CN115010988A - Plant milk retention composition for natural rubber latex and preparation method and application thereof - Google Patents
Plant milk retention composition for natural rubber latex and preparation method and application thereof Download PDFInfo
- Publication number
- CN115010988A CN115010988A CN202210685198.6A CN202210685198A CN115010988A CN 115010988 A CN115010988 A CN 115010988A CN 202210685198 A CN202210685198 A CN 202210685198A CN 115010988 A CN115010988 A CN 115010988A
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- Prior art keywords
- natural rubber
- rubber latex
- percent
- composition
- wild
- Prior art date
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Classifications
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
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- C08K5/005—Stabilisers against oxidation, heat, light, ozone
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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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
- C08K5/00—Use of organic ingredients
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08K5/134—Phenols containing ester groups
- C08K5/1345—Carboxylic esters of phenolcarboxylic acids
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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
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- C08K5/151—Heterocyclic compounds having oxygen in the ring having one oxygen atom in the ring
- C08K5/1535—Five-membered rings
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Landscapes
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- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention provides a plant emulsion-protecting composition for natural rubber emulsion and a preparation method and application thereof, and solves the technical problems that ammonia water of the natural rubber emulsion-protecting agent in the prior art is toxic and harmful, pollutes the environment, is inconvenient to transport, increases the production cost and reduces the product quality. The plant milk retention composition for the natural rubber latex comprises the following components: wild yam, lemon, wild grape, wild loquat, green jujube, Chinese hawthorn and functional materials, wherein the functional materials are as follows: a combination of sodium nitrite, calcium formate, ascorbic acid, calcium propionate, propyl hydroxybenzoate, and sodium bicarbonate powder; also provides a preparation method and application thereof. Can be widely applied to the technical field of rubber production.
Description
Technical Field
The invention relates to the technical field of rubber production, in particular to a plant latex-protecting composition for natural rubber latex and a preparation method and application thereof.
Background
The early preservation of the fresh latex before flowing out of the rubber tree to the factory is an important technical link of rubber tapping production, the natural rubber latex is a natural high molecular compound taking cis-1, 4-polyisoprene as a main component, 91-94% of the natural rubber latex is rubber hydrocarbon, and the rest is nutrient substances such as protein, fatty acid, ash, carbohydrate, lipid and the like and non-rubber substances. The field latex breaks within hours after tapping due to the action of the activity of bacteria and enzymes. If milk preservation and anticoagulation are not carried out in time, the rubber milk can quickly go bad, become rotten and go bad, separate water and rubber, naturally solidify and the like, and finally the rubber milk goes bad and loses the mechanical and physical properties of rubber.
In the prior art, a common measure for preventing the natural rubber latex from putrefaction, deterioration and demulsification is to add ammonia into the rubber latex, and the adding amount of the ammonia is determined according to the time for which the latex needs to be kept in a liquid state. However, the use of ammonia as an additive has many problems, such as: the ammonia water is toxic and harmful, pollutes the environment, has volatility, irritation and corrosiveness, is inconvenient to transport, increases the production cost, can influence the demulsification of latex and the drying of rubber, and reduces the quality of final products.
In addition, formic acid is generally used for demulsification after ammonia addition, and the demulsification with formic acid is easy to cause rubber oxidation for a long time and also damage the rubber quality.
Meanwhile, in the production process of the rubber, wastewater containing ammonia and formic acid is discharged, and the sewage treatment pressure is increased. Therefore, in the existing rubber production process, an environment-friendly rubber latex emulsion is urgently needed.
Disclosure of Invention
Aiming at the defects and shortcomings in the related technology, the invention provides the plant milk retention composition for the natural rubber latex, which has no irritation, no pollution to the ecological environment, safety and no toxicity, obviously improves the storage life of the natural rubber latex, has simple manufacturing process and convenient use, and accords with the green environmental protection idea pursued at present, and the preparation method and the application thereof.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the plant milk retention composition for the natural rubber latex comprises the following components: wild yam, lemon, wild grape, wild loquat, green jujube, Chinese hawthorn and functional materials, wherein the functional materials are as follows: a combination of sodium nitrite, calcium formate, ascorbic acid, calcium propionate, propyl hydroxybenzoate and sodium bicarbonate.
