CN113773415A - Method for improving quality consistency of whole latex - Google Patents
Method for improving quality consistency of whole latex Download PDFInfo
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- CN113773415A CN113773415A CN202111084311.7A CN202111084311A CN113773415A CN 113773415 A CN113773415 A CN 113773415A CN 202111084311 A CN202111084311 A CN 202111084311A CN 113773415 A CN113773415 A CN 113773415A
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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
- C08C1/02—Chemical or physical treatment of rubber latex before or during concentration
- C08C1/075—Concentrating
- C08C1/12—Concentrating by evaporation
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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 invention provides a method for improving the quality consistency of whole latex, which comprises the steps of preserving fresh latex by compounding peroxide, soluble phosphate and bactericide, curing the fresh latex for 1-10 days, removing bottom sediment after the curing of the latex is finished, slowly adding formic acid solution with mass concentration less than or equal to 3% into the latex without sediments while stirring the latex, uniformly mixing the latex and the formic acid solution, standing for more than 18h, pressing gel blocks into a film with the thickness of 2-7 mm, soaking the film for 1-3 d with flowing clear water, repeatedly washing the film for 1-5 times with clear water to remove residual acid and non-rubber substances on the surface of the film, dripping the washed film for 1-4 h, drying at low temperature (less than or equal to 80 ℃), the prepared full latex has high plasticity retention rate, the fluctuation of the plasticity initial value, the Mooney viscosity and the like of the raw rubber is less than or equal to +/-5 in the storage process, and the quality consistency is better; the method also has the advantages of simple process, easy operation, low production cost, easy large-scale production and the like.
Description
Technical Field
The invention relates to the technical field of rubber, in particular to a method for improving the quality consistency of whole latex.
Background
Natural Rubber (NR) is a natural polymer compound containing cis-1, 4-polyisoprene as a main component, 91-94% of which is rubber hydrocarbon (cis-1, 4-polyisoprene), and the balance of which is non-rubber substances such as protein, lipid, inorganic salt and the like. The natural rubber is generally referred to as an elastic material obtained by collecting natural latex from Brazilian rubber trees and subjecting the natural latex to coagulation, press-creping, granulation, drying and the like. The whole latex is prepared by mixing fresh latex and coagulating with formic acid or acetic acid as coagulant under controlled condition, and the prepared rubber has no specified viscosity or color.
The natural rubber contains about 5 percent of non-rubber components, and the non-rubber components participate in the cross-linking among rubber molecular chains in the storage process, so that the cross-linking reaction among the molecular chains is continuously carried out, and the quality fluctuation of the natural rubber is large.
Because the domestic natural rubber has large quality fluctuation and poor consistency in the storage process, the production process and the product qualification rate of product enterprises are seriously influenced and are always suffered from the problems of product departments; in addition, the high-end product has high performance requirements on natural rubber raw materials, the quality consistency of domestic natural rubber is poor, and the rubber using requirements of the high-end product are difficult to meet, so that rubber for the high-end product in China depends on import for a long time, and the safe supply of national strategic materials is seriously influenced. Improving the quality consistency of domestic natural rubber is one of the problems to be solved urgently in the rubber processing field.
Disclosure of Invention
Therefore, the invention provides a method for improving the quality consistency of the whole latex, and the method has the advantages of simple process, easy operation, low production cost, easy large-scale production and the like.
The technical scheme of the invention is realized as follows:
a method of improving the quality consistency of whole latex comprising the steps of:
s1, adding a composite preservation system into fresh latex, uniformly mixing the latex with the composite preservation system, curing the latex for 1-10 days, removing bottom sediment, adding a coagulant accounting for 0.3-1% of the mass of the fresh latex while stirring the latex, uniformly mixing, standing, and curing for more than 18 hours after the latex is completely cured to obtain gel blocks; the composite preservation system comprises peroxide, soluble phosphate and NH3(Ammonia) and BCT-2 (isothiazole)
A quinolinone);
s2, taking the gel block obtained in the step S1 for pressing and crazing to obtain a crape sheet with the thickness of 2-7 mm, and washing the crape sheet to obtain a film;
and S3, drying the film obtained in the step S2 by adopting hot air, and preparing full latex when the film is not half-cooked.
Preferably, the fresh latex is 20-25% of dry rubber mass concentration.
Preferably, the curing time is 2-7 d.
Preferably, the dosage of the compound preservation system is 0.01-1% of the fresh milk colloid.
