CN114381080A - Application of polyvinyl alcohol material, material for straw, preparation method of material and straw - Google Patents
Application of polyvinyl alcohol material, material for straw, preparation method of material and straw Download PDFInfo
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- CN114381080A CN114381080A CN202210253397.XA CN202210253397A CN114381080A CN 114381080 A CN114381080 A CN 114381080A CN 202210253397 A CN202210253397 A CN 202210253397A CN 114381080 A CN114381080 A CN 114381080A
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- polyvinyl alcohol
- straw
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- 229920002451 polyvinyl alcohol Polymers 0.000 title claims abstract description 163
- 239000004372 Polyvinyl alcohol Substances 0.000 title claims abstract description 159
- 239000000463 material Substances 0.000 title claims abstract description 155
- 239000010902 straw Substances 0.000 title claims abstract description 120
- 238000002360 preparation method Methods 0.000 title abstract description 24
- 239000004014 plasticizer Substances 0.000 claims abstract description 35
- 239000006057 Non-nutritive feed additive Substances 0.000 claims abstract description 30
- 239000002994 raw material Substances 0.000 claims abstract description 24
- 238000006116 polymerization reaction Methods 0.000 claims description 63
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 45
- 238000006136 alcoholysis reaction Methods 0.000 claims description 37
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 33
- 229920001223 polyethylene glycol Polymers 0.000 claims description 28
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims description 27
- 239000002245 particle Substances 0.000 claims description 25
- 239000002202 Polyethylene glycol Substances 0.000 claims description 24
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 21
- 229920005862 polyol Polymers 0.000 claims description 19
- URAYPUMNDPQOKB-UHFFFAOYSA-N triacetin Chemical compound CC(=O)OCC(OC(C)=O)COC(C)=O URAYPUMNDPQOKB-UHFFFAOYSA-N 0.000 claims description 18
- -1 polyol ester Chemical class 0.000 claims description 17
- KMZHZAAOEWVPSE-UHFFFAOYSA-N 2,3-dihydroxypropyl acetate Chemical compound CC(=O)OCC(O)CO KMZHZAAOEWVPSE-UHFFFAOYSA-N 0.000 claims description 14
- 239000000314 lubricant Substances 0.000 claims description 14
- 150000003077 polyols Chemical class 0.000 claims description 14
- 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 13
- 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 13
- 239000000600 sorbitol Substances 0.000 claims description 13
- 238000002844 melting Methods 0.000 claims description 12
- 230000008018 melting Effects 0.000 claims description 12
- 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 10
- 229930195725 Mannitol Natural products 0.000 claims description 10
- 239000000594 mannitol Substances 0.000 claims description 10
- 235000010355 mannitol Nutrition 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 9
- 235000013773 glyceryl triacetate Nutrition 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 claims description 9
- 229960002622 triacetin Drugs 0.000 claims description 9
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 claims description 9
- 238000001125 extrusion Methods 0.000 claims description 8
- 238000005469 granulation Methods 0.000 claims description 8
- 230000003179 granulation Effects 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 150000001875 compounds Chemical class 0.000 claims description 7
- 239000001087 glyceryl triacetate Substances 0.000 claims description 6
- 239000004348 Glyceryl diacetate Substances 0.000 claims description 4
- 239000003963 antioxidant agent Substances 0.000 claims description 4
- 235000019443 glyceryl diacetate Nutrition 0.000 claims description 4
- UXDDRFCJKNROTO-UHFFFAOYSA-N Glycerol 1,2-diacetate Chemical compound CC(=O)OCC(CO)OC(C)=O UXDDRFCJKNROTO-UHFFFAOYSA-N 0.000 claims description 3
- 230000003078 antioxidant effect Effects 0.000 claims description 3
- 239000012760 heat stabilizer Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 15
- 239000002689 soil Substances 0.000 abstract description 12
- 230000007613 environmental effect Effects 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 5
- 230000000704 physical effect Effects 0.000 abstract description 3
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 135
- 238000012545 processing Methods 0.000 description 15
- 239000004698 Polyethylene Substances 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 11
- 229920000573 polyethylene Polymers 0.000 description 11
- 238000012360 testing method Methods 0.000 description 7
- 229920003023 plastic Polymers 0.000 description 6
- 239000004033 plastic Substances 0.000 description 6
- 239000000155 melt Substances 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000035622 drinking Effects 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
- 230000000694 effects Effects 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
- 230000002195 synergetic effect Effects 0.000 description 3
- 238000009835 boiling Methods 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000009775 high-speed stirring Methods 0.000 description 2
- 231100000252 nontoxic Toxicity 0.000 description 2
- 230000003000 nontoxic effect Effects 0.000 description 2
- 229940093430 polyethylene glycol 1500 Drugs 0.000 description 2
- 238000003900 soil pollution Methods 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
- 238000005303 weighing Methods 0.000 description 2
- 238000004383 yellowing Methods 0.000 description 2
- 239000004743 Polypropylene Substances 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
- 235000013361 beverage Nutrition 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
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 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
- 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
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000011056 performance test Methods 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
- 239000002195 soluble material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000003017 thermal stabilizer Substances 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- 239000002699 waste material Substances 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
Abstract
The invention belongs to the technical field of straw materials, and relates to an 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 straw. The material for the straw 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 material has good physical properties, is easy to degrade, can relieve the pollution problem caused to soil and environment, can be directly discarded in the nature after being used, can be degraded in the soil, can be degraded after being dissolved in water, cannot influence resources, soil, environment and the like, and has obvious environmental protection benefit and application value.
