CN115710322B - Concentrated natural latex ammonia-free composite preservative - Google Patents
Concentrated natural latex ammonia-free composite preservative Download PDFInfo
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- CN115710322B CN115710322B CN202110966849.4A CN202110966849A CN115710322B CN 115710322 B CN115710322 B CN 115710322B CN 202110966849 A CN202110966849 A CN 202110966849A CN 115710322 B CN115710322 B CN 115710322B
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- ammonia
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- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 239000003755 preservative agent Substances 0.000 title claims abstract description 19
- 230000002335 preservative effect Effects 0.000 title claims abstract description 19
- 239000002131 composite material Substances 0.000 title claims abstract description 17
- 239000003381 stabilizer Substances 0.000 claims abstract description 14
- 239000004094 surface-active agent Substances 0.000 claims abstract description 13
- 150000004957 nitroimidazoles Chemical class 0.000 claims abstract description 12
- 230000000844 anti-bacterial effect Effects 0.000 claims abstract description 11
- 239000003899 bactericide agent Substances 0.000 claims abstract description 11
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 claims abstract description 9
- FGVVTMRZYROCTH-UHFFFAOYSA-N pyridine-2-thiol N-oxide Chemical compound [O-][N+]1=CC=CC=C1S FGVVTMRZYROCTH-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229960002026 pyrithione Drugs 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims abstract description 5
- IPWKIXLWTCNBKN-UHFFFAOYSA-N Madelen Chemical compound CC1=NC=C([N+]([O-])=O)N1CC(O)CCl IPWKIXLWTCNBKN-UHFFFAOYSA-N 0.000 claims abstract description 4
- HJLSLZFTEKNLFI-UHFFFAOYSA-N Tinidazole Chemical compound CCS(=O)(=O)CCN1C(C)=NC=C1[N+]([O-])=O HJLSLZFTEKNLFI-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229960000282 metronidazole Drugs 0.000 claims abstract description 4
- VAOCPAMSLUNLGC-UHFFFAOYSA-N metronidazole Chemical compound CC1=NC=C([N+]([O-])=O)N1CCO VAOCPAMSLUNLGC-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229960002313 ornidazole Drugs 0.000 claims abstract description 4
- XNRNJIIJLOFJEK-UHFFFAOYSA-N sodium;1-oxidopyridine-2-thione Chemical compound [Na+].[O-]N1C=CC=CC1=S XNRNJIIJLOFJEK-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229960005053 tinidazole Drugs 0.000 claims abstract description 4
- 229940043810 zinc pyrithione Drugs 0.000 claims abstract description 4
- PICXIOQBANWBIZ-UHFFFAOYSA-N zinc;1-oxidopyridine-2-thione Chemical compound [Zn+2].[O-]N1C=CC=CC1=S.[O-]N1C=CC=CC1=S PICXIOQBANWBIZ-UHFFFAOYSA-N 0.000 claims abstract description 4
- KPQZUUQMTUIKBP-UHFFFAOYSA-N 1-(2-methyl-5-nitro-1-imidazolyl)-2-propanol Chemical compound CC(O)CN1C(C)=NC=C1[N+]([O-])=O KPQZUUQMTUIKBP-UHFFFAOYSA-N 0.000 claims abstract description 3
- MNHVNIJQQRJYDH-UHFFFAOYSA-N 2-[2-(1-chlorocyclopropyl)-3-(2-chlorophenyl)-2-hydroxypropyl]-1,2-dihydro-1,2,4-triazole-3-thione Chemical compound N1=CNC(=S)N1CC(C1(Cl)CC1)(O)CC1=CC=CC=C1Cl MNHVNIJQQRJYDH-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000005825 Prothioconazole Substances 0.000 claims abstract description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000004202 carbamide Substances 0.000 claims abstract description 3
- SDIXRDNYIMOKSG-UHFFFAOYSA-L disodium methyl arsenate Chemical compound [Na+].[Na+].C[As]([O-])([O-])=O SDIXRDNYIMOKSG-UHFFFAOYSA-L 0.000 claims abstract description 3
- OEXHQOGQTVQTAT-JRNQLAHRSA-N ipratropium Chemical compound O([C@H]1C[C@H]2CC[C@@H](C1)[N@@+]2(C)C(C)C)C(=O)C(CO)C1=CC=CC=C1 OEXHQOGQTVQTAT-JRNQLAHRSA-N 0.000 claims abstract description 3
- 229960001888 ipratropium Drugs 0.000 claims abstract description 3
- 229960004076 secnidazole Drugs 0.000 claims abstract description 3
- 125000005323 thioketone group Chemical class 0.000 claims abstract 6
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 15
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- KAKVFSYQVNHFBS-UHFFFAOYSA-N (5-hydroxycyclopenten-1-yl)-phenylmethanone Chemical compound OC1CCC=C1C(=O)C1=CC=CC=C1 KAKVFSYQVNHFBS-UHFFFAOYSA-N 0.000 claims description 3
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 3
- 229920000191 poly(N-vinyl pyrrolidone) Polymers 0.000 claims description 3
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 claims description 2
- 229910000397 disodium phosphate Inorganic materials 0.000 claims description 2
- 235000019800 disodium phosphate Nutrition 0.000 claims description 2