Preferably, the peroxide is hydrogen peroxide, potassium peroxide and/or calcium peroxide.
Preferably, the soluble phosphate is diammonium phosphate, trisodium phosphate and/or dipotassium phosphate.
Preferably, the composite preservation system also comprises HY (s-triazine derivative) and ClO2(chlorine dioxide), HB (bromopinylpropanediol) and/or isothiazolinone derivatives.
Preferably, the hydrogen peroxide, the diammonium hydrogen phosphate and the NH in the compound preservation system3And BCT-2 in a mass ratio of (0.05-0.2): (0.05-0.1): (0.3-0.5): (0.05-0.15), the curing time of the fresh latex can be prolonged, the cross-linking between rubber molecular chains can be promoted, the hardening phenomenon in the storage process can be weakened, the anti-oxidation and anti-aging performance of the raw rubber can be improved, and the raw rubber can be further processed by compounding a plurality of substancesHigh quality consistency of the whole latex.
Preferably, the coagulant is 2-3 wt% formic acid solution and/or acetic acid.
Preferably, the thickness of the crepe is 3-4 mm.
Preferably, the washing is to soak the rubber sheet for 1-3 d with flowing clear water, then take out the rubber sheet, and drip water for 2-3 h.
Preferably, the hot air drying temperature is 60-80 ℃.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a method for improving the quality consistency of whole latex, which uses peroxide, soluble phosphate and NH3Fresh latex is stored by compounding with BCT-2, the curing time of the latex is prolonged, the cross-linking between rubber molecular chains is promoted, sediment at the bottom layer of the latex is removed before the latex is solidified, then the latex is solidified by adopting a coagulant, the latex is cured for more than 18 hours after the latex is completely solidified, then the coagulum is pressed and crazed into a rubber sheet, the rubber sheet is washed, the acid and non-rubber substances remained on the surface of the rubber sheet are removed, and the full latex with better quality consistency is prepared by drying; the method also has the advantages of simple process, easy operation, low production cost, easy large-scale production and the like.
The invention adopts the use of hydrogen peroxide, diammonium hydrogen phosphate and NH3The latex is compounded with BCT-2 to preserve the fresh latex, the mechanical stability of the latex is improved by hydrogen peroxide, and diammonium hydrogen phosphate can be mixed with metal ions (Ca) in the latex++、 Mg++) The chemical reaction is carried out to generate insoluble phosphate precipitation, thereby eliminating the free aging performance; the low-concentration formic acid solution coagulates the latex, avoids incomplete coagulation or local coagulation and separation, avoids destabilization of calcium and magnesium ions on the latex, can improve the oxygen resistance of the crude rubber, and reduces the influence of formic acid on the performance of the rubber; then, the rubber sheet is soaked in flowing clear water to remove acid and non-rubber substances remained on the surface of the rubber, so that the influence of the acid and the non-rubber substances on the performance of the full latex is reduced, and finally, the full latex with better quality consistency is obtained through low-temperature hot air drying.
The curing time of the invention is 1-10 days, preferably 2-up to7d, curing time is too short or too long, and the initial plastic value (P) of the prepared raw rubber in the storage process0) Mooney viscosity and the like are greatly fluctuated, and the consistency is poor.
Detailed Description
In order to better understand the technical content of the present invention, a specific embodiment is provided below to further explain the present invention.
Example 1
A method of improving the quality consistency of whole latex comprising the steps of:
s1, adding a composite storage system with the mass of 0.47% of the fresh latex into the fresh latex, uniformly mixing, curing for 1d, removing sediments at the bottom layer of the latex, slowly adding a 3 wt% formic acid solution with the mass of 0.3% of the fresh latex while stirring, standing and solidifying after the latex and the acid solution are completely mixed, standing and curing for 18h after the latex is completely solidified, and obtaining a gel block; the composite preservation system comprises 0.05 percent of hydrogen peroxide, 0.07 percent of HY, 0.05 percent of HB and NH in terms of fresh latex amount3The addition amount of (A) is 0.3%;
s2, pressing the coagulum obtained in the step S1 into a crepe with the thickness of 4mm, soaking the crepe 1d in flowing clear water, taking out the crepe for dripping for 2h, and repeatedly washing the crepe for 3 times to obtain a film;
and S3, drying the film obtained in the step S2 by adopting hot air at 60 ℃ until the film has no half-cooked point, and obtaining the hololatex.
