CN110372812A - A kind of natural rubber and preparation method thereof with high PO, PRI - Google Patents
A kind of natural rubber and preparation method thereof with high PO, PRI Download PDFInfo
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- CN110372812A CN110372812A CN201910692093.1A CN201910692093A CN110372812A CN 110372812 A CN110372812 A CN 110372812A CN 201910692093 A CN201910692093 A CN 201910692093A CN 110372812 A CN110372812 A CN 110372812A
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- 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
- C08C1/06—Preservation of rubber latex
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08C—TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
- C08C1/00—Treatment of rubber latex
- C08C1/14—Coagulation
- C08C1/15—Coagulation characterised by the coagulants used
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Abstract
The present invention relates to a kind of natural rubber and preparation method thereof with high PO, PRI, belongs to natural rubber production technical field.Above-mentioned natural rubber is prepared from the following materials: natural rubber, bio-preservative, resistance to hot oxidant and biological curing agent.The application prepares natural rubber using wet process mixing, obtain the natural rubber with high PO, PRI, the mass parameter of natural rubber PO, PRI are improved by being directly added into antistaling agent, biomass active agent and curing agent etc. in Heveatex, to make the technical standard of natural rubber catch up with and surpass world level, this method simple process, condition is easy to control, and can optimize the processing process of high-property natural rubber.
Description
Technical field
The present invention relates to natural rubber production technical fields, and in particular to a kind of natural rubber with high PO, PRI and
Preparation method.
Background technique
Natural rubber is important strategic resource and basic industries raw material, direct relation national economy and national security.I
State's import natural rubber amount is very big, the reason is that import is high-quality.China possesses the natural rubbers growing area such as Hainan, Yunnan,
Because domestic natural rubber quality stability is low, especially heatproof oxidation performance can (PO, PRI), the problem of Mooney viscosity.New rubber tapping is led
The Heveatex particle structure and ingredient for causing rubber tree synthesis are made a variation, and make natural rubber quality with being changed,
Some physical and chemical indexs change therewith.Therefore, on the basis of increasing natural rubber output capacity, the quality of natural rubber is improved
And quality stability, the heatproof oxidation performance of especially raising natural rubber can be that one of China's Natural Rubber Industry Development compels
The problem of eyebrows and eyelashes.Local physical chemical change can occur for the group in non-rubber component and rubber molecular chain, send out rubber molecular chain
Raw branching or crosslinking, cause Mooney viscosity of rubber, plasticity initial value, plasticity retention percentage to change, and thermo-labile oxidative phenomena is serious,
Also leading to caouttchouc, there are batch quality differences, this not only increases the difficulty for process of plasticating in rubber product production, increases life
Production capacity consumption, and it is unfavorable for the stabilization of process recipe and product properties.
Summary of the invention
To solve problems of the prior art, the present invention provides a kind of natural rubber and its system with high PO, PRI
Preparation Method solves the problems, such as that Local physical chemical change can occur for the group on non-rubber component and rubber molecular chain, is had
There are the natural rubber of high PO, PRI.
In order to solve the above technical problems, the invention provides the following technical scheme:
On the one hand, the present invention provides a kind of natural rubber with high PO, PRI, is prepared from the following materials: natural rubber
Glue, bio-preservative, resistance to hot oxidant and biological curing agent.
Further, the natural rubber cream is the woodland latex that dry rubber content is 20wt%-36wt%；
10% aqueous solution of the natural rubber cream bio-preservative accounts for the 5-10% of natural rubber cream quality of the emulsion；
The heat-resisting oxidizer is the 5-15% of natural gum dry mass；
Further, 10% solution of the biological curing agent, dosage are the 20% of natural gum quality of the emulsion.
Further, the bio-preservative is made of following parts by weight of component: nano-titanium dioxide 3.0-5.0 weight
Part, ethylparaben 5.0-8.0 parts by weight, chitosan 38.0-45.0 parts by weight, lysozyme 45.0-55.0 parts by weight, weighting Asia
Sodium sulphate 3.0-5.0 parts by weight.
