CN114381080B - Application of polyvinyl alcohol material, material for suction tube, preparation method of material and suction tube - Google Patents
Application of polyvinyl alcohol material, material for suction tube, preparation method of material and suction tube Download PDFInfo
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- CN114381080B CN114381080B CN202210253397.XA CN202210253397A CN114381080B CN 114381080 B CN114381080 B CN 114381080B CN 202210253397 A CN202210253397 A CN 202210253397A CN 114381080 B CN114381080 B CN 114381080B
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- polyvinyl alcohol
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- suction tube
- straw
- suction pipe
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- 239000000463 material Substances 0.000 title claims abstract description 160
- 239000004372 Polyvinyl alcohol Substances 0.000 title claims abstract description 155
- 229920002451 polyvinyl alcohol Polymers 0.000 title claims abstract description 155
- 238000002360 preparation method Methods 0.000 title abstract description 24
- 239000010902 straw Substances 0.000 claims abstract description 55
- 239000004014 plasticizer Substances 0.000 claims abstract description 32
- 239000006057 Non-nutritive feed additive Substances 0.000 claims abstract description 27
- 239000002994 raw material Substances 0.000 claims abstract description 22
- 238000006116 polymerization reaction Methods 0.000 claims description 59
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 42
- 238000006136 alcoholysis reaction Methods 0.000 claims description 35
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 30
- 229920001223 polyethylene glycol Polymers 0.000 claims description 28
- 239000002245 particle Substances 0.000 claims description 27
- 239000002202 Polyethylene glycol Substances 0.000 claims description 24
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims description 24
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 18
- URAYPUMNDPQOKB-UHFFFAOYSA-N triacetin Chemical compound CC(=O)OCC(OC(C)=O)COC(C)=O URAYPUMNDPQOKB-UHFFFAOYSA-N 0.000 claims description 16
- 239000000314 lubricant Substances 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 13
- FBPFZTCFMRRESA-FSIIMWSLSA-N D-Glucitol Natural products OC[C@H](O)[C@H](O)[C@@H](O)[C@H](O)CO FBPFZTCFMRRESA-FSIIMWSLSA-N 0.000 claims description 12
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 claims description 12
- 239000000600 sorbitol Substances 0.000 claims description 12
- 235000010356 sorbitol Nutrition 0.000 claims description 12
- 239000000155 melt Substances 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- KMZHZAAOEWVPSE-UHFFFAOYSA-N 2,3-dihydroxypropyl acetate Chemical compound CC(=O)OCC(O)CO KMZHZAAOEWVPSE-UHFFFAOYSA-N 0.000 claims description 8
- FBPFZTCFMRRESA-KVTDHHQDSA-N D-Mannitol Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-KVTDHHQDSA-N 0.000 claims description 8
- 229930195725 Mannitol Natural products 0.000 claims description 8
- 239000001087 glyceryl triacetate Substances 0.000 claims description 8
- 235000013773 glyceryl triacetate Nutrition 0.000 claims description 8
- 239000000594 mannitol Substances 0.000 claims description 8
- 235000010355 mannitol Nutrition 0.000 claims description 8
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 claims description 8
- 229960002622 triacetin Drugs 0.000 claims description 8
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 claims description 8
- 239000004347 Glyceryl monoacetate Substances 0.000 claims description 7
- 235000019442 glyceryl monoacetate Nutrition 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 239000004348 Glyceryl diacetate Substances 0.000 claims description 6
- 235000019443 glyceryl diacetate Nutrition 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- UXDDRFCJKNROTO-UHFFFAOYSA-N Glycerol 1,2-diacetate Chemical compound CC(=O)OCC(CO)OC(C)=O UXDDRFCJKNROTO-UHFFFAOYSA-N 0.000 claims description 5
- 150000001875 compounds Chemical class 0.000 claims description 5
- 238000001125 extrusion Methods 0.000 claims description 5
- 238000005469 granulation Methods 0.000 claims description 4
- 230000003179 granulation Effects 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 17
- 239000002689 soil Substances 0.000 abstract description 11
- 230000007613 environmental effect Effects 0.000 abstract description 8
- 230000008901 benefit Effects 0.000 abstract description 7
- 229920005862 polyol Polymers 0.000 description 16
- -1 Polyethylene Polymers 0.000 description 14
- 238000012545 processing Methods 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 12
- 150000003077 polyols Chemical class 0.000 description 12
- 238000000034 method Methods 0.000 description 9
- 239000004698 Polyethylene Substances 0.000 description 8
- 229920000573 polyethylene Polymers 0.000 description 8
- 229920003023 plastic Polymers 0.000 description 6
- 239000004033 plastic Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000004090 dissolution Methods 0.000 description 4
- 238000003912 environmental pollution Methods 0.000 description 4
- 229940068918 polyethylene glycol 400 Drugs 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 239000003963 antioxidant agent Substances 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 229940113116 polyethylene glycol 1000 Drugs 0.000 description 3
- 229940085675 polyethylene glycol 800 Drugs 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000003078 antioxidant effect Effects 0.000 description 2
- 235000013361 beverage Nutrition 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000004595 color masterbatch Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000035622 drinking Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 239000012760 heat stabilizer Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 231100000252 nontoxic Toxicity 0.000 description 2
- 230000003000 nontoxic effect Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 229940093430 polyethylene glycol 1500 Drugs 0.000 description 2
- 238000003900 soil pollution Methods 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- 238000004383 yellowing Methods 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 229920002988 biodegradable polymer Polymers 0.000 description 1
- 239000004621 biodegradable polymer Substances 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009775 high-speed stirring Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000003760 magnetic stirring Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 239000003973 paint Substances 0.000 description 1
- 230000036314 physical performance Effects 0.000 description 1
- 229940113115 polyethylene glycol 200 Drugs 0.000 description 1
- 229940068886 polyethylene glycol 300 Drugs 0.000 description 1
- 229940057847 polyethylene glycol 600 Drugs 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000002195 soluble material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009044 synergistic interaction Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- 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
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47G—HOUSEHOLD OR TABLE EQUIPMENT
- A47G21/00—Table-ware
- A47G21/18—Drinking straws or the like
-
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/06—Biodegradable
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention belongs to the technical field of straw materials, and relates to application of a polyvinyl alcohol material, a straw material, a preparation method of the straw material and a straw. The invention provides an application of a polyvinyl alcohol material in preparing a suction pipe. The material for the suction tube is mainly prepared from the following raw materials in parts by weight: 100-110 parts of polyvinyl alcohol, 6-30 parts of plasticizer and 0.5-6 parts of processing aid. The straw made of the straw material can be directly discarded in the nature after being used, can be degraded in the soil, can be dissolved in water and then degraded, does not influence resources, soil, environment and the like, and has remarkable environmental protection benefit and application value.
