CN115304692B - Preparation method of natural environment-friendly rubber raw rubber - Google Patents
Preparation method of natural environment-friendly rubber raw rubber Download PDFInfo
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- CN115304692B CN115304692B CN202210769723.2A CN202210769723A CN115304692B CN 115304692 B CN115304692 B CN 115304692B CN 202210769723 A CN202210769723 A CN 202210769723A CN 115304692 B CN115304692 B CN 115304692B
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 116
- 238000002360 preparation method Methods 0.000 title claims abstract description 43
- 229920000126 latex Polymers 0.000 claims abstract description 167
- 239000004816 latex Substances 0.000 claims abstract description 165
- 239000000839 emulsion Substances 0.000 claims abstract description 74
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000002253 acid Substances 0.000 claims abstract description 43
- 239000008367 deionised water Substances 0.000 claims abstract description 38
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 38
- 238000003756 stirring Methods 0.000 claims abstract description 31
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000008394 flocculating agent Substances 0.000 claims abstract description 21
- 238000007865 diluting Methods 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 12
- 241001465754 Metazoa Species 0.000 claims abstract description 8
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 45
- KDYFGRWQOYBRFD-UHFFFAOYSA-N succinic acid Chemical compound OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 23
- 239000007787 solid Substances 0.000 claims description 22
- 238000001035 drying Methods 0.000 claims description 16
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 claims description 15
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims description 15
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 claims description 15
- 239000001384 succinic acid Substances 0.000 claims description 15
- 239000011975 tartaric acid Substances 0.000 claims description 15
- 235000002906 tartaric acid Nutrition 0.000 claims description 15
- 238000005406 washing Methods 0.000 claims description 15
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 claims description 3
- 239000000084 colloidal system Substances 0.000 claims 2
- 235000013311 vegetables Nutrition 0.000 claims 1
- 241000196324 Embryophyta Species 0.000 abstract description 37
- 238000005189 flocculation Methods 0.000 abstract description 19
- 239000003292 glue Substances 0.000 abstract description 16
- 230000016615 flocculation Effects 0.000 abstract description 13
- 230000007797 corrosion Effects 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 5
- 238000010090 natural rubber production Methods 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 38
- 239000000047 product Substances 0.000 description 26
- 230000000052 comparative effect Effects 0.000 description 15
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 12
- 239000002245 particle Substances 0.000 description 11
- 238000009792 diffusion process Methods 0.000 description 7
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 6
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- 235000019253 formic acid Nutrition 0.000 description 6
- 150000003384 small molecules Chemical class 0.000 description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 239000002351 wastewater Substances 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 244000043261 Hevea brasiliensis Species 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 239000013543 active substance Substances 0.000 description 2
- 150000001413 amino acids Chemical class 0.000 description 2
- 230000003712 anti-aging effect Effects 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- DQYBDCGIPTYXML-UHFFFAOYSA-N ethoxyethane;hydrate Chemical compound O.CCOCC DQYBDCGIPTYXML-UHFFFAOYSA-N 0.000 description 2
- 231100000206 health hazard Toxicity 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920003052 natural elastomer Polymers 0.000 description 2
- 229920001194 natural rubber Polymers 0.000 description 2
- 150000007524 organic acids Chemical class 0.000 description 2
- 239000004014 plasticizer Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- CBXRMKZFYQISIV-UHFFFAOYSA-N 1-n,1-n,1-n',1-n',2-n,2-n,2-n',2-n'-octamethylethene-1,1,2,2-tetramine Chemical group CN(C)C(N(C)C)=C(N(C)C)N(C)C CBXRMKZFYQISIV-UHFFFAOYSA-N 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000012736 aqueous medium Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- -1 hydrogen ions Chemical class 0.000 description 1
- 239000002609 medium Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 235000019645 odor Nutrition 0.000 description 1
- 238000000643 oven drying Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08C—TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
- C08C1/00—Treatment of rubber latex
- C08C1/14—Coagulation
- C08C1/15—Coagulation characterised by the coagulants used
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- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
Abstract
The invention belongs to the technical field of natural rubber production, and particularly relates to a preparation method of natural environment-friendly rubber raw rubber, which comprises the following steps of S01: diluting natural latex with deionized water to obtain latex emulsion; s02: dissolving 3% -8% of plant organic micromolecular weak acid with the mass of latex dry glue in deionized water to serve as a flocculating agent; s03: adding the latex emulsion into plant organic micromolecular weak acid, stirring for a period of time, and standing for a period of time at normal temperature to form a natural environment-friendly latex block. The invention provides a preparation method of natural environment-friendly rubber raw rubber, which uses plant organic micromolecular weak acid which exists in nature and can be extracted from plant raw materials or animals as a flocculating agent, and latex is reversely added into plant organic micromolecular weak acid with a certain concentration for flocculation, so that the harm to the physical health of operators and the corrosion to equipment can be effectively reduced, the flocculation process can be effectively accelerated, and the production efficiency of the natural environment-friendly rubber can be further improved.
