CN117088999A - Natural latex composite stabilizer and method for rapidly improving mechanical stability of concentrated natural latex - Google Patents
Natural latex composite stabilizer and method for rapidly improving mechanical stability of concentrated natural latex Download PDFInfo
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- CN117088999A CN117088999A CN202311185735.1A CN202311185735A CN117088999A CN 117088999 A CN117088999 A CN 117088999A CN 202311185735 A CN202311185735 A CN 202311185735A CN 117088999 A CN117088999 A CN 117088999A
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- natural latex
- latex
- composite stabilizer
- acid soap
- fatty acid
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- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 title claims abstract description 136
- 239000006084 composite stabilizer Substances 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000000344 soap Substances 0.000 claims abstract description 70
- 229920000126 latex Polymers 0.000 claims abstract description 53
- 239000004816 latex Substances 0.000 claims abstract description 53
- 235000014113 dietary fatty acids Nutrition 0.000 claims abstract description 50
- 239000000194 fatty acid Substances 0.000 claims abstract description 50
- 229930195729 fatty acid Natural products 0.000 claims abstract description 50
- 150000004665 fatty acids Chemical class 0.000 claims abstract description 50
- 235000021355 Stearic acid Nutrition 0.000 claims abstract description 17
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims abstract description 17
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000008117 stearic acid Substances 0.000 claims abstract description 17
- OYHQOLUKZRVURQ-HZJYTTRNSA-N Linoleic acid Chemical compound CCCCC\C=C/C\C=C/CCCCCCCC(O)=O OYHQOLUKZRVURQ-HZJYTTRNSA-N 0.000 claims abstract description 15
- 235000020778 linoleic acid Nutrition 0.000 claims abstract description 15
- OYHQOLUKZRVURQ-IXWMQOLASA-N linoleic acid Natural products CCCCC\C=C/C\C=C\CCCCCCCC(O)=O OYHQOLUKZRVURQ-IXWMQOLASA-N 0.000 claims abstract description 15
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 claims abstract description 15
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 claims abstract description 13
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 claims abstract description 13
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000005642 Oleic acid Substances 0.000 claims abstract description 13
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 claims abstract description 13
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 claims abstract description 13
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 22
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 22
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 20
- 229920001971 elastomer Polymers 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 11
- 239000007864 aqueous solution Substances 0.000 claims description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 6
- 238000005119 centrifugation Methods 0.000 claims description 6
- IPCSVZSSVZVIGE-UHFFFAOYSA-N hexadecanoic acid Chemical compound CCCCCCCCCCCCCCCC(O)=O IPCSVZSSVZVIGE-UHFFFAOYSA-N 0.000 claims description 6
- VKOBVWXKNCXXDE-UHFFFAOYSA-N icosanoic acid Chemical compound CCCCCCCCCCCCCCCCCCCC(O)=O VKOBVWXKNCXXDE-UHFFFAOYSA-N 0.000 claims description 6
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 5
- 229910052700 potassium Inorganic materials 0.000 claims description 5
- 239000011591 potassium Substances 0.000 claims description 5
- SMNDYUVBFMFKNZ-UHFFFAOYSA-N 2-furoic acid Chemical compound OC(=O)C1=CC=CO1 SMNDYUVBFMFKNZ-UHFFFAOYSA-N 0.000 claims description 3
- 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 claims description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 3
- 235000021314 Palmitic acid Nutrition 0.000 claims description 3
- DTOSIQBPPRVQHS-PDBXOOCHSA-N alpha-linolenic acid Chemical compound CC\C=C/C\C=C/C\C=C/CCCCCCCC(O)=O DTOSIQBPPRVQHS-PDBXOOCHSA-N 0.000 claims description 3
- 235000020661 alpha-linolenic acid Nutrition 0.000 claims description 3
- 229960004488 linolenic acid Drugs 0.000 claims description 3
- KQQKGWQCNNTQJW-UHFFFAOYSA-N linolenic acid Natural products CC=CCCC=CCC=CCCCCCCCC(O)=O KQQKGWQCNNTQJW-UHFFFAOYSA-N 0.000 claims description 3
- 229910052744 lithium Inorganic materials 0.000 claims description 3
- WQEPLUUGTLDZJY-UHFFFAOYSA-N n-Pentadecanoic acid Natural products CCCCCCCCCCCCCCC(O)=O WQEPLUUGTLDZJY-UHFFFAOYSA-N 0.000 claims description 3
- 229910052708 sodium Inorganic materials 0.000 claims description 3
- 239000011734 sodium Substances 0.000 claims description 3
- TUNFSRHWOTWDNC-HKGQFRNVSA-N tetradecanoic acid Chemical compound CCCCCCCCCCCCC[14C](O)=O TUNFSRHWOTWDNC-HKGQFRNVSA-N 0.000 claims description 3