Description
Technical Field
The invention belongs to the technical field of straw materials, and particularly relates to application of a polyvinyl alcohol material, a straw material, a preparation method of the straw material and a straw.
Background
The straw is a common product in daily life of people, is generally a disposable plastic product, and can be divided into a food straw, a medical straw and a scientific research experiment straw. Taking a food straw as an example, the straw is a cylindrical hollow plastic product, and can be used for sucking various beverages and the like. At present, with the improvement of the living standard of people, various beverages are rich and colorful, and the drinking straws for food are used as matched food tools, so that the market demand is very large, and the plastic drinking straws used in the world annually at present are incompletely counted to be more than 50 ten thousand tons.
The existing disposable plastic straws mainly use Polyethylene (PE) as a raw material, and some of the plastic straws are supplemented with various color master batches, and the produced straws mainly use white stripes and various colors. However, the straw made of polyethylene as a main raw material is stable and not easy to degrade, and the straw can be degraded after being discarded in nature for at least 200 years, and is made of recyclable materials, but the straw is very small in size, light in weight and easy to ignore by recyclers, so that the straw not only can damage the soil structure, but also can cause serious white pollution. There are currently two main ways of handling such disposable pipettes: one is burning, the other is pushing and accumulating in the environment, self-generating and self-extinguishing; however, both treatment modes can cause environmental and ecological damage. In addition, the current polyethylene plastic suction pipe is high in recycling cost and has no operability.
Therefore, the research is carried out on preparing a novel material for the suction tube so as to solve the problems of difficult recovery, long degradation time and ecological environment and organism damage of the existing suction tube material, and the material has important significance and application value.
In view of this, the present invention has been made.
Disclosure of Invention
The first object of the present invention is to provide an application of polyvinyl alcohol material in preparing straw, which can alleviate the pollution problem to soil and environment by applying biodegradable polyvinyl alcohol material in straw field.
The second object of the present invention is to provide a material for a suction tube, which has good physical properties, is easy to degrade, can alleviate the pollution problem to soil and environment, and can overcome the above problems or at least partially solve the above technical problems.
The third object of the invention is to provide a preparation method of a material for a suction tube, which is simple, has strong operability and is easy to implement, and the prepared material for the suction tube can relieve the problems of environmental and soil pollution caused by difficult decomposition of the material for the suction tube in the prior art.
The fourth object of the present invention is to provide a straw, which is mainly made of the material for a straw, and can solve the problems of difficult decomposition of the material for the straw and environmental and soil pollution in the prior art.
In order to achieve the above purpose, the invention adopts the following technical scheme:
According to one aspect of the present invention there is provided the use of a polyvinyl alcohol material in the manufacture of a straw.
According to another aspect of the invention, the invention provides a material for a suction tube, which is mainly prepared from the following raw materials in parts by weight:
100-110 parts of polyvinyl alcohol, 6-30 parts of plasticizer and 0.5-6 parts of processing aid;
The polyvinyl alcohol comprises polyvinyl alcohol I with the polymerization degree less than 1500 and polyvinyl alcohol II with the polymerization degree more than or equal to 1500;
The mass fraction of the polyvinyl alcohol I in the polyvinyl alcohol is 0-50% and not including 0%, and the mass fraction of the polyvinyl alcohol II is 50-100% and not including 100%, calculated by the mass fraction of the polyvinyl alcohol being 100%.
As a further preferable technical scheme, the material is mainly prepared from the following raw materials in parts by weight:
100-108 parts of polyvinyl alcohol, 10-26 parts of plasticizer and 1-4 parts of processing aid;
the polyvinyl alcohol comprises polyvinyl alcohol I with the polymerization degree less than 1500 and polyvinyl alcohol II with the polymerization degree more than or equal to 1500.
As a further preferable technical scheme, the polyvinyl alcohol comprises polyvinyl alcohol I with the polymerization degree less than 1500 and the alcoholysis degree more than or equal to 85 percent and polyvinyl alcohol II with the polymerization degree more than or equal to 1500 and the alcoholysis degree more than or equal to 95 percent;
preferably, the polyvinyl alcohol comprises polyvinyl alcohol I with the polymerization degree of 500-1000 and the alcoholysis degree of more than or equal to 95 percent and polyvinyl alcohol II with the polymerization degree of 2000-3500 and the alcoholysis degree of more than or equal to 95 percent.
As a further preferable embodiment, the average particle diameter of the polyvinyl alcohol is 100 to 2000 μm, preferably 100 to 1000 μm;
and/or the ash content of the polyvinyl alcohol is less than or equal to 0.5%, preferably less than 0.3%;
and/or, the purity of the polyvinyl alcohol is greater than or equal to 90%, preferably greater than 92%.