- 235000011118 potassium hydroxide Nutrition 0.000 claims description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 2
- 235000017550 sodium carbonate Nutrition 0.000 claims description 2
- BTURAGWYSMTVOW-UHFFFAOYSA-M sodium dodecanoate Chemical compound [Na+].CCCCCCCCCCCC([O-])=O BTURAGWYSMTVOW-UHFFFAOYSA-M 0.000 claims description 2
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 2
- 229940082004 sodium laurate Drugs 0.000 claims description 2
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 claims 1
- 229920000126 latex Polymers 0.000 abstract description 57
- 239000004816 latex Substances 0.000 abstract description 56
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 48
- 229910021529 ammonia Inorganic materials 0.000 abstract description 27
- 238000004321 preservation Methods 0.000 abstract description 14
- 239000000084 colloidal system Substances 0.000 abstract description 2
- 238000004090 dissolution Methods 0.000 abstract description 2
- 230000000638 stimulation Effects 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 235000014113 dietary fatty acids Nutrition 0.000 description 15
- 239000000194 fatty acid Substances 0.000 description 15
- 229930195729 fatty acid Natural products 0.000 description 15
- 150000004665 fatty acids Chemical class 0.000 description 15
- 238000003860 storage Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- 239000003814 drug Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 244000043261 Hevea brasiliensis Species 0.000 description 6
- SKOLWUPSYHWYAM-UHFFFAOYSA-N carbonodithioic O,S-acid Chemical class SC(S)=O SKOLWUPSYHWYAM-UHFFFAOYSA-N 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 239000004636 vulcanized rubber Substances 0.000 description 6
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 229920001971 elastomer Polymers 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229920003052 natural elastomer Polymers 0.000 description 4
- 229920001194 natural rubber Polymers 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- QNBTYORWCCMPQP-JXAWBTAJSA-N (Z)-dimethomorph Chemical compound C1=C(OC)C(OC)=CC=C1C(\C=1C=CC(Cl)=CC=1)=C/C(=O)N1CCOCC1 QNBTYORWCCMPQP-JXAWBTAJSA-N 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 2
- 239000005761 Dimethomorph Substances 0.000 description 2
- YNAVUWVOSKDBBP-UHFFFAOYSA-N Morpholine Chemical class C1COCCN1 YNAVUWVOSKDBBP-UHFFFAOYSA-N 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000007794 irritation Effects 0.000 description 2
- 150000002780 morpholines Chemical class 0.000 description 2
- 229920001206 natural gum Polymers 0.000 description 2
- DAJSVUQLFFJUSX-UHFFFAOYSA-M sodium;dodecane-1-sulfonate Chemical compound [Na+].CCCCCCCCCCCCS([O-])(=O)=O DAJSVUQLFFJUSX-UHFFFAOYSA-M 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000004073 vulcanization Methods 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- JIHQDMXYYFUGFV-UHFFFAOYSA-N 1,3,5-triazine Chemical compound C1=NC=NC=N1 JIHQDMXYYFUGFV-UHFFFAOYSA-N 0.000 description 1
- 229920001661 Chitosan Polymers 0.000 description 1
- AVXURJPOCDRRFD-UHFFFAOYSA-N Hydroxylamine Chemical compound ON AVXURJPOCDRRFD-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005862 Whey Substances 0.000 description 1
- 102000007544 Whey Proteins Human genes 0.000 description 1
- 108010046377 Whey Proteins Proteins 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000002313 adhesive film Substances 0.000 description 1
- 238000012271 agricultural production Methods 0.000 description 1
- -1 ammonia compound Chemical class 0.000 description 1
- 229940056585 ammonium laurate Drugs 0.000 description 1
- 239000008346 aqueous phase Substances 0.000 description 1
- VJCJAQSLASCYAW-UHFFFAOYSA-N azane;dodecanoic acid Chemical compound [NH4+].CCCCCCCCCCCC([O-])=O VJCJAQSLASCYAW-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 235000014633 carbohydrates Nutrition 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229920003211 cis-1,4-polyisoprene Polymers 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- XKLJHFLUAHKGGU-UHFFFAOYSA-N nitrous amide Chemical compound ON=N XKLJHFLUAHKGGU-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 150000003904 phospholipids Chemical class 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 238000010057 rubber processing Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- HCJLVWUMMKIQIM-UHFFFAOYSA-M sodium;2,3,4,5,6-pentachlorophenolate Chemical compound [Na+].[O-]C1=C(Cl)C(Cl)=C(Cl)C(Cl)=C1Cl HCJLVWUMMKIQIM-UHFFFAOYSA-M 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
Classifications