- 238000012545 processing Methods 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 11
- 230000002411 adverse Effects 0.000 abstract description 9
- 230000035699 permeability Effects 0.000 abstract description 9
- 238000012360 testing method Methods 0.000 description 18
- 230000032683 aging Effects 0.000 description 17
- 229920006173 natural rubber latex Polymers 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 12
- 239000002245 particle Substances 0.000 description 11
- 150000004668 long chain fatty acids Chemical class 0.000 description 7
- 229910021529 ammonia Inorganic materials 0.000 description 6
- 238000011056 performance test Methods 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- 230000035882 stress Effects 0.000 description 6
- 238000001914 filtration Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 4
- 239000004636 vulcanized rubber Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 3
- SOQQSPURSLWWMI-UHFFFAOYSA-N 1,3-thiazole-4-carbothioamide Chemical compound NC(=S)C1=CSC=N1 SOQQSPURSLWWMI-UHFFFAOYSA-N 0.000 description 2
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 244000043261 Hevea brasiliensis Species 0.000 description 2
- 239000005639 Lauric acid Substances 0.000 description 2
- FVFJGQJXAWCHIE-UHFFFAOYSA-N [4-(bromomethyl)phenyl]methanamine Chemical compound NCC1=CC=C(CBr)C=C1 FVFJGQJXAWCHIE-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 229940088990 ammonium stearate Drugs 0.000 description 2
- -1 and also Chemical compound 0.000 description 2
- JPNZKPRONVOMLL-UHFFFAOYSA-N azane;octadecanoic acid Chemical compound [NH4+].CCCCCCCCCCCCCCCCCC([O-])=O JPNZKPRONVOMLL-UHFFFAOYSA-N 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000002313 adhesive film Substances 0.000 description 1
- 229940056585 ammonium laurate Drugs 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- VJCJAQSLASCYAW-UHFFFAOYSA-N azane;dodecanoic acid Chemical compound [NH4+].CCCCCCCCCCCC([O-])=O VJCJAQSLASCYAW-UHFFFAOYSA-N 0.000 description 1
- LRIHKZMLMWYPFS-UHFFFAOYSA-N azanium;hexadecanoate Chemical compound [NH4+].CCCCCCCCCCCCCCCC([O-])=O LRIHKZMLMWYPFS-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 150000002191 fatty alcohols Chemical class 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 150000002632 lipids Chemical class 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 229920000191 poly(N-vinyl pyrrolidone) Polymers 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 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
- C08C1/02—Chemical or physical treatment of rubber latex before or during concentration
Landscapes
- 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 provides a natural latex composite stabilizer and a method for rapidly improving the mechanical stability of concentrated natural latex, and belongs to the technical field of latex treatment. The natural latex composite stabilizer provided by the invention comprises oleic acid soap, linoleic acid soap, stearic acid soap and auxiliary fatty acid soap. The mechanical stability of the stabilized concentrated natural latex treated by the natural latex composite stabilizer provided by the invention can meet the national standard regulation within 10 days, the tensile strength of the vulcanized film of the stabilized concentrated natural latex product is 29.3-30.1 MPa when the vulcanized film is not aged, the 500% stretching stress is 2.81-3.12 MPa, the stretch-break elongation is 970-1065%, and the gas permeability is 1.6-2.0 cm 3 /cm 2 s.Pa.cm, and can prevent adverse effects on the processing operability of the stabilized concentrated natural latex while rapidly improving the mechanical stability of the stabilized concentrated natural latex.
Description
Technical Field
The invention relates to the technical field of latex treatment, in particular to a natural latex composite stabilizer and a method for rapidly improving the mechanical stability of concentrated natural latex.
Background
Mechanical Stability (MST) is an important parameter reflecting the colloidal stability of concentrated natural latex (CNRL). The concentrated natural latex has poor mechanical stability (mechanical stability is less than 100 s) when just centrifuged, but naturally occurring lipid in the natural latex can be gradually hydrolyzed to generate long-chain fatty acid in the latex storage process, so that the soap ammonium is generated in situ, and the effect of improving the mechanical stability is achieved. In recent years, with the large-area popularization of new rubber tree varieties and the innovation of rubber tapping system in the rubber planting area in China, the problem that the concentrated natural rubber latex has slow rise of mechanical stability and is difficult to reach standards is particularly serious in the initial stage of cutting and the later stage of rubber tapping.