As a further preferable embodiment, the plasticizer includes at least one of a low molecular weight polyol, a high molecular weight polyol, and a polyol ester;
Preferably, the plasticizer comprises at least one of ethanol, ethylene glycol, propylene glycol, glycerol, pentaerythritol, mannitol, sorbitol, glyceryl monoacetate, glyceryl diacetate, glyceryl triacetate, and triethylene glycol diisooctyl;
preferably, the plasticizer includes at least one of ethanol, ethylene glycol, propylene glycol, glycerol, and pentaerythritol, and at least one of mannitol, sorbitol, glyceryl monoacetate, glyceryl diacetate, glyceryl triacetate, and triethylene glycol diisooctyl ester.
As a further preferable technical scheme, the processing aid comprises at least one of a lubricant, an antioxidant and a heat stabilizer;
preferably, the processing aid is a lubricant;
Preferably, the lubricant is selected from polyethylene glycol with a polymerization degree of 200-2000, or polyethylene glycol compound formed by combining polyethylene glycols with several different molecular weights with a number average molecular weight of 200-2000.
As a further preferable technical scheme, the melting index of the material for the suction pipe is 3-15 g/10min, and the melting temperature is 120-250 ℃;
and/or the water-soluble temperature of the material for the suction pipe is more than or equal to 80 ℃.
According to another aspect of the present invention, there is provided a method for producing the above material for a suction tube, comprising the steps of:
Uniformly mixing the polyvinyl alcohol, the plasticizer and the processing aid according to the formula, and then extruding and granulating to obtain the material for the suction pipe.
As a further preferable technical scheme, firstly, adding polyvinyl alcohol into a high-speed stirrer, then adding a plasticizer and a processing aid into the high-speed stirrer, stirring, and discharging; then transferring into a double-screw extruder for extrusion granulation to obtain the material for the suction pipe;
Preferably, the stirring time is 1 to 35min, preferably 5 to 20min;
Preferably, the temperature of the discharged material is less than or equal to 30 ℃;
preferably, the melt index of the material for the suction pipe is 4-10 g/10min, and the melt temperature is 120-230 ℃;
and/or the water-soluble temperature of the material for the suction pipe is more than or equal to 80 ℃.
According to another aspect of the present invention, there is provided a straw, prepared from the material for a straw as described above.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention applies the polyvinyl alcohol material in the field of straw preparation, and can relieve the problems of difficult degradation, serious pollution to environment, ecology, soil and the like of the existing polyethylene straw material.
2. The material for the suction tube is mainly prepared from proper and proper amount of polyvinyl alcohol, plasticizer and processing aid, and has the advantages of high appearance transparency, no yellowing, excellent mechanical property, no generation of toxic and harmful substances in the thermoplastic processing process, excellent processing fluidity and good formability through the mutual coordination and support of the functions of the raw materials and the mutual restriction and collocation of the proportions. In addition, the material for the straw is a degradable material, is a safe, nontoxic and environment-friendly material, is beneficial to environmental protection, and solves the problem that the existing straw material is difficult to degrade and causes environmental pollution.
3. The preparation method has the advantages of simple and convenient process, strong controllable performance, short production period and low processing cost, and is easy to realize large-scale industrial production. Meanwhile, the invention has no three wastes in the whole production process, does not cause any pollution to the environment, and the material can be recycled, thereby saving resources, being low-carbon and environment-friendly.
4. The straw made of the straw material can be directly discarded in the nature after being used, can be degraded in soil, can be dissolved in water and then degraded, does not influence resources, soil, environment and the like, and has remarkable environmental protection benefit and application value.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to embodiments and examples, but it will be understood by those skilled in the art that the following embodiments and examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. The specific conditions are not specified, and the process is carried out according to conventional conditions or conditions suggested by manufacturers. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
It should be noted that:
In the present invention, all embodiments and preferred methods of implementation mentioned herein may be combined with each other to form new solutions, unless otherwise specified.
In the present invention, all technical features mentioned herein and preferred features may be combined with each other to form new technical solutions, unless otherwise specified.
In the present invention, the percentage (%) or parts refer to weight percentage or parts by weight relative to the composition unless otherwise specified.
In the present invention, the components or preferred components thereof may be combined with each other to form a new technical solution, unless otherwise specified.
In the present invention, unless otherwise indicated, the numerical ranges "a-b" represent shorthand representations of any combination of real numbers between a and b, where a and b are both real numbers. For example, the numerical range "6-30" means that all real numbers between "6-30" have been listed throughout, and "6-30" is only a shorthand representation of a combination of these values.
The "range" disclosed herein may take the form of a lower limit and an upper limit, which may be one or more lower limits and one or more upper limits, respectively.
In the present invention, each reaction or operation step may be performed sequentially or sequentially unless otherwise indicated. Preferably, the reaction processes herein are performed sequentially.
Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, any method or material similar or equivalent to those described may be used in the present invention.
In a first aspect, in at least one embodiment there is provided the use of a polyvinyl alcohol material in the manufacture of a straw.
Polyvinyl alcohol (polyvinyl alcohol, PVA for short) is a biodegradable polymer material with excellent performance and wide application, and has many excellent performances due to the structural characteristics of polyhydroxy and strong hydrogen bonds, so that the polyvinyl alcohol is widely applied to the fields of paint, adhesive, sanitation, chemical industry and the like. At present, many domestic and foreign researches are made on a processing method of polyvinyl alcohol, but prior to the application date of the application, related researches or reports on applying polyvinyl alcohol to the field of suction pipes have not been found yet. Based on the above, the inventor breaks the limitation of the conventional thinking of the person skilled in the art, develops a new way and creatively proposes to apply the polyvinyl alcohol to the field of straw materials, so that the straw material prepared mainly by taking the polyvinyl alcohol as a base material is expected to play an important role in replacing the traditional polyethylene straw material and preventing white pollution.