Description
Technical Field
The invention belongs to the technical field of natural rubber production, and particularly relates to a preparation method of natural environment-friendly rubber raw rubber.
Background
Flocculation of latex is an important element in the production of natural rubber. The most common flocculation method in industry is to add strong acid flocculants such as formic acid and sulfuric acid into natural latex, and cure and solidify; strong acids such as formic acid, sulfuric acid are generally associated with strong pungent odors and are corrosive. In terms of humane environment, the use of strong acids such as formic acid, sulfuric acid and the like not only can cause great threat to the health of operators and have great influence on corrosion of equipment, but also the waste water generated in the production process is difficult to treat and can cause great harm to the environment. In terms of product production, when strong acid is added into natural latex, flocculation is uneven due to overhigh local acidity, the quality of natural rubber is affected, the reaction process needs sufficient curing time, and the problems of low flocculation efficiency, large flocculant consumption and the like exist.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a preparation method of natural environment-friendly rubber raw rubber, which uses plant organic micromolecular weak acid which exists in nature and can be extracted from plant raw materials or animals as a flocculating agent, has wide raw material source, low price, environmental protection, health and low corrosiveness, is applied to the preparation process of rubber, not only can effectively reduce the physical health hazard to operators and reduce the corrosion to equipment, but also the prepared rubber product is more environment-friendly, and meets the natural environment-friendly and harmless requirements of the rubber product; in addition, the waste water produced in the production process is safer, and the pollution and the harm to the environment are small. In terms of the preparation process, the latex is reversely added into the plant organic micromolecule weak acid with a certain concentration for flocculation, so that the process flow is simple and easy to operate, the flocculation can be completed at normal temperature without heating, the energy consumption is low, the plant organic micromolecule weak acid serving as the flocculant can fully react with the latex gradually added into the latex, the flocculation process is effectively accelerated, and the production efficiency of the natural environment-friendly rubber is further improved.
The technical effects to be achieved by the invention are realized by the following technical scheme:
the preparation method of the natural environment-friendly rubber raw rubber comprises the following steps of S01: diluting natural latex with deionized water to obtain latex emulsion;
s02: dissolving 3% -8% of plant organic micromolecular weak acid with the mass of latex dry glue in deionized water to serve as a flocculating agent;
s03: adding the latex emulsion into plant organic micromolecular weak acid, stirring for a period of time, and standing for a period of time at normal temperature to form a natural environment-friendly latex block.
As one preferable scheme, in the step S01, the solid content of the latex emulsion is 30-50% after the natural latex is diluted by deionized water.
In the step S02, the plant organic small molecule weak acid is a multi-element organic acid with a side chain containing hydroxyl, is colorless crystal, is a taste acid, and is soluble in water, ethanol and diethyl ether.
As a preferred embodiment, in step S02, the plant-based small organic molecule weak acid is tartaric acid, citric acid, succinic acid or itaconic acid which is present in nature and is extractable from plant materials or animals.
As one preferable scheme, in the step S02, the mass of the plant organic micromolecule weak acid is 3-5% of the mass of the latex dry glue and is dissolved in deionized water to be used as a flocculating agent.
As one preferable scheme, in the step S03, the latex emulsion is added into the plant organic small molecule weak acid, wherein the mass ratio of the latex emulsion to the plant organic small molecule weak acid is (1-2).