Currently, concentrated natural latex processing plants are primarily designed to provide rapid increases in mechanical stability by the addition of large amounts of lauric acid. However, this method changes the chemical stability of the latex, resulting in poor processing operability in downstream latex product enterprises when using concentrated natural latex, and also, lauric acid soap is extremely prone to foam in the latex, resulting in product quality defects such as pinholes, flow marks, etc.
Therefore, how to quickly improve the mechanical stability and avoid adversely affecting the processing operability of the concentrated natural latex is a technical problem to be solved in the art.
Disclosure of Invention
The invention aims to provide a natural latex composite stabilizer and a method for rapidly improving the mechanical stability of concentrated natural latex. The natural latex composite stabilizer and the method for rapidly improving the mechanical stability of the concentrated natural latex provided by the invention can rapidly improve the mechanical stability and avoid adverse effects on the processing operability of the concentrated natural latex.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a natural latex composite stabilizer, which comprises oleic acid soap, linoleic acid soap, stearic acid soap and auxiliary fatty acid soap.
Preferably, the natural latex composite stabilizer comprises the following components in percentage by weight: 10 to 40 percent of oleic acid soap, 35 to 65 percent of linoleic acid soap, 15 to 35 percent of stearic acid soap and 10 to 25 percent of auxiliary fatty acid soap.
Preferably, the auxiliary fatty acid soap is one or more of water-soluble fatty acid ammonium, water-soluble fatty acid potassium, water-soluble fatty acid sodium and water-soluble fatty acid lithium.
Preferably, the fatty acid in the auxiliary fatty acid soap is one or more of myristic acid, palmitic acid, linolenic acid, arachidic acid and furanic acid.
The invention also provides a method for rapidly improving the mechanical stability of the concentrated natural latex, which adopts the technical scheme, and comprises the following steps:
(1) Pretreating fresh latex to obtain concentrated natural latex;
(2) And (3) mixing the concentrated natural latex obtained in the step (1) with a natural latex composite stabilizer and ammonia water to obtain the stabilized concentrated natural latex.
Preferably, the pretreatment in step (1) includes: fresh latex was filtered and mixed with aqueous ammonia, followed by centrifugation.
Preferably, the addition amount of the ammonia water is 0.1 to 0.6 percent of the mass of the fresh latex.
Preferably, the addition amount of the natural latex composite stabilizer in the step (2) is 0.4-2% of the mass of the dry rubber in the concentrated natural latex.
Preferably, the natural latex composite stabilizer is used in the form of an aqueous solution; the mass concentration of the natural latex composite stabilizer in the aqueous solution is 5-15%.
Preferably, the addition amount of the ammonia water in the step (2) is 0.06-1% of the mass of the concentrated natural latex
The invention provides a natural latex composite stabilizer, which comprises oleic acid soap, linoleic acid soap, stearic acid soap and auxiliary fatty acid soap. The invention rapidly improves the mechanical stability of the concentrated natural latex by utilizing long-chain fatty acids contained in oleic acid soap, linoleic acid soap, stearic acid soap and auxiliary fatty acid soap in the natural latex composite stabilizer, and utilizes a plurality of long-chain fatty acidsThe combined action achieves the combined action which is not possessed by single fatty acid, and simultaneously avoids the adverse effect on the processing operability of the concentrated natural latex. The results of the examples show that the Mechanical Stability (MST) of the stabilized concentrated natural latex treated by the natural latex composite stabilizer provided by the invention can meet the national standard regulation (MST is more than or equal to 650 s) within 10 days, the tensile strength of the vulcanized rubber film of the stabilized concentrated natural latex product is 29.3-30.1 MPa, the 500% stretching stress is 2.81-3.12 MPa, the elongation at break is 970-1065%, and the gas permeability is 1.6-2.0 cm when the vulcanized rubber film is not aged 3 /cm 2 s.Pa.cm, the tensile strength is improved by 10% or more, the elongation at break is improved by 12.7% or more, and the gas permeability is reduced by 13% or more, so that the mechanical stability of the stabilized concentrated natural latex can be rapidly improved and the adverse effect on the processing operability of the stabilized concentrated natural latex can be avoided.
Detailed Description
The invention provides a natural latex composite stabilizer, which comprises oleic acid soap, linoleic acid soap, stearic acid soap and auxiliary fatty acid soap.