The invention applies the polyvinyl alcohol material in the field of straw preparation, and can relieve the problems of difficult degradation, serious pollution to environment, ecology, soil and the like of the existing polyethylene straw material. It should be understood that the polyvinyl alcohol material is prepared primarily from polyvinyl alcohol, plasticizers and processing aids.
In the embodiment of the present invention, the straw is mainly a food straw.
In a second aspect, in at least one embodiment, there is provided a material for a suction tube, which is prepared mainly from the following raw materials in parts by weight:
100-110 parts of polyvinyl alcohol, 6-30 parts of plasticizer and 0.5-6 parts of processing aid;
the polyvinyl alcohol comprises polyvinyl alcohol I with the polymerization degree less than 1500 and polyvinyl alcohol II with the polymerization degree more than or equal to 1500;
The mass fraction of the polyvinyl alcohol I in the polyvinyl alcohol is 0-50% and not including 0%, and the mass fraction of the polyvinyl alcohol II is 50-100% and not including 100%, calculated by the mass fraction of the polyvinyl alcohol as 100%.
The material for the suction pipe is mainly prepared from proper and proper amount of polyvinyl alcohol, plasticizer and processing aid, and through the mutual coordination and support of the functions of the raw materials and the mutual restriction and collocation of the proportions, the material has the advantages of high appearance transparency, no yellowing, excellent mechanical property, no generation of toxic and harmful substances in the thermoplastic processing process, excellent processing fluidity and good formability. In addition, the material for the suction tube is a degradable material, is a safe, nontoxic and environment-friendly material, is beneficial to environmental protection, and solves the problem that the existing polyethylene suction tube material is difficult to degrade and causes environmental pollution. Among them, polyvinyl alcohol is selected as a base material of the suction tube material, which can impart excellent comprehensive properties to the material, and the weight part of polyvinyl alcohol is 100 to 110 parts, and typically, but not limited to, the weight part of polyvinyl alcohol may be, for example, 100 parts, 101 parts, 102 parts, 103 parts, 104 parts, 105 parts, 106 parts, 107 parts, 108 parts, 109 parts or 110 parts. It should be noted that, the polyvinyl alcohol I and the polyvinyl alcohol II with different polymerization degrees are matched with each other, that is, the polyvinyl alcohol with lower polymerization degree and the polyvinyl alcohol with higher polymerization degree are matched for use, so that the raw materials with different polymerization degrees are matched, the synergistic effect is better, and the prepared material has good performance.
The polymerization degree of the polyvinyl alcohol I may be less than 1500, and may be 1400, 1200, 1000, 800, 600, 500, etc. The polymerization degree of the polyvinyl alcohol II may be 1500 or more, and may be 1500, 2000, 2500, 3000 or 3500, for example.
The ratio of the polyvinyl alcohol I to the polyvinyl alcohol II in the polyvinyl alcohol is also particularly limited.
The mass fraction of the polyvinyl alcohol I in the polyvinyl alcohol is 0-50% and not including 0%, and the mass fraction of the polyvinyl alcohol II is 50-100% and not including 100%, calculated by the mass fraction of the polyvinyl alcohol being 100%.
The limitation of the proportion is to ensure that the dosage of the polyvinyl alcohol I with low polymerization degree is smaller than or equal to that of the polyvinyl alcohol II with high polymerization degree, and if the polyvinyl alcohol I with low polymerization degree is higher (more than 50 percent), the water-soluble temperature of the material for the suction pipe can be influenced, so that the material can not meet the use requirement.
Typical, but non-limiting, mass fractions of polyvinyl alcohol I are 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45% or 50%. Typical, but non-limiting, mass fractions of polyvinyl alcohol ii are 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95% or 99%.
According to the invention, the addition of the plasticizer can reduce the melt processing temperature of the polyvinyl alcohol, reduce the strong action force of hydroxyl among molecules of the polyvinyl alcohol, further reduce the melting point of the polyvinyl alcohol material, improve the processing fluidity and make the material easier to process; in addition, the problem that the polyvinyl alcohol material is easy to yellow due to double bond generation can be relieved, the transparency or glossiness of the prepared material is improved, and the quality of the product is improved. The plasticizer is 6 to 22 parts by weight, and typically, but not limited to, the plasticizer may be 6 parts, 8 parts, 10 parts, 12 parts, 14 parts, 15 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 26 parts, 28 parts, or 30 parts, for example.
According to the invention, the addition of the processing aid can further improve the technical performance of the material for the suction pipe, improve the heat resistance, the ageing resistance and the like of the product, has good compatibility with the polyvinyl alcohol, and is beneficial to keeping the excellent physical properties of the product. The processing aid is typically, but not limited to, 0.5 to 6 parts by weight, and the processing aid may be, for example, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5 or 6 parts by weight.
All raw materials in the formula are food-grade raw materials except polyvinyl alcohol, the produced material can be used for extruding a disposable straw, and the material cannot be dissolved in normal temperature and hot water and can be gradually dissolved in boiling water, so that the problem of dissolution or precipitation of the material is not required in the use process.
In a preferred embodiment, the composition is prepared from the following raw materials in parts by weight:
100-108 parts of polyvinyl alcohol, 10-26 parts of plasticizer and 1-4 parts of processing aid;
the polyvinyl alcohol comprises polyvinyl alcohol I with the polymerization degree less than 1500 and polyvinyl alcohol II with the polymerization degree more than or equal to 1500.
The synergistic interaction between the components is fully exerted by reasonably adjusting and optimizing the dosage of each component in the material for the suction tube, the processing performance, physical performance or mechanical performance and other performances of the material are further improved, the quality of the product is improved, the effect of easy biodegradation is enhanced, and the environment protection is facilitated.
In a preferred embodiment, the polyvinyl alcohol comprises a polyvinyl alcohol I having a degree of polymerization of < 1500, an alcoholysis degree of not less than 85% and a polyvinyl alcohol II having a degree of polymerization of not less than 1500, an alcoholysis degree of not less than 95%.
