CN114075341A - Process for degrading plastics by using calcium oxide - Google Patents
Process for degrading plastics by using calcium oxide Download PDFInfo
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- CN114075341A CN114075341A CN202010824111.XA CN202010824111A CN114075341A CN 114075341 A CN114075341 A CN 114075341A CN 202010824111 A CN202010824111 A CN 202010824111A CN 114075341 A CN114075341 A CN 114075341A
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- calcium oxide
- plastic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/20—Compounding polymers with additives, e.g. colouring
- C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
- C08J3/226—Compounding polymers with additives, e.g. colouring using masterbatch techniques using a polymer as a carrier
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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- 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
- C08K9/00—Use of pretreated ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/06—Polyethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2206—Oxides; Hydroxides of metals of calcium, strontium or barium
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- 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
- C08K2201/002—Physical properties
- C08K2201/005—Additives being defined by their particle size in general
Abstract
The invention provides a process for degrading plastics by using calcium oxide, which relates to the technical field of chemical production, and comprises the following steps: purchasing calcium oxide with purity of more than or equal to 95% and fineness of 1000-2000 meshes (less than or equal to 0.005 mm), modifying the calcium oxide by using a coupling agent in a high-speed stirring unit heated to 110 ℃, adding additives such as PE wax and the like, uniformly stirring, properly cooling, adding polyethylene, uniformly stirring, conveying the uniformly stirred raw materials to a double-screw granulating unit or an internal mixing unit, and plasticizing, extruding and granulating to prepare the calcium oxide degradable master batch. The calcium oxide degradation master batch is evenly stirred with quantitative raw materials according to the addition amount of 20-100 percent, and plastic products with degradation performance, such as disposable trays and plastic bags, are produced by plastic product machinery. The addition amount of 100 percent of the calcium oxide degradable plastic master batch is that the customized calcium oxide degradable plastic master batch is used as a plastic raw material according to the characteristics of a client product and can be directly produced into a product.
Description
Technical Field
The invention relates to the technical field of chemical production, in particular to a process for degrading plastics by using calcium oxide.
Background
The existing degradable plastics mainly are biodegradable plastics, which means that under the condition of nature such as soil and/or sandy soil, or under the specific condition such as composting condition or anaerobic digestion condition or aqueous culture solution, the main components of the degradable plastics such as organic matters of starch and the like are fermented under the action of microorganisms existing in natureDestroying the plastic structure, degrading and eventually degrading completely to carbon dioxide (CO)2) Or/and methane (CH)4) Water (H)2O) and mineralized inorganic salt of elements contained in the plastic and new biomass plastics, wherein the biodegradable plastic is mainly prepared by fermenting natural polymers (such as starch, cellulose and chitin) or agricultural and sideline products by microorganisms or synthesizing biodegradable polymers, such as thermoplastic starch plastics, aliphatic polyester, polylactic acid, starch/polyvinyl alcohol and the like. From 2006, the development of the biomass biodegradable material popularized by the national development and reform committee to date, the biodegradable plastic mainly takes starch as a main raw material and is accepted in the market, and mainly comprises biodegradable plastic, light/biodegradable plastic and polylactic acid (PLA). Polylactic acid (PLA) is prepared by fermenting and extracting substances such as starch, cellulose, chitin and the like, and the PLA material has a smooth surface and high transparency.
The existing plastic bag is mainly made of superfine starch which is an inflammable substance, and generates larger dust in the production and processing process, so that the dust has larger risk of explosion; the finished product made of starch substances can be said to be microbial culture medium, and is decomposed by microbial fermentation, harmful microbial contact pollution is possibly produced in the process of leaving a factory from finished products such as biodegradable plastic bags, and starch is mainly produced by grains such as corn, potatoes and the like, according to the statistics of China plastic association degradation plastic professional committee, the yield of about 30 enterprises engaged in biodegradation of plastics in 2005 reaches 6 million tons per year, and the annual increase is realized; under the vigorous popularization of the country in 2020, the requirement for starch substances is more huge, and conflicts must be generated for grains, and if the grains are in short supply under natural disasters, the conflicts are larger.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a process for degrading plastics by using calcium oxide, which solves the problems of higher cost, reduction of the conflict between environmental protection and grain, no dust explosion during mass production and avoidance of harmful microorganisms during use.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a process for degrading plastics by using calcium oxide comprises the following steps:
sp 1: the purity of procurement is more than or equal to 95 percent, and the fineness is 1000-plus 2000 meshes
Sp 2: modifying calcium oxide with coupling agent in a high-speed stirring machine set heated to 110 ℃;
sp 3: after modification treatment, adding additives such as PE wax and the like, stirring uniformly (cooling properly), adding LLDPE and stirring uniformly;
sp 4: putting the uniformly stirred raw materials into a granulator set, and heating, plasticizing, extruding and granulating the raw materials by a granulator to prepare small granular calcium oxide degradable master batches;
sp 5: uniformly stirring the calcium oxide degradation master batch and quantitative raw materials according to the addition amount of 20-100%, and mechanically producing plastic products with degradation performance, such as disposable trays and plastic film bags, by plastic products; the plastic articles are sealed prior to shipping and use.