In the invention, the natural latex composite stabilizer preferably comprises the following components in percentage by weight: 10 to 40 percent of oleic acid soap, 35 to 65 percent of linoleic acid soap, 15 to 35 percent of stearic acid soap and 10 to 25 percent of auxiliary fatty acid soap.
The natural latex composite stabilizer provided by the invention preferably comprises 10-40% of oleic soap, more preferably 10-20% and even more preferably 10-15% by weight; the oleic soap is preferably ammonium oleate. According to the invention, by adding the oleic acid soap and limiting the content and the type of the oleic acid soap to the above range, the negative charge on the surface of the rubber particles can be rapidly increased, and the stability of the rubber particles in the latex can be improved.
The natural latex composite stabilizer of the invention preferably comprises 35 to 65 percent of linoleic acid soap, more preferably 45 to 65 percent, and even more preferably 55 to 65 percent; the linoleic acid soap is preferably potassium linoleate. According to the invention, the negative charge on the surface of the rubber particles can be rapidly increased and the stability of the rubber particles in the latex can be improved by adding the linoleic acid soap and limiting the content and the type of the linoleic acid soap to the above ranges.
The natural latex composite stabilizer of the invention preferably comprises 15-35% of stearic acid soap, more preferably 15-25% of stearic acid soap, and even more preferably 15-20% of stearic acid soap; the stearic acid soap is preferably ammonium stearate. The invention can rapidly increase the negative charge on the surface of the rubber particles and improve the stability of the rubber particles in the latex by adding the stearic acid soap and limiting the content and the type of the stearic acid soap to the above range.
The natural latex composite stabilizer of the present invention preferably comprises 10 to 25% by weight of auxiliary fatty acid soap, more preferably 10 to 20% by weight, still more preferably 10 to 15% by weight. According to the invention, the negative charge on the surface of the rubber particles can be rapidly increased and the stability of the rubber particles in the latex can be improved by adding the auxiliary fatty acid soap and limiting the content of the auxiliary fatty acid soap to the range.
In the present invention, the auxiliary fatty acid soap is preferably one or more of water-soluble fatty acid ammonium, water-soluble fatty acid potassium, water-soluble fatty acid sodium and water-soluble fatty acid lithium, more preferably one or two of water-soluble fatty acid ammonium and water-soluble fatty acid potassium, and still more preferably water-soluble fatty acid ammonium or water-soluble fatty acid potassium. In the present invention, the fatty acid in the auxiliary fatty acid soap is preferably one or more of myristic acid, palmitic acid, linolenic acid, arachidic acid and furanic acid. The invention limits the types of the auxiliary fatty acid soap to the above range, can ensure that all long-chain fatty acids are contained in the natural latex composite stabilizer, further improves the mechanical stability of the concentrated natural latex, and simultaneously avoids adverse effects on the processing operability of the concentrated natural latex.
The invention rapidly improves the mechanical stability of the concentrated natural latex by utilizing the long-chain fatty acid contained in the oleic acid soap, the linoleic acid soap, the stearic acid soap and the auxiliary fatty acid soap in the natural latex composite stabilizer, achieves the comprehensive effect which is not possessed by single fatty acid by utilizing the combined action of a plurality of long-chain fatty acids, and simultaneously avoids the adverse effect on the processing operability of the concentrated natural latex.
The invention also provides a method for rapidly improving the mechanical stability of the concentrated natural latex, which adopts the technical scheme, and comprises the following steps:
(1) Pretreating fresh latex to obtain concentrated natural latex;
(2) And (3) mixing the concentrated natural latex obtained in the step (1) with a natural latex composite stabilizer and ammonia water to obtain the stabilized concentrated natural latex.
The invention prepares the concentrated natural latex after pretreatment of the fresh latex.
In the invention, the fresh latex preferably further comprises detection grading of the fresh latex before pretreatment to obtain the fresh latex reaching the detection standard; the detection classification preferably adopts SN/T2541-2010, GB/T8292 and GB/T18012 detection standards. The method can obtain the fresh latex reaching the standard by detecting and grading the fresh latex.
In the present invention, the pretreatment preferably includes: fresh latex was filtered and mixed with aqueous ammonia, followed by centrifugation.
The present invention is not particularly limited to the filtration operation, and the impurities in the fresh latex may be removed by filtration operations well known to those skilled in the art.
In the present invention, the amount of ammonia added during the pretreatment is preferably 0.1 to 0.6%, more preferably 0.2 to 0.4%, and still more preferably 0.3% of the mass of the fresh latex. In the present invention, the mass concentration of the aqueous ammonia used in the pretreatment is preferably 15 to 36%, more preferably 23 to 27%. The invention limits the addition amount and mass concentration of ammonia water to the above range, which is beneficial to the preservation of fresh latex.
