CN112574331A - Composite preservative for latex, preparation method of composite preservative and ammonia-free latex - Google Patents
Composite preservative for latex, preparation method of composite preservative and ammonia-free latex Download PDFInfo
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- CN112574331A CN112574331A CN202011447943.0A CN202011447943A CN112574331A CN 112574331 A CN112574331 A CN 112574331A CN 202011447943 A CN202011447943 A CN 202011447943A CN 112574331 A CN112574331 A CN 112574331A
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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
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/02—Organic and inorganic ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
- C08K5/098—Metal salts of carboxylic acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
- C08K5/39—Thiocarbamic acids; Derivatives thereof, e.g. dithiocarbamates
- C08K5/40—Thiurams, i.e. compounds containing groups
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
- C08K5/41—Compounds containing sulfur bound to oxygen
- C08K5/42—Sulfonic acids; Derivatives thereof
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/262—Alkali metal carbonates
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Abstract
The invention belongs to the technical field of rubber, and particularly relates to a composite preservative for latex, a preparation method of the composite preservative and ammonia-free latex. The invention introduces the ammonia-free strong basic acid salt into the preservative for the first time, maintains the stability of the pH value of the latex by utilizing the buffering action after the preservative is added into the concentrated natural latex, and improves the stability and the product quality of the latex under the combined action of the preservative and other additives. The results of the examples show that the ammonia-free latex prepared by the composite preservative for latex has stable pH value, the volatile fatty acid value is less than or equal to 0.021, the mechanical stability is more than or equal to 610s, and the thermal stability is more than or equal to 60 s.
Description
Technical Field
The invention belongs to the technical field of rubber, and particularly relates to a composite preservative for latex, a preparation method of the composite preservative and ammonia-free latex.
Background
Latex is complex in composition, contains abundant non-gum substances such as proteins, lipids, saccharides and inorganic salts in addition to rubber-containing hydrocarbons, is easily deteriorated by enzymes and bacteria, and affects the stability and processability of latex, so that a certain amount of a preservative is required to be added to ensure the stability of latex. Currently, ammonia and its ammonia compound preservative are mainly used as the preservative of natural latex and concentrated latex. However, the volatility and irritation of ammonia easily cause environmental pollution and harm the health of operators, so the development of ammonia-free preservatives is an inevitable trend in the natural rubber industry.
At present, Chinese patent with publication No. CN108690147A discloses an ammonia-free preservative for concentrated natural latex, which can replace liquid ammonia to preserve the concentrated natural latex, but the obtained latex product has poor forming and slower vulcanization speed, thereby affecting the wide application of the technology; chinese patent publication No. CN103113631A discloses an ammonia-free preservation system for natural latex, but it has poor preservation effect and high cost, and it is difficult to solve the problem of low thermal stability of concentrated natural latex.
Therefore, it is urgent to develop an ammonia-free preservative which is low in cost and can improve the stability and product quality of concentrated natural latex.
Disclosure of Invention
The invention aims to provide a composite preservative for latex and ammonia-free latex, and the composite preservative provided by the invention can maintain the pH value of the latex to be stable, improve the mechanical stability and the thermal stability of the latex and further improve the processing performance and the product quality of the latex.
In order to achieve the above purpose, the invention provides the following technical scheme:
the invention provides a composite preservative for latex, which comprises the following components in percentage by mass: 2-3% of potassium carbonate, 5-15% of potassium bicarbonate, 3-10% of potassium hydroxide, 3-8% of potassium laurate, 0.5-3% of zinc oxide, 0.5-3% of tetramethylthiuram disulfide, 2-4% of sodium methylene dinaphthalene sulfonate and the balance of water.
Preferably, the composite preservative comprises the following components in percentage by mass: 2.5 percent of potassium carbonate, 10 percent of potassium bicarbonate, 5 percent of potassium hydroxide, 6.5 percent of potassium laurate, 1.5 percent of zinc oxide, 1.5 percent of tetramethyl thiuram disulfide, 3 percent of methylene dinaphthalene sodium sulfonate and the balance of water.
Preferably, the pH value of the composite preservative for latex is 11.0-11.5.
Preferably, the water is soft water.
The invention also provides a preparation method of the composite preservative for the latex, which comprises the following steps:
providing a potassium laurate solution;
mixing tetramethylthiuram disulfide, zinc oxide and sodium methylene dinaphthalene sulfonate to obtain a bacteriostatic enzyme inhibitor mixture;
providing a buffer solution of potassium carbonate, potassium bicarbonate and potassium hydroxide;
and mixing the potassium laurate solution, the bacteriostatic enzyme inhibitor mixture and the buffer solution to obtain the composite preservative for latex.
Preferably, the pH value of the potassium laurate solution is more than or equal to 8.5.
Preferably, before the potassium laurate solution, the bacteriostatic enzyme inhibitor mixture and the buffer solution are mixed, the bacteriostatic enzyme inhibitor mixture is ground, and the particle size of the ground mixture is 2-5 microns.
The invention also provides an ammonia-free latex which comprises a latex base stock and the composite preservative agent as defined in any one of claims 1 to 4 or the composite preservative agent obtained by the preparation method as defined in any one of claims 5 to 8.
Preferably, the pH value of the ammonia-free latex is 9.5-10.
Preferably, the composite preservative accounts for 0.5-1.5 wt% of the latex base material.
