CN110577610B - Ultralow-ammonia concentrated natural latex and preparation method thereof - Google Patents
Ultralow-ammonia concentrated natural latex and preparation method thereof Download PDFInfo
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- 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
Abstract
The invention discloses a preparation method of ultralow-ammonia concentrated natural latex, which comprises the following steps: s1, collecting fresh latex, and pretreating; s2, adding ammonia, a sterilizing and fresh-keeping agent and phosphate, adjusting the mass fraction of the ammonia to be 0.15-0.25%, uniformly stirring, clarifying for 8-72 hours, and removing sediments; s3, transferring the clarified latex to a centrifuge for centrifugation, separating out skim latex and concentrated latex, transferring the concentrated latex to an adjusting tank, immediately adding the sterilizing preservative and lauric soap, fully and uniformly stirring, and performing concentrated latex accumulation to obtain concentrated latex; s4, adjusting the dry glue content in the concentrated latex. The preparation method of the ultralow-ammonia concentrated natural latex provided by the invention not only can play a role in sterilization and bacteriostasis for a long time, ensures that the latex properties are more stable, but also can reduce the using amount of ammonia, is non-irritant and environment-friendly, has a small using amount, and saves the cost.
Description
Technical Field
The invention relates to the technical field of natural concentrated latex production, in particular to ultra-low ammonia concentrated natural latex and a preparation method thereof.
Background
Enzymes and bacteria begin to move about immediately after the natural latex is discharged from trees, and the natural latex becomes more active particularly by the action of oxygen and light, so that proteins, sugars, esters and the like in the latex are decomposed to generate organic acids or putrefactive substances, and charges on rubber particles are neutralized to cause coagulation. The presence of the metal salt on the one hand reacts with the protective layer in the latex and on the other hand promotes the activation of enzymes and bacteria, where the effect is greatest with magnesium ions, which also promotes the coagulation of the latex. For these reasons, natural coagulation of the latex occurs usually 6 to 12 hours after tapping. If the latex is coagulated, the resulting rubber is damaged or removed by proteins and their decomposition products, and the aging resistance is also poor. Therefore, when tapping is needed in the rubber garden, a few drops of ammonia are added into the rubber cup for short-term storage, and the ammonia is added into the latex at a collection station, wherein the ammonia is called as a sterilizing and fresh-keeping preservative. The preservative has the functions of killing bacteria in the latex, inhibiting the activity of enzyme, inhibiting the further propagation of bacteria, or increasing the charge of colloidal particles and improving the stability of potential protection latex. However, the product after adding ammonia has two problems: one is the odor problem, the odor of ammonia volatilized from the product is difficult to accept by human bodies or can cause skin allergy, the stimulation and the damage are caused to the health of the human bodies, and the export of the product can be influenced; another problem is that the vulcanization of natural latex is a chemical cross-linking process, and the presence of ammonia can cause harmful side reactions in the process, which makes vulcanization difficult, and has certain limitations on the application of natural latex and the development of modification technology.
With the rapid development of the rubber industry, the traditional ammonia sterilization, preservation and preservation system cannot meet the requirements of modern rubber production, and the development of an efficient and economic ammonia-free or low-ammonia natural latex production process becomes a necessary trend for the development of the natural rubber industry because of severe environmental pollution caused by the volatility and irritation of ammonia.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the preparation method of the ultralow-ammonia concentrated natural latex, which can achieve a good preservation effect only by adding a very small amount of ammonia in the production process of the concentrated latex, and has the advantages of small stimulation and environmental protection.
In a first aspect, the present invention provides a method for preparing an ultra-low ammonia concentrated natural rubber latex, comprising the steps of:
s1, collecting fresh latex, and pretreating;
s2, adding ammonia, a sterilization preservative and phosphate, adjusting the mass fraction of the ammonia to be 0.15-0.25%, uniformly stirring, clarifying for 8-72 hours, and removing sediments;
s3, transferring the clarified latex to a centrifuge for centrifugation, separating out skim latex and concentrated latex, transferring the concentrated latex to an adjusting tank, immediately adding the sterilizing preservative and lauric soap, fully and uniformly stirring, and performing concentrated latex accumulation to obtain concentrated latex;
s4, adjusting the dry glue content in the concentrated latex;
in the steps S2 and S3, the ratio of the sterilizing and antistaling agent is as follows: 12.5 to 16.5 portions of zinc oxide, 12.5 to 16.5 portions of accelerant TMTD, 0.01 to 0.02 portion of potassium hydroxide or sodium hydroxide, 0.025 to 0.1 portion of dispersant NNO or NF, H2O20.05 to 0.08 portion, and 66 to 75 portions of water.