Preferably, the weight percentage of each component in the plant milk retention composition for the natural rubber latex is 5-8% of wild sweet potato, 20-30% of lemon, 18-22% of wild grape, 30-38% of wild loquat, 3-5% of green date, 10-20% of Chinese hawthorn and 20-30% of functional material, wherein the total weight of the plant milk retention composition for the natural rubber latex is 100%;
the functional material comprises the following components in percentage by weight: 2 to 4 percent of mixture of sodium nitrite and calcium formate, 8 to 12 percent of ascorbic acid, 2 to 3 percent of calcium propionate, 6 to 8 percent of propyl p-hydroxybenzoate and 2 to 2.5 percent of sodium bicarbonate.
Preferably, in the mixture of sodium nitrite and calcium formate as the functional material component, the weight ratio of sodium nitrite to calcium formate is 2: 10.
The preparation method of the plant milk retention composition for the natural rubber latex comprises the following steps:
(1) respectively weighing wild yam, lemon, wild grape, wild loquat, green date and Chinese hawthorn according to a set weight ratio, cleaning, airing, dehydrating, crushing, mixing and extruding to form a mixture before extraction;
(2) placing the pre-extraction mixture prepared in the step (1) and an extracting agent into a rapid solvent extraction apparatus, and performing gradient extraction in sequence to obtain an extraction solution; standing the extractive solution for precipitation, collecting supernatant, filtering, mixing all extractive solutions, concentrating, drying, and pulverizing to obtain powder A;
(3) and (3) adding the weighed mixture of the functional materials of sodium nitrite, calcium formate, ascorbic acid, calcium propionate, propyl hydroxybenzoate and sodium bicarbonate powder into the powder A prepared in the step (2), pouring the mixture into a high-speed crushing stirrer, and uniformly mixing and crushing to obtain the plant latex-protecting composition for the natural rubber latex.
Preferably, in the step (2), the extracting agent is ethyl acetate-water mixed solution, wherein the mass percent of the ethyl acetate is 10% -30%; the weight ratio of the mixture to the extractant before extraction is 1: 5-10.
Preferably, the condition parameters of the gradient extraction using the rapid solvent extractor in the step (2) are as follows: the flow rate of a pump is 80mL/min, the used gas is nitrogen, the pressure is 1000Psi, the temperature is 65-80 ℃, the extraction is carried out for 3-5 times, and the extraction time is 2.5-3.5 h each time.
Preferably, the supernatant liquid filtration treatment method in the step (2) comprises the following steps: filtering with a multilayer filter sieve device, wherein the pore diameters of the multilayer filter sieve are respectively 38 μm, 45 μm and 48 μm from the upper layer to the lower layer.
Preferably, in the step (2), the drying temperature is 40-50 ℃, the drying time is 2-3 h, and the moisture content of the dried powder A is less than or equal to 0.2%.
The application of the plant milk retention composition for the natural rubber latex is used for preparing environment-friendly particle tobacco flake glue.
The plant milk retention composition for the natural rubber latex, the preparation method and the application thereof provided by the invention have the following beneficial effects:
(1) the plant latex-preserving composition for the natural rubber latex can keep fresh of fresh latex at normal temperature for more than 60 days through detection, has no deterioration, no mildew or demulsification effect, obviously improves the quality of the natural rubber latex, has no side effect, and also improves the physical and mechanical properties of the natural rubber; in addition, the natural rubber latex is non-toxic, non-irritant and non-harmful to human bodies, can completely replace emulsion-protecting ammonia water in the prior art to keep the natural rubber latex fresh, is environment-friendly, and accords with the green environmental protection concept pursued at present.
(2) The plant latex-protecting composition for the natural rubber latex is alkalescent and has no damage to the natural rubber latex (high polymer material), so that the physical and mechanical properties of the finished environment-friendly granular tobacco flake glue are higher than those of the tobacco flake glue prepared by using ammonia and formic acid.
(3) According to the application of the plant milk retention composition for the natural rubber latex, the dry glue content of the prepared environment-friendly particle tobacco flake glue is obviously higher than that of a rubber dairy product which is preserved by ammonia water and solidified by formic acid through detection.