Preferably, the polyvinyl alcohol comprises a polyvinyl alcohol I with a degree of polymerization of 500-1000, an alcoholysis degree of not less than 95% and a polyvinyl alcohol II with a degree of polymerization of 2000-3500, an alcoholysis degree of not less than 95%. The alcoholysis Degree (DH) and the polymerization Degree (DP) are main technical indexes of the polyvinyl alcohol, and the polyvinyl alcohol with different alcoholysis degrees and polymerization degrees has different performances and uses. According to the invention, the polyvinyl alcohol with different polymerization degrees is adopted as the base material, so that the polyvinyl alcohol can be ensured not to be dissolved in normal-temperature water and hot water.
The alcoholysis degree is not less than 85%, more preferably 88 to 99.5%, and may be, for example, 88%, 89%, 90%, 92%, 94%, 95%, 96%, 97%, 98%, 99% or 99.5%, typically but not limited thereto.
In a preferred embodiment, the average particle size of the polyvinyl alcohol is from 100 to 2000. Mu.m, preferably from 100 to 1000. Mu.m, and may be, for example, typically but not limited to, 100. Mu.m, 200. Mu.m, 300. Mu.m, 400. Mu.m, 500. Mu.m, 600. Mu.m, 800. Mu.m, 1000. Mu.m, 1200. Mu.m, 1500. Mu.m, 1800. Mu.m, or 2000. Mu.m. The polyvinyl alcohol with the particle size in the range can enable the material to be plasticized more easily in the production process, and the crystal points are not easy to generate.
In a preferred embodiment, the ash content of the polyvinyl alcohol is < 0.5%, preferably < 0.3%.
In a preferred embodiment, the purity of the polyvinyl alcohol is > 90%, preferably > 92%. Polyvinyl alcohol is typically, but not limited to, 90%, 92%, 94%, 95%, 96%, 98% pure, etc.
In a preferred embodiment, the plasticizer comprises at least one of a small molecular weight polyol, a large molecular weight polyol, and a polyol ester;
Preferably, the plasticizer comprises at least one of ethanol, ethylene glycol, propylene glycol, glycerol, pentaerythritol, mannitol, sorbitol, glyceryl monoacetate, glyceryl diacetate, glyceryl triacetate, and triethylene glycol diisooctyl;
preferably, the plasticizer includes at least one of ethanol, ethylene glycol, propylene glycol, glycerol, and pentaerythritol, and at least one of mannitol, sorbitol, glyceryl monoacetate, glyceryl diacetate, glyceryl triacetate, and triethylene glycol diisooctyl ester.
The plasticizer of the present invention is not particularly limited as long as the object of the present invention is not limited.
Preferably, the plasticizer is a food grade material comprising at least one of a water soluble low molecular weight polyol, a high molecular weight polyol and a polyol ester, preferably a compounded plasticizer. It is understood that the "low molecular weight polyol" refers to a polyol having a carbon number of 4 or less (C4 or less), and the "high molecular weight polyol" refers to a polyol having a carbon number of > 4.
More preferably, the plasticizer is compounded by using the low-molecular-weight polyol and the high-molecular-weight polyol or polyol ester, so that the raw materials with different molecular weights are matched, the synergistic effect is better, and the effect of the plasticizer can be exerted. Preferably, the plasticizer is at least one of ethanol, ethylene glycol, propylene glycol, glycerol and pentaerythritol, and is used in combination with at least one of mannitol, sorbitol, monoacetin, diacetin, triacetin and triethylene glycol diisooctyl.
In a preferred embodiment, the processing aid comprises at least one of a lubricant, an antioxidant, and a heat stabilizer;
preferably, the processing aid is a lubricant;
Preferably, the lubricant is selected from polyethylene glycol with a polymerization degree of 200-2000, or polyethylene glycol compound formed by combining polyethylene glycols with several different molecular weights with a number average molecular weight of 200-2000.
The processing aid of the present invention is not particularly limited as long as the object of the present invention is not limited.
It will be appreciated that the processing aid may include, in addition to the lubricant, other types of processing aids commonly used in the art, such as antioxidants, etc., and the invention is not limited in particular.
Preferably, the processing aid is mainly a lubricant used in processing, the lubricant is mainly food-grade polyethylene glycol, the number average molecular weight of the lubricant is 200-2000, polyethylene glycol with one number average molecular weight or polyethylene glycol compound can be adopted, and the polyethylene glycol compound is formed by combining two or more polyethylene glycols with different number average molecular weights. Typically, but not by way of limitation, the lubricant is selected from one or more of polyethylene glycol 200 (referring to polyethylene glycol having a number average molecular weight of 200, hereinafter the same), polyethylene glycol 300, polyethylene glycol 400, polyethylene glycol 600, polyethylene glycol 800, polyethylene glycol 1000, polyethylene glycol 1500, polyethylene glycol 1800, and polyethylene glycol 2000. Thus, the use of this type of lubricant can reduce precipitation in the water-soluble product.
In a preferred embodiment, the material for a suction tube has a melt index of 3 to 15g/10min and a melting temperature of 120 to 250 ℃;
and/or the water-soluble temperature of the material for the suction pipe is more than or equal to 80 ℃.
The melt index of the material for a suction tube was 3 to 15g/10min (190 ℃ C., 2.16 kg). The water-soluble temperature is more than or equal to 80 ℃ and means that the material can be dissolved in water with the temperature of more than 80 ℃. The decomposition temperature of the material is above 250 ℃, the material is colorless and transparent, does not yellow, and has excellent quality and performance.
Therefore, the material for a suction tube of the present invention is insoluble in normal temperature and hot water, and is gradually soluble in boiling water, that is, water at 80 ℃ or higher, and therefore there is no concern about dissolution or precipitation of the material in use.