Preferably, in step S1, the preprocessing process specifically includes: and (3) detecting and grading the fresh latex, and filtering the fresh latex reaching the detection standard to remove impurities.
Preferably, in the step S2, the mass ratio of the sterilizing and antistaling agent to the field latex is (0.0012-0.0025):1, the mass fraction of the phosphate is adjusted to 30% -50%, and the content of free calcium and magnesium is controlled to 80-100 mol/kg.
Preferably, the phosphate is diammonium phosphate, the concentration of which is 40%.
Preferably, in the step S3, the mass ratio of the sterilizing and antistaling agent to the concentrated milk is (0.0003-0.0007): 1; after the lauric acid soap is added, the mass fraction of the lauric acid soap is 0.03-0.07%.
Preferably, the lauric soap is potassium laurate.
Preferably, in step S2, the ratio of the sterilizing and antistaling agent is: 15 parts of zinc oxide, 15 parts of promoter TMTD, 0.01 part of sodium hydroxide, 0.1 part of dispersant NNO and H2O20.05 part and 69.84 parts of water.
Preferably, in step S2, the ratio of the sterilizing and antistaling agent is: 12.5 parts of zinc oxide, 12.5 parts of accelerator TMTD, 0.013 part of sodium hydroxide, 0.025 part of dispersant NNO, and H2O20.07 part of water and 75 parts of water.
Preferably, in step S2, the ratio of the sterilizing and antistaling agent is: 16.5 parts of zinc oxide, 16.5 parts of promoter TMTD, 0.01 part of sodium hydroxide, 0.1 part of dispersant NNO, H2O20.07 part and 66 parts of water.
In a second aspect, the present invention further provides an ultra-low ammonia concentrated natural rubber latex obtained by the above method for preparing an ultra-low ammonia concentrated natural rubber latex.
The invention has the beneficial effects that: by adding less ammonia and combining with the sterilization preservative, the preparation method of the ultralow-ammonia concentrated natural latex provided by the invention can play a role in sterilization and bacteriostasis for a long time, ensures that the latex is more stable, can reduce the using amount of ammonia, is non-irritant and environment-friendly, has a small using amount, and saves the cost.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
The preparation method of the ultralow-ammonia concentrated natural latex provided by the invention specifically comprises the following steps:
s1, collecting fresh latex, and pretreating;
s2, adding ammonia, a sterilizing and fresh-keeping agent and phosphate, uniformly stirring, clarifying for 8-72 hours, and removing sediments;
wherein the mass ratio of the sterilizing and antistaling agent to the fresh latex is (0.0012-0.0025):1, the mass fraction of the ammonia is adjusted to be 0.15-0.25%, the mass fraction of the phosphate is adjusted to be 30-50%, and the content of free calcium and magnesium is controlled to be 80-100 mol/kg; the phosphate is used for combining with free calcium and magnesium in the fresh latex, and can inhibit the coagulation of the latex on one hand and also inhibit the activation of enzyme and bacteria on the other hand; preferably, the phosphate is ammonium dihydrogen phosphate, but of course, phosphate such as dipotassium hydrogen phosphate;
s3, transferring the clarified latex to a centrifuge for centrifugation, separating out skim latex and concentrated latex, transferring the concentrated latex to an adjusting tank, immediately adding the sterilizing preservative and lauric soap, fully and uniformly stirring, and performing concentrated latex accumulation to obtain concentrated latex; wherein the mass ratio of the sterilizing and fresh-keeping agent to the concentrated milk is (0.0003-0.0007): 1; after the lauric acid soap is added, the mass fraction of the lauric acid soap is 0.03-0.07%; as the stabilizer, potassium laurate is preferably used, and sodium laurate, ammonium laurate and the like can be used. After the latex is centrifuged, the sterilization preservative and the lauric soap are rapidly added into the concentrated latex, so that good sterilization and bacteriostasis effects and stabilizing effects can be achieved.