Detailed Description
The present invention will be further described with reference to specific examples to assist understanding of the invention. The method used in the invention is a conventional method if no special provisions are made; the raw materials and the apparatus used are, unless otherwise specified, conventional commercially available products.
Example 1
A method for preparing a plant milk retention composition for natural rubber latex, comprising the steps of:
(1) weighing 5Kg of wild sweet potato, 20Kg of lemon, 18Kg of wild grape, 30Kg of wild loquat, 3Kg of green jujube and 10Kg of Chinese hawthorn respectively according to a set weight ratio, cleaning, airing, dehydrating, crushing, mixing and extruding to form a mixture before extraction; weighing the functional materials, wherein the components are respectively as follows: 2Kg of mixture of sodium nitrite and calcium formate, 9Kg of ascorbic acid, 2Kg of calcium propionate, 7Kg of propyl p-hydroxybenzoate and 2Kg of sodium bicarbonate, wherein the weight ratio of sodium nitrite to calcium formate in the mixture of sodium nitrite and calcium formate is 2: 10.
(2) Putting the mixture before extraction prepared in the step (1) and 430Kg of extractant into a rapid solvent extractor, wherein the extractant is an ethyl acetate-water mixed solution, the mass percent of the ethyl acetate is 10%, performing gradient extraction in sequence, and the condition parameters of the gradient extraction performed by using the rapid solvent extractor are as follows: pumping at a flow rate of 80mL/min, using nitrogen as a gas, extracting for 3 times at a temperature of 65 ℃ under a pressure of 1000Psi for 2.5 hours each time to obtain an extraction solution;
standing the extract for 20h, and filtering supernatant liquor, wherein the supernatant liquor is obtained by the filtration treatment method: filtering with multilayer filter sieve device, sequentially sieving with standard sieves having apertures of 38 μm, 45 μm and 48 μm from upper layer to lower layer, mixing all the filtered extractive solutions, concentrating, drying at 40 deg.C for 2 hr, and pulverizing to obtain powder A; the moisture content of the powder A after drying is less than or equal to 0.2 percent.
(3) And (3) adding the weighed mixture of the functional materials of sodium nitrite, calcium formate, ascorbic acid, calcium propionate, propyl hydroxybenzoate and sodium bicarbonate powder into the powder A prepared in the step (2), pouring the mixture into a high-speed crushing stirrer, and uniformly mixing and crushing to obtain the plant latex-protecting composition for the natural rubber latex.
The detection shows that the finished product of the plant milk retention composition for the natural rubber latex is white and semitransparent crystal, is easy to dissolve in water, and has 0.23 percent of volatile matter, 0.04 percent of ash content, 9.4 percent of PH, 99.73 percent of ethyl acetate dissolved matter and 0.06 percent of screen residue.
Example 2
A method for preparing a plant milk retention composition for natural rubber latex, comprising the steps of:
(1) weighing 6Kg of wild sweet potato, 22Kg of lemon, 20Kg of wild grape, 33Kg of wild loquat, 3Kg of green jujube and 12Kg of Chinese hawthorn respectively according to the set weight percentage ratio, cleaning, airing, dehydrating, crushing, mixing and extruding to form a mixture before extraction; weighing the functional materials, wherein the components are respectively as follows: 3Kg of mixture of sodium nitrite and calcium formate, 9Kg of ascorbic acid, 2Kg of calcium propionate, 8Kg of propyl p-hydroxybenzoate and 2Kg of sodium bicarbonate powder, wherein the weight ratio of sodium nitrite to calcium formate in the mixture of sodium nitrite and calcium formate is 2: 10.
(2) Putting the pre-extraction mixture prepared in the step (1) and 576Kg of extracting agent into a quick solvent extractor, wherein the extracting agent is a mixed solution of ethyl acetate and water, the mass percent of the ethyl acetate is 20%, sequentially carrying out gradient extraction, and the condition parameters of the gradient extraction carried out by using the quick solvent extractor are as follows: pumping at a flow rate of 80mL/min, using nitrogen as a gas, extracting for 4 times at a temperature of 75 ℃ under a pressure of 1000Psi for 3 hours each time to obtain an extraction solution;
standing the extract for 20h, and filtering supernatant liquor, wherein the supernatant liquor is obtained by the filtration treatment method: filtering with multilayer filter sieve device, sequentially sieving with standard sieves having apertures of 38 μm, 45 μm and 48 μm from upper layer to lower layer, mixing all the filtered extractive solutions, concentrating, drying at 45 deg.C for 2.5 hr, and pulverizing to obtain powder A; the moisture content of the powder A after drying is less than or equal to 0.2 percent.