Description
Technical Field
The invention belongs to the technical field of straw materials, and particularly relates to an 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 straw for food, a medical straw and a straw for scientific research and experiments. Taking a straw for food as an example, the straw is generally a cylindrical hollow plastic product, and can be used for sucking various drinks and the like. At present, with the improvement of living standard of people, various beverages are rich and colorful, and the food straw is matched with a catering tool for use, so that the market demand is very large, and the incomplete statistics on the plastic straws used in every year all over the world at present is more than 50 ten thousand tons.
The prior disposable plastic suction pipe mainly takes Polyethylene (PE) as a raw material, some of the Polyethylene (PE) is supplemented with master batches with various colors, and the produced suction pipe mainly takes white stripes and various colors. However, the straw made of polyethylene as the main raw material is stable and not easy to degrade, and can be degraded only after being discarded in nature for at least 200 years, although the straw is made of recyclable materials, the straw is very easy to neglect by a recycler due to the fact that the straw is small in volume and light in weight, so that not only the soil structure is damaged, but also serious white pollution is caused. There are two main ways of handling such disposable straws: one is burning, and the other is pushing and accumulating in the environment, and self-generating and self-extinguishing; however, both of these treatments are harmful to the environment and ecology. In addition, the recycling cost of the current polyethylene plastic suction pipe is high, and the polyethylene plastic suction pipe is not operable.
Therefore, the research and preparation of the novel material for the straw are used for relieving the problems of difficult recovery, long degradation time and damage to ecological environment and organisms of the conventional straw material, and have important significance and application value.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The invention aims to provide an application of a polyvinyl alcohol material in the preparation of a straw, and the biodegradable polyvinyl alcohol material is applied to the field of straws, so that the pollution problem to soil and environment can be relieved.
A second object of the present invention is to provide a material for suction pipes, which has good physical properties, is easily degradable, can alleviate the problem of pollution to soil and environment, and can overcome the above problems or at least partially solve the above technical problems.
The third purpose of the invention is to provide a preparation method of the material for the suction pipe, which is simple, strong in operability and easy to implement, and the prepared material for the suction pipe can relieve the problem that the material for the suction pipe is difficult to decompose and causes environmental and soil pollution in the prior art.
The fourth purpose of the invention is to provide a straw which is mainly made of the straw material, and can relieve the problem that the straw material is difficult to decompose and causes environmental and soil pollution in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that:
according to one aspect of the present invention, there is provided the use of a polyvinyl alcohol material in the manufacture of a drinking straw.
According to another aspect of the invention, the invention provides a material for a suction pipe, 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;
based on the mass fraction of the polyvinyl alcohol as 100%, the mass fraction of the polyvinyl alcohol I in the polyvinyl alcohol is 0-50% and does not include 0%, and the mass fraction of the polyvinyl alcohol II is 50-100% and does not include 100%.
As a further preferable technical scheme, the compound 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 preferred technical scheme, the polyvinyl alcohol comprises polyvinyl alcohol I with the polymerization degree of less than 1500 and the alcoholysis degree of more than or equal to 85 percent and polyvinyl alcohol II with the polymerization degree of more than or equal to 1500 and the alcoholysis degree of 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% and polyvinyl alcohol II with the polymerization degree of 2000-3500 and the alcoholysis degree of more than or equal to 95%.
In a further preferable technical scheme, the average particle size of the polyvinyl alcohol is 100-2000 μm, and is preferably 100-1000 μm;
and/or the ash content of the polyvinyl alcohol is less than or equal to 0.5 percent, preferably less than 0.3 percent;
and/or the purity of the polyvinyl alcohol is more than or equal to 90 percent, and preferably more than 92 percent.
As a further preferred embodiment, the plasticizer includes 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, glycerol monoacetate, glycerol diacetate, glycerol triacetate, and triethylene glycol diisocaprylate;
preferably, the plasticizer comprises at least one of ethanol, ethylene glycol, propylene glycol, glycerol and pentaerythritol, and at least one of mannitol, sorbitol, monoacetin, diacetin, triacetin and triethylene glycol diisocaprylate.