S4, adjusting the dry gum content in the concentrated latex to 60% -60.2% according to the national standard;
wherein the ratio of the sterilizing and antistaling agent adopted in the steps S2 and S3 is as follows: 12.5 to 16.5 portions of zinc oxide, 12.5 to 16.5 portions of accelerant TMTD, 0.01 to 0.02 portion of potassium hydroxide or sodium hydroxide, 0.025 to 0.1 portion of dispersant NNO or NF, H2O20.05 to 0.08 portion of water and 66 to 75 portions of water.
The invention further protects the ultra-low ammonia concentrated natural latex prepared by the preparation method.
The sterilization preservative provided by the invention not only can play a role in sterilization and bacteriostasis for a long time, ensures that the latex properties are more stable, but also can reduce the using amount of ammonia, and is non-irritant and environment-friendly.
Example 1
A preparation method of ultra-low ammonia concentrated natural latex specifically comprises the following steps:
s1, collecting the fresh latex, detecting and grading the fresh latex, and filtering the fresh latex reaching the detection standard according to an industrial detection standard to remove impurities except the latex;
s2, adding ammonia, the sterilizing and antistaling agent and diammonium hydrogen phosphate, uniformly stirring, clarifying for 18 hours, and removing sediments; wherein the mass ratio of the sterilizing and antistaling agent to the fresh latex is 0.0012:1, the mass fraction of the ammonia is adjusted to be 0.2%, the mass fraction of the diammonium hydrogen phosphate is adjusted to be 40%, and the content of free calcium and magnesium is controlled to be 80 mol/kg.
S3, transferring the clarified latex to a centrifuge for centrifugation, separating out skim latex and concentrated latex, transferring the concentrated latex to an adjusting tank, immediately adding the sterilizing preservative and lauric soap, fully and uniformly stirring, and performing concentrated latex accumulation to obtain concentrated latex; wherein the mass ratio of the sterilizing and fresh-keeping agent to the concentrated milk is 0.0003: 1; after the potassium laurate is added, the mass fraction of the potassium laurate is 0.03%.
S4, adjusting the content of the dry glue to 60-60.2%.
Wherein the ratio of the sterilizing and antistaling agent in the steps S2 and S3 is as follows: 15 parts of zinc oxide, 15 parts of promoter TMTD, 0.01 part of sodium hydroxide, 0.1 part of dispersant NNO, H2O20.05 parts and 69.84 parts of water.
Example 2
A preparation method of ultra-low ammonia concentrated natural latex specifically comprises the following steps:
s1, collecting the fresh latex, detecting and grading the fresh latex, and filtering the fresh latex reaching the detection standard according to an industrial detection standard to remove impurities except the latex;
s2, adding ammonia, the sterilizing and antistaling agent and diammonium hydrogen phosphate, uniformly stirring, clarifying for 72 hours, and removing sediments; wherein the mass ratio of the sterilizing and antistaling agent to the fresh latex is 0.0025:1, the mass fraction of the ammonia is adjusted to be 0.15%, the mass fraction of the diammonium hydrogen phosphate is adjusted to be 30%, and the content of free calcium and magnesium is controlled to be 100 mol/kg.
S3, transferring the clarified latex to a centrifuge for centrifugation, separating out skim latex and concentrated latex, transferring the concentrated latex to an adjusting tank, immediately adding the sterilizing preservative and lauric soap, fully and uniformly stirring, and performing concentrated latex accumulation to obtain concentrated latex; wherein the mass ratio of the sterilizing and fresh-keeping agent to the concentrated milk is 0.0007: 1; after the potassium laurate is added, the mass fraction of the potassium laurate is 0.07%.
S4, adjusting the content of the dry glue to 60-60.2%.
Wherein the ratio of the sterilizing and antistaling agent in the steps S2 and S3 is as follows: 12.5 parts of zinc oxide, 12.5 parts of accelerator TMTD, 0.02 part of sodium hydroxide, 0.025 part of dispersant NNO, and H2O20.08 part and 74.875 parts of water.