Further, the resistance to hot oxidant is made of following parts by weight of component: 1000 parts by weight of biomass active agent,
Compatilizer 2-3 parts by weight.
Further, the biological curing agent is made of following parts by weight of component: extracting solution 55-80 parts by weight, hydrogen sulfate
Sodium 5.0-7.5 parts by weight, palmitinic acid 10.0-15.0 parts by weight.
Preferably, the extracting solution is one of sorb, large-fruited Chinese hawthorn and bryony extracting solution or a variety of mixed liquors.
On the other hand, the present invention also provides a kind of preparation methods of natural rubber with high PO, PRI, comprising:
Step 1: the preparation of bio-preservative: weighing nano-titanium dioxide 3.0-5.0 parts by weight, ethylparaben in proportion
5.0-8.0 parts by weight, chitosan 38.0-45.0 parts by weight, lysozyme 45.0-55.0 parts by weight, Sodium Metabisulfite 3.0-5.0
Parts by weight are obtained after antistaling agent is directly added or diluted after mixing and are added in Heveatex, stir evenly, obtain latex mixed liquor；
Step 2: the preparation of resistance to hot oxidant: weighing the biomass active agent of 1000 parts by weight in proportion, and compatilizer accounts for life
Species activity agent 2-3 ‰ is in high-speed grinder, grinding rate 500-800r/min, time 10-20min, and ground and mixed is made,
It parks until 2-3h do not settle, surveys settling volume；It adds it in the latex mixed liquor in step 1, is uniformly mixed；
Step 3: the preparation of biological curing agent weighs extracting solution (sorb, large-fruited Chinese hawthorn, bryony) 55-80 weight in proportion
Part, sodium bisulfate 5.0-7.5 parts by weight, palmitinic acid 10.0-15.0 parts by weight obtain biological curing agent after mixing；The biology is solid
Agent is added in Heveatex after directly adding or dilute, and room temperature mechanical stirring is uniformly dispersed, and latex uniformly flocculates 10-16h,
Obtain solidification sizing material；
Step 4: by the sizing material after solidification successively by creasing, being granulated, dry to obtain natural environmental-protective glue.
Further, in the step 4, drying temperature is 55 DEG C -60 DEG C, drying time 24-36h.
Compared with prior art, the invention has the following advantages:
The present invention prepares natural rubber using wet process mixing, the natural rubber with high PO, PRI is obtained, by natural
The mass parameter that antistaling agent, biomass active agent and curing agent etc. improve natural rubber PO, PRI is directly added into latex, thus
The technical standard of natural rubber is set to catch up with and surpass world level, this method simple process, condition is easy to control, and can optimize high-performance natural
The processing process of rubber.
For the present invention using food-grade organism enzymatic hydrolysis production, nonirritant, without side-effects, nonhazardous is harmless, no
Pollution of ecological environment；The simple production process of the heat-resisting oxygen natural rubber of the present invention, by provide it is metered after sufficiently stirring evenly, mention
High rubber heatproof oxidation performance energy, greatly improves PO, PRI, is greatly enhanced to Mooney viscosity.
Specific embodiment
To keep the technical problem to be solved in the present invention, technical solution and advantage clearer, below in conjunction with specific implementation
Example is described in detail.
In the present invention, used material and reagent no special instructions, it is commercially available.
The present invention provides a kind of natural rubber and preparation method thereof with high PO, PRI, and specific embodiment is as follows.
Embodiment 1
A kind of preparation method of the natural rubber with high PO, PRI, comprising:
Step 1: the preparation of bio-preservative: weighing nano-titanium dioxide 3kg, ethylparaben 5kg, chitosan in proportion
39kg, lysozyme 50kg, Sodium Metabisulfite (sodium pyrosulfite) 3Kg obtain antistaling agent after mixing；
From rubber tapping to time about 4-5 hours of receipts glue, it can shift to an earlier date and be put into antistaling agent, general glue bucket specification in receipts glue bucket
It is 20-25 kilograms, being put into antistaling agent about 100-200g in rubber tapping as needed, (season is different, is shown in Table 1), toward in glue bucket
When being put into latex, be stirred, make antistaling agent sufficiently, uniformly in latex.