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/30—Against vector-borne diseases, e.g. mosquito-borne, fly-borne, tick-borne or waterborne diseases whose impact is exacerbated by climate change
Abstract
The invention provides a concentrated natural latex ammonia-free composite preservative, which comprises a bactericide, an alkaline stabilizer and a surfactant, wherein the bactericide is a mixture of a thioketone derivative and a nitroimidazole derivative; the thioketone derivative is at least one of pyrithione, zinc pyrithione, sodium pyrithione, pyrithione urea and prothioconazole; the nitroimidazole derivative is at least one of tinidazole, ornidazole, metronidazole, dimet imidazole, ipratropium dazole and secnidazole. Can form stable colloid with concentrated natural latex to form a novel composite preservation system, has the characteristics of no ammonia, no volatilization, no stimulation and easy water dissolution, can effectively preserve the concentrated natural latex for more than 6 months, and has good comprehensive performance of the prepared ammonia-free concentrated latex.
Description
Technical Field
The invention relates to the field of natural rubber processing, in particular to an ammonia-free compound preservative for concentrated natural latex.
Background
The natural rubber is a polymer material which is naturally synthesized by the Hevea bassinensis and is divided into natural rubber raw rubber and concentrated natural latex according to the process requirement. The natural latex directly collected from the rubber tree is called fresh latex, is a natural macromolecular emulsion formed by dispersing rubber particles in an aqueous phase (namely whey), and the total solid content of the fresh natural latex is greatly different and is generally 20-45%. In fresh natural latex, there is also a large amount of non-rubber substances, in an amount corresponding to 5% of the total weight of the latex. For this purpose, it is necessary to increase the total solid content of the fresh natural latex to about 60% by a centrifugal concentration process or the like, and to reduce the non-rubber content to 2% or less. The natural latex obtained is referred to as a centrifugally concentrated natural latex.
At present, a composite preservation system of ammonia and ammonia+TT/ZnO is widely adopted in production as a preservative for new latex and concentrated latex to preserve the latex. Because ammonia volatility and irritation cause serious environmental pollution, TT has the risk of generating nitrosamine, the existence of the TT influences the safety of products, znO can influence the stability and the vulcanization performance of latex, and along with the increase of national environmental protection, an ammonia preservation system is eliminated in a long term, so that the development of an efficient and economic ammonia-free preservation system becomes a necessary trend of the development of the natural rubber industry.
In recent years, the annual output of the global concentrated natural latex is more than 100 ten thousand tons, and the latex product prepared by adopting the concentrated latex as a raw material has the advantages of simple process, less power consumption, high degree of automation, excellent product performance and the like, so that the application of the concentrated latex is wider and wider, and the consumption is increased year by year.
However, since natural latex contains a large amount of non-glue components which are easy to degrade, the stability of the latex is seriously damaged by spoilage under the action of bacteria, so that a bactericide is required to be added to maintain the stability of the latex, and high ammonia storage (ammonia content of 0.7%) is generally adopted in the current production, so that the production environment is severe and serious pollution problems exist.
The natural latex has excellent comprehensive performance, is an important industrial raw material, and has wide application in industrial and agricultural production. The concentrated natural latex contains proteins, phospholipids, carbohydrates, etc., and is decomposed and deteriorated by bacteria to destroy the stability of the latex and solidify the latex. Therefore, the bactericide needs to be supplemented to keep the stability of the latex, ammonia and a compound preservative thereof are generally adopted to store the latex in the current production, the storage effect is good, but the ammonia has certain volatility and irritation and certain pollution, and along with the development of industrial upgrading, the ammonia and the compound storage system thereof are surely eliminated.