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 the polymerization degree of 200-2000, or a polyethylene glycol compound formed by combining several polyethylene glycols with different molecular weights and the number average molecular weight of 200-2000.
According to a further preferable technical scheme, the melt index of the material for the straw is 3-15 g/10min, and the melting temperature is 120-250 ℃;
and/or the water-soluble temperature of the material for the suction tube is more than or equal to 80 ℃.
According to another aspect of the present invention, there is provided a method for preparing the above material for straw, comprising the steps of:
firstly, uniformly mixing the polyvinyl alcohol, the plasticizer and the processing aid according to the formula ratio, and then carrying out extrusion granulation to obtain the material for the straw.
As a further preferred 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 the mixture into a double-screw extruder for extrusion granulation to obtain the material for the suction pipe;
preferably, the stirring time is 1-35 min, preferably 5-20 min;
preferably, the temperature of discharging is less than or equal to 30 ℃;
preferably, the melting index of the material for the suction pipe is 4-10 g/10min, and the melting temperature is 120-230 ℃;
and/or the water-soluble temperature of the material for the suction tube is more than or equal to 80 ℃.
According to another aspect of the present invention, there is provided a drinking straw, made primarily of the material for drinking straws 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 preparing the straw, and can relieve the problems that the existing polyethylene straw material is not easy to degrade and causes serious pollution to the environment, the ecology, the soil and the like.
2. The material for the suction pipe is mainly prepared from proper and proper amounts of polyvinyl alcohol, plasticizer and processing aid, and the raw materials are matched and supported in function and are restricted and matched in proportion, so that the material is high in appearance transparency, free of yellowing, excellent in mechanical property, free of toxic and harmful substances in the thermoplastic processing process, excellent in processing flowability and good in formability. In addition, the material for the straw is a degradable material, is a safe, non-toxic, green and environment-friendly material, is beneficial to environmental protection, and solves the problem that the existing straw material is difficult to degrade to cause environmental pollution.
3. The preparation method has the advantages of simple and convenient process, strong controllability, short production period, low processing cost and easy realization of large-scale industrial production. Meanwhile, the invention has no three wastes in the whole production process, does not cause any pollution to the environment, can recycle the materials, saves resources, and is low-carbon and environment-friendly.
4. The straw made of the straw material can be directly discarded in nature after use, can be degraded in soil and can be degraded after being dissolved in water, so that the straw material does not affect resources, soil, environment and the like, and has obvious 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 those skilled in the art will understand that the following embodiments and examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Those who do not specify the conditions are performed according to the conventional conditions or the conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
It should be noted that:
in the present invention, all the embodiments and preferred methods mentioned herein can be combined with each other to form a new technical solution, if not specifically stated.
In the present invention, all the technical features mentioned herein and preferred features may be combined with each other to form a new technical solution, if not specifically stated.
In the present invention, the percentage (%) or parts means the weight percentage or parts by weight with respect to the composition, if not otherwise specified.
In the present invention, the components referred to or the preferred components thereof may be combined with each other to form a novel embodiment, if not specifically stated.
In the present invention, unless otherwise stated, the numerical range "a-b" represents a shorthand representation of any combination of real numbers between a and b, where a and b are both real numbers. For example, a numerical range of "6 to 30" means that all real numbers between "6 to 30" have been listed herein, and "6 to 30" is only a shorthand representation of the combination of these values.
The "ranges" disclosed herein may have one or more lower limits and one or more upper limits, respectively, in the form of lower limits and upper limits.
In the present invention, unless otherwise specified, the individual reactions or operation steps may be performed sequentially or may be performed in sequence. Preferably, the reaction processes herein are carried out sequentially.
Unless otherwise defined, technical and scientific terms used herein have the same meaning as is familiar to those skilled in the art. In addition, any methods or materials similar or equivalent to those described herein can also be used in the present invention.
In a first aspect, there is provided in at least one embodiment a use of a polyvinyl alcohol material in the manufacture of a drinking straw.
Polyvinyl alcohol (PVA) 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 coatings, adhesives, sanitation, chemical industry and the like. At present, most of domestic and foreign researches are on processing methods of polyvinyl alcohol, and related researches or reports on application of polyvinyl alcohol in the field of straws before the application date of the application are not found. Based on the above, the inventor breaks through the conventional thinking of the technicians in the field, develops a new way, and creatively proposes to apply the polyvinyl alcohol in the field of straw materials, so that the straw material mainly prepared by taking the polyvinyl alcohol as the 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 preparing the straw, and can relieve the problems that the existing polyethylene straw material is not easy to degrade and causes serious pollution to the environment, the ecology, the soil and the like. It should be understood that the polyvinyl alcohol material is prepared primarily from polyvinyl alcohol, a plasticizer, and a processing aid.
In the embodiment of the present invention, the straw is mainly a straw for food.