Example 2
A method of improving the quality consistency of whole latex comprising the steps of:
s1, adding a composite storage system with the mass of 0.71 percent of that of the fresh latex into the fresh latex, uniformly mixing, curing for 7 days, removing sediments at the bottom layer of the latex, slowly adding a 3wt percent formic acid solution with the mass of 0.3 percent of that of the fresh latex while stirring, standing and solidifying after the latex and the acid solution are completely mixed, standing and curing for 20 hours after the latex is completely solidified, and obtaining gel blocks; the composite preservation system comprises 0.1 percent of hydrogen peroxide, 0.05 percent of diammonium hydrogen phosphate, 0.1 percent of HY and CLO (sodium chloride, ammonium chloride and ammonium hydroxide) in terms of fresh latex amount2Is 0.05%, HB is 0.01%, NH3The addition amount of (A) is 0.4%;
s2, pressing the coagulum obtained in the step S1 into a crepe of 3.5mm, soaking the crepe 2d in flowing clear water, taking out the crepe for dripping for 2h, and repeatedly washing the crepe for 3 times to obtain a film;
and S3, drying the film obtained in the step S2 by adopting hot air at 65 ℃ until the film has no half-cooked point to obtain full latex.
Example 3
A method of improving the quality consistency of whole latex comprising the steps of:
s1, adding a composite storage system with the mass of 0.4% of the fresh latex into the fresh latex, uniformly mixing, curing for 5d, removing sediments at the bottom layer of the latex, slowly adding a formic acid solution with the mass of 2.5% of the fresh latex while stirring, standing and solidifying after the latex and the acid solution are completely mixed, standing and curing for 18h after the latex is completely solidified, and obtaining a gel block; the composite preservation system comprises 0.1 percent of hydrogen peroxide, 0.05 percent of diammonium hydrogen phosphate and NH (ammonium hydroxide) in terms of fresh latex amount3The addition amount of (A) is 0.1%, and the addition amount of BCT-2 is 0.15%;
s2, pressing the coagulum obtained in the step S1 into a crepe with the thickness of 3mm, soaking the crepe 2d in flowing clear water, taking out the film, dripping water for 2h, and repeatedly washing the crepe for 3 times to obtain a film;
and S3, drying the film obtained in the step S2 by adopting hot air at the temperature of 80 ℃ until the film has no half-cooked point, and obtaining the hololatex.
Example 4
A method of improving the quality consistency of whole latex comprising the steps of:
s1, adding a composite storage system with the mass of 0.5% of the fresh latex into the fresh latex, uniformly mixing, curing for 5d, removing sediments at the bottom layer of the latex, slowly adding a 2 wt% formic acid solution with the mass of 1% of the fresh latex while stirring, standing and solidifying after the latex and the acid solution are completely mixed, standing and curing for 18h after the latex is completely solidified, and obtaining a gel block; the composite preservation system comprises 0.05 percent of hydrogen peroxide, 0.08 percent of diammonium hydrogen phosphate and NH (ammonium hydroxide) in terms of fresh latex amount3The addition amount of the BCT-2 is 0.3 percent, the addition amount of the BCT-2 is 0.08 percent, and the addition amount of the HY is 0.05 percent;
s2, pressing the coagulum obtained in the step S1 into a crepe with the thickness of 3mm, soaking the crepe 3d in flowing clear water, taking out the crepe, dripping water for 2.5h, and repeatedly washing the crepe for 3 times to obtain a film;
and S3, drying the film obtained in the step S2 by adopting hot air at 75 ℃ until the film has no half-cooked point, and obtaining the hololatex.
Example 5
A method of improving the quality consistency of whole latex comprising the steps of:
s1, adding a composite storage system with the mass of 0.55% of the fresh latex into the fresh latex, uniformly mixing, curing for 4d, removing sediments at the bottom layer of the latex, slowly adding a formic acid solution with the mass of 2.5% of the fresh latex while stirring, standing and solidifying after the latex and the acid solution are completely mixed, standing and curing for 18h after the latex is completely solidified, and obtaining a gel block; the composite preservation system comprises 0.05 percent of hydrogen peroxide, 0.05 percent of diammonium hydrogen phosphate and NH (ammonium hydroxide) in terms of fresh latex amount3The addition amount of (A) is 0.3%, the addition amount of BCT-2 is 0.1%, and the addition amount of HB is 0.05%;
s2, pressing the coagulum obtained in the step S1 into a crepe with the thickness of 4mm, soaking the crepe 2d in flowing clear water, taking out the crepe for dripping for 2h, and repeatedly washing the crepe for 3 times to obtain a film;
and S3, drying the film obtained in the step S2 by adopting hot air at 75 ℃ until the film has no half-cooked point, and obtaining the hololatex.