The concentrated latex sold in the market at home and abroad is basically high-ammonia concentrated latex, and some manufacturers develop a small amount of low-ammonia and ammonia-free concentrated latex, but the problems of poor application performance, high cost and the like generally exist. Scientific researchers at home and abroad have tried to preserve latex by various substances such as sodium pentachlorophenate, hydroxylamine, chitosan, s-triazine and the like for many years, but the wide application of the latex has not been realized yet.
Disclosure of Invention
In view of the above, the present invention provides a concentrated natural latex ammonia-free composite preservative, which solves the above problems.
The technical scheme of the invention is realized as follows:
the ammonia-free composite preservative for the concentrated natural latex comprises a bactericide, an alkaline stabilizer and a surfactant, wherein the bactericide is a mixture of a thioketone derivative and a nitroimidazole derivative.
Further, the thioketone derivative is at least one of pyrithione, zinc pyrithione, sodium pyrithione, urea pyrithione and prothioconazole;
further, the nitroimidazole derivative is at least one of tinidazole, ornidazole, metronidazole, dimet imidazole, ipratropium and secnidazole.
Further, the surfactant is at least one of sodium dodecyl sulfate, potassium laurate, sodium laurate and peregal "O".
Further, the alkaline stabilizer is at least one of sodium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate and sodium hydrogen phosphate.
Further, the use amount of the thioketone derivative is 0.03-0.05 wt% of the natural latex.
Furthermore, the usage amount of the nitroimidazole derivative is 0.01-0.02 wt% of the natural latex.
Further, the alkaline stabilizer is used in an amount of 0.1 to 0.3wt% of the natural latex.
Further, the amount of the surfactant is 0.1 to 0.2wt% of the natural latex.
The ammonia-free composite preservative for concentrated natural latex of any one of the invention comprises the following raw materials in parts by weight per 100 parts of natural latex: 0.03 to 0.05 part of thioketone derivative, 0.01 to 0.04 part of nitroimidazole derivative, 0.1 to 0.3 part of alkaline stabilizer and 0.1 to 0.2 part of surfactant.
Compared with the prior art, the invention has the beneficial effects that:
(1) Aiming at the problems of ammonia and the ammonia compound preservative, the invention adopts a specific bactericide, combines an alkaline stabilizer and a surfactant to form a stable colloid with concentrated natural latex, forms a novel compound preservation system, has the characteristics of no ammonia, no volatilization, no stimulation and easy water dissolution, can effectively preserve the concentrated natural latex for more than 6 months, and the prepared ammonia-free concentrated latex has good comprehensive performance and lower cost.
(2) The novel composite preservation system has good preservation effect on latex, has lower volatile fatty acid value, lower viscosity value and higher stability, and can be suitable for the production needs of various conventional latex products. In addition, the preservative of the invention is also suitable for the production of low ammonia concentrated latex.
Drawings
FIG. 1 is a graph showing the change in volatile fatty acid value of ammonia-free concentrated latex;
FIG. 2 is a graph showing the variation of the viscosity values of ammonia-free concentrated latex;
FIG. 3 is a graph showing the variation in mechanical stability of ammonia-free concentrated latex;
in the figure: ammonia-free 1-4 examples 1-4, respectively, high ammonia was used as a control.
Detailed Description
In order to better understand the technical content of the present invention, the following provides specific examples to further illustrate the present invention.
The experimental methods used in the embodiment of the invention are conventional methods unless otherwise specified.
Materials, reagents, and the like used in the examples of the present invention are commercially available unless otherwise specified.
Example 1
According to 1kg of ammonia-free concentrated natural gum, the added components and the dosage are shown in the following table:
| component (A) | Dosage of | Medicament |
| Thioketone derivative | 0.5g | 0.2g of pyrithione and 0.3g of zinc pyrithione |
| Nitroimidazole derivative | 0.2g | Metronidazole 0.1g, ornidazole 0.1g |
| Surface active agent | 1g | Sodium dodecyl sulfonate 0.5g, potassium laurate 0.5g |
| Alkaline stabilizer | 2g | 1g of sodium hydroxide, 1g of sodium hydrophosphate |
Taking 1kg of ammonia-free concentrated natural latex which is just centrifuged, adding a corresponding amount of medicament under the condition of slow stirring according to the formula table, mixing and stirring uniformly, standing for storage, sampling month by month, and detecting the volatile fatty acid value, viscosity value and mechanical stability. And prepared into vulcanized rubber films for testing tensile strength and tearing strength.