(3) And (3) adding the weighed mixture of the functional materials of sodium nitrite, calcium formate, ascorbic acid, calcium propionate, propyl hydroxybenzoate and sodium bicarbonate powder into the powder A prepared in the step (2), pouring the mixture into a high-speed crushing stirrer, and uniformly mixing and crushing to obtain the plant latex-protecting composition for the natural rubber latex.
The detection shows that the finished product of the plant milk retention composition for the natural rubber latex is white semitransparent crystal, is easy to dissolve in water, and has 0.13 percent of volatile matter, 0.07 percent of ash content, 9.5 percent of PH, 99.75 percent of ethyl acetate dissolved matter and 0.05 percent of screen residue.
Example 3
A method for preparing a plant milk retention composition for natural rubber latex, comprising the steps of:
(1) weighing 5Kg of wild yam, 23Kg of lemon, 22Kg of wild grape, 32Kg of wild loquat, 4Kg of green jujube and 13Kg of Chinese hawthorn respectively according to a set weight ratio, cleaning, airing, dehydrating, crushing, mixing and extruding to form a mixture before extraction; weighing the functional materials, wherein the components are respectively as follows: 2Kg of mixture of sodium nitrite and calcium formate, 11Kg of ascorbic acid, 3Kg of calcium propionate, 7Kg of propyl p-hydroxybenzoate and 2Kg of sodium bicarbonate powder, wherein the weight ratio of sodium nitrite to calcium formate in the mixture of sodium nitrite and calcium formate is 2: 10.
(2) Putting the pre-extraction mixture prepared in the step (1) and 495Kg of extractant into a quick solvent extractor, wherein the extractant is an ethyl acetate-water mixed solution, the mass percent of the ethyl acetate is 30%, performing gradient extraction in sequence, and the condition parameters of the gradient extraction performed by using the quick solvent extractor are as follows: pumping at 80mL/min with nitrogen as the gas, pressure of 1000Psi, temperature of 80 deg.C, extracting for 5 times, each time for 3.5h to obtain extractive solution;
standing the extract for 25h, and filtering supernatant liquor, wherein the filtering treatment method of the supernatant liquor comprises the following steps: filtering with multilayer filter sieve device, sequentially sieving with standard sieves having apertures of 38 μm, 45 μm and 48 μm from upper layer to lower layer, mixing all the filtered extractive solutions, concentrating, drying at 50 deg.C for 3 hr, and pulverizing to obtain powder A; the moisture content of the powder A after drying is less than or equal to 0.2 percent.
(3) And (3) adding the weighed mixture of the functional materials of sodium nitrite, calcium formate, ascorbic acid, calcium propionate, propyl hydroxybenzoate and sodium bicarbonate powder into the powder A prepared in the step (2), pouring the mixture into a high-speed crushing stirrer, and uniformly mixing and crushing to obtain the plant latex-protecting composition for the natural rubber latex.
The detection shows that the finished product of the plant milk retention composition for the natural rubber latex is white semitransparent crystal, is easy to dissolve in water, and has 0.11 percent of volatile matter, 0.09 percent of ash content, 9.5 percent of PH, 99.75 percent of ethyl acetate dissolved matter and 0.04 percent of screen residue.