Example 3
A preparation method of ultra-low ammonia concentrated natural latex specifically comprises the following steps:
s1, collecting the fresh latex, detecting and grading the fresh latex, and filtering the fresh latex reaching the detection standard according to an industrial detection standard to remove impurities except the latex;
s2, adding ammonia, the sterilizing and antistaling agent and diammonium hydrogen phosphate, uniformly stirring, clarifying for 8 hours, and removing sediments; wherein the mass ratio of the sterilizing and antistaling agent to the fresh latex is 0.0018:1, the mass fraction of the ammonia is adjusted to be 0.25%, the mass fraction of the diammonium hydrogen phosphate is adjusted to be 50%, and the content of free calcium and magnesium is controlled to be 80 mol/kg.
S3, transferring the clarified latex to a centrifuge for centrifugation, separating out skim latex and concentrated latex, transferring the concentrated latex to an adjusting tank, immediately adding the sterilizing preservative and lauric soap, fully and uniformly stirring, and performing concentrated latex accumulation to obtain concentrated latex; wherein the mass ratio of the sterilizing and fresh-keeping agent to the concentrated milk is 0.0005: 1; after the potassium laurate is added, the mass fraction of the potassium laurate is 0.05%.
S4, adjusting the content of the dry latex to 60-60.2%.
Wherein the ratio of the sterilizing and antistaling agent in the steps S2 and S3 is as follows: 16.5 parts of zinc oxide, 16.5 parts of promoter TMTD, 0.015 part of sodium hydroxide, 0.065 part of dispersant NNO, H2O20.065 parts and 66.855 parts of water.
Example 4
A preparation method of ultra-low ammonia concentrated natural latex specifically comprises the following steps:
s1, collecting the fresh latex, detecting and grading the fresh latex, and filtering the fresh latex reaching the detection standard according to an industrial detection standard to remove impurities except the latex;
s2, adding ammonia, the sterilizing and antistaling agent and diammonium hydrogen phosphate, uniformly stirring, clarifying for 18 hours, and removing sediments; wherein the mass ratio of the sterilizing and antistaling agent to the fresh latex is 0.0015:1, the mass fraction of the ammonia is adjusted to be 0.23%, the mass fraction of the diammonium hydrogen phosphate is adjusted to be 40%, and the content of free calcium and magnesium is controlled to be 80 mol/kg.
S3, transferring the clarified latex to a centrifuge for centrifugation, separating out skim latex and concentrated latex, transferring the concentrated latex to an adjusting tank, immediately adding the sterilizing preservative and lauric soap, fully and uniformly stirring, and performing concentrated latex accumulation to obtain concentrated latex; wherein the mass ratio of the sterilizing and fresh-keeping agent to the concentrated milk is 0.0005: 1; after the potassium laurate is added, the mass fraction of the potassium laurate is 0.05%.
S4, adjusting the content of the dry latex to 60-60.2%.
Wherein the ratio of the sterilizing and antistaling agent in the steps S2 and S3 is as follows: 15 parts of zinc oxide, 15 parts of promoter TMTD, 0.01 part of sodium hydroxide, 0.1 part of dispersant NNO, H2O20.05 parts and 69.84 parts of water.
Example 5
A preparation method of ultra-low ammonia concentrated natural latex specifically comprises the following steps:
s1, collecting the fresh latex, detecting and grading the fresh latex, and filtering the fresh latex reaching the detection standard according to an industrial detection standard to remove impurities except the latex;
s2, adding ammonia, the sterilizing and antistaling agent and diammonium hydrogen phosphate, uniformly stirring, clarifying for 18 hours, and removing sediments; wherein the mass ratio of the sterilizing and antistaling agent to the fresh latex is 0.0015:1, the mass fraction of the ammonia is adjusted to be 0.23%, the mass fraction of the diammonium hydrogen phosphate is adjusted to be 40%, and the content of free calcium and magnesium is controlled to be 80 mol/kg.
S3, transferring the clarified latex to a centrifuge for centrifugation, separating out skim latex and concentrated latex, transferring the concentrated latex to an adjusting tank, immediately adding the sterilizing preservative and lauric soap, fully and uniformly stirring, and performing concentrated latex accumulation to obtain concentrated latex; wherein the mass ratio of the sterilizing and fresh-keeping agent to the concentrated milk is 0.0007: 1; after the potassium laurate is added, the mass fraction of the potassium laurate is 0.06%.