As one preferable scheme, in the step S03, after the latex emulsion is added into the plant organic micromolecule weak acid, the stirring speed is 200-500r/min.
As one preferable scheme, in the step S03, after the latex emulsion is added into the plant organic micromolecule weak acid, stirring time is 10-15 min.
As one preferable scheme, in the step S03, the latex emulsion is added into plant organic micromolecule weak acid, and after stirring is completed, the latex emulsion is kept stand for 1 to 2 hours at normal temperature.
As a preferred scheme, the method further comprises the following steps,
s04: taking out the latex block, washing with clear water, compressing, dehydrating, granulating and drying to obtain the natural environment-friendly rubber raw rubber.
In summary, the present invention has at least the following advantages:
1. according to the preparation method of the natural environment-friendly rubber raw rubber, as for the adopted raw materials, plant organic micromolecular weak acid which exists in the nature and can be extracted from plant raw materials or animals is used as a flocculating agent, the raw materials are wide in source, low in price, environment-friendly, healthy and low in corrosiveness, and when the natural environment-friendly rubber raw rubber is applied to the preparation process of rubber, the harm to the health of operators can be effectively reduced, the corrosion to equipment is reduced, and the prepared rubber product is more environment-friendly and meets the natural environment-friendly and harmless requirements of the rubber product; in addition, the waste water produced in the production process is safer, and the pollution and the harm to the environment are small.
2. According to the preparation method of the natural environment-friendly rubber raw rubber, latex is reversely added into plant organic micromolecular weak acid with a certain concentration for flocculation, the process flow is simple and easy to operate, the process can be completed at normal temperature without heating, the energy consumption is low, and the plant organic micromolecular weak acid serving as a flocculating agent can fully react with the latex gradually added into the latex, so that the flocculation process is effectively accelerated, and the production efficiency of the natural environment-friendly rubber is further improved.
Detailed Description
The invention provides a preparation method of natural environment-friendly rubber raw rubber, which comprises the following steps,
s01: diluting natural latex with deionized water to obtain latex emulsion;
s02: dissolving 3% -8% of plant organic micromolecular weak acid with the mass of latex dry glue in deionized water to serve as a flocculating agent;
s03: adding the latex emulsion into plant organic micromolecular weak acid, stirring for a period of time, and standing at normal temperature for a period of time to form a natural environment-friendly latex block;
s04: taking out the latex block, washing with clear water, compressing, dehydrating, granulating and drying to obtain the natural environment-friendly rubber raw rubber.
Further, in the step S01, the solid content of the latex emulsion is 30% -50% after the natural latex is diluted by deionized water. In step S02, the plant organic small molecule weak acid is a polybasic organic acid with a hydroxyl group in a side chain, is colorless crystal, is a taste acid, and is soluble in water, ethanol and diethyl ether, preferably tartaric acid, citric acid, succinic acid or itaconic acid which exist in nature and can be extracted from plant materials or animals. Further preferably, the plant organic micromolecule weak acid with the mass of 3-5% of the mass of the latex dry glue is taken and dissolved in deionized water to be used as a flocculating agent.
In the S03 step, adding the latex emulsion into the plant organic small molecule weak acid, wherein the mass ratio of the latex emulsion to the plant organic small molecule weak acid is (1-2); adding the latex emulsion into plant organic micromolecular weak acid, stirring at the speed of 200-500r/min for 10-15 min, and standing at normal temperature for 1-2 h after stirring.