In a second aspect, in at least one embodiment, there is provided a material for a straw, which is 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 0%, and the mass fraction of the polyvinyl alcohol II is 50-100% and not 100%, based on the mass fraction of the polyvinyl alcohol as 100%.
The material for the straw is mainly prepared from proper and proper amounts of polyvinyl alcohol, plasticizer and processing aid, and through the mutual matching and supporting of the functions of the raw materials and the mutual restriction and matching 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 flowability and good formability. In addition, the material for the straw is a degradable material, is a safe, non-toxic, green and environment-friendly material, is beneficial to environmental protection, and solves the problem that the existing polyethylene straw material is difficult to degrade and causes environmental pollution. The material has excellent comprehensive performance, and the polyvinyl alcohol is selected as a base material of the material for the suction pipe, wherein the polyvinyl alcohol accounts for 100-110 parts by weight, and typically but not by limitation, the polyvinyl alcohol can account for 100 parts, 101 parts, 102 parts, 103 parts, 104 parts, 105 parts, 106 parts, 107 parts, 108 parts, 109 parts or 110 parts by weight. It should be noted that polyvinyl alcohol i and polyvinyl alcohol ii with different degrees of polymerization need to be used in cooperation, that is, polyvinyl alcohol with a lower degree of polymerization and polyvinyl alcohol with a higher degree of polymerization are used in cooperation, so that the collocation of raw materials with different degrees of polymerization has a better synergistic effect, and the prepared material has good performance.
The degree of polymerization of the polyvinyl alcohol I may be less than 1500, and may be, for example, 1400, 1200, 1000, 800, 600, 500, or the like. The polymerization degree of polyvinyl alcohol II may be not less than 1500, and may be, for example, 1500, 2000, 2500, 3000 or 3500.
The ratio of polyvinyl alcohol I to polyvinyl alcohol II in polyvinyl alcohol is also subject to specific restrictions.
Calculated by taking the mass fraction of the polyvinyl alcohol as 100 percent, the mass fraction of the polyvinyl alcohol I in the polyvinyl alcohol is 0 to 50 percent and does not comprise 0 percent, and the mass fraction of the polyvinyl alcohol II is 50 to 100 percent and does not comprise 100 percent.
The above ratio is limited to ensure that the dosage of the polyvinyl alcohol I with low polymerization degree is less than or equal to that of the polyvinyl alcohol II with high polymerization degree, and if the dosage of the polyvinyl alcohol I with low polymerization degree is higher (more than 50 percent), the water-soluble temperature of the material for the straw is influenced, so that the material cannot meet the use requirement.
The polyvinyl alcohol I is typically, but not exclusively, 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45% or 50% by mass. Typical but not 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 melting processing temperature of the polyvinyl alcohol, reduce the strong acting force of hydroxyl groups among polyvinyl alcohol molecules, 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 the generation of double bonds can be relieved, the transparency or the glossiness of the prepared material can be improved, and the quality of the product can be 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 by weight, for example.
According to the invention, the addition of the processing aid can further improve the technical performance of the material for the straw, improve the heat resistance, the aging resistance and the like of the product, and the processing aid has good compatibility with polyvinyl alcohol, thereby being beneficial to maintaining the excellent physical properties of the product. The processing aid is 0.5 to 6 parts by weight, and typically, but not limited to, the processing aid may be 0.5 parts, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, 5.5 parts, or 6 parts by weight, for example.
All the raw materials in the formula are food-grade raw materials except polyvinyl alcohol, the produced material can be used for extruding disposable straws, 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 material dissolution or precipitation is not needed to be worried about in the using 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.
By reasonably adjusting and optimizing the using amount of each component in the material for the suction tube, the synergistic cooperation effect among the components is fully exerted, the processing performance, the physical performance or the 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 alcohols comprise polyvinyl alcohol I with a degree of polymerization < 1500 and a degree of alcoholysis > 85% and polyvinyl alcohol II with a degree of polymerization > 1500 and a degree of alcoholysis > 95%.
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. The alcoholysis Degree (DH) and the polymerization Degree (DP) are the main technical indexes of the polyvinyl alcohol, and the polyvinyl alcohols with different alcoholysis degrees and polymerization degrees have different performances and purposes. According to the invention, polyvinyl alcohols with different polymerization degrees are used as base materials, so that the polyvinyl alcohols can not be dissolved in normal-temperature water and hot water.
The alcoholysis degree is more than or equal to 85 percent, more preferably 88 to 99.5 percent, and can be, for example, 88 percent, 89 percent, 90 percent, 92 percent, 94 percent, 95 percent, 96 percent, 97 percent, 98 percent, 99 percent or 99.5 percent, which is typical but not limited.
In a preferred embodiment, the polyvinyl alcohol has an average particle size of 100 to 2000. mu.m, preferably 100 to 1000. mu.m, and 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 grain diameter in the range can enable the material to be plasticized more easily in the production process and is not easy to generate crystal points.