In the present invention, the centrifugation is preferably performed in a centrifuge. The invention has no special requirements on the rotational speed and time of the centrifugation, and the skim latex in the latex can be separated by adopting the centrifugation operation which is well known to the person skilled in the art.
After the concentrated natural latex is obtained, the concentrated natural latex, the natural latex composite stabilizer and ammonia water are mixed to obtain the stabilized concentrated natural latex.
In the present invention, the mixing of the concentrated natural latex with the natural latex composite stabilizer and ammonia water is preferably performed in a conditioning tank.
In the present invention, the amount of the natural latex composite stabilizer to be added is preferably 0.4 to 2%, more preferably 0.8 to 1.8%, still more preferably 1 to 1.6% by mass of the dry gel in the concentrated natural latex. In the present invention, the natural latex composite stabilizer is used in the form of an aqueous solution; the mass concentration of the natural latex composite stabilizer in the aqueous solution is preferably 5 to 15%, more preferably 10%. The invention limits the addition amount and concentration of the natural latex composite stabilizer to the above range, and can increase the speed of achieving the required mechanical stability of the concentrated natural latex.
In the present invention, the amount of ammonia added is preferably 0.06 to 1% by mass, more preferably 0.1 to 0.8% by mass, still more preferably 0.3 to 0.6% by mass, of the concentrated natural latex. In the present invention, the mass concentration of the aqueous ammonia is preferably 20 to 28%, more preferably 24 to 26%. The invention limits the content and the concentration of the ammonia water to be in the range, so that the latex can be ensured to have good antibacterial performance, and the subsequent latex is ensured not to be denatured in the processing process.
In one embodiment of the present invention, the mixing of the concentrated natural latex with the natural latex composite stabilizer and the aqueous ammonia is preferably mixing the natural latex composite stabilizer and the aqueous ammonia together with the concentrated natural latex.
In another embodiment of the present invention, the mixing of the concentrated natural latex with the natural latex composite stabilizer and ammonia is preferably performed by adding ammonia to the concentrated natural latex prior to adding the natural latex composite stabilizer.
In the present invention, the mixing of the concentrated natural latex with the natural latex composite stabilizer and the aqueous ammonia is preferably performed under stirring; the rotation speed of stirring is preferably 30-200 r/min; the stirring time is preferably 5 to 15 minutes. The invention can ensure that the additive and the latex are fully and uniformly mixed by limiting the mixing rotating speed and time to the above range.
After the mixing is completed, the mixed product is preferably subjected to sequential accumulation, precipitation and aging to obtain the stabilized concentrated natural latex.
The invention is not particularly limited in the operation of accumulation, and the product obtained after mixing is accumulated to a certain amount which can be conveniently adjusted by adopting the operation known to the person skilled in the art.
The operation of the precipitation is not particularly limited, and the impurities in the concentrated latex can be precipitated as a precipitate by an operation commonly used by those skilled in the art.
The aging operation is not particularly limited in the present invention, and may be performed by aging operations well known to those skilled in the art. According to the invention, the natural latex composite stabilizer, ammonia water and the surfaces of rubber particles in the latex can fully react through aging, so that negative charges of the stabilized rubber particles are gradually increased, repulsive force among the rubber particles is increased, and the latex is more stable.
In the present invention, the dry gel content in the stabilized concentrated natural latex is preferably 60 to 62%. The dry rubber content in the stabilized concentrated natural latex is limited to be within the range, so that the factory requirements of the stabilized concentrated natural latex can be met.
The technical solutions of the present invention will be clearly and completely described in the following in connection with the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The invention provides a natural latex composite stabilizer, which comprises the following components in percentage by weight: 10% of ammonium oleate, 65% of potassium linoleate, 15% of ammonium stearate and 10% of ammonium palmitate.
A method for rapidly improving mechanical stability of concentrated natural latex, which uses the natural latex composite stabilizer, comprises the following steps:
(1) Filtering the collected qualified fresh latex, adding ammonia water with the mass concentration of 25% and the mass concentration of 0.1-0.6% of the fresh latex, preserving, uniformly stirring, clarifying, removing sediment, centrifuging by adopting a high-speed rotary centrifuge, and separating out the skim latex to obtain concentrated natural latex;
(2) Transferring the concentrated natural latex obtained in the step (1) to a regulating tank, immediately adding a natural latex composite stabilizer with the mass percent of 0.4% and ammonia water with the mass percent of 0.6% into the concentrated natural latex, stirring the mixture until a stabilizing system is fully and uniformly stirred, regulating the dry rubber content to 60%, and finally accumulating, precipitating and aging to obtain the stabilized concentrated natural latex.