Step 2: the preparation of resistance to hot oxidant: weighing biomass active agent in proportion, and water high speed fiberizer is added to grind 8-
12min, is made the ageing-resistant slurries of biomass active agent of 14.3% concentration, and compatilizer accounts for biomass active agent 2-3 ‰ in high speed
In grinder, grinding rate 500-800r/min, time 10-20min, ground and mixed are made, and are parked until 2-3h do not settle,
Settling volume is surveyed, it is spare；
The natural rubber 2968.75Kg for weighing natural rubber cream dry content 32% weighs the heat-resisting of 14.3% concentration of preparation
Biomass active agent is poured into natural rubber cream high speed mechanical stirring 10-20min by oxidizer slurry 349.65Kg；
Step 3: the preparation of biological curing agent weighs extracting solution (sorb, large-fruited Chinese hawthorn, bryony) 55 parts by weight in proportion,
Obtain 10% biological curing agent after 7.5 parts by weight of sodium bisulfate, 10.0 parts by weight of palmitinic acid and water mixing (additive amount is shown in Table 2)；
The agent of natural rubber biological curing is added first in coagulation tank, 10% solidification is added by 50-100 kilograms in latex per ton
Agent aqueous solution injects latex, stirs 3min-5min, full and uniform mixing；The pH value of latex in coagulating basin is measured with pH test paper,
Should be between 5.0-6.0, room temperature mechanical stirring is uniformly dispersed, and latex uniformly flocculates 10-16h；Latex solidifies completely, color cream
White, whey " clearly without turbid, muddy without white ", shape is like milky thumbnail.
Step 4: the grumeleuse that step 3 is obtained be put into it is ironed on machine crape machine, crepe in service sink back and forth clean after transmit
It is ironed creped again to machine crape unit, it then is cut into the particle that size is 3-5mm or so through pelletizer, temperature is 60 DEG C, when
Between for for 24 hours, dry natural environmental-protective glue.
The different rubber tapping season bio-preservative dosages of table 1
The different dry rubber content curing agent additional amounts of table 2 and setting time
Natural rubber prepared in the above embodiments is tested for the property, passes through test data according to GB/T8018-2008,
It the results are shown in Table 3.
Execution standard in test process: GB/T8081-2008 caouttchouc.
Testing instruments:
1, stay in impurity on 45um sieve: corrosion resistant metal master sieves 45um, meets GB/T6005-2008 standard
2, ash content: Muffle furnace
3, nitrogen content nitrogen content: is measured using K9860 type full-automatic Kjeldahl determination device
4, volatile matter: constant temperature blast drying oven
5, the measurement of plasticity initial value (P0), rapid plastometer method Wallace's plastometer
6, the measurement of caouttchouc plasticity retention percentage (PRI)
6, Wallace's plastometer with ageing oven
7, open mill
8, mixer: 1L
9, vulcanizing press
10, crosslink density: vulcanizate crosslink density automatic And Rapid Determination instrument this method is measured the examination of thickness about 0.2mm
Volume change of the piece in swelling process is recorded by optical-electronic conversion, in addition to can use initial value better than national standard _ MV_
A and end of a period value _ MV_b are directly calculated outside the crosslink density characterization value V_r of vulcanizate, can also be carried out by swelling curve molten
Swollen dynamic (dynamical) research changes solvent, the dynamics research that the oil suction of sample can be carried out, inhale other media (soda acid) etc. and its
It acquires its oil suction or inhales dielectric value, can also measure the shrinking percentage etc. of rubber compound extrudate.
