CN112048029A - Method for preparing standard rubber by using skim latex - Google Patents
Method for preparing standard rubber by using skim latex Download PDFInfo
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- CN112048029A CN112048029A CN202010999798.0A CN202010999798A CN112048029A CN 112048029 A CN112048029 A CN 112048029A CN 202010999798 A CN202010999798 A CN 202010999798A CN 112048029 A CN112048029 A CN 112048029A
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- rubber
- skim
- enzyme preparation
- complex enzyme
- 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
- C08C1/04—Purifying; Deproteinising
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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
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- General Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Preparation Of Compounds By Using Micro-Organisms (AREA)
Abstract
The invention discloses a method for preparing standard rubber by using skim latex, which comprises the following steps: dissolving a complex enzyme preparation 1 containing alkaline protease and papain and a complex enzyme preparation 2 containing acidic protease and neutral protease respectively with water; adding the complex enzyme preparation 1 into the skim latex at 40 ℃, and stirring for enzymolysis; adding the complex enzyme preparation 2, and continuously stirring for enzymolysis to obtain skim latex; adding acid to coagulate the peptized clear gel after enzymolysis, and then performing coagulation curing, tabletting and granulation to obtain wet colloidal particles; and (3) soaking the wet rubber particles in 10 mass percent of sodium mercaptobenzothiazole solution for 20-30 min, taking out the wet rubber particles, and drying to obtain the standard rubber. The standard rubber prepared by the invention meets the requirements of SCR10 technical indexes in the national standard GB/T8081, and the tensile strength is up to 22.1MPa, which is 6-8 MPa higher than that of the skim rubber in the prior art.
Description
Technical Field
The invention belongs to the technical field of natural rubber processing, and particularly relates to a method for preparing standard rubber by using skim latex.
Background
Skim latex is a by-product with a dry gum content of about 5% discharged when fresh natural latex is concentrated and separated by a centrifuge to prepare concentrated latex. In this process, for every 1 ton of concentrated latex with a dry gum content of 60%, about 2 tons of fresh latex with a dry gum content of 30% are required, and 1 ton of skim latex is discharged. The content of dry rubber in the skim latex is low, the content of ammonia is high, and a large amount of sulfuric acid needs to be added to solidify the skim latex to prepare the skim latex rubber. The impurity content, ash content and nitrogen content of the skim rubber are higher than those of standard rubber, and the skim rubber can only be used for producing low-grade rubber products, so that the price is low. In order to improve the skim rubber to the standard rubber, the skim rubber is treated by alkaline protease with the activity of 50 wu/g in the prior art to prepare the standard rubber SCR 10. However, in the prior art, the enzymolysis treatment time is 24 hours, and the alkaline protease and the enzymolysis skim milk product thereof not only can generate anaphylactic reaction to human bodies, but also seriously affect sewage treatment, and the practical application is limited. Therefore, it is necessary to provide a method for preparing a standard rubber using skim rubber suitable for practical use.
Disclosure of Invention
The invention provides a method for preparing standard rubber by using skim latex in order to overcome the defects in the prior art, and the standard rubber prepared by the method meets the requirements of SCR10 technical indexes in the national standard GB/T8081.
The invention is realized by the following technical scheme: the invention discloses a method for preparing standard rubber by using skim latex, which comprises the following steps:
(1) dissolving a complex enzyme preparation 1 containing alkaline protease and papain and a complex enzyme preparation 2 containing acidic protease and neutral protease respectively with water; adding the complex enzyme preparation 1 into the skim latex at 40 ℃, and stirring for enzymolysis for 60-90 min; adding the complex enzyme preparation 2, and continuously stirring for enzymolysis to treat the skim latex for 10-20 min; adding acid to coagulate the peptized clear gel after enzymolysis, and then performing coagulation curing, tabletting and granulation to obtain wet colloidal particles;
(2) and (3) soaking the wet rubber particles in 10 mass percent of sodium mercaptobenzothiazole solution for 20-30 min, taking out the wet rubber particles, and drying to obtain the standard rubber.
Preferably, the ratio of the alkaline protease to the papain in the compound enzyme preparation 1 is 2: 1, the activity is 20 wu/g.
Preferably, the ratio of the acidic protease to the neutral protease in the complex enzyme preparation 2 is 1: 1, the activity is 5 wu/g.
Preferably, the amount of the complex enzyme preparation 1 accounts for 0.05-0.2% of the total weight of the skim latex.
Preferably, the amount of the complex enzyme preparation 2 accounts for 0.03-0.1% of the total weight of the skim latex.