S4, adjusting the content of the dry latex to 60-60.2%.
Wherein the ratio of the sterilizing and antistaling agent in the steps S2 and S3 is as follows: 12.5 parts of zinc oxide, 12.5 parts of accelerator TMTD, 0.013 part of sodium hydroxide, 0.025 part of dispersant NNO, and H2O20.07 part of water and 75 parts of water.
Example 6
A preparation method of ultra-low ammonia concentrated natural latex specifically comprises the following steps:
s1, collecting the fresh latex, detecting and grading the fresh latex, and filtering the fresh latex reaching the detection standard according to an industrial detection standard to remove impurities except the latex;
s2, adding ammonia, the sterilizing and antistaling agent and diammonium hydrogen phosphate, uniformly stirring, clarifying for 18 hours, and removing sediments; wherein the mass ratio of the sterilizing and antistaling agent to the fresh latex is 0.0010:1, the mass fraction of the ammonia is adjusted to be 0.23%, the mass fraction of the diammonium hydrogen phosphate is adjusted to be 40%, and the content of free calcium and magnesium is controlled to be 80 mol/kg.
S3, transferring the clarified latex to a centrifuge for centrifugation, separating out skim latex and concentrated latex, transferring the concentrated latex to an adjusting tank, immediately adding the sterilizing preservative and lauric soap, fully and uniformly stirring, and performing concentrated latex accumulation to obtain concentrated latex; wherein the mass ratio of the sterilizing and fresh-keeping agent to the concentrated milk is 0.00045: 1; after the potassium laurate is added, the mass fraction of the potassium laurate is 0.05%.
S4, adjusting the content of the dry latex to 60-60.2%.
Wherein the ratio of the sterilizing and antistaling agent in the steps S2 and S3 is as follows: 16.5 parts of zinc oxide, 16.5 parts of promoter TMTD, 0.01 part of sodium hydroxide, 0.1 part of dispersant NNO, H2O20.07 part and 66 parts of water.
Comparative examples
Adding ammonia into the fresh latex to ensure that the mass fraction of the ammonia reaches 0.9 percent, and finally obtaining the concentrated latex by adopting a conventional concentration preparation method.
Detecting data
The concentrated latexes obtained in examples 1 to 6 and comparative example were stored in a sealed state at a temperature of 25 ℃ or lower, and the stability after 4 months of storage was evaluated, and the evaluation results are shown in Table 1.
TABLE 1
| Detecting data | Retention time | Total solids content% | Content of dry glue% | Alkalinity (ammonia meter)% | Volatile fatty acids | Mechanical stability |
| Example 1 | 4 months old | 61.7 | 60.19 | 0.13 | 0.028 | 698 |
| Example 2 | 4 months old | 61.72 | 60.2 | 0.1 | 0.025 | 830 |
| Example 3 | 4 months old | 61.6 | 60.15 | 0.14 | 0.03 | 790 |
| Example 4 | 4 months old | 61.63 | 60.2 | 0.14 | 0.026 | 701 |
| Example 5 | 4 months old | 61.65 | 60.18 | 0.13 | 0.031 | 820 |
| Example 6 | 4 months old | 61.56 | 60.1 | 0.14 | 0.029 | 785 |
| Comparative examples | 4 months old | 61.7 | 60.2 | 0.67 | 0.037 | 700 |
As can be seen from Table 1, the concentrated natural rubber latex obtained by the method of the present invention has the same difference in properties and stability as the concentrated natural rubber latex obtained by the conventional high ammonia process,
the concentrated natural rubber latex obtained in the embodiment 2 and the embodiment 3 has mechanical stability which is even far better than that of the comparative example, so that the ultra-low ammonia concentrated natural rubber latex provided by the invention and the rubber latex obtained by the preparation method thereof not only can reach the storage life of 4 months, but also have less ammonia content, more stable rubber latex properties, environmental protection, no stimulation and wider application.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (6)
1. A preparation method of ultra-low ammonia concentrated natural latex is characterized by comprising the following steps:
s1, collecting fresh latex, and pretreating;