Example 4
The preparation method of the environment-friendly granular tobacco flake adhesive comprises the following steps:
raw materials: examples 1-3 plant milk retention compositions for natural rubber latex were prepared;
1) adding the plant latex-preserving compositions for preparing the natural rubber latex in example 1 to example 3 to the fresh latex respectively;
the following two cases are classified according to the addition sites:
1.1) on-site addition mode: stirring and diluting the plant milk retention composition for the natural rubber latex in warm water at the temperature of 25-35 ℃, and mixing the plant milk retention composition for the natural rubber latex and the water according to the weight ratio of 1:4 to obtain a 20% plant milk retention composition aqueous solution for the natural rubber latex;
the time from tapping to rubber collecting is about 5-10 h, the specification of a common rubber barrel is 20-25 Kg, 20% of plant latex-preserving composition aqueous solution for natural rubber latex is placed into the rubber barrel according to the requirement, the addition amount is 1.0-1.5% of the content of the natural rubber latex (the dry content of the natural rubber latex is 25-40%), the addition amount is properly adjusted according to different seasons, and the specific addition amount is shown in Table 1.
When the plant milk retention composition aqueous solution for preparing 20% of natural rubber milk is put into the rubber barrel, the plant milk retention composition aqueous solution needs to be stirred continuously so as to be fully and uniformly dissolved in the rubber milk.
TABLE 1 amount of emulsion-preserving composition for different tapping seasons
| Rubber tapping season | Dosage of plant emulsion-protecting composition (20% aqueous solution) for natural rubber emulsion |
| 4-5 months | 1.0% (natural rubber latex content 35-40%) |
| 6-10 months | 1.5% (natural rubber latex content 25-40%) |
| 11-12 months | 1.0% (natural rubber latex content 20-25%) |
| Joining location | Glue factory |
1.2) adding mode of a glue collecting station: the plant latex-preserving composition for natural rubber latex can be uniformly added into the rubber collecting station within 5 hours from the time of collecting the latex to the rubber collecting station.
2) Adopting a glue collecting station adding mode
2.1) preparation of aqueous solution of plant milk retention composition for natural rubber latex:
weighing the plant milk retention composition for the natural rubber latex prepared in the embodiment 1, and dissolving the plant milk retention composition with warm water at 25-35 ℃ to obtain 20% of plant milk retention composition water solution for the natural rubber latex in weight ratio;
weighing the plant milk retention composition for the natural rubber latex in the embodiment 2, and dissolving the plant milk retention composition with warm water at the temperature of 25-35 ℃ to obtain 20% of plant milk retention composition aqueous solution for the natural rubber latex in weight ratio;
weighing the plant milk retention composition for the natural rubber latex in the embodiment 3, and dissolving the plant milk retention composition with warm water at the temperature of 25-35 ℃ to obtain 20% of plant milk retention composition aqueous solution for the natural rubber latex in weight ratio;
2.2) latex purification: before the fresh latex is poured into the mixing pool, a filtering sieve with the specification of a 48-micron sieve is used for filtering to remove large impurities such as sand, wood dust, iron scraps, leaves and the like in the latex.
2.3) adding to the fresh natural latex a plant milk retention composition for natural rubber latex: an aqueous solution of the plant milk retention composition for natural rubber latex was added to the natural rubber latex in the addition amounts shown in table 1 according to the actual season time, and the stirring was continued.
The natural latex is obtained in the actual use process, the fresh rubber latex can be stored for more than 20h by adopting the natural latex which is newly cut from a rubber tapping place, a rubber collecting point and a rubber factory according to the adding amount operation shown in the table 1 in any season, the fresh latex added with the plant latex-protecting composition for the natural rubber latex prepared by the invention can not be self-coagulated in the rubber tapping, rubber collecting and rubber processing processes, the storage time can reach more than 60 days, and the reliable guarantee is provided for the preservation of the latex.
3) Demulsifying processing-preparing environment-friendly granular tobacco flake glue
Adding a demulsifier into the natural rubber latex after the plant latex-preserving composition water solution for the natural rubber latex is added to coagulate the latex, wherein the addition amount of the demulsifier is 1-1.5% of the weight of the natural rubber latex.
Putting the coagulum into a creping machine for creping, conveying crepe sheets to the creping machine set for creping again after the crepe sheets are washed back and forth in a washing pool, then cutting the crepe sheets into particles with the size of 3mm-5mm by a pelletizer, and drying the particles for 3h-4h at the temperature of 60-70 ℃ to obtain the environment-friendly particle tobacco sheet adhesive.