Example 6 Total Lactoferrin amount consistency Performance test
Detecting items: initial value of plasticity (P)0) Plastic retention rate (PRI) and Mooney viscosity (Mv);
the detection method comprises the following steps: after the preparation of the whole latex and after the conventional storage for 6 months, the plastic initial value, the plastic retention rate and the Mooney viscosity of the raw latex are detected, and the detection results are shown in Table 1; wherein the detection of the initial value of the plasticity is carried out according to the GB/T3510-2006 standard, the detection of the plasticity retention rate is carried out according to the GB/T3517-2014 standard, and the detection of the Mooney viscosity is carried out according to the GB/T1232.1-2016 standard;
TABLE 1
The results show that the whole latex prepared in example 4 has the best resistance to oxidative aging, the minimal fluctuation of initial plasticity, Mooney viscosity and the like during natural storage, and the best quality consistency.
Example 7 physical mechanical Property measurements
Detecting the tensile strength and the tearing strength of the vulcanized rubber sample according to GB/T528-;
TABLE 2
| Tensile Strength (MPa) | Tear Strength (kN/m) | |
| Example 1 | 18.2 | 25.3 |
| Example 2 | 18.5 | 25.1 |
| Example 3 | 20.2 | 27.0 |
| Example 4 | 23.8 | 29.4 |
| Example 5 | 21.7 | 27.5 |
The results show that the full emulsions prepared in examples 3-5 of the present invention have excellent tensile strength and tear properties after vulcanization, with the highest tensile strength and tear strength of the vulcanizate of example 4.
The above description is only exemplary of the present invention, and is not intended to limit the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for improving the quality consistency of whole latex, which is characterized by comprising the following steps:
s1, adding a composite preservation system into fresh latex, uniformly mixing the latex with the composite preservation system, curing the latex for 1-10 days, removing bottom sediment, adding a coagulant accounting for 0.3-1% of the mass of the fresh latex while stirring the latex, uniformly mixing, standing, and curing for more than 18 hours after the latex is completely cured to obtain gel blocks; the composite preservation system comprises peroxide, soluble phosphate and NH3And BCT-2; the using amount of the composite preservation system is 0.01-1% of the mass of the fresh latex;
s2, taking the gel block obtained in the step S1 for pressing and crazing to obtain a crape sheet with the thickness of 2-7 mm, and washing the crape sheet to obtain a film;
and S3, drying the film obtained in the step S2 by adopting hot air, and preparing full latex when the film is not half-cooked.
2. The method for improving the quality consistency of the whole latex according to claim 1, wherein the field latex is field latex with the mass concentration of dry glue of 20-25%.
3. The method for improving the quality consistency of whole latex according to claim 1, wherein the aging time is 2 to 7 days.
4. The method of improving the quality consistency of whole latex according to claim 1, wherein the peroxide is hydrogen peroxide, potassium peroxide and/or calcium peroxide.
5. The method of improving the quality consistency of whole latex according to claim 1, wherein the soluble phosphate is diammonium phosphate, trisodium phosphate and/or dipotassium phosphate.
6. The method of claim 1, wherein the composite storage system further comprises HY and ClO2HB and/or isothiazolinone derivatives.
7. The method for improving the quality consistency of the whole latex according to any one of claims 4 to 6, wherein the composite preservation system comprises the following components in a mass ratio of (0.05-0.2): (0.05-0.1): (0.3-0.5): (0.05-0.15) hydrogen peroxide, diammonium hydrogen phosphate, NH3And BCT-2.
8. The method for improving the quality consistency of whole latex according to claim 1, wherein the coagulant is 2-3 wt% formic acid solution and/or acetic acid.
9. The method for improving the quality consistency of the whole latex according to claim 1, wherein the washing is to soak the crepe for 1-3 days with flowing clear water, and then to take out the crepe and drip for 2-3 h.
10. The method for improving the quality consistency of the whole latex according to claim 1, wherein the temperature of the hot air drying is 60-80 ℃.
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| CN114773694A (en) * | 2022-04-21 | 2022-07-22 | 西双版纳曼列橡胶有限公司 | Preparation method of TSR9710 modified rubber |
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