Examples 2 to 4
According to 1kg of ammonia-free concentrated natural gum, the components and the amounts of the components added in examples 2 to 4 are shown in the following table
| Component (A) | Medicament | Example 2 | Example 3 | Example 4 |
| Thioketone derivative | Sodium pyrithione | 0.3g | 0.4g | 0.3g |
| Nitroimidazole derivative | Tinidazole | 0.2g | 0.1g | 0.2g |
| Surface active agent | Sodium dodecyl sulfate | 2g | 2g | 1.5g |
| Alkaline stabilizer | Potassium hydroxide | 1g | 3g | 1g |
1kg of ammonia-free concentrated natural latex just centrifuged is taken respectively, corresponding amounts of medicaments are added under the slow stirring condition according to the formula table of the examples 1-3, and the medicaments are mixed and stirred uniformly, then the mixture is stood for storage, and the samples are taken month by month to detect the volatile fatty acid value, the viscosity value and the mechanical stability. And prepared into vulcanized rubber films for testing tensile strength and tearing strength.
Comparative example
Taking 1kg of concentrated natural latex just centrifuged, and adopting a traditional high-ammonia preservation method, wherein the ammonia content in a preservation system is 0.7% by mass. The specific operation is as follows: after the fresh latex is centrifuged, the concentration of liquid ammonia is added to 0.7wt% of ammonia, and then 0.06wt% of ammonium laurate is added to improve the mechanical stability. Mixing the agent with concentrated natural latex, stirring, standing, storing, and sampling month by month to detect volatile fatty acid value, viscosity value and mechanical stability. And prepared into vulcanized rubber films for testing tensile strength and tearing strength.
1. Examples 1 to 4 and comparative example preservation Effect
And (3) respectively sampling the latex month by month to detect the volatile fatty acid value, the viscosity value and the mechanical stability of the concentrated latex, and preparing the vulcanized rubber film to test the tensile strength and the tearing strength. The measurement of the physical and mechanical properties of the volatile fatty acid value, the viscosity value, the mechanical stability and the vulcanized adhesive film are referred to GB/T8292-2008, GB/T14797.2-2008, GB8301-2008 and GB/T528-2009, respectively.
(1) Concentrated latex volatilized fatty acid value
As shown in FIG. 1, the high ammonia concentrated latex had a relatively stable early volatile fatty acid value and a slow rise in the latter stage. The volatile fatty acid value of the ammonia-free concentrated latex increases more rapidly in the early stage of storage than that of the high ammonia concentrated latex, and the later stage tends to be stable, which is similar to that of the high ammonia concentrated latex. The volatile fatty acid value increase of the ammonia-free concentrated latices of examples 1 to 4 after 180 days of storage was lower than that of the control, wherein the percentage increase in volatile fatty acid value after 180 days of storage of the concentrated latex was lower with example 1 and the volatile fatty acid value was the lowest, indicating that example 1 had the best effect of inhibiting the increase in volatile fatty acid value of the concentrated latex.
(2) Viscosity number of concentrated latex
As shown in fig. 2, the high ammonia concentrated latex has a lower viscosity number and exhibits a slow down trend during storage. Compared with the high ammonia concentrated latex, after the latex is preserved for 180 days, the viscosity value of the ammonia-free concentrated latex in the examples 1-4 is reduced more than that of the comparative example, and the ammonia-free composite preservative provided by the invention is adopted to effectively reduce the viscosity value of the concentrated latex.
(3) Mechanical stability of concentrated latex
As shown in FIG. 3, the ammonia-free concentrated latex has a smaller difference in mechanical stability from the high ammonia concentrated latex, the high ammonia concentrated latex has a higher alkalinity value and a faster rate of increase in mechanical stability, but a certain degree of decrease occurs at a later stage. The alkalinity value of the ammonia-free concentrated latex is lower, and the mechanical stability of the ammonia-free concentrated latex can be improved by adjusting the dosage of the stabilizer.
Comparative example 1
The difference from example 1 is that the bactericide is replaced by dimethomorph (morpholine derivative).
| Component (A) | Medicament | Dosage of |
| Morpholine derivative | Dimethomorph | 3.5g |
| Surface active agent | Sodium dodecyl sulfonate | 1.5g |
| Alkaline stabilizer | Potassium hydroxide | 1g |
Taking 1kg of ammonia-free concentrated natural latex which is just centrifuged, adding a corresponding amount of medicament under the condition of slow stirring according to the formula table, mixing and stirring uniformly, standing for storage, and sampling and detecting month by month. And prepared into vulcanized rubber films for testing tensile strength.