The Mechanical Stability (MST) of the stabilized concentrated natural latex prepared in example 1 was measured for the time required to meet the national standards, volatile fatty acid Value (VFA) and the mechanical stability of the stabilized concentrated latex after 3 months of aging, and the test results are shown in Table 1.
Example 2
Example 2 differs from example 1 only in that the natural latex composite stabilizer was added in an amount of 0.8%, otherwise the same as example 1.
The Mechanical Stability (MST) of the stabilized concentrated natural latex prepared in example 2 was measured for the time required to meet the national standard, volatile fatty acid Value (VFA) and the mechanical stability of the stabilized concentrated latex after 3 months of aging, and the test results are shown in Table 1.
Example 3
Example 3 differs from example 1 only in that the amount of the natural latex composite stabilizer added is 1.6%, otherwise the same as example 1.
The Mechanical Stability (MST) of the stabilized concentrated natural latex prepared in example 3 was measured for the time required to meet the national standard, volatile fatty acid Value (VFA) and the mechanical stability of the stabilized concentrated latex after 3 months of aging, and the test results are shown in Table 1.
Example 4
Example 4 differs from example 2 only in that the amount of ammonia added in the above-mentioned step (2) was 0.1%, and the other steps are the same as those in example 2.
The Mechanical Stability (MST) of the stabilized concentrated natural latex prepared in example 4 was measured for the time required to meet the national standard, volatile fatty acid Value (VFA) and the mechanical stability of the stabilized concentrated latex after 3 months of aging, and the test results are shown in Table 1.
Example 5
Example 5 differs from example 2 only in that the amount of ammonia added in the above-mentioned step (2) was 0.3%, and the other steps are the same as those in example 2.
The Mechanical Stability (MST) of the stabilized concentrated natural latex prepared in example 5 was measured for the time required to meet the national standards, volatile fatty acid Value (VFA) and the mechanical stability of the stabilized concentrated latex after 3 months of aging, and the test results are shown in Table 1.
Comparative example
The comparative example differs from example 1 only in that the natural latex composite stabilizer was replaced with an aqueous solution of 10% strength ammonium laurate having a dry gel content of 0.08% in concentrated natural latex, otherwise as in example 1.
The Mechanical Stability (MST) of the stabilized concentrated natural latex prepared in the comparative example was measured for the time required to meet the national standard, the volatile fatty acid Value (VFA) and the mechanical stability of the stabilized concentrated latex after 3 months of aging, and the test results are shown in Table 1.
Test examples 1 to 5 and comparative test example
Adding 0.1 part of 20% potassium hydroxide solution, 0.1 part of 20% peregal 'O' solution (polyoxyethylene fatty alcohol ether), 1.0 part of 50% sulfur dispersion, 0.5 part of 50% ZDC dispersion, 0.4 part of 40% zinc oxide dispersion and deionized water into 100 parts of stabilized concentrated natural latex obtained in examples 1-5 and comparative example respectively, stirring while adding, and pre-vulcanizing at a constant temperature of 60 ℃ until the chloroform value is 'three times two and three times one' after the two times, rapidly taking out the latex, cooling to room temperature, filtering with 100 meshes, ageing the filtered pre-vulcanized latex for 48 hours, filtering with 200 meshes again, defoaming, slowly injecting the filtered latex into a horizontally placed glass plate, standing for 1min, uniformly scraping off redundant latex by using a clean ruler across a mold frame, putting on a frame, covering a cloth cover, and forming a film and drying the latex sample on the glass plate (refer to GB/T18011: room temperature is more than 16 hours, drying at 35 ℃ and surface temperature is more than 35 ℃ for 24 hours), thus obtaining vulcanized film; the deionized water is added in an amount such that the dry rubber content of the natural rubber in the formulated pre-vulcanized latex is 50%.
And testing the tensile strength, tearing strength, elongation at break and gas permeability of the prepared vulcanized adhesive film.
The content of the concentrated latex dry glue is determined according to the test standard of GB/T8299;
the measurement of tensile strength, tensile stress and elongation at break is according to the test standard GB/T528;
the tear strength was determined according to the test standard GB/T529;
the hot air aging test is determined according to the test standard GB/T3512;
the latex mechanical stability was determined according to the test standard GB/T8301;
the determination of the volatile fatty acid number in the latex was in accordance with the test standard GB/T8292;
the film was tested for gas permeability according to the test standard GB/T1038.