The amino acid adsorbed on the surface of the stable latex particle is positioned at the interface of the polymer particle and the aqueous medium, the lipophilic group of the amino acid is attached to the surface of the particle inwards, and the hydrophilic group is contacted with the medium outwards, so that an adsorption layer of the single-molecule film is formed. The sliding surface is not on the solid surface due to the relative movement of the particles to the liquid, but on the surface of the adsorption layer in the liquid, and meanwhile, the hydrophilic particles form a diffusion layer in the process of outward diffusion, and the potential of the diffusion layer gradually drops at an exponential speed; the potential at the sliding surface is therefore called the diffusion potential or the bipotential-zeta potential, which is less than the total potential of the particle surface. The more charged the latex particles, the greater the absolute value of the zeta potential and the higher the stability of the latex; conversely, the less charged the latex particles, the smaller the absolute value of the zeta potential and the poorer the stability of the latex. The magnitude of the potential directly determines the stability of the latex system, and coagulation of the latex is to destroy the stability of the latex, i.e., to try to lower the zeta potential and precipitate the latex into the polymer. Taking formic acid coagulation as an example, when formic acid is added to the latex, the zeta potential changes as the concentration of hydrogen ions in the solution changes, and the positively charged ion concentration increases, generally compressing the thickness of the diffusion layer, and the total potential remains unchanged after the diffusion layer is compressed, with a consequent decrease in zeta potential. If the concentration of the formic acid is large enough, positive ions entering the adsorption layer completely neutralize negative charges in the adsorption layer, the diffusion layer disappears, so that the zeta potential becomes zero, which is an isoelectric state, latex particles are uncharged, and the latex particles are mutually collided to be coagulated by stirring or intense jet mixing, so that flocculation is realized.
For a better description of the objects, technical solutions and advantages of the present invention, the present invention will be further described with reference to the following specific examples. It will be appreciated by persons skilled in the art that the specific embodiments described herein are for purposes of illustration only and are not intended to be limiting.
In the examples, the experimental methods used are conventional methods unless otherwise specified, and the materials, reagents, etc. used, unless otherwise specified, are commercially available.
Example 1:
the embodiment provides a preparation method of natural environment-friendly rubber raw rubber, which comprises the following steps,
s01: diluting natural latex with deionized water to obtain latex emulsion with solid content of 30%;
s02: dissolving 3% of tartaric acid by mass of latex dry glue in deionized water as a flocculant, wherein the mass ratio of the latex emulsion to the tartaric acid solution is 1:1;
s03: adding the latex emulsion into tartaric acid solution, stirring at the speed of 350r/min for 15min, and standing at normal temperature for a period of time to form a natural environment-friendly latex block;
s04: taking out the latex block, washing with clear water, compressing, dehydrating, granulating and drying to obtain the natural environment-friendly rubber raw rubber product 1.
Example 2:
the embodiment provides a preparation method of natural environment-friendly rubber raw rubber, which comprises the following steps,
s01: diluting natural latex with deionized water to obtain latex emulsion with solid content of 30%;
s02: dissolving 5% of tartaric acid by mass of latex dry glue in deionized water as a flocculant, wherein the mass ratio of the latex emulsion to the tartaric acid solution is 1:1;
s03: adding the latex emulsion into tartaric acid solution, stirring at the speed of 350r/min for 15min, and standing at normal temperature for a period of time to form a natural environment-friendly latex block;
s04: taking out the latex block, washing with clear water, compressing, dehydrating, granulating and drying to obtain the natural environment-friendly rubber raw rubber product 2.
Example 3:
the embodiment provides a preparation method of natural environment-friendly rubber raw rubber, which comprises the following steps,
s01: diluting natural latex with deionized water to obtain latex emulsion with solid content of 50%;
s02: dissolving 8% of tartaric acid by mass of latex dry glue in deionized water as a flocculant, wherein the mass ratio of the latex emulsion to the tartaric acid solution is 1:1;
s03: adding the latex emulsion into tartaric acid solution, stirring at the speed of 350r/min for 15min, and standing at normal temperature for a period of time to form a natural environment-friendly latex block;
s04: taking out the latex block, washing with clear water, compressing, dehydrating, granulating and drying to obtain the natural environment-friendly rubber raw rubber product 3.
Example 4:
the embodiment provides a preparation method of natural environment-friendly rubber raw rubber, which comprises the following steps,
s01: diluting natural latex with deionized water to obtain latex emulsion with solid content of 30%;
s02: dissolving 3% of citric acid by mass of latex dry glue in deionized water as a flocculating agent, wherein the mass ratio of the latex emulsion to the citric acid solution is 1:1;
s03: adding the latex emulsion into citric acid solution, stirring at the speed of 350r/min for 15min, and standing at normal temperature for a period of time to form a natural environment-friendly latex block;
s04: taking out the latex block, washing with clear water, compressing, dehydrating, granulating and drying to obtain the natural environment-friendly rubber raw rubber product 4.