Table 3
Embodiment 2
A kind of preparation method of the natural rubber with high PO, PRI, comprising:
Step 1: the preparation of bio-preservative: weighing nano-titanium dioxide 3kg, ethylparaben 5kg, chitosan in proportion
39kg, lysozyme 50kg, Sodium Metabisulfite (sodium pyrosulfite) 3Kg are added 900kg deionized water, are stirred into slurry.
From rubber tapping to time about 4-5 hours of receipts glue, it can shift to an earlier date and be put into antistaling agent, general glue bucket specification in receipts glue bucket
It is 20-25 kilograms, being put into antistaling agent about 100-200g in rubber tapping as needed, (season is different, is shown in Table 1), toward in glue bucket
When being put into latex, be stirred, make antistaling agent sufficiently, uniformly in latex.
Step 2: the preparation of resistance to hot oxidant: weighing biomass active agent in proportion, and water high speed fiberizer is added to grind 8-
12min, is made the ageing-resistant slurries of biomass active agent of 14.3% concentration, and compatilizer accounts for biomass active agent 2-3 ‰ in high speed
In grinder, grinding rate 500-800r/min, time 10-20min, ground and mixed are made, and are parked until 2-3h do not settle,
Settling volume is surveyed, it is spare；
The natural rubber 2812.5Kg of natural rubber cream dry content 32%, the resistance to thermal oxide for weighing 14.3% concentration of preparation are raw
Biomass active agent is poured into natural rubber cream high speed mechanical stirring 10-20min by species activity agent slurry 699.30Kg；
Step 3: the preparation of biological curing agent weighs extracting solution (sorb, large-fruited Chinese hawthorn, bryony) 80 parts by weight in proportion,
5.0 parts by weight of sodium bisulfate, 15.0 parts by weight of palmitinic acid are uniformly mixed and obtain biological curing agent；
The agent of natural rubber biological curing is added first in coagulation tank, latex per ton presses 50-100 kilograms of addition biological curing
Latex is injected in agent, stirs 3min-5min, full and uniform mixing；Room temperature mechanical stirring is uniformly dispersed, and latex uniformly flocculates 10-
16h；Latex solidifies completely, and color is milky white, and whey " clearly without turbid, muddy without white ", shape is like milky thumbnail.
Step 4: the grumeleuse that step 3 is obtained be put into it is ironed on machine crape machine, crepe in service sink back and forth clean after transmit
It is ironed creped again to machine crape unit, it then is cut into the particle that size is 3-5mm or so through pelletizer, temperature is 60 DEG C, when
Between for for 24 hours, dry natural environmental-protective glue.
Natural rubber prepared in the above embodiments is tested for the property, passes through test data according to GB/T8018-2008,
It the results are shown in Table 4.
Table 4
Embodiment 3
The preparation of the resistance to hot oxidant of step 2 is revised as to weigh the natural rubber of natural rubber cream dry content 32%
2656.25Kg weighs the heat-resisting oxidizing biomass activating agent slurry 1048.95Kg of 14.3% concentration of preparation, by biomass active
Natural rubber cream high speed mechanical stirring 10-20min, resolidification are poured into agent.Remaining step is same as Example 1.
Natural rubber prepared in the above embodiments is tested for the property, passes through test data according to GB/T8018-2008,
It the results are shown in Table 5.
Table 5
By above-mentioned table 3-5 it is found that the application preparation natural rubber plasticity initial value PO with higher and plasticity retention percentage,
Its other performance is also above international standard.
In summary, the application prepares natural rubber using wet process mixing, obtains the natural rubber with high PO, PRI,
The quality of natural rubber PO, PRI are improved by being directly added into antistaling agent, biomass active agent and curing agent etc. in Heveatex
Parameter, so that the technical standard of natural rubber be made to catch up with and surpass world level, this method simple process, condition is easy to control, and can be optimized
The processing process of high-property natural rubber.
The above is a preferred embodiment of the present invention, for those skilled in the art, not
Under the premise of being detached from principle of the present invention, making several improvements and retouching also should be regarded as protection scope of the present invention.