In a preferred embodiment, the polyvinyl alcohol has an ash content of 0.5% or less, preferably < 0.3%.
In a preferred embodiment, the purity of the polyvinyl alcohol is > 90%, preferably > 92%. The polyvinyl alcohol typically, but not by way of limitation, has a purity of 90%, 92%, 94%, 95%, 96%, 98%, 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, glycerol monoacetate, glycerol diacetate, glycerol triacetate, and triethylene glycol diisocaprylate;
preferably, the plasticizer comprises at least one of ethanol, ethylene glycol, propylene glycol, glycerol and pentaerythritol, and at least one of mannitol, sorbitol, monoacetin, diacetin, triacetin and triethylene glycol diisocaprylate.
The plasticizer of the present invention is not particularly limited as long as it does not limit the object of the present invention.
Preferably, the plasticizer is food grade raw material, including at least one of water-soluble low molecular weight polyol, high molecular weight polyol and polyol ester, and preferably is a compound plasticizer. It is understood that the term "small molecular weight polyol" refers to a polyol having 4 or less carbon atoms (C4 or less), and the term "large molecular weight polyol" refers to a polyol having > 4 carbon atoms.
Preferably, the plasticizer is compounded by using polyol with small molecular weight and polyol with large molecular weight or polyol ester, so that the raw materials with different molecular weights are matched, a better synergistic effect is achieved, and the effect of the plasticizer can be better exerted. Preferably, the plasticizer is selected from at least one of ethanol, ethylene glycol, propylene glycol, glycerol and pentaerythritol, and is compounded with at least one of mannitol, sorbitol, monoacetin, diacetin, triacetin and triethylene glycol diisocaprylate.
In a preferred embodiment, the processing aid comprises at least one of a lubricant, an antioxidant, and a thermal stabilizer;
preferably, the processing aid is a lubricant;
preferably, the lubricant is selected from polyethylene glycol with the polymerization degree of 200-2000, or a polyethylene glycol compound formed by combining several polyethylene glycols with different molecular weights and the number average molecular weight of 200-2000.
The processing aid of the present invention is not particularly limited as long as it does not limit the object of the present invention.
It is understood that the processing aid may include other types of processing aids commonly used in the art, such as antioxidants, in addition to lubricants, and the present invention is not particularly limited thereto.
Preferably, the processing aid is mainly a lubricant used in processing, the lubricant mainly adopts food-grade polyethylene glycol, the number average molecular weight is 200-2000, and the polyethylene glycol with the number average molecular weight or a polyethylene glycol compound is adopted, wherein 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, the same applies hereinafter), 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 reduces the precipitation in water-soluble products.
In a preferred embodiment, the material for the suction pipe has a melt index of 3-15 g/10min and a melting temperature of 120-250 ℃;
and/or the water-soluble temperature of the material for the suction tube is more than or equal to 80 ℃.
The melt index of the material for the suction pipe is 3 to 15g/10min (190 ℃, 2.16 kg). The water-soluble temperature is more than or equal to 80 ℃, which means that the material can be dissolved in water with the temperature of more than 80 ℃. The material has the decomposition temperature of more than 250 ℃, is colorless and transparent, does not yellow, and has excellent quality and performance.
Therefore, the material for a straw of the present invention is not soluble in hot water at normal temperature, and gradually dissolves in boiling water, that is, water at 80 ℃ or higher, so that there is no fear of dissolution or precipitation of the material during use.
In a third aspect, in at least one embodiment, there is provided a method of making a material for a straw comprising the steps of:
firstly, uniformly mixing the polyvinyl alcohol, the plasticizer and the processing aid according to the formula ratio, and then carrying out extrusion granulation to obtain the material for the straw.
The preparation method of the material for the straw is simple to operate and easy to implement, the material or the product for the straw can be obtained through one-time melt extrusion, granulation or direct molding after all the raw materials are fully and uniformly mixed, the controllability is strong, the production period is short, and industrialization is easy to realize.
In a preferred embodiment, the polyvinyl alcohol is added into a high-speed stirrer, then the plasticizer and the processing aid are added into the high-speed stirrer, stirred and discharged; then transferring the mixture into a double-screw extruder for extrusion granulation to obtain the material for the suction pipe;
preferably, the stirring time is 1-35 min, preferably 5-20 min;
preferably, the temperature of discharging is less than or equal to 30 ℃;
preferably, 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 tube is more than or equal to 80 ℃.
The preparation method of the material for the suction pipe, which is a preferable method of the invention, comprises the following steps: after weighing the components in parts by weight, firstly adding polyvinyl alcohol into a high-speed stirrer, starting low-speed stirring, then starting high-speed stirring, slowly adding a plasticizer and other auxiliaries, continuously stirring for 10-30 minutes after all the components are added, or feeding the mixture into a low-speed mixer after high-speed stirring for 1-2 minutes, continuously stirring for 10-30 minutes, cooling to below 30 ℃, discharging, and feeding the discharged material into a double-screw extruder for granulation to obtain the water-soluble material for the suction pipe.