Example 5:
the embodiment provides a preparation method of natural environment-friendly rubber raw rubber, which comprises the following steps,
s01: diluting natural latex with deionized water to obtain latex emulsion with solid content of 30%;
s02: dissolving 5% of citric acid by mass of latex dry glue in deionized water as a flocculating agent, wherein the mass ratio of the latex emulsion to the citric acid solution is 1:1;
s03: adding the latex emulsion into citric acid solution, stirring at the speed of 350r/min for 15min, and standing at normal temperature for a period of time to form a natural environment-friendly latex block;
s04: taking out the latex block, washing with clear water, compressing, dehydrating, granulating and drying to obtain the natural environment-friendly rubber raw rubber product 5.
Example 6:
the embodiment provides a preparation method of natural environment-friendly rubber raw rubber, which comprises the following steps,
s01: diluting natural latex with deionized water to obtain latex emulsion with solid content of 50%;
s02: dissolving 8% of citric acid by mass of latex dry glue in deionized water as a flocculating agent, wherein the mass ratio of the latex emulsion to the citric acid solution is 1:1;
s03: adding the latex emulsion into citric acid solution, stirring at the speed of 350r/min for 15min, and standing at normal temperature for a period of time to form a natural environment-friendly latex block;
s04: taking out the latex block, washing with clear water, compressing, dehydrating, granulating and drying to obtain the natural environment-friendly rubber raw rubber product 6.
Example 7:
the embodiment provides a preparation method of natural environment-friendly rubber raw rubber, which comprises the following steps,
s01: diluting natural latex with deionized water to obtain latex emulsion with solid content of 30%;
s02: dissolving 3% of succinic acid by mass of latex dry glue in deionized water as a flocculating agent, wherein the mass ratio of the latex emulsion to the succinic acid solution is 1:1;
s03: adding the latex emulsion into succinic acid solution, stirring at the speed of 350r/min for 15min, and standing at normal temperature for a period of time to form a natural environment-friendly latex block;
s04: taking out the latex block, washing with clear water, compressing, dehydrating, granulating, and drying to obtain natural environment-friendly rubber raw rubber product 7.
Example 8:
the embodiment provides a preparation method of natural environment-friendly rubber raw rubber, which comprises the following steps,
s01: diluting natural latex with deionized water to obtain latex emulsion with solid content of 30%;
s02: dissolving 5% of succinic acid by mass of latex dry glue in deionized water as a flocculant, wherein the mass ratio of the latex emulsion to the succinic acid solution is 1:1;
s03: adding the latex emulsion into succinic acid solution, stirring at the speed of 350r/min for 15min, and standing at normal temperature for a period of time to form a natural environment-friendly latex block;
s04: taking out the latex block, washing with clear water, compressing, dehydrating, granulating and drying to obtain the natural environment-friendly rubber raw rubber product 8.
Example 9:
the embodiment provides a preparation method of natural environment-friendly rubber raw rubber, which comprises the following steps,
s01: diluting natural latex with deionized water to obtain latex emulsion with solid content of 50%;
s02: dissolving 8% of succinic acid by mass of latex dry glue in deionized water as a flocculating agent, wherein the mass ratio of the latex emulsion to the succinic acid solution is 1:1;
s03: adding the latex emulsion into succinic acid solution, stirring at the speed of 350r/min for 15min, and standing at normal temperature for a period of time to form a natural environment-friendly latex block;
s04: taking out the latex block, washing with clear water, compressing, dehydrating, granulating and drying to obtain the natural environment-friendly rubber raw rubber product 9.
Example 10:
the embodiment provides a preparation method of natural environment-friendly rubber raw rubber, which comprises the following steps,
s01: diluting natural latex with deionized water to obtain latex emulsion with solid content of 30%;
s02: dissolving 3% of itaconic acid by mass of latex dry glue in deionized water as a flocculating agent, wherein the mass ratio of the latex emulsion to the itaconic acid solution is 1:1;
s03: adding the latex emulsion into itaconic acid solution, stirring at the speed of 350r/min for 15min, and standing at normal temperature for a period of time to form a natural environment-friendly latex block;
s04: taking out the latex block, washing with clear water, compressing, dehydrating, granulating and drying to obtain the natural environment-friendly rubber raw rubber product 10.