The performance test data of the stabilized concentrated natural rubber latex prepared in examples 1 to 5 and comparative example are shown in table 1:
TABLE 1 Performance test data for stabilized concentrated Natural latex prepared in examples 1-5 and comparative example
The performance test data for the unaged vulcanized films prepared from stabilized concentrated natural rubber latex of examples 1 to 5 and comparative example are shown in Table 2:
TABLE 2 Performance test data for the unaged vulcanized films prepared from the stabilized concentrated natural rubber latex obtained in examples 1 to 5 and comparative example
The performance test data after aging of the vulcanized films prepared from the stabilized concentrated natural rubber latex of examples 1 to 5 and comparative example are shown in table 3:
TABLE 3 Performance test data after aging of vulcanized films prepared from stabilized concentrated natural rubber latex obtained in examples 1 to 5 and comparative example
| Test item | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Comparative example |
| Tensile strength, MPa | 20.2 | 21.1 | 21.3 | 20.6 | 20.9 | 17.6 |
| 500% stress at definite elongation, MPa | 2.65 | 2.71 | 2.75 | 2.64 | 2.73 | 2.30 |
| Elongation at break% | 1015 | 1123 | 1212 | 1032 | 1206 | 1004 |
As apparent from the properties of the stabilized concentrated natural rubber latex prepared in examples 1 to 5 in Table 1, the Mechanical Stability (MST) of the stabilized concentrated natural rubber latex obtained by the method can meet the national standard regulation (MST is more than or equal to 650 s) within 10 days, and the stabilized concentrated natural rubber latex still has good mechanical stability after aging for 3 months, which indicates that the method provided by the invention can rapidly improve the mechanical stability of the stabilized concentrated natural rubber latex.
As apparent from the properties of the vulcanized films prepared from the stabilized concentrated natural rubber latex obtained in examples 1 to 5 in Table 2 when not aged, the vulcanized films prepared from the stabilized concentrated natural rubber latex obtained by the method of the present invention have a tensile strength of 29.3 to 30.1MPa, a 500% elongation stress of 2.81 to 3.12MPa, an elongation at break of 970 to 1065% and a gas permeability of 1.6 to 2.0cm when not aged 3 /cm 2 s.Pa.cm, the tensile strength is improved by more than 10%, the elongation at break is improved by more than 12.7%, the gas permeability is reduced by more than 13%, and the use performance is good.
As is evident from the properties of the vulcanized films prepared from the stabilized concentrated natural rubber latex obtained in examples 1 to 5 in Table 3 after aging, the vulcanized films prepared from the stabilized concentrated natural rubber latex obtained by the method of the present invention have tensile strength of 20.2 to 21.3MPa,500% stretching stress of 2.64 to 2.75MPa, elongation at break of 1015 to 1212%, tensile strength of 14.7% or more, elongation at break of 1% or more, and good service performance.
The invention rapidly improves the mechanical stability of the concentrated natural latex by utilizing the long-chain fatty acid contained in the oleic acid soap, the linoleic acid soap, the stearic acid soap and the auxiliary fatty acid soap in the natural latex composite stabilizer, achieves the comprehensive effect which is not possessed by single fatty acid by utilizing the combined action of a plurality of long-chain fatty acids, and simultaneously avoids the adverse effect on the processing operability of the concentrated natural latex. The results of the examples show that the Mechanical Stability (MST) of the stabilized concentrated natural latex treated by the natural latex composite stabilizer provided by the invention can meet the national standard regulation (MST is more than or equal to 650 s) within 10 days, the tensile strength of the vulcanized rubber film of the stabilized concentrated natural latex product is 29.3-30.1 MPa, the 500% stretching stress is 2.81-3.12 MPa, the elongation at break is 970-1065%, and the gas permeability is 1.6-2.0 cm when the vulcanized rubber film is not aged 3 /cm 2 s.Pa.cm, the tensile strength is improved by 10% or more, the elongation at break is improved by 12.7% or more, and the gas permeability is reduced by 13% or more, so that the mechanical stability of the stabilized concentrated natural latex can be rapidly improved and the adverse effect on the processing operability of the stabilized concentrated natural latex can be avoided.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (10)
1. A natural latex composite stabilizer comprises oleic acid soap, linoleic acid soap, stearic acid soap and auxiliary fatty acid soap.