The specific operating conditions of the twin-screw extruder are not particularly limited in the present invention, and can be controlled by those skilled in the art according to the actual conditions.
In a fourth aspect, in at least one embodiment, a straw is provided, made primarily from the foregoing straw material.
The straw made of the straw material can be directly discarded in nature after use, can be degraded in soil and can be degraded after being dissolved in water, so that the straw material does not affect resources, soil, environment and the like, and has obvious environmental protection benefit and application value.
It should be understood that the contents not described in detail in the above description of the preparation method or the prepared product are common parameters that can be easily conceived by those skilled in the art, and can be adjusted by those skilled in the art according to actual conditions, such as stirring speed, temperature, etc., so that detailed description thereof can be omitted.
For the understanding of those skilled in the art, the technical solution of the present invention will be further described in detail below with reference to specific examples and comparative examples.
Example 1
A material for a straw is mainly prepared from the following raw materials in parts by weight:
60 parts of polyvinyl alcohol II (polymerization degree of 3500, alcoholysis degree of 99%, average particle size of 100 μm), 40 parts of polyvinyl alcohol I (polymerization degree of 500, alcoholysis degree of 99%, average particle size of 100 μm), 8 parts of sorbitol, 14 parts of glycerol and 1 part of polyethylene glycol (polyethylene glycol 400) with molecular weight of 400.
The preparation method of the material for the straw comprises the following steps:
60kg of polyvinyl alcohol II (polymerization degree of 3500, alcoholysis degree of 99 percent and average particle size of 100 mu m) and 40kg of polyvinyl alcohol I (polymerization degree of 500, alcoholysis degree of 99 percent and average particle size of 100 mu m) are weighed, added into a high-speed stirrer and mixed for 2 minutes at high speed, then 8kg of sorbitol, 14kg of glycerol and 1kg of polyethylene glycol 400 are slowly added, after all the components are added, high-speed mixing is continued for 10 minutes, and the temperature is reduced to 30 ℃ for discharging. And adding the discharged powder into a double-screw extruder, setting the processing temperature at 120 ℃/140 ℃/150 ℃/160 ℃/170 ℃/180 ℃/190 ℃/190 ℃/190 ℃/180 ℃, and extruding and granulating to obtain the material for the straw.
Wherein the above-mentioned processing temperatures respectively represent the temperatures of one zone/two zones/three zones/four zones/five zones/six zones/seven zones/eight zones/nine zones/ten zones/head (the same applies hereinafter).
Example 2
A material for a straw is mainly prepared from the following raw materials in parts by weight:
70 parts of polyvinyl alcohol II (with the polymerization degree of 2000 and the alcoholysis degree of 99 percent and the average particle size of 500 mu m), 30 parts of polyvinyl alcohol I (with the polymerization degree of 800 and the alcoholysis degree of 95 percent and the average particle size of 500 mu m), 4 parts of sorbitol, 11 parts of glycerol, 7 parts of propylene glycol and 3 parts of polyethylene glycol (polyethylene glycol 1000) with the molecular weight of 1000.
The preparation method of the material for the straw comprises the following steps:
70kg of polyvinyl alcohol II (polymerization degree 2000, alcoholysis degree 99%, average particle size 500 μm) and 30kg of polyvinyl alcohol I (polymerization degree 800, alcoholysis degree 95%, average particle size 500 μm) are weighed, added into a high-speed stirrer and mixed for 2 minutes at high speed, then 11kg of glycerol, 7kg of propylene glycol, 4kg of sorbitol and 3kg of polyethylene glycol 1000 are slowly added, after all the components are added, high-speed mixing is continued for 15 minutes, and the temperature is reduced to 30 ℃ for discharging. And adding the discharged powder into a double-screw extruder, setting the processing temperature at 120 ℃/140 ℃/150 ℃/160 ℃/170 ℃/180 ℃/190 ℃/190 ℃/190 ℃/180 ℃, and extruding and granulating to obtain the material for the straw.
Example 3
A material for a straw is mainly prepared from the following raw materials in parts by weight:
60 parts of polyvinyl alcohol II (polymerization degree of 2500, alcoholysis degree of 99%, average particle size of 500 μm), 40 parts of polyvinyl alcohol I (polymerization degree of 800, alcoholysis degree of 95%, average particle size of 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 straw comprises the following steps:
60kg of polyvinyl alcohol II (with the polymerization degree of 2500, the alcoholysis degree of 99 percent and the average particle size of 500 mu m) and 40kg of polyvinyl alcohol I (with the polymerization degree of 800, the alcoholysis degree of 95 percent and the average particle size of 500 mu m) are weighed, added into a high-speed stirrer and mixed at a high speed for 2 minutes, then 10kg of glyceryl triacetate, 3kg of triethylene glycol diisocaprylate, 7kg of ethylene glycol and 5kg of polyethylene glycol 2000 are slowly added, after all the components are added, high-speed mixing is continued for 15 minutes, and the temperature is reduced to 30 ℃ for discharging. And adding the discharged powder into a double-screw extruder, setting the processing temperature at 120 ℃/130 ℃/140 ℃/145 ℃/150 ℃/140 ℃/140 ℃/140 ℃/135 ℃/130 ℃/130 ℃, and extruding and granulating to obtain the material for the straw.