Example 11:
the embodiment provides a preparation method of natural environment-friendly rubber raw rubber, which comprises the following steps,
s01: diluting natural latex with deionized water to obtain latex emulsion with solid content of 30%;
s02: dissolving itaconic acid accounting for 5% of the dry latex mass of the latex in deionized water to serve as a flocculating agent, wherein the mass ratio of the latex emulsion to the itaconic acid solution is 1:1;
s03: adding the latex emulsion into itaconic acid solution, stirring at the speed of 350r/min for 15min, and standing at normal temperature for a period of time to form a natural environment-friendly latex block;
s04: taking out the latex block, washing with clear water, compressing, dehydrating, granulating, and drying to obtain natural environment-friendly rubber raw rubber product 11.
Example 12:
the embodiment provides a preparation method of natural environment-friendly rubber raw rubber, which comprises the following steps,
s01: diluting natural latex with deionized water to obtain latex emulsion with solid content of 50%;
s02: dissolving 8% of itaconic acid by mass of latex dry glue in deionized water as a flocculating agent, wherein the mass ratio of the latex emulsion to the itaconic acid solution is 1:1;
s03: adding the latex emulsion into itaconic acid solution, stirring at the speed of 350r/min for 15min, and standing at normal temperature for a period of time to form a natural environment-friendly latex block;
s04: taking out the latex block, washing with clear water, compressing, dehydrating, granulating, and drying to obtain the natural environment-friendly rubber raw rubber product 12.
Comparative example 1:
this example provides a process for the preparation of a rubber green identical to that of example 1, with the main differences: in the step S03, tartaric acid solution is added into latex emulsion, stirred at the speed of 350r/min for 15min, and then kept stand for a period of time at normal temperature, so that a natural environment-friendly latex block is formed.
Comparative example 2:
this example provides a process for the preparation of a rubber green identical to that of example 2, the main difference being that: in the step S03, tartaric acid solution is added into latex emulsion, stirred at the speed of 350r/min for 15min, and then kept stand for a period of time at normal temperature, so that a natural environment-friendly latex block is formed.
Comparative example 3:
this example provides a process for the preparation of a rubber green identical to that of example 3, the main difference being that: in the step S03, tartaric acid solution is added into latex emulsion, stirred at the speed of 350r/min for 15min, and then kept stand for a period of time at normal temperature, so that a natural environment-friendly latex block is formed.
Comparative example 4:
this example provides a process for the preparation of a rubber green identical to that of example 4, the main difference being that: in the step S03, adding citric acid solution into the latex emulsion, stirring at the speed of 350r/min for 15min, and standing at normal temperature for a period of time to form a natural environment-friendly latex block.
Comparative example 5:
this example provides a process for the preparation of a rubber green identical to that of example 5, the main difference being that: in the step S03, adding citric acid solution into the latex emulsion, stirring at the speed of 350r/min for 15min, and standing at normal temperature for a period of time to form a natural environment-friendly latex block.
Comparative example 6:
this example provides a process for the preparation of a rubber green identical to that of example 6, the main difference being that: in the step S03, adding citric acid solution into the latex emulsion, stirring at the speed of 350r/min for 15min, and standing at normal temperature for a period of time to form a natural environment-friendly latex block.
Comparative example 7:
this example provides a process for the preparation of a rubber green identical to that of example 7, the main difference being that: in the step S03, adding the succinic acid solution into the latex emulsion, stirring at the speed of 350r/min for 15min, and standing at normal temperature for a period of time to form a natural environment-friendly latex block.
Comparative example 8:
this example provides a process for the preparation of a rubber green identical to that of example 8, the main difference being that: in the step S03, adding the succinic acid solution into the latex emulsion, stirring at the speed of 350r/min for 15min, and standing at normal temperature for a period of time to form a natural environment-friendly latex block.