In a third aspect, in at least one embodiment, there is provided a method for preparing a material for a suction tube, comprising the steps of:
Uniformly mixing the polyvinyl alcohol, the plasticizer and the processing aid according to the formula, and then extruding and granulating to obtain the material for the suction pipe.
The preparation method of the material for the suction tube has the advantages of simple operation, easy implementation, capability of obtaining the material or the product for the suction tube through one-time melt extrusion, granulation or direct molding after fully and uniformly mixing the raw materials, strong controllability, short production period and easy realization of industrialization.
In a preferred embodiment, the polyvinyl alcohol is added to a high speed mixer, and then the plasticizer and the processing aid are added to the high speed mixer, stirred and discharged; then transferring into a double-screw extruder for extrusion granulation to obtain the material for the suction pipe;
Preferably, the stirring time is 1 to 35min, preferably 5 to 20min;
Preferably, the temperature of the discharged material is less than or equal to 30 ℃;
preferably, the melt index of the material for the suction pipe is 3-15 g/10min, and the melt temperature is 120-250 ℃;
and/or the water-soluble temperature of the material for the suction pipe is more than or equal to 80 ℃.
The preparation method of the material for the suction tube, which is a preferable material for the suction tube, comprises the following steps: and after weighing the components according to the parts by weight, firstly adding the polyvinyl alcohol into a high-speed stirrer, starting low-speed stirring, then starting high-speed stirring, slowly adding the plasticizer and other auxiliary agents, continuously stirring for 10-30 minutes after all the components are added, or continuously stirring for 10-30 minutes after the components are stirred at high speed for 1-2 minutes, cooling to below 30 ℃, discharging, and granulating by a double-screw extruder to obtain the water-soluble material for the suction pipe.
The specific operating conditions of the twin-screw extruder are not particularly limited, and can be regulated and controlled by a person skilled in the art according to actual conditions.
In a fourth aspect, in at least one embodiment, a straw is provided, made primarily from the straw material described above.
The straw made of the straw material can be directly discarded in the nature after being used, can be degraded in soil, can be dissolved in water and then degraded, does not influence resources, soil, environment and the like, and has remarkable environmental protection benefit and application value.
It should be understood that the details of the preparation method or the prepared product are not described in detail in the description, and are common parameters that are easily understood by those skilled in the art, and may be adjusted and controlled by those skilled in the art according to actual situations, such as stirring rotation speed, temperature, etc., so that the detailed description thereof may be omitted.
The technical scheme of the present invention will be further described in detail below in conjunction with specific examples and comparative examples for understanding by those skilled in the art.
Example 1
The material for the suction pipe is mainly prepared from the following raw materials in parts by weight:
60 parts of polyvinyl alcohol II (polymerization degree 3500, alcoholysis degree 99%, average particle diameter 100 μm), 40 parts of polyvinyl alcohol I (polymerization degree 500, alcoholysis degree 99%, average particle diameter 100 μm), 8 parts of sorbitol, 14 parts of glycerol and 1 part of polyethylene glycol (polyethylene glycol 400) having a molecular weight of 400.
The preparation method of the material for the suction pipe comprises the following steps:
60kg of polyvinyl alcohol II (polymerization degree 3500, alcoholysis degree 99%, average particle diameter 100 μm) and 40kg of polyvinyl alcohol I (polymerization degree 500, alcoholysis degree 99%, average particle diameter 100 μm) were weighed and mixed at high speed in a high-speed mixer for 2 minutes, then 8kg of sorbitol, 14kg of glycerol and 1kg of polyethylene glycol 400 were slowly added, and after all the above addition, high-speed mixing was continued for 10 minutes, and the temperature was lowered to 30℃and discharged. Adding the obtained powder into a double-screw extruder, setting the processing temperature at 120 ℃/140 ℃/150 ℃/160 ℃/170 ℃/180 ℃/200 ℃/190 ℃/190 ℃/190 ℃/180 ℃, and extruding and granulating to obtain the material for the suction pipe.
Wherein, the processing temperatures are respectively indicated as temperatures of one zone/two zone/three zone/four zone/five zone/six zone/seven zone/eight zone/nine zone/ten zone/machine head (the same applies below).
Example 2
The material for the suction pipe is mainly prepared from the following raw materials in parts by weight:
70 parts of polyvinyl alcohol II (degree of polymerization 2000, degree of alcoholysis 99%, average particle diameter 500 μm), 30 parts of polyvinyl alcohol I (degree of polymerization 800, degree of alcoholysis 95%, average particle diameter 500 μm), 4 parts of sorbitol, 11 parts of glycerol, 7 parts of propylene glycol and 3 parts of polyethylene glycol (polyethylene glycol 1000) with molecular weight of 1000.
The preparation method of the material for the suction pipe comprises the following steps:
70kg of polyvinyl alcohol II (polymerization degree 2000, alcoholysis degree 99%, average particle diameter 500 μm) and 30kg of polyvinyl alcohol I (polymerization degree 800, alcoholysis degree 95%, average particle diameter 500 μm) were weighed and mixed at high speed in a high-speed mixer for 2 minutes, then 11kg of glycerol, 7kg of propylene glycol, 4kg of sorbitol and 3kg of polyethylene glycol 1000 were slowly added, and after all the above addition, high-speed mixing was continued for 15 minutes, and the temperature was lowered to 30℃and discharged. Adding the obtained powder into a double-screw extruder, setting the processing temperature at 120 ℃/140 ℃/150 ℃/160 ℃/170 ℃/180 ℃/200 ℃/190 ℃/190 ℃/190 ℃/180 ℃, and extruding and granulating to obtain the material for the suction pipe.
