder is 15r/s, the feeding rotating speed is 11r/s, and the PVC layer is obtained by extrusion. The PVA layer is obtained by preparing a PVA raw material through a double-material extruder, wherein the PVA raw material is dried before preparation, the drying temperature is 80 ℃, and the drying time is 4 hours. When the PVA raw material is processed in a double-material extruder, the temperature of the first zone is 180 ℃, the temperature of the second zone is 185 ℃, the temperature of the third zone is 190 ℃, and the temperature of the fourth zone is 195 ℃ to obtain a PVA layer by extrusion.
Example 2: a PVA composite plastic differing from example 1 in that the density of the PVA layer was 1.8g/cm3。
Practice ofExample 3: a PVA composite plastic differing from example 1 in that the density of the PVA layer was 2.4g/cm3The ratio of the thickness of the PVC layer to the thickness of the PVA layer is 5: 5.
Wherein, in the preparation process of the PVC layer, the temperature of a first zone of the double-material extruder is 175 ℃, the temperature of a second zone is 180 ℃, the temperature of a third zone is 183 ℃, and the temperature of a fourth zone is 178 ℃; the rotating speed of a main machine of the double-material extruder is 18r/s, the feeding rotating speed is 13r/s, and the PVC layer is obtained by extrusion. The PVA layer is obtained by preparing a PVA raw material through a double-material extruder, wherein the PVA raw material is dried before preparation, the drying temperature is 75 ℃, and the drying time is 5 hours. When the PVA raw material is processed in a two-material extruder, the temperature of the first zone is 185 ℃, the temperature of the second zone is 188 ℃, the temperature of the third zone is 193 ℃, and the temperature of the fourth zone is 198 ℃, and the PVA layer is obtained by extrusion.
Example 4: a PVA composite plastic, which is different from the PVA composite plastic in example 1 in that the ratio of the thickness of the PVC layer to the thickness of the PVA layer is 8:2, and the PVA layer accounts for 20% of the total weight of the PVA layer and the PVC layer.
Example 5: a PVA composite plastic differing from example 1 in that the density of the PVA layer was 2.0g/cm3, the ratio of the thickness of the PVC layer to the thickness of the PVA layer was 4: 6, and the PVA layer accounted for 70% of the total weight of the PVA layer and the PVC layer.
Example 6: a PVA composite plastic differing from example 1 in that the density of the PVA layer was 1.5g/cm3, the ratio of the thickness of the PVC layer to the thickness of the PVA layer was 6: 4, and the PVA layer accounted for 40% of the total weight of the PVA layer and the PVC layer.
Example 7: a PVA composite plastic, which differs from example 1 in that the PVC layer is replaced by a PET layer.
Example 8: a PVA composite plastic, which differs from example 1 in that the PVC layer is replaced by a POF layer.
Example 9: a PVA composite plastic, which differs from example 1 in that the PVC layer is replaced by a TPU layer.
Example 10: a PVA composite plastic, which is different from the one in example 1, is in a sheet shape, and the cross section thereof is shown in FIG. 2.
Examples 11 to 16: a PVA composite plastic is different from the PVA composite plastic in the embodiment 1 in that a PVA composition layer is adopted to replace a PVA layer, the PVA composition layer is prepared by extruding and molding the PVA composition through a double-head extruder, wherein the components and corresponding parts by weight of the components in the PVA composition are shown in the table 1, and the acid adopts a sulfuric acid water solution with the concentration of 98 percent. And the PVA composition is prepared by the following steps:
mixing PVA and acid in parts by weight, adding urea, glycerol and calcium chloride, heating at 140 ℃ to melt the PVA to obtain an acid PVA primary mixed material, and granulating at 140 ℃ to obtain granules;
step two, uniformly mixing the granules obtained by granulation in the step one with glutaraldehyde at 140 ℃ to obtain an intermediate material of the PVA composition;
step three, soaking the PVA composition intermediate material obtained in the step two in a sodium hydroxide solution with the concentration of 5 wt% for 48 hours; and step four, taking out the PVA composition intermediate material from the sodium hydroxide solution, rinsing with deionized water, and drying to obtain the PVA composition.
Wherein, the molecular weight of PVA is 25000-300000Da, and the alcoholysis degree is 50-99%.
TABLE 1 Components included in PVA compositions of examples 11-16 and their respective weights (kg)
Figure BDA0001599736040000061
Example 17: a PVA composite plastic differing from example 11 in that in the first step, PVA was heated at 180 ℃ to melt and an acidic PVA master batch was obtained, and pelletized at a temperature of 220 ℃ to obtain pellets.
Example 18: a PVA composite plastic differing from example 11 in that in the first step, PVA was heated at 220 ℃ to melt and an acidic PVA master batch was obtained, and granulated at 220 ℃ to obtain pellets.
Example 19: a PVA composite plastic was different from example 11 in that in the second step, pellets were uniformly mixed with glutaraldehyde at 220 ℃ to obtain an intermediate material of a PVA composition.
Example 20: a PVA composite plastic is different from the PVA composite plastic in the embodiment 11 in that in the third step, the PVA composite intermediate material is soaked in 8 wt% sodium hydroxide solution for 35 h.