Preferably, the calcining temperature of the limestone is 900-1000 degrees, and the calcium oxide extracted from the limestone is crushed by a jaw crusher after being screened and is ground to the particle size of 0.005-10 mm; powder with fine calcium oxide particle size not greater than 0.01mm and calcium oxide content not less than 95% is selected and extracted as raw material
Preferably, the crushed calcium oxide is added with a coupling agent, the raw materials are heated and stirred by a vertical stirrer, and the stirrer is in a flat-bottom barrel-shaped radiation circulation spiral impeller mechanical stirring type.
Preferably, the granulator is a double-screw granulator, the model of the double-screw granulator is more than 50, and the length-diameter ratio of the equipment is more than or equal to 40: 1,44: 1 and preferably 1.5KW-2KW, and the heating ring of the screw granulator. It can also be produced by banbury mixer.
Preferably, the added raw materials are plastic raw materials and calcium oxide degradable plastic master batches, the plastic raw materials are added by 80-0%, the calcium oxide degradable plastic master batches are added by 20-100%, and the thickness of the formed film is more than 0.0075 mm. The addition amount of 100 percent of the calcium oxide degradable plastic master batch is that the customized calcium oxide degradable plastic master batch is used as a plastic raw material according to the characteristics of a client product and can be directly produced into a product.
Preferably, the formed film is processed by a bag making machine, and the edge sealing quality of the bag is not affected. But hermetically packaging the plastic product (e.g., bag).
(III) advantageous effects
The invention provides a process for degrading plastics by using calcium oxide. The method has the following beneficial effects:
1. the calcium oxide is adopted to replace starch, the production raw material of the calcium oxide is limestone, the raw material is easy to mine, the resources are rich, and the product is high;
2. compared with starch, the product prepared by adopting the industrial calcium oxide has low price which is at least 50% lower than that of the starch and is cheaper than plastic raw materials, and can be used as a main raw material for degrading plastic, so that the manufacturing cost is greatly reduced, and the condition that the raw material demand is not enough is not needed to be worried;
3. the calcium oxide is used as the main raw material of the degradable plastic, so that the dependence on the long-term use of starch as the main raw material of the degradable plastic is reduced, the use of starch is reduced, the consumption of grain is reduced, and the conflict between environmental protection and grain consumption is reduced;
4. the calcium oxide is adopted to replace starch, so that dust explosion generated in the mass production process is avoided, the calcium oxide powder is not inflammable and explosive dust, is colorless and tasteless, is added into the plastic bag, does not generate peculiar smell, has a lot of bread smell compared with the plastic bag made of starch, does not nourish bacteria in disposable articles, and has a certain sterilization effect.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
as shown in fig. 1, an embodiment of the present invention provides a process for degrading plastics by using calcium oxide, including the following steps: the product release standard of the treatment industry is quantified according to the daily wastewater quantity of 2500t in a factory, and according to the actual situation, the equivalent scale reduction or optimization can be carried out,
sp 1: can be ignored, the direct purchase purity is not less than 95%, the fineness is 1000-
Sp 2: modifying calcium oxide with coupling agent in a high-speed stirring machine set heated to 110 ℃;
sp 3: after modification, adding additives such as PE wax and the like, stirring uniformly (cooling properly), adding polyethylene, and stirring uniformly;
sp 4: putting the uniformly stirred raw materials into a granulator set, and heating, plasticizing, extruding and granulating the raw materials by a granulator to prepare small granular calcium oxide degradable master batches;
sp 5: uniformly stirring the calcium oxide degradation master batch and quantitative raw materials according to the addition amount of 20-100%, and mechanically producing plastic products with degradation performance, such as disposable trays and plastic film bags, by plastic products; the plastic articles are sealed prior to shipping and use.
Example two:
as shown in figure 1, the embodiment of the invention provides a process for degrading plastics by using calcium oxide, the calcining temperature of limestone is 900-1000 degrees, calcium oxide extracted from the limestone is crushed by a jaw crusher and is ground to the particle size of 0.005-10 mm; the powder with the fine calcium oxide particles of less than or equal to 0.01mm and the calcium oxide content of more than or equal to 95 percent is selected and extracted as the raw material. Adding a coupling agent into the calcium oxide in a high-speed stirrer for modification treatment; the stirrer is a flat-bottom barrel-shaped radiation circulation spiral impeller mechanical stirring type and has the functions of frequency conversion speed control, temperature reduction and cooling.