Test for inspection
The plant latex-protecting composition for natural rubber latex prepared by the method and the environment-friendly granular tobacco flake adhesive are subjected to performance comparison test, and the test method and the result are as follows:
1. basic Performance test of plant latex-protecting composition for Natural rubber latex
The plant milk retention compositions for natural rubber milk of examples 1 to 3 were tested for volatiles, ash, pH, and ethyl acetate solubles, and the test items and results are shown in table 2 according to the methods and results, wherein the methods for detecting the physicochemical indices are in accordance with GB/T19281-2014.
TABLE 2 test standards for the botanical latex compositions for natural rubber latex of the present invention
As shown in Table 2, the plant milk-retaining compositions for natural rubber latex of examples 1 to 3 were white translucent crystalline particles in appearance, and the results of volatile matter, ash content, pH, ethyl acetate dissolved matter, and screen residue were in accordance with the technical standards.
Through detection, finished products of the plant milk retention composition for the natural rubber latex prepared in the embodiments 1 to 3 of the invention are white semitransparent crystals in appearance, are easy to dissolve in water, have 0.11 to 0.23 percent of volatile matters, 0.04 to 0.09 percent of ash, 9.4 to 9.5 of PH, 99.73 to 99.75 percent of ethyl acetate dissolved matters and 0.04 to 0.06 percent of screen residues, and all meet the labeling regulations of the plant milk retention composition for the existing natural rubber latex.
2. The plant latex-protecting composition for natural rubber latex is applied to the performance test of a finished product prepared from the natural rubber latex. In example 4, the environmental protection type granulated tobacco flake adhesive prepared in examples 1 to 3 is subjected to performance comparison tests, and a control group is a rubber product which is prepared by performing emulsion retention and emulsion breaking processing by using commercially available ammonia and formic acid and has a dry adhesive content of 35 to 40 percent. The test standard is as follows: GB/T8081-2018 Natural crude rubber technology grading rubber (TSR) specification guide rule, test items and results are shown in Table 3, and Table 3 shows that the plant latex-protecting composition for natural rubber latex is used in the indexes of the natural rubber latex part
The test results are shown in table 3, and the test results of example 4 on the impurities, ash content, nitrogen content, volatile matter, initial plastic value (Po) and plastic retention rate (PRI) of the environment-friendly granulated tobacco flake glue prepared in examples 1 to 3 are all superior to those of the control group; particularly, the test results of Mooney viscosity, tensile strength, elongation at break, 300% stress at definite elongation and tear strength are obviously superior to the milk retention performance of the ammonia and formic acid sold in the control group.
3. The performance test of the finished product prepared by applying the plant latex-protecting composition for the natural rubber latex to the natural rubber latex
The environmental protection type particle smoked sheet rubber prepared in the example 4 is examined, and the control group is a rubber product with 35% -40% of dry rubber content, which is prepared by using commercially available ammonia and formic acid for emulsion preservation processing. The test standard is as follows: GB/T8289-2016 specification for concentrated natural latex ammonia storage centrifugation or creamed latex, the test items and results are shown in Table 4.
TABLE 4 the plant latex-protecting composition for natural rubber latex of the present invention is used in the index of natural rubber latex part
As can be seen from the test results in Table 4, the average values of the total solid content, dry gum content, coagulum content, residue content, volatile fatty acid value, mechanical stability and KOH value of the glue for environmental protection granulated tobacco flakes prepared by the method in example 4 are all better than those of the ammonia water and formic acid which are commercially available in the control group. The above is the standard for concentrated natural latex, and the test gum is 35-40% dry content, which is adopted in this test. The biological latex-protecting plant extract is used in natural rubber latex, is equal to natural rubber, can be mixed with various synthetic rubbers for use, and can be applied to the preparation of various tires and rubber products.
The plant milk-preserving composition for the natural rubber latex can replace ammonia water for preservation, and has no irritation, no side effect, no toxicity, no harm to human body and no pollution to ecological environment. The plant latex-preserving composition for the natural rubber latex can keep fresh of fresh latex at normal temperature for more than 60 days without changing texture, mildewing, deterioration and solidification, and obviously improves the quality of the natural rubber latex. The plant latex-protecting composition for natural rubber latex can greatly improve the tensile strength, tensile stress, tearing strength and the like of rubber compound; the yield of the latex finished product is obviously improved, and the dry glue content of the processed latex is obviously higher than that of the dry glue prepared from the rubber latex preserved by ammonia water and solidified by formic acid by more than 5 percent.