Example 21: a PVA composite plastic is different from the PVA composite plastic in the embodiment 11 in that in the third step, the PVA composite intermediate material is soaked in a sodium hydroxide solution with the concentration of 10 weight percent for 24 hours.
Comparative example 1: a composite plastic differing from example 1 in that an equal amount of PVC layer was used instead of PVA layer.
Comparative example 2: a PVA composite plastic, differing from example 1 in that the PVC layer is on the inside and the PVA layer is on the outside.
Characterization test
Test samples: the PVA composite plastics obtained in examples 1 to 21 were selected as test samples 1 to 21, and the composite plastics obtained in comparative examples 1 to 2 and the PVA composite plastics were selected as control samples 1 to 2.
The test method comprises the following steps: the test samples 1-21 and the control samples 1-2 were tested for elongation at break and shore hardness.
And (3) test results: the indexes of the test samples 1 to 21 and the control samples 1 to 2 are shown in Table 2.
TABLE 2 indexes of test samples 1-21 and control samples 1-2
Figure BDA0001599736040000071
As can be seen from table 2, the elongation at break and shore hardness in the test samples 1 to 21 are respectively greater than those in the control sample 1, and the hemolysis in the test samples 1 to 21 is much smaller than that in the control sample 1; although the elongation at break and the shore hardness in the control sample 2 are respectively close to those in the test samples 1-21, the hemolysis of the control sample 2 is far higher than that in the test samples 1-21, which indicates that the test samples 1-21 have better mechanical strength and toughness, are safe and harmless, are not easy to cause harm to human bodies, while the control sample 1 has poorer mechanical strength and toughness and is harmful to human bodies, and the control sample 2 has larger influence on the hemolysis.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims (7)

1. The PVA composite plastic is characterized by comprising a first layer (1) and a second layer (2), wherein the first layer (1) comprises at least one of a PVC layer, a PET layer, a POF layer, a TPU layer, a PE layer, a PS layer, a PC layer, an ABS layer, a PU layer, a PA layer and a TPR layer, the second layer (2) is a PVA composition layer, and the first layer (1) and the second layer (2) are prepared by co-extrusion molding; the ratio of the thickness of the first layer (1) to the thickness of the second layer (2) is 3-8: 2-7; the density of the second layer (2) is 1.2-2.4g/cm3Said second layer (2) representing 20-80% of the total weight of the second layer (2) and the first layer (1); the PVA composition layer is obtained by extrusion molding of a PVA composition, and the PVA composition comprises the following components in parts by weight:
60-90 parts of PVA;
0.1-3 parts of glutaraldehyde;
4-10 parts of urea;
5-15 parts of glycerol;
2-10 parts of calcium chloride;
0.1-2 parts of acid;
the acid is one of 10-98% by mass of sulfuric acid aqueous solution, aliphatic carboxylic acid, pyrophosphoric acid and pyrosulfuric acid;
the preparation method of the PVA composition comprises the following steps:
step one, mixing PVA and acid according to parts by weight, adding urea, glycerol and calcium chloride, heating at the temperature of 140-;
step two, uniformly mixing the granules obtained by granulation in the step one with glutaraldehyde at the temperature of 140-220 ℃ to obtain a PVA composition intermediate material;
step three, soaking the PVA composition intermediate material obtained in the step two in a sodium hydroxide solution with the concentration of 5-10wt% for 24-48 h;
step four, taking out the PVA composition intermediate material from the sodium hydroxide solution, rinsing with deionized water, and drying to obtain the PVA composition;
the PVA composite plastic is used for manufacturing medical catheters, infusion tubes, infusion bags, syringes, nipples, food storage bags and beverage bottles.
2. The PVA composite plastic according to claim 1, wherein the molecular weight of PVA is 25000-3000000Da and the alcoholysis degree is 50-99%.
3. The PVA composite plastic according to any one of claims 1 to 2, wherein the PVA composite plastic is a pipe, and the first layer (1) is co-extruded and arranged outside the second layer (2).
4. The PVA composite plastic according to any one of claims 1 to 2, wherein the PVA composite plastic is a sheet.
5. The PVA composite plastic according to claim 4, wherein the first layer (1) is prepared by a two-material extruder, wherein the temperature of the first zone of the two-material extruder is 170-175 ℃, the temperature of the second zone of the two-material extruder is 175-180 ℃, the temperature of the third zone of the two-material extruder is 180-183 ℃, and the temperature of the fourth zone of the two-material extruder is 178-180 ℃; the rotating speed of the main machine of the double-material extruder is 15-18r/s, the feeding rotating speed is 11-13r/s, and the first layer (1) is obtained by extrusion.
6. The PVA composite plastic of claim 4, wherein the PVA composition layer is prepared by a PVA composition through a two-material extruder, the PVA composition is subjected to drying treatment before preparation, the temperature of the drying treatment is 75-80 ℃, and the time of the drying treatment is 4-5 h.
7. The PVA composite plastic according to claim 6, wherein the PVA composition after drying treatment is extruded at temperatures of 180-185 ℃ in the first zone, 185-188 ℃ in the second zone, 190-193 ℃ in the third zone and 195-198 ℃ in the fourth zone in a two-material extruder to obtain the second PVA composition layer.
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