The invention has the beneficial effects that: the complex enzyme preparation 1 in the invention is used for enzymolysis treatment of skim latex, the consumption time is short, only 60-90 min is needed, and the actual production and application are feasible. The complex enzyme preparation 2 can inhibit the activity of the complex enzyme preparation 1, and avoids the anaphylactic reaction of the alkaline protease and the product thereof on a human body and the influence on sewage treatment. The standard rubber prepared under the synergistic effect of the complex enzyme preparation 1 and the complex enzyme preparation 2 not only reduces the consumption of the solidification acid, but also obviously improves the performance, and the impurity content, the ash content and the nitrogen content are obviously superior to those of the skim rubber in the prior art. The invention adopts the sodium mercaptobenzothiazole solution to soak the wet colloidal particles, thereby better delaying the storage and hardening of the standard rubber and keeping the stable performance of the standard rubber. The standard rubber prepared by the method for preparing the standard rubber by using the skim rubber meets the requirements of SCR10 technical indexes in the national standard GB/T8081, and the tensile strength is up to 22.1MPa, which is 6-8 MPa higher than that of the skim rubber in the prior art.
Detailed Description
The present invention will be described in detail with reference to specific examples.
Example 1: a method for preparing standard rubber by using skim rubber, which comprises the following steps:
(1) taking 10kg of skim latex, dissolving 5g of the complex enzyme preparation 1 with the activity of 20 wumu/g in 95g of water, adding the aqueous solution of the complex enzyme preparation 1 while stirring the skim latex, and continuously stirring for enzymolysis for 90 min.
(2) Dissolving 3g of the complex enzyme preparation 2 with the activity of 5 wumu/g in 97g of water, adding the complex enzyme preparation into the skim serum, and continuously stirring the skim serum for 10min to obtain the enzymatic hydrolysis skim serum.
(3) Adding acid, coagulating and performing enzymolysis to obtain a gel clear solution, curing the gel to the next day, tabletting and granulating to obtain wet colloidal particles.
(4) And (3) soaking the wet colloidal particles in a 10% sodium mercaptobenzothiazole solution for 20min, and taking out the wet colloidal particles.
(5) The wet crumb was dried at 110 ℃ to give a standard rubber.
The basic properties of the standard rubber were determined in accordance with GB/T8081-.
Standard rubber tensile properties were determined according to GB/T528-.
Example 2: a method for preparing standard rubber by using skim rubber, which comprises the following steps:
(1) taking 10kg of skim latex, dissolving 10g of the complex enzyme preparation 1 with the activity of 20 wumu/g in 90g of water, adding the aqueous solution of the complex enzyme preparation 1 while stirring the skim latex, and continuously stirring for enzymolysis for 80 min;
(2) dissolving 5g of the complex enzyme preparation 2 with the activity of 5 ten thousand u/g in 95g of water, adding the complex enzyme preparation into the skim latex, and continuously stirring for 20min to obtain enzymolysis skim latex;
(3) adding acid, coagulating and performing enzymolysis to obtain skim milk, curing the skim milk to the next day, tabletting, and granulating to obtain wet colloidal particles;
(4) soaking the wet colloidal particles in a 10% sodium mercaptobenzothiazole aqueous solution for 20min, and taking out the wet colloidal particles;
(5) the wet crumb was dried at 110 ℃ to give a standard rubber.
The basic properties of the standard rubber were determined in accordance with GB/T8081-.
Standard rubber tensile properties were determined according to GB/T528-.
Example 3: a method for preparing standard rubber by using skim rubber, which comprises the following steps:
(1) taking 10kg of skim latex, dissolving 15g of the complex enzyme preparation 1 with the activity of 20 wumu/g in 85g of water, adding the aqueous solution of the complex enzyme preparation 1 while stirring the skim latex, and continuously stirring for enzymolysis for 70 min;
(2) dissolving 7g of the complex enzyme preparation 2 with the activity of 5 wu/g in 93g of water, adding the complex enzyme preparation into the whey, and continuously stirring for 10min to obtain enzymatic whey;
(3) adding acid, coagulating and performing enzymolysis to obtain skim milk, curing the skim milk to the next day, tabletting, and granulating to obtain wet colloidal particles;
(4) soaking the wet colloidal particles in a 10% sodium mercaptobenzothiazole aqueous solution for 30min, and taking out the wet colloidal particles;
(5) the wet crumb was dried at 110 ℃ to give a standard rubber.
The basic properties of the standard rubber were determined in accordance with GB/T8081-.
Standard rubber tensile properties were determined according to GB/T528-.
Control group 1: a process for preparing skim rubber comprising the steps of:
10kg of skim latex is taken and solidified by 5 percent sulfuric acid according to the prior production process. Curing the coagulum to the next day, and then tabletting, granulating and drying to prepare the skim latex.
The basic properties of the skim rubber were determined according to GB/T8081-.
The tensile properties of the skim rubber were determined according to GB/T528-.
Control group 2: and taking the rubber which is actually produced.
The basic properties of the skim rubber were determined according to GB/T8081-.
The tensile properties of the skim rubber were determined according to GB/T528-.