s2, adding ammonia, a sterilizing and fresh-keeping agent and phosphate, adjusting the mass fraction of the ammonia to be 0.15-0.25%, uniformly stirring, clarifying for 8-72 hours, and removing sediments;
s3, transferring the clarified latex to a centrifuge for centrifugation, separating out skim latex and concentrated latex, transferring the concentrated latex to an adjusting tank, immediately adding the sterilizing preservative and lauric soap, fully and uniformly stirring, and performing concentrated latex accumulation to obtain concentrated latex;
s4, adjusting the dry glue content in the concentrated latex;
in the steps S2 and S3, the ratio of the sterilizing and antistaling agent is as follows: 12.5 to 16.5 portions of zinc oxide, 12.5 to 16.5 portions of accelerant TMTD, 0.01 to 0.02 portion of potassium hydroxide or sodium hydroxide, 0.025 to 0.1 portion of dispersant NNO or NF, H2O20.05 to 0.08 portion of water and 66 to 75 portions of water;
in step S1, the preprocessing process specifically includes: detecting and grading the fresh latex, and filtering the fresh latex reaching the detection standard to remove impurities;
in the step S2, the mass ratio of the sterilizing and antistaling agent to the fresh latex is (0.0012-0.0025):1, the mass fraction of the phosphate is adjusted to be 30-50%, and the content of free calcium and magnesium is controlled to be 80-100 mol/kg;
in the step S3, the mass ratio of the sterilizing and antistaling agent to the concentrated milk is (0.0003-0.0007): 1; after the lauric acid soap is added, the mass fraction of the lauric acid soap is 0.03-0.07%; the lauric acid soap is potassium laurate.
2. The method of claim 1, wherein the step of preparing the concentrated natural latex with ultra-low ammonia comprises: in the step S2, the ratio of the sterilizing and antistaling agent is as follows: 15 parts of zinc oxide, 15 parts of promoter TMTD, 0.01 part of sodium hydroxide, 0.1 part of dispersant NNO and H2O20.05 part and 69.84 parts of water.
3. The method of claim 1, wherein the step of preparing the concentrated natural latex with ultra-low ammonia comprises: in the step S2, the ratio of the sterilizing and antistaling agent is as follows: 12.5 parts of zinc oxide, 12.5 parts of accelerator TMTD, 0.013 part of sodium hydroxide, 0.025 part of dispersant NNO, and H2O20.07 part of water and 75 parts of water.
4. The method of claim 1, wherein the step of preparing the concentrated natural latex with ultra-low ammonia comprises: in the step S2, the ratio of the sterilizing and antistaling agent is as follows: 16.5 parts of zinc oxide, 16.5 parts of promoter TMTD, 0.01 part of sodium hydroxide, 0.1 part of dispersant NNO, H2O20.07 part and 66 parts of water.
5. The method of claim 1, wherein the step of preparing the concentrated natural latex with ultra-low ammonia comprises: the phosphate is diammonium hydrogen phosphate, and the concentration of the diammonium hydrogen phosphate is 40%.
6. An ultra-low ammonia concentrated natural rubber latex obtained by the method for producing an ultra-low ammonia concentrated natural rubber latex according to any one of claims 1 to 5.
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| CN112011101A (en) * | 2020-08-17 | 2020-12-01 | 南通梦吉妮家用纺织品有限公司 | Green and environment-friendly natural latex and ammonia-free preservation method thereof |
| CN113429498B (en) * | 2021-06-22 | 2022-05-24 | 海南天然橡胶产业集团金橡有限公司 | Preparation method of low-ammonia natural concentrated latex |
| CN113583153A (en) * | 2021-07-27 | 2021-11-02 | 海南禾木橡胶科技有限公司 | Micro-ammonia concentrated latex, pre-compounded latex, preparation method and application thereof |
| CN113773415A (en) * | 2021-09-16 | 2021-12-10 | 中国热带农业科学院橡胶研究所 | Method for improving quality consistency of whole latex |
| CN113831425A (en) * | 2021-09-30 | 2021-12-24 | 海南观形科技有限公司 | Natural latex preservative and concentrated natural latex prepared by using same |
| CN113929977B (en) * | 2021-11-05 | 2023-07-14 | 中国热带农业科学院橡胶研究所 | Ageing-resistant high-strength natural rubber and preparation method thereof |
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