Example 3
The material for the suction pipe is mainly prepared from the following raw materials in parts by weight:
60 parts of polyvinyl alcohol II (degree of polymerization 2500, degree of alcoholysis 99%, average particle diameter 500 μm), 40 parts of polyvinyl alcohol I (degree of polymerization 800, degree of alcoholysis 95%, average particle diameter 500 μm), 10 parts of glyceryl triacetate, 3 parts of triethylene glycol diisocaprylate, 7 parts of ethylene glycol and 5 parts of polyethylene glycol (polyethylene glycol 2000) with molecular weight of 2000.
The preparation method of the material for the suction pipe comprises the following steps:
60kg of polyvinyl alcohol II (degree of polymerization 2500, degree of alcoholysis 99%, average particle diameter 500 μm) and 40kg of polyvinyl alcohol I (degree of polymerization 800, degree of alcoholysis 95%, average particle diameter 500 μm) were weighed and mixed at high speed in a high-speed mixer for 2 minutes, then 10kg of glyceryl triacetate, 3kg of triethylene glycol diisooctyl, 7kg of ethylene glycol and 5kg of polyethylene glycol 2000 were slowly added, and after all the above, the mixture was mixed at high speed for 15 minutes, and the mixture was cooled to 30℃and discharged. Adding the obtained powder into a double-screw extruder, setting the processing temperature at 120 ℃/130 ℃/140 ℃/150 ℃/150 ℃/140 ℃/140 ℃/135 ℃/130 ℃/130 ℃ and extruding and granulating to obtain the material for the suction pipe.
Example 4
The material for the suction pipe is mainly prepared from the following raw materials in parts by weight:
70 parts of polyvinyl alcohol II (polymerization degree 3500, alcoholysis degree 99%, average particle diameter 1000 μm), 30 parts of polyvinyl alcohol I (polymerization degree 500, alcoholysis degree 99%, average particle diameter 500 μm), 12 parts of mannitol, 10 parts of pentaerythritol and 2 parts of polyethylene glycol (polyethylene glycol 800) with molecular weight 800.
The preparation method of the material for the suction pipe comprises the following steps:
70kg of polyvinyl alcohol II (polymerization degree 3000, alcoholysis degree 99%, average particle size 1000 μm) and 30kg of polyvinyl alcohol I (polymerization degree 600, alcoholysis degree 99%, average particle size 500 μm) were weighed and mixed in a high-speed mixer at high speed for 2 minutes, then 12kg of mannitol, 10kg of pentaerythritol and 2kg of polyethylene glycol 800 were slowly added, and after all the above-mentioned materials were added, the mixture was continuously mixed at high speed for 20 minutes, and the temperature was lowered to 30 ℃ and discharged. Adding the obtained powder into a double-screw extruder, setting the processing temperature at 120 ℃/140 ℃/150 ℃/160 ℃/170 ℃/180 ℃/190 ℃/190 ℃/185 ℃/180 ℃/170 ℃, and extruding and granulating to obtain the material for the suction pipe.
Example 5
The material for the suction pipe is mainly prepared from the following raw materials in parts by weight:
50 parts of polyvinyl alcohol II (polymerization degree 1500, alcoholysis degree 95%, average particle diameter 1000 μm), 50 parts of polyvinyl alcohol I (polymerization degree 400, alcoholysis degree 95%, average particle diameter 2000 μm), 6 parts of ethylene glycol, 5 parts of glycerol, 8 parts of glyceryl monoacetate and 4 parts of polyethylene glycol (polyethylene glycol 1500) with molecular weight of 1500.
The preparation method of the material for the suction pipe comprises the following steps:
50kg of polyvinyl alcohol II (polymerization degree: 1500, alcoholysis degree: 95%, average particle diameter: 1000 μm) and 50kg of polyvinyl alcohol I (polymerization degree: 400, alcoholysis degree: 95%, average particle diameter: 2000 μm) were weighed and mixed in a high-speed mixer at high speed for 2 minutes, 6kg of ethylene glycol, 5kg of glycerol, 8kg of glyceryl monoacetate and 4kg of polyethylene glycol were slowly added, and after all the addition, high-speed mixing was continued for 20 minutes, and the temperature was lowered to 30℃and discharged. Adding the obtained powder into a double-screw extruder, setting the processing temperature at 120 ℃/130 ℃/150 ℃/150 ℃/160 ℃/160 ℃/160 ℃/170 ℃/180 ℃/180 ℃/180 ℃/170 ℃/170 ℃, and extruding and granulating to obtain the material for the suction pipe.
Example 6
A material for a suction pipe was the same as in example 1 except that 60 parts by weight of polyvinyl alcohol II in example 1 was replaced with 80 parts by weight, and 40 parts by weight of polyvinyl alcohol I was replaced with 20 parts by weight.
The preparation method of the material for a suction tube is the same as in example 1.
Example 7
A material for a suction pipe was the same as in example 1 except that the polymerization degree 3500 of polyvinyl alcohol II in example 1 was replaced with a polymerization degree 2000.
The preparation method of the material for a suction tube is the same as in example 1.
Comparative example 1
The material for the suction pipe is mainly prepared from the following raw materials in parts by weight:
100 parts of polyvinyl alcohol (polymerization degree 300, alcoholysis degree 88%, average particle diameter 50 μm), 20 parts of sorbitol, 10 parts of glycerol and 10 parts of polyethylene glycol (polyethylene glycol 2500) with molecular weight 2500.
The preparation method of the material for a suction tube is the same as in example 1.
Comparative example 2
The material for the suction pipe is mainly prepared from the following raw materials in parts by weight:
100 parts of polyvinyl alcohol (polymerization degree 3500, alcoholysis degree 88%, average particle diameter 2500 μm), 8 parts of sorbitol, 10 parts of glycerol and 3 parts of polyethylene glycol (polyethylene glycol 400) having a molecular weight of 400.