2. The natural latex composite stabilizer as set forth in claim 1, wherein: the natural latex composite stabilizer comprises the following components in percentage by weight: 10 to 40 percent of oleic acid soap, 35 to 65 percent of linoleic acid soap, 15 to 35 percent of stearic acid soap and 10 to 25 percent of auxiliary fatty acid soap.
3. The natural latex composite stabilizer as set forth in claim 2, wherein: the auxiliary fatty acid soap is one or more of water-soluble fatty acid ammonium, water-soluble fatty acid potassium, water-soluble fatty acid sodium and water-soluble fatty acid lithium.
4. The natural latex composite stabilizer as set forth in claim 2, wherein: the fatty acid in the auxiliary fatty acid soap is one or more of myristic acid, palmitic acid, linolenic acid, arachidic acid and furanic acid.
5. A method for rapidly improving the mechanical stability of concentrated natural latex using the natural latex composite stabilizer of any one of claims 1 to 4, comprising the steps of:
(1) Pretreating fresh latex to obtain concentrated natural latex;
(2) And (3) mixing the concentrated natural latex obtained in the step (1) with a natural latex composite stabilizer and ammonia water to obtain the stabilized concentrated natural latex.
6. The method according to claim 5, wherein: the pretreatment in the step (1) comprises: fresh latex was filtered and mixed with aqueous ammonia, followed by centrifugation.
7. The method according to claim 6, wherein: the addition amount of the ammonia water is 0.1-0.6% of the mass of the fresh latex.
8. The method according to claim 5, wherein: the addition amount of the natural latex composite stabilizer in the step (2) is 0.4-2% of the mass of the dry rubber in the concentrated natural latex.
9. The method according to claim 5, wherein: the natural latex composite stabilizer is used in the form of an aqueous solution; the mass concentration of the natural latex composite stabilizer in the aqueous solution is 5-15%.
10. The method according to claim 5, wherein: the addition amount of the ammonia water in the step (2) is 0.06-1% of the mass of the concentrated natural latex.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB413185A (en) * | 1933-02-23 | 1934-07-12 | Naugatuck Chem Co | Improvements in or relating to the treatment of rubber latex |
| GB425751A (en) * | 1933-10-20 | 1935-03-20 | Int Latex Processes Ltd | Improvements in or relating to a process for stabilising creamed latex and product obtained thereby |
| GB708056A (en) * | 1950-07-19 | 1954-04-28 | Dunlop Rubber Co | Method of improving the stability of rubber latex |
| JP2000272022A (en) * | 1999-03-25 | 2000-10-03 | Sumitomo Rubber Ind Ltd | Sealing agent for tire puncture |
| EP1095949A1 (en) * | 1999-10-28 | 2001-05-02 | Sumitomo Rubber Industries, Ltd. | Deproteinized natural rubber latex |
| CN111040051A (en) * | 2019-12-13 | 2020-04-21 | 中国热带农业科学院农产品加工研究所 | Natural latex stabilizer and application thereof |
| CN112010996A (en) * | 2020-09-14 | 2020-12-01 | 中国热带农业科学院南亚热带作物研究所 | Preparation method of low-protein natural latex |
-
2023
- 2023-09-14 CN CN202311185735.1A patent/CN117088999A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB413185A (en) * | 1933-02-23 | 1934-07-12 | Naugatuck Chem Co | Improvements in or relating to the treatment of rubber latex |
| GB425751A (en) * | 1933-10-20 | 1935-03-20 | Int Latex Processes Ltd | Improvements in or relating to a process for stabilising creamed latex and product obtained thereby |
| GB708056A (en) * | 1950-07-19 | 1954-04-28 | Dunlop Rubber Co | Method of improving the stability of rubber latex |
| JP2000272022A (en) * | 1999-03-25 | 2000-10-03 | Sumitomo Rubber Ind Ltd | Sealing agent for tire puncture |
| EP1095949A1 (en) * | 1999-10-28 | 2001-05-02 | Sumitomo Rubber Industries, Ltd. | Deproteinized natural rubber latex |
| CN111040051A (en) * | 2019-12-13 | 2020-04-21 | 中国热带农业科学院农产品加工研究所 | Natural latex stabilizer and application thereof |
| CN112010996A (en) * | 2020-09-14 | 2020-12-01 | 中国热带农业科学院南亚热带作物研究所 | Preparation method of low-protein natural latex |
Non-Patent Citations (1)
| Title |
|---|
| D.C.BLACKLEY，阮烽: "十八碳羧酸钾皂对天然胶乳机械稳定性和热敏性的影响", 《热带作物译丛》, 29 August 1981 (1981-08-29), pages 25 - 34 * |
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