Table 1: basic properties of natural rubber
| Basic properties of rubber | Example 1 | EXAMPLE 2 | Example 3 | Control group 1 | Control group 2 |
| Impurity content,% (maximum) remaining on a 45 μm sieve | 0.05 | 0.04 | 0.03 | 1.99 | 2.49 |
| Initial value of plasticity P0(minimum value) | 44 | 46 | 40 | 36 | 34 |
| Plasticity retention ratio PRI (minimum) | 53 | 57 | 50 | 45 | 44 |
| Nitrogen content,% (maximum) | 0.72 | 0.65 | 0.54 | 1.55 | 1.42 |
| Volatile content,% (maximum) | 0.50 | 0.48 | 0.53 | 0.46 | 0.45 |
| Ash content,% (maximum) | 0.57 | 0.52 | 0.47 | 1.12 | 1.24 |
Table 2: tensile property of natural rubber
| Tensile property of rubber | Example 1 | Example 2 | Example 3 | Control group 1 | Control group 2 |
| Tensile strength, MPa | 18.1 | 22.1 | 20.2 | 13.5 | 12.1 |
As can be seen from tables 1 and 2, the standard rubber prepared by the method for preparing the standard rubber by using the skim latex of the invention has the characteristics of obviously better impurity content, initial plasticity value, plasticity retention rate, nitrogen content, ash content and the like than the skim latex, and completely meets the requirements of GB/T8081 technical indexes, particularly, the tensile strength of the standard rubber is as high as 22.1MPa, and is 6-8 MPa higher than that of the skim latex.
Finally, it should be noted that the above-mentioned contents are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, and that the simple modifications or equivalent substitutions of the technical solutions of the present invention by those of ordinary skill in the art can be made without departing from the spirit and scope of the technical solutions of the present invention.
Claims (5)
1. A method for preparing standard rubber by using skim rubber is characterized by comprising the following steps: the method for preparing the standard rubber by using the skim latex comprises the following steps of:
(1) dissolving a complex enzyme preparation 1 containing alkaline protease and papain and a complex enzyme preparation 2 containing acidic protease and neutral protease respectively with water; adding the complex enzyme preparation 1 into the skim latex at 40 ℃, and stirring for enzymolysis for 60-90 min; adding the complex enzyme preparation 2, and continuously stirring for enzymolysis to treat the skim latex for 10-20 min; adding acid to coagulate the peptized clear gel after enzymolysis, and then performing coagulation curing, tabletting and granulation to obtain wet colloidal particles;
(2) and (3) soaking the wet rubber particles in 10 mass percent of sodium mercaptobenzothiazole solution for 20-30 min, taking out the wet rubber particles, and drying to obtain the standard rubber.
2. The method for preparing standard rubber by using skim rubber according to claim 1, wherein: the proportion of alkaline protease and papain in the compound enzyme preparation 1 is 2: 1, the activity is 20 wu/g.
3. The method for preparing standard rubber by using skim rubber according to claim 1, wherein: the ratio of the acidic protease to the neutral protease in the compound enzyme preparation 2 is 1: 1, the activity is 5 wu/g.
4. The method for preparing standard rubber by using skim rubber according to claim 2, wherein: the dosage of the compound enzyme preparation 1 accounts for 0.05-0.2% of the total weight of the skim latex.
5. The method for preparing standard rubber by using skim rubber according to claim 1, wherein: the dosage of the compound enzyme preparation 2 accounts for 0.03-0.1% of the total weight of the skim latex.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010999798.0A CN112048029A (en) | 2020-09-22 | 2020-09-22 | Method for preparing standard rubber by using skim latex |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010999798.0A CN112048029A (en) | 2020-09-22 | 2020-09-22 | Method for preparing standard rubber by using skim latex |
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| CN112048029A true CN112048029A (en) | 2020-12-08 |
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| CN202010999798.0A Pending CN112048029A (en) | 2020-09-22 | 2020-09-22 | Method for preparing standard rubber by using skim latex |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB624917A (en) * | 1947-05-05 | 1949-06-17 | Colin Falconer Flint | Preservation of rubber latex |
| JP2002028936A (en) * | 2000-05-12 | 2002-01-29 | Sumitomo Rubber Ind Ltd | Method for manufacturing rubber product using deproteinized natural rubber latex |
| CN102002119A (en) * | 2010-10-09 | 2011-04-06 | 中国热带农业科学院农产品加工研究所 | Method for coagulating natural rubber fresh latex by enzymatic method |
| CN110922509A (en) * | 2019-12-04 | 2020-03-27 | 河南崤函生物科技有限公司 | Deproteinized rubber and preparation method thereof |
-
2020
- 2020-09-22 CN CN202010999798.0A patent/CN112048029A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB624917A (en) * | 1947-05-05 | 1949-06-17 | Colin Falconer Flint | Preservation of rubber latex |
| JP2002028936A (en) * | 2000-05-12 | 2002-01-29 | Sumitomo Rubber Ind Ltd | Method for manufacturing rubber product using deproteinized natural rubber latex |
| CN102002119A (en) * | 2010-10-09 | 2011-04-06 | 中国热带农业科学院农产品加工研究所 | Method for coagulating natural rubber fresh latex by enzymatic method |
| CN110922509A (en) * | 2019-12-04 | 2020-03-27 | 河南崤函生物科技有限公司 | Deproteinized rubber and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 张哲等: "高级胶清橡胶的性能", 《材料科学与工程学报》 * |
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Application publication date: 20201208 |