The main components used in the invention have the functions as follows:
the antioxidant active compounds in the wild sweet potato seed extract are 5-0-caffeoylquinic acid, 3-0-caffeoylquinic acid and 4-0-caffeoylquinic acid, have free radical scavenging ability and reducing power, and have effects of inhibiting protein and fatty acid mutant cells;
the lemon extract contains various flavonoids such as hesperidin, naringin, and Citrus limonum pericarp, has chelation effect and strong antioxidant property, and has synergistic antibacterial and antioxidant effects with antioxidant active compounds such as 5-0-caffeoylquinic acid, 3-0-caffeoylquinic acid and 4-0-caffeoylquinic acid;
the anthocyanin which is the main extract of the wild grape is a bioflavonoid with a special molecular structure and is an effective natural antioxidant;
the extract of wild loquat is mainly cellulose, pectin, carotene, malic acid and citric acid, and has antioxidant function;
sodium nitrite, calcium formate: has antibacterial and deodorant effects;
ascorbic acid: because of containing high vitamin C, the product has strong oxidation resistance, free radical resistance, fresh keeping and corrosion prevention. Can effectively prevent the generation of protein, fatty acid, saccharide and fat through mildewing and putrefaction, and has the functions of reduction and antisepsis;
calcium propionate: has broad antibacterial effects against mold and bacteria;
propyl p-hydroxybenzoate: has emulsifying, stabilizing, antiseptic, sterilizing, antioxidant, antiaging and fresh-keeping effects, and can reduce damage of ultraviolet radiation in sunlight to natural rubber latex.
Baking soda powder: the sodium bicarbonate has color fixing and acid-base buffering effects.
In conclusion, the plant latex-protecting composition for the natural rubber latex is alkalescent, has no destructive effect on the natural rubber latex (high polymer material), can keep fresh of fresh latex at normal temperature for more than 60 days by detection, has no deterioration, no mildew and no emulsion breaking effect, obviously improves the quality of the natural rubber latex, has no side effect, and also improves the physical and mechanical properties of the natural rubber; in addition, the natural rubber latex is non-toxic, non-irritant and non-harmful to human bodies, can completely replace emulsion-protecting ammonia water in the prior art to keep the natural rubber latex fresh, is environment-friendly, and accords with the green and environment-friendly idea pursued at present. Therefore, the physical and mechanical properties of the finished product of the environment-friendly granular tobacco sheet adhesive are higher than those of tobacco sheet adhesives made from ammonia and formic acid. The preparation method of the environment-friendly granulated tobacco tablet is simple, the environment-friendly granulated tobacco tablet is added according to the specified amount and then is fully stirred, the dry content and the total solid content of rubber are increased, the quality of the rubber is improved, and particularly the strength, the fixed elongation and the aging resistance are greatly improved. The method is basically consistent with the production process of the rubber with ammonia, does not need to increase equipment, and can completely use the production process and equipment with ammonia.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (9)
1. A plant milk retention composition for natural rubber latex is characterized by comprising the following components: the wild sweet potato, lemon, wild grape, wild loquat, green jujube, Chinese hawthorn and functional materials, wherein the functional materials are as follows: a combination of sodium nitrite, calcium formate, ascorbic acid, calcium propionate, propyl hydroxybenzoate and sodium bicarbonate.
2. The plant milk retention composition for natural rubber latex according to claim 1, wherein the weight percentages of the components in the plant milk retention composition for natural rubber latex are as follows, based on 100% of the total weight of the plant milk retention composition for natural rubber latex: 5 to 8 percent of wild sweet potato, 20 to 30 percent of lemon, 18 to 22 percent of wild grape, 30 to 38 percent of wild loquat, 3 to 5 percent of green date, 10 to 20 percent of Chinese hawthorn and 20 to 30 percent of functional material;
the functional material comprises the following components in percentage by weight: 2 to 4 percent of mixture of sodium nitrite and calcium formate, 8 to 12 percent of ascorbic acid, 2 to 3 percent of calcium propionate, 6 to 8 percent of propyl p-hydroxybenzoate and 2 to 2.5 percent of sodium bicarbonate.