Comparative example 9:
this example provides a process for the preparation of a rubber green identical to that of example 9, the main difference being that: in the step S03, adding the succinic acid solution into the latex emulsion, stirring at the speed of 350r/min for 15min, and standing at normal temperature for a period of time to form a natural environment-friendly latex block.
Comparative example 10:
this example provides a process for the preparation of a rubber green identical to that of example 10, the main difference being that: in the step S03, the itaconic acid solution is added into the latex emulsion, stirred for 15min at the speed of 350r/min, and then kept stand for a period of time at normal temperature, so that a natural environment-friendly latex block is formed.
Comparative example 11:
this example provides a process for the preparation of a rubber green identical to that of example 11, the main difference being that: in the step S03, the itaconic acid solution is added into the latex emulsion, stirred for 15min at the speed of 350r/min, and then kept stand for a period of time at normal temperature, so that a natural environment-friendly latex block is formed.
Comparative example 12:
this example provides a process for the preparation of a rubber green identical to that of example 12, the main difference being that: in the step S03, the itaconic acid solution is added into the latex emulsion, stirred for 15min at the speed of 350r/min, and then kept stand for a period of time at normal temperature, so that a natural environment-friendly latex block is formed.
Verification example 1:
standing the mixed solutions after stirring in examples 1-12 and comparative examples 1-12 at normal temperature, slowly precipitating latex particles from the emulsion to form natural environment-friendly latex blocks, and testing the solid content of the latex emulsion which is not precipitated in 1h, 1.5h, 2h, 3h, 5h and 8h respectively by using the following method;
0.2g of the samples were weighed out in a flat-bottomed dish, dried in a vacuum oven at a temperature of 125℃under a pressure of less than 20kPa for 1 hour, and the solid content of each sample was calculated using the following formula:
TSC(％)＝(w 2 -w 0 )/(w 1 -w 0 )×100；
wherein w is 0 : the mass of the beaker; w (w) 1 The total weight of the sample and beaker before drying; w (w) 2 : total weight of sample and beaker after oven drying. The test results are shown in tables 1 and 2:
TABLE 1 solids content of the latices of examples 1-12
TABLE 2 solids content of comparative examples 1-12 latices
As can be seen from a comparison of tables 1 and 2, the solid contents of the latex in examples 1 to 12 were substantially stable after standing at normal temperature for 2 hours, i.e., the flocculation process was completed; the latex solid contents in comparative examples 1 to 12 were not yet stable after standing for 8 hours at normal temperature, and the flocculation process was not realized; therefore, the preparation method of the natural environment-friendly rubber raw rubber in which the latex emulsion is reversely added into the flocculating agent can effectively shorten the flocculation completion time of the latex, accelerate the flocculation completion speed of the latex, and further effectively improve the production efficiency of the natural environment-friendly rubber.
Verification example 2:
the natural environment-friendly rubber raw rubber products prepared in examples 1-12 and the commercially available rubber raw rubber products are respectively mixed, and the mixing formula is as follows:
consists of 33.5 parts of product, 45 parts of carbon black, 10 parts of plasticizer, 7 parts of active agent, 2 parts of anti-aging agent, 1.5 parts of sulfur and 1 part of accelerator; wherein, the carbon black is preferably cabot N660, the plasticizer is preferably TDAE, the active agent is preferably 5 parts of zinc oxide and 2 parts of stearic acid, the anti-aging agent is preferably 6PPD, and the accelerator is preferably CZ.
The mixing process is as follows: setting the temperature of an open mill to 50 ℃, carrying out a thin-pass triangle bag for 6 times, stopping for 8 hours, taking a sheet to prepare an experimental sample, vulcanizing the rest of the experimental samples by a flat vulcanizing machine to obtain sheets, wherein the vulcanizing temperature is 150 ℃, the pressure is 10MPa, and the mechanical properties of each sample are shown in the following table;
as can be seen from the above table, the mechanical properties of the products prepared in examples 1 to 12 are equivalent to those of the commercial rubber raw rubber products, and when the flocculant is used in nature and can be extracted from plant raw materials or animals, the preparation method in the example is environment-friendly and healthy, the cost of the raw materials and the physical health hazard to operators can be effectively reduced, and the rubber products prepared by using the environment-friendly raw materials are also environment-friendly, so that the requirements of natural environment protection and no hazard of the rubber products are met.