Claims (8)
1. a kind of natural rubber with high PO, PRI, which is characterized in that be prepared from the following materials: natural rubber, biology
Antistaling agent, resistance to hot oxidant and biological curing agent.
2. the natural rubber according to claim 1 with high PO, PRI, which is characterized in that the natural rubber cream is dry
Glue content is the woodland latex of 20wt%-36wt%；
10% aqueous solution of the natural rubber cream bio-preservative accounts for the 5-10% of natural rubber cream quality of the emulsion；
The heat-resisting oxidizer is the 5-15% of natural gum dry mass；
Further, 10% solution of the biological curing agent, dosage are the 20% of natural gum quality of the emulsion.
3. the natural rubber according to claim 2 with high PO, PRI, which is characterized in that the bio-preservative by with
Lower parts by weight of component composition: nano-titanium dioxide 3.0-5.0 parts by weight, ethylparaben 5.0-8.0 parts by weight, chitosan
38.0-45.0 parts by weight, lysozyme 45.0-55.0 parts by weight, Sodium Metabisulfite 3.0-5.0 parts by weight.
4. the natural rubber according to claim 2 with high PO, PRI, which is characterized in that the resistance to hot oxidant by with
Lower parts by weight of component composition: 1000 parts by weight of biomass active agent, compatilizer 2-3 parts by weight.
5. the natural rubber according to claim 2 with high PO, PRI, which is characterized in that the biological curing agent by with
Lower parts by weight of component composition: extracting solution 55-80 parts by weight, sodium bisulfate 5.0-7.5 parts by weight, palmitinic acid 10.0-15.0 weight
Part.
6. the natural rubber according to claim 5 with high PO, PRI, which is characterized in that the extracting solution be sorb,
One of large-fruited Chinese hawthorn and bryony extracting solution or a variety of mixed liquors.
7. a kind of preparation method of the natural rubber with high PO, PRI characterized by comprising
Step 1: the preparation of bio-preservative: weighing nano-titanium dioxide 3.0-5.0 parts by weight, ethylparaben 5.0- in proportion
8.0 parts by weight, chitosan 38.0-45.0 parts by weight, lysozyme 45.0-55.0 parts by weight, Sodium Metabisulfite 3.0-5.0 weight
Part, antistaling agent is obtained after mixing, is directly added in Heveatex after addition or dilution, is stirred evenly, obtain latex mixed liquor；
Step 2: the preparation of resistance to hot oxidant: weighing the biomass active agent of 1000 parts by weight in proportion, and compatilizer accounts for biomass
Activating agent 2-3 ‰ is in high-speed grinder, grinding rate 500-800r/min, time 10-20min, and ground and mixed is made, and parks
Until 2-3h is not settled, settling volume is surveyed；It adds it in the latex mixed liquor in step 1, is uniformly mixed；
Step 3: the preparation of biological curing agent weighs extracting solution (sorb, large-fruited Chinese hawthorn, bryony) 55-80 parts by weight, sulphur in proportion
Sour hydrogen sodium 5.0-7.5 parts by weight, palmitinic acid 10.0-15.0 parts by weight obtain biological curing agent after mixing；The biological curing agent is straight
It is added in Heveatex after connecing addition or dilution, room temperature mechanical stirring is uniformly dispersed, and latex uniformly flocculates 10-16h, is coagulated
Solid glue material；
Step 4: by the sizing material after solidification successively by creasing, being granulated, dry to obtain natural environmental-protective glue.
8. the preparation method of the natural rubber according to claim 6 with high PO, PRI, which is characterized in that the step
In 4, drying temperature is 55 DEG C -60 DEG C, drying time 24-36h.
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| CN114989328A (en) * | 2022-06-17 | 2022-09-02 | 青岛中科华瑞纳科技有限公司 | Demulsification composition for natural rubber latex and preparation method and application thereof |
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Application publication date: 20191025 |