3. The plant milk retention composition for natural rubber latex as claimed in claim 1, wherein the weight ratio of sodium nitrite to calcium formate in the mixture of sodium nitrite and calcium formate is 2: 10.
4. A method for preparing a plant milk retention composition for natural rubber latex according to any one of claims 1 to 3, characterized in that the steps comprise:
(1) respectively weighing wild yam, lemon, wild grape, wild loquat, green date and Chinese hawthorn according to a set weight ratio, cleaning, airing, dehydrating, crushing, mixing and extruding to form a mixture before extraction;
(2) placing the pre-extraction mixture prepared in the step (1) and an extracting agent into a rapid solvent extraction apparatus, and performing gradient extraction treatment in sequence to obtain an extraction solution; standing the extractive solution for precipitation, collecting supernatant, filtering, mixing all extractive solutions, concentrating, drying, and pulverizing to obtain powder A;
(3) and (3) adding the weighed mixture of the functional materials of sodium nitrite, calcium formate, ascorbic acid, calcium propionate, propyl hydroxybenzoate and sodium bicarbonate powder into the powder A prepared in the step (2), pouring the mixture into a high-speed crushing stirrer, and uniformly mixing and crushing to obtain the plant latex-protecting composition for the natural rubber latex.
5. The method of claim 4 for preparing a botanical emulsion-preserving composition for natural rubber latex, wherein: in the step (2), the extracting agent is ethyl acetate-water mixed solution, wherein the mass percent of the ethyl acetate is 10-30%; the weight ratio of the mixture before extraction to the extractant is 1: 5-10.
6. The method of claim 4 for preparing a botanical emulsion-preserving composition for natural rubber latex, wherein: the condition parameters of the gradient extraction by using the rapid solvent extractor in the step (2) are as follows: the pump flow rate is 80mL/min, the used gas is nitrogen, the pressure is 1000Psi, the temperature is 65-80 ℃, the extraction is carried out for 3-5 times, and the extraction time is 2.5-3.5 h each time.
7. The method of preparing a botanical emulsion-preserving composition for natural rubber latex as claimed in claim 4, wherein: the method for filtering the supernatant in the step (2) comprises the following steps: filtering with a multilayer filter sieve device, wherein the pore diameters of the multilayer filter sieve are respectively 38 mu m, 45 mu m and 48 mu m standard sieve from the upper layer to the lower layer.
8. The method of claim 4 for preparing a botanical emulsion-preserving composition for natural rubber latex, wherein: in the step (2), the drying temperature is 40-50 ℃, the drying time is 2-3 h, and the moisture content of the dried powder A is less than or equal to 0.2%.
9. Use of a plant milk retention composition for natural rubber latex according to any of claims 1 to 8, characterized in that it is used for the preparation of an environmentally friendly granulated tobacco sheet gum.
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| CN102358789A (en) * | 2011-08-09 | 2012-02-22 | 北京天一瑞博生物科技有限公司 | Natural rubber latex anticoagulating and antistaling agent and preservation method thereof |
| CN107236060A (en) * | 2017-07-19 | 2017-10-10 | 海南职业技术学院 | Rubber is gathered and guarantor property method |
| CN111303316A (en) * | 2020-01-14 | 2020-06-19 | 青岛金瑞纳橡胶科技有限公司 | Natural latex biological anticoagulant, preparation method thereof and preparation method of environment-friendly rubber |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102358789A (en) * | 2011-08-09 | 2012-02-22 | 北京天一瑞博生物科技有限公司 | Natural rubber latex anticoagulating and antistaling agent and preservation method thereof |
| CN107236060A (en) * | 2017-07-19 | 2017-10-10 | 海南职业技术学院 | Rubber is gathered and guarantor property method |
| CN111303316A (en) * | 2020-01-14 | 2020-06-19 | 青岛金瑞纳橡胶科技有限公司 | Natural latex biological anticoagulant, preparation method thereof and preparation method of environment-friendly rubber |
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