According to the technical scheme of the embodiment, the invention provides the preparation method of the natural environment-friendly rubber raw rubber, and as for the adopted raw materials, plant organic micromolecular weak acid which exists in the nature and can be extracted from plant raw materials or animals is used as a flocculating agent, so that the raw materials are wide in source, low in price, environment-friendly, healthy and low in corrosiveness, and can be applied to the preparation process of the rubber, the harm to the physical health of operators and the corrosion to equipment can be effectively reduced, and the prepared rubber product is more environment-friendly and meets the natural environment-friendly and harmless requirements of the rubber product; in addition, the waste water produced in the production process is safer, and the pollution and the harm to the environment are small. In terms of the preparation process, the latex is reversely added into the plant organic micromolecule weak acid with a certain concentration for flocculation, so that the process flow is simple and easy to operate, the flocculation can be completed at normal temperature without heating, the energy consumption is low, the plant organic micromolecule weak acid serving as the flocculant can fully react with the latex gradually added into the latex, the flocculation process is effectively accelerated, and the production efficiency of the natural environment-friendly rubber is further improved.
While the invention has been described in conjunction with the specific embodiments above, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, all such alternatives, modifications, and variations are included within the spirit and scope of the following claims.
Claims (4)
1. A method for preparing natural environment-friendly rubber raw rubber is characterized by comprising the following steps,
s01: diluting natural latex with deionized water to obtain latex emulsion, wherein the solid content of the latex emulsion is 30% -50% after the natural latex is diluted with deionized water;
s02: dissolving plant organic micromolecular weak acid with the mass of 3% -8% of the dry colloid mass of the latex into deionized water to serve as a flocculating agent;
s03: adding the latex emulsion into a plant organic micromolecule weak acid solution, stirring for a period of time, and standing at normal temperature for a period of time to form a natural environment-friendly latex block;
in the step S02, the plant organic micromolecular weak acid is tartaric acid, citric acid, succinic acid or itaconic acid which exists in nature and can be extracted from plant raw materials or animals;
in the step S03, adding the latex emulsion into a plant organic micromolecule weak acid solution, and stirring at the speed of 200-500r/min for 10-15 min; the mass ratio of the latex emulsion to the plant organic micromolecular weak acid solution is (1-2): (1-2).
2. The preparation method according to claim 1, wherein in step S02, plant-based small organic molecule weak acid with a mass of 3% -5% of the dry colloid of the latex is dissolved in deionized water as a flocculant.
3. The method according to claim 1, wherein in step S03, the latex emulsion is added to the vegetable small organic molecule weak acid and allowed to stand at room temperature for 1 to 2 hours after the completion of stirring.
4. The method of manufacturing according to claim 1, further comprising the step of,
s04: taking out the latex block, washing with clear water, compressing, dehydrating, granulating and drying to obtain the natural environment-friendly rubber raw rubber.
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| JPH07188329A (en) * | 1993-12-27 | 1995-07-25 | Ube Cycon Ltd | Coagulation of polymer latex |
| JP2006232880A (en) * | 2005-02-22 | 2006-09-07 | Bridgestone Corp | Rubber composition |
| CN105153485A (en) * | 2015-09-09 | 2015-12-16 | 澄迈诚善农业有限公司 | Nano-modified skim block and preparation method thereof |
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| CN111867360A (en) * | 2018-03-30 | 2020-10-30 | 住友橡胶工业株式会社 | Layer for inhibiting soil moisture penetration, greening system and method for constructing greening system |
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|---|---|---|---|---|
| JPH07188329A (en) * | 1993-12-27 | 1995-07-25 | Ube Cycon Ltd | Coagulation of polymer latex |
| JP2006232880A (en) * | 2005-02-22 | 2006-09-07 | Bridgestone Corp | Rubber composition |
| CN105153485A (en) * | 2015-09-09 | 2015-12-16 | 澄迈诚善农业有限公司 | Nano-modified skim block and preparation method thereof |
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