Example 4
A material for a straw is mainly prepared from the following raw materials in parts by weight:
70 parts of polyvinyl alcohol II (polymerization degree of 3500, alcoholysis degree of 99%, average particle size of 1000 μm), 30 parts of polyvinyl alcohol I (polymerization degree of 500, alcoholysis degree of 99%, average particle size of 500 μm), 12 parts of mannitol, 10 parts of pentaerythritol and 2 parts of polyethylene glycol (polyethylene glycol 800) with molecular weight of 800.
The preparation method of the material for the straw comprises the following steps:
70kg of polyvinyl alcohol II (polymerization degree of 3000, alcoholysis degree of 99%, average particle size of 1000 μm) and 30kg of polyvinyl alcohol I (polymerization degree of 600, alcoholysis degree of 99%, average particle size of 500 μm) are weighed and added into a high-speed stirrer to be mixed for 2 minutes at high speed, then 12kg of mannitol, 10kg of pentaerythritol and 2kg of polyethylene glycol 800 are slowly added, after all the mannitol, the mixture is continuously mixed for 20 minutes at high speed, and the mixture is cooled to 30 ℃ to be discharged. And adding the discharged 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 straw.
Example 5
A material for a straw is mainly prepared from the following raw materials in parts by weight:
50 parts of polyvinyl alcohol II (with the polymerization degree of 1500 and the alcoholysis degree of 95 percent and the average particle size of 1000 mu m), 50 parts of polyvinyl alcohol I (with the polymerization degree of 400 and the alcoholysis degree of 95 percent and the average particle size of 2000 mu m), 6 parts of ethylene glycol, 5 parts of glycerol, 8 parts of glycerol monoacetate and 4 parts of polyethylene glycol (polyethylene glycol 1500) with the molecular weight of 1500.
The preparation method of the material for the straw comprises the following steps:
weighing 50kg of polyvinyl alcohol II (with the polymerization degree of 1500, the alcoholysis degree of 95 percent and the average particle size of 1000 mu m) and 50kg of polyvinyl alcohol I (with the polymerization degree of 400, the alcoholysis degree of 95 percent and the average particle size of 2000 mu m), adding into a high-speed mixer, mixing for 2 minutes at a high speed, then slowly adding 6kg of ethylene glycol, 5kg of glycerol, 8kg of glycerol monoacetate and 4kg of polyethylene glycol, continuously mixing for 20 minutes at a high speed after all the materials are added, cooling to 30 ℃ and discharging. And adding the discharged powder into a double-screw extruder, setting the processing temperature at 120 ℃/130 ℃/150 ℃/150 ℃/160 ℃/160 ℃/170 ℃/180 ℃/180 ℃/170 ℃/170 ℃, and extruding and granulating to obtain the material for the straw.
Example 6
A material for a straw was used in the same manner as in example 1 except that the weight parts of polyvinyl alcohol II in example 1 were changed from 60 parts to 80 parts, and the weight parts of polyvinyl alcohol I were changed from 40 parts to 20 parts.
The preparation method of the material for straw was the same as in example 1.
Example 7
A material for a straw was used in the same manner as in example 1 except that the polymerization degree of polyvinyl alcohol II in example 1 was changed to 3500 and 2000, respectively.
The preparation method of the material for straw was the same as in example 1.
Comparative example 1
A material for a straw is mainly prepared from the following raw materials in parts by weight:
100 parts of polyvinyl alcohol (the polymerization degree is 300, the alcoholysis degree is 88%, and the average particle size is 50 mu m), 20 parts of sorbitol, 10 parts of glycerol and 10 parts of polyethylene glycol (polyethylene glycol 2500) with the molecular weight of 2500.
The preparation method of the material for straw was the same as in example 1.
Comparative example 2
A material for a straw is mainly prepared from the following raw materials in parts by weight:
100 parts of polyvinyl alcohol (polymerization degree of 3500, alcoholysis degree of 88%, average particle size of 2500 μm), 8 parts of sorbitol, 10 parts of glycerol and 3 parts of polyethylene glycol (polyethylene glycol 400) with molecular weight of 400.
The preparation method of the material for straw was the same as in example 1.
Comparative example 3
A material for a straw was used in the same manner 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 straw was the same as in example 1.
Comparative example 4
A material for a straw was used in the same manner 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 straw was the same as in example 1.