Example three:
as shown in FIG. 1, the embodiment of the invention provides a process for degrading plastics by using calcium oxide, wherein a double-screw granulator with a model number of more than 50 is adopted in the granulator, and the length-diameter ratio of the granulator is not less than 40: 1,44: 1, preferably 1.5-2 KW, and a heating ring of the screw granulator is 1.5KW-2 KW; it can also be produced by banbury mixer. In the plastic production, taking a plastic film bag as an example, 20-100% of calcium oxide degradable plastic master batch is added and uniformly stirred with quantitative raw materials, and the plastic film bag with the degradation performance is produced by a plastic product machine, wherein the thickness can be more than 0.0075 mm. The addition amount of 100 percent of the calcium oxide degradable plastic master batch is that the customized calcium oxide degradable plastic master batch is used as a plastic raw material according to the characteristics of a client product and can be directly produced into a product.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a reference structure" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The process of degrading plastic with calcium oxide includes the following steps:
sp 1: the purity of procurement is more than or equal to 95 percent, and the fineness is 1000-plus 2000 meshes
Sp 2: modifying calcium oxide with coupling agent in a high-speed stirring machine set heated to 110 ℃;
sp 3: after modification, adding additives such as PE wax and the like, stirring uniformly (cooling properly), adding polyethylene, and stirring uniformly;
sp 4: putting the uniformly stirred raw materials into a granulator set, and heating, plasticizing, extruding and granulating the raw materials by a granulator to prepare small granular calcium oxide degradable master batches;
sp 5: uniformly stirring the calcium oxide degradation master batch and quantitative raw materials according to the addition amount of 20-100%, and mechanically producing plastic products with degradation performance, such as disposable trays and plastic film bags, by plastic products; the plastic articles are sealed prior to shipping and use.
2. The process for degrading plastics by using calcium oxide as claimed in claim 1, wherein the process comprises the following steps: the calcining temperature of the limestone is 900-1000 degrees, the calcium oxide obtained by screening and refining the limestone is crushed by a jaw crusher and ground to the particle size of 0.005-10 mm; the powder with the fine calcium oxide particles of less than or equal to 0.01mm and the calcium oxide content of more than or equal to 95 percent is selected and extracted as the raw material.
3. The process for degrading plastics by using calcium oxide as claimed in claim 1, wherein the process comprises the following steps: adding a coupling agent into the fine calcium oxide in a high-speed stirrer, and carrying out modification treatment through a vertical stirrer; the stirrer is a flat-bottom barrel-shaped radiation circulation spiral impeller mechanical stirring type and has the functions of frequency conversion speed control, temperature reduction and cooling.
4. The process for degrading plastics by using calcium oxide as claimed in claim 1, wherein the process comprises the following steps: the granulator adopts the twin-screw granulator, and the twin-screw granulator model is more than 50, and the draw ratio of equipment is more than or equal to 40: 1,44: 1, preferably 1.5-2 KW, and a heating ring of the screw granulator is 1.5KW-2 KW; it can also be produced by banbury mixer.
5. The process for degrading plastics by using calcium oxide as claimed in claim 1, wherein the process comprises the following steps: the calcium oxide degradable plastic master batch is added into the raw materials, and the thickness of the produced film is more than 0.0075mm, wherein the calcium oxide degradable plastic master batch is added by 20-100 percent; the addition amount of 100 percent of the calcium oxide degradable plastic master batch is that the customized calcium oxide degradable plastic master batch is used as a plastic raw material according to the characteristics of a client product and can be directly produced into a product.
6. The process for degrading plastics by using calcium oxide as claimed in claim 1, wherein the process comprises the following steps: the formed film is processed by a bag making machine, so that the edge sealing quality of the bag is not influenced; but hermetically packaging the plastic product (e.g., a bag).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010824111.XA CN114075341A (en) | 2020-08-17 | 2020-08-17 | Process for degrading plastics by using calcium oxide |
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| CN202010824111.XA CN114075341A (en) | 2020-08-17 | 2020-08-17 | Process for degrading plastics by using calcium oxide |
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| CN114075341A true CN114075341A (en) | 2022-02-22 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104804385A (en) * | 2014-01-23 | 2015-07-29 | 连甲有限公司 | Production method and applications of biodegradable plastic masterbatch |
| US20150337136A1 (en) * | 2012-11-15 | 2015-11-26 | Kalkfabrik Netstal Ag | Surface-modified calcium oxide |
| CN106883568A (en) * | 2015-12-15 | 2017-06-23 | 深圳市联创科技集团有限公司 | Absorbent masterbatch of fully biodegradable plastics and preparation method thereof |
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- 2020-08-17 CN CN202010824111.XA patent/CN114075341A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150337136A1 (en) * | 2012-11-15 | 2015-11-26 | Kalkfabrik Netstal Ag | Surface-modified calcium oxide |
| CN104804385A (en) * | 2014-01-23 | 2015-07-29 | 连甲有限公司 | Production method and applications of biodegradable plastic masterbatch |
| CN106883568A (en) * | 2015-12-15 | 2017-06-23 | 深圳市联创科技集团有限公司 | Absorbent masterbatch of fully biodegradable plastics and preparation method thereof |
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