The results show that the morpholine derivative bactericide also has a certain preservation effect on natural latex, the prepared ammonia-free concentrated latex has slightly higher volatile fatty acid value, and in addition, the latex has normal viscosity value, but lower mechanical stability and poorer latex stability, and the results show that the preservation effect of the examples on the ammonia-free concentrated latex is better than that of the comparative examples.
2. Tensile Strength and tear Strength test (preparation of vulcanized rubber)
The concentrated natural latex after 180 days of preservation of examples 1-4 and comparative example was prepared into a vulcanized film according to the following vulcanization formulation, which consists of the following components (in parts by weight): 100 parts of natural latex, 0.45 part of zinc oxide, 1.0 part of sulfur, 0.5 part of ZDC, 0.15 part of peregal O and 0.25 part of potassium hydroxide. Tensile strength and tear strength were tested. The results are shown in the following table:
| tensile Strength (MPa) | Tear Strength (kN/m) | |
| Comparative example | 26.5 | 39.9 |
| Example 1 | 27.2 | 45.8 |
| Example 2 | 25.5 | 42.0 |
| Example 3 | 26.9 | 40.4 |
| Example 4 | 27.1 | 51.2 |
| Comparative example 1 | 22.4 | 35.1 |
The results show that the ammonia-free concentrated latex vulcanized film prepared from the concentrated natural latex obtained after 180 days of preservation in examples 1-4 has good physical and mechanical properties, and has higher tensile strength and tear strength, especially higher tear strength than that in comparative example 1, and the ammonia-free composite preservative provided by the invention has a certain improvement effect on the mechanical properties of the concentrated latex.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (6)
1. The ammonia-free composite preservative for the concentrated natural latex is characterized by comprising a bactericide, a surfactant and an alkaline stabilizer, wherein the bactericide is a mixture of a thioketone derivative and a nitroimidazole derivative; the thioketone derivative is at least one of pyrithione, zinc pyrithione, sodium pyrithione, pyrithione urea and prothioconazole; the nitroimidazole derivative is at least one of tinidazole, ornidazole, metronidazole, dimet imidazole, ipratropium dazole and secnidazole;
the dosage of the thioketone derivative is 0.03-0.05wt% of the natural latex;
the usage amount of the nitroimidazole derivative is 0.01-0.02 wt% of the natural latex.
2. The concentrated natural latex ammonia-free composite preservative according to claim 1, wherein the surfactant is at least one of sodium dodecyl sulfate, potassium laurate, sodium laurate, peregal "O".
3. The ammonia-free composite preservative for concentrated natural latex according to claim 1, wherein the alkaline stabilizer is at least one of sodium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate, and sodium hydrogen phosphate.
4. The concentrated natural latex ammonia-free composite preservative of claim 1 or 2, wherein the surfactant is present in an amount of 0.1 to 0.2wt% of the natural latex.
5. The concentrated natural latex ammonia-free composite preservative of claim 1 or 3, wherein the alkaline stabilizer is used in an amount of 0.1 to 0.3wt% of the natural latex.
6. The concentrated natural latex ammonia-free composite preservative of any one of claims 1-5, wherein the following raw materials are used per 100 parts natural latex by weight: 0.03 to 0.05 part of thioketone derivative, 0.01 to 0.04 part of nitroimidazole derivative, 0.1 to 0.3 part of alkaline stabilizer and 0.1 to 0.2 part of surfactant.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2006056930A (en) * | 2004-08-17 | 2006-03-02 | Regitex Co Ltd | Natural rubber latex |
| CN103113631A (en) * | 2012-12-27 | 2013-05-22 | 中国热带农业科学院农产品加工研究所 | Ammonia-free preservation system for natural latex |
| CN108659146A (en) * | 2018-05-29 | 2018-10-16 | 泰国素万寝具用品（中国）有限公司 | Heveatex preservative agent and preparation method thereof and its application |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006056930A (en) * | 2004-08-17 | 2006-03-02 | Regitex Co Ltd | Natural rubber latex |
| CN103113631A (en) * | 2012-12-27 | 2013-05-22 | 中国热带农业科学院农产品加工研究所 | Ammonia-free preservation system for natural latex |
| CN108659146A (en) * | 2018-05-29 | 2018-10-16 | 泰国素万寝具用品（中国）有限公司 | Heveatex preservative agent and preparation method thereof and its application |
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