Comparative example 5
A material for a straw was used in the same manner as in example 1 except that the polymerization degree of polyvinyl alcohol I in example 1 was changed to 500 instead of 2000.
The preparation method of the material for straw was the same as in example 1.
Comparative example 6
A material for a straw was used in the same manner as in example 1 except that 60 parts of polyvinyl alcohol II in example 1 was replaced with 20 parts of polyvinyl alcohol I and 80 parts of polyvinyl alcohol II was replaced with 40 parts of polyvinyl alcohol I.
The preparation method of the material for straw was the same as in example 1.
Comparative example 7
A material for a straw, which is a conventional polypropylene material.
Performance testing
The materials for suction pipes obtained in each of the examples and comparative examples were subjected to performance tests including appearance, melt index, water-dissolving temperature, etc., and the test results are shown in table 1.
Wherein, the melt index: test standard ASTM D1238-04, test conditions: 190 ℃ and 2.16 kg.
The detection method of the water-soluble temperature comprises the following steps: filling 800mL of water in a beaker, keeping the temperature of the beaker in a water bath or an oil bath to 20 ℃, and adjusting the magnetic stirring speed to 200r/min to ensure that the temperature of the water in the beaker is uniform; the sample was clamped with a 6cm by 6cm square clamp, the sample and sample clamp were completely immersed in water, the temperature was raised until the sample was completely dissolved, and the lowest temperature at which the sample was completely dissolved was recorded as the water-soluble temperature of the test material.
Table 1 results of performance testing
As can be seen from the above Table 1, the test results of the examples can basically meet the extrusion performance requirements of the straw, the color can be adjusted by adding color master, and the water-soluble temperatures of the comparative examples 1, 2, 4 and 6 are lower, so that the use requirements of the straw can not be met. The melt index of comparative examples 3 and 5 was low, and the flow of the extruded straw was too poor, and it was easily scorched and not easily molded.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The application of polyvinyl alcohol material in preparing a straw.
2. The material for the straw is characterized by being 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;
based on the mass fraction of the polyvinyl alcohol as 100%, the mass fraction of the polyvinyl alcohol I in the polyvinyl alcohol is 0-50% and does not include 0%, and the mass fraction of the polyvinyl alcohol II is 50-100% and does not include 100%.
3. The material for the straw as claimed in claim 2, which 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.
4. The material for the straw as claimed in claim 2, wherein the polyvinyl alcohol comprises polyvinyl alcohol I with a degree of polymerization less than 1500 and a degree of alcoholysis greater than or equal to 85% and polyvinyl alcohol II with a degree of polymerization greater than or equal to 1500 and a degree of alcoholysis greater than or equal to 95%;
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% and polyvinyl alcohol II with the polymerization degree of 2000-3500 and the alcoholysis degree of more than or equal to 95%.
5. The material for a straw according to claim 2, wherein the polyvinyl alcohol has an average particle diameter of 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 percent, preferably less than 0.3 percent;
and/or the purity of the polyvinyl alcohol is more than or equal to 90 percent, and preferably more than 92 percent.
6. The material for a straw according to any one of claims 2 to 5, wherein the plasticizer comprises 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, glycerol monoacetate, glycerol diacetate, glycerol triacetate, and triethylene glycol diisocaprylate;
preferably, the plasticizer comprises at least one of ethanol, ethylene glycol, propylene glycol, glycerol and pentaerythritol, and at least one of mannitol, sorbitol, monoacetin, diacetin, triacetin and triethylene glycol diisocaprylate.
7. The material for a straw according to any one of claims 2 to 5, wherein 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 the polymerization degree of 200-2000, or a polyethylene glycol compound formed by combining several polyethylene glycols with different molecular weights and the number average molecular weight of 200-2000;
preferably, 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 tube is more than or equal to 80 ℃.
8. The method for producing a material for a straw according to any one of claims 2 to 7, comprising the steps of:
firstly, uniformly mixing the polyvinyl alcohol, the plasticizer and the processing aid according to the formula ratio, and then carrying out extrusion granulation to obtain the material for the straw.
9. The method for preparing a material for a straw according to claim 8, wherein the polyvinyl alcohol is added into a high-speed stirrer, the plasticizer and the processing aid are added into the high-speed stirrer, and the mixture is stirred and discharged; then transferring the mixture into a double-screw extruder for extrusion granulation to obtain the material for the suction pipe;
preferably, the stirring time is 1-35 min, preferably 5-20 min;
preferably, the temperature of discharging is less than or equal to 30 ℃;
preferably, 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 tube is more than or equal to 80 ℃.
10. A straw characterized in that it is mainly made of the material for straw as claimed in any one of claims 2 to 7.
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| CN202210253397.XA CN114381080A (en) | 2022-03-15 | 2022-03-15 | Application of polyvinyl alcohol material, material for straw, preparation method of material and straw |
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