The preparation method of the material for a suction tube is the same as in example 1.
Comparative example 3
A material for a suction pipe was the same as in example 1 except that 60 parts of polyvinyl alcohol II and 40 parts of polyvinyl alcohol I in example 1 were replaced with 100 parts of polyvinyl alcohol II.
The preparation method of the material for a suction tube is the same as in example 1.
Comparative example 4
A material for a suction pipe was the same as in example 1 except that 60 parts of polyvinyl alcohol II and 40 parts of polyvinyl alcohol I in example 1 were replaced with 100 parts of polyvinyl alcohol I.
The preparation method of the material for a suction tube is the same as in example 1.
Comparative example 5
A material for a suction pipe was the same as in example 1 except that the polymerization degree 500 of polyvinyl alcohol I in example 1 was replaced with the polymerization degree 2000.
The preparation method of the material for a suction tube is the same as in example 1.
Comparative example 6
A material for a suction pipe was the same as in example 1 except that 60 parts of polyvinyl alcohol II in example 1 was replaced with 20 parts and 40 parts of polyvinyl alcohol I was replaced with 80 parts of polyvinyl alcohol II.
The preparation method of the material for a suction tube is the same as in example 1.
Comparative example 7
A material for a suction tube is a polypropylene material.
Performance testing
The materials for pipettes prepared in each of the examples and comparative examples were subjected to performance tests including appearance, melt index, water-soluble temperature, etc., and the test results are shown in Table 1.
Wherein, melt index: test standard ASTM D1238-04, test conditions: 190 ℃,2.16kg.
The detection method of the water-soluble temperature comprises the following steps: filling 800mL of water in the beaker, keeping the temperature in a water bath or an oil bath to 20 ℃, and adjusting the magnetic stirring speed to 200r/min to ensure the water temperature in the beaker to be uniform; the sample is clamped by a square clamp with the length of 6cm and 6cm, the sample and the sample clamp are completely immersed in water, heating is started until the sample is completely dissolved, and the lowest temperature of the complete dissolution of the sample is recorded and is used as the water dissolution temperature of the test material.
TABLE 1 Performance test results
From table 1 above, it can be seen that the test results of the examples can basically meet the extrusion performance requirements of the pipettes, the color can be adjusted by adding color master batch and the like, and the water-soluble temperatures of comparative examples 1, 2, 4 and 6 are lower and cannot meet the use requirements of the pipettes. The melt index of comparative example 3 and comparative example 5 was low, the flowability of the extrusion-produced straws was too poor, scorching was easy, and molding was not easy.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (11)
1. The material for the suction tube with the melting temperature of 120-250 ℃ and the water-soluble temperature of more than or equal to 80 ℃ is characterized by being prepared from the following raw materials in parts by weight:
100-108 parts of polyvinyl alcohol, 10-26 parts of plasticizer and 1-4 parts of processing aid;
The polyvinyl alcohol comprises polyvinyl alcohol I with the polymerization degree of 500-1000 and the alcoholysis degree of more than or equal to 95 percent, and polyvinyl alcohol II with the polymerization degree of 2000-3500 and the alcoholysis degree of more than or equal to 95 percent;
The mass fraction of the polyvinyl alcohol I in the polyvinyl alcohol is 0-50% and not including 0%, and the mass fraction of the polyvinyl alcohol II is 50-100% and not including 100%, calculated by the mass fraction of the polyvinyl alcohol being 100%;
The plasticizer comprises at least one of ethanol, ethylene glycol, propylene glycol, glycerol and pentaerythritol, and at least one of mannitol, sorbitol, glyceryl monoacetate, glyceryl diacetate, glyceryl triacetate and triethylene glycol diisooctyl;
The processing aid is a lubricant; the lubricant is selected from polyethylene glycol with polymerization degree of 200-2000, or polyethylene glycol compound formed by combining polyethylene glycols with different molecular weights and number average molecular weight of 200-2000.
2. The material for a suction tube according to claim 1, wherein the average particle diameter of the polyvinyl alcohol is 100 to 2000 μm;
And/or the ash content of the polyvinyl alcohol is less than or equal to 0.5%;
and/or the purity of the polyvinyl alcohol is more than or equal to 90 percent.
3. The material for a suction tube according to claim 2, wherein the average particle diameter of the polyvinyl alcohol is 100 to 1000 μm;
And/or, the ash content of the polyvinyl alcohol is < 0.3%;
And/or, the purity of the polyvinyl alcohol is > 92%.
4. The material for a suction tube according to claim 1, wherein the melt index of the material for a suction tube is 3 to 15g/10min.
5. The method for producing a material for a suction tube according to any one of claims 1 to 4, comprising the steps of:
uniformly mixing polyvinyl alcohol, plasticizer and processing aid in a formula amount, and then extruding and granulating to obtain the material for the suction pipe;
The melting temperature of the material for the suction pipe is 120-250 ℃, and the water-soluble temperature of the material for the suction pipe is more than or equal to 80 ℃.
6. The method for producing a material for a suction pipe according to claim 5, wherein the polyvinyl alcohol is added to a high-speed mixer, and the plasticizer and the processing aid are added to the high-speed mixer, stirred, and discharged; and then transferring into a double-screw extruder for extrusion granulation to obtain the material for the suction pipe.
7. The method for producing a material for a suction tube according to claim 6, wherein the stirring time is 1 to 35 minutes.
8. The method for producing a material for a suction pipe according to claim 7, wherein the stirring time is 5 to 20 minutes.
9. The method for producing a material for a suction pipe according to claim 6, wherein the temperature of the discharged material is 30 ℃ or less.
10. The method for producing a material for a suction tube according to claim 6, wherein the melt index of the material for a suction tube is 3 to 15g/10min.
11. A straw, characterized in that it is mainly prepared from the material for straw according to any one of claims 1 to 4.
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