The invention provides a composite preservative for latex, which comprises the following components in percentage by mass: 2-3% of potassium carbonate, 5-15% of potassium bicarbonate, 3-10% of potassium hydroxide, 3-8% of potassium laurate, 0.5-3% of zinc oxide, 0.5-3% of tetramethylthiuram disulfide, 2-4% of sodium methylene dinaphthalene sulfonate and the balance of water. The invention takes potassium carbonate and potassium bicarbonate composite strong base weak acid salt as a pH value maintaining agent in a preservative, and after the potassium carbonate and the potassium bicarbonate composite strong base weak acid salt are added into latex, the stability of the pH value of the latex is maintained by utilizing the buffering action of the potassium carbonate and the potassium bicarbonate composite strong base weak acid salt; the potassium hydroxide and the potassium laurate are used as stabilizing agents in a stable pH value system, so that the mechanical stability and the thermal stability of the latex are improved, and the processing performance and the product quality of the latex are improved under the combined action of the stabilizing agents and other additives. The results of the examples show that the ammonia-free latex prepared by the composite preservative for latex has stable pH value, the volatile fatty acid value is less than or equal to 0.021, the mechanical stability is more than or equal to 610s, and the thermal stability is more than or equal to 60 s.
Detailed Description
The invention provides a composite preservative for latex, which comprises the following components in percentage by mass: 2-3% of potassium carbonate, 5-15% of potassium bicarbonate, 3-10% of potassium hydroxide, 3-8% of potassium laurate, 0.5-3% of zinc oxide, 0.5-3% of tetramethylthiuram disulfide, 2-4% of sodium methylene dinaphthalene sulfonate and the balance of water.
In the present invention, as the raw material, commercially available products known to those skilled in the art may be used unless otherwise specified.
The composite preservative for the latex comprises, by mass, 2-3% of potassium carbonate, more preferably 2.1-2.9%, and even more preferably 2.2-2.8%.
The composite preservative for the latex comprises, by mass, 5-15% of potassium bicarbonate, more preferably 6-14% of potassium bicarbonate, and even more preferably 7-13% of potassium bicarbonate. According to the invention, the strong base and the weak acid salt are obtained by compounding potassium carbonate and potassium bicarbonate, and the buffering effect of the strong base and the weak acid salt on the pH value is utilized to add the strong base and the weak acid salt into the latex, so that the pH value of the latex can be maintained to be stable.
The composite preservative for the latex comprises 3-10% by mass of potassium hydroxide, preferably 4-9% by mass of potassium hydroxide, and more preferably 5-8% by mass of potassium hydroxide. According to the invention, potassium hydroxide is added into the prepared buffer solution to adjust the pH value of the buffer solution, and meanwhile, after the potassium hydroxide is added into the latex, the electrokinetic potential of colloidal particles can be increased, and under the synergistic effect of potassium laurate, the mechanical stability of the latex is improved, and the thermal stability is further improved.
The composite preservative for latex comprises 3-8% by mass of potassium laurate, more preferably 4-7% by mass of potassium laurate, and even more preferably 5-6% by mass of potassium laurate. The invention takes the potassium laurate as the stabilizer in the latex preservative, can increase the negative charge of colloidal particles, increase the repulsive potential energy and greatly improve the mechanical stability of the latex.
The composite preservative for latex comprises 0.5-3% of zinc oxide by mass percentage, more preferably 0.8-2.7% of zinc oxide by mass percentage, and more preferably 1.0-2.5% of zinc oxide by mass percentage. According to the invention, zinc oxide is added into the latex, and the zinc oxide can be used as a vulcanization activator of the latex and is combined with latex molecules, so that the vulcanization time is shortened, and the finished product characteristics of the latex are improved; meanwhile, the latex can be used as an enzyme inhibitor of latex, so that the latex is prevented from being damaged by enzyme, and the stability of the latex is further improved.
The composite preservative for latex comprises 0.5-3% of tetramethylthiuram disulfide, more preferably 0.8-2.7%, and even more preferably 1.0-2.5% by mass. The latex is prevented from being damaged by bacteria by taking tetramethyl thiuram disulfide as a bacteriostatic agent of the latex.
The composite preservative for the latex comprises 2-4% of methylene dinaphthalene sodium sulfonate, preferably 2.5-3.5% of methylene dinaphthalene sodium sulfonate, and more preferably 3% of methylene dinaphthalene sodium sulfonate. According to the invention, the sodium methylene dinaphthalene sulfonate is added into the latex, so that the dispersibility and wettability of the latex can be improved.
The composite preservative for latex provided by the invention comprises the balance of water in percentage by mass, wherein the content of the water is such that the percentage content of the composite preservative reaches 100%. In the present invention, the water is preferably soft water. The invention takes soft water as the dispersion medium of the composite preservative, and can prevent the influence of metal ions on the stability of latex.
In the embodiment of the invention, the composite preservative for latex preferably comprises the following components in percentage by mass: 2.5 percent of potassium carbonate, 10 percent of potassium bicarbonate, 5 percent of potassium hydroxide, 6.5 percent of potassium laurate, 1.5 percent of zinc oxide, 1.5 percent of tetramethyl thiuram disulfide, 3 percent of methylene dinaphthalene sodium sulfonate and the balance of water.
In the invention, the pH value of the composite preservative for latex is preferably 11.0 to 11.5, more preferably 11.1 to 11.4, and even more preferably 11.2 to 11.3.
The invention also provides a preparation method of the composite preservative for the latex in the technical scheme, which comprises the following steps:
providing a potassium laurate solution;
mixing tetramethylthiuram disulfide, zinc oxide and sodium methylene dinaphthalene sulfonate to obtain a bacteriostatic enzyme inhibitor mixture;
providing a buffer solution of potassium carbonate, potassium bicarbonate and potassium hydroxide;
the invention provides a potassium laurate solution. In the present invention, there is no particular requirement on the source of the potassium laurate solution, and the potassium laurate solution may be a commercially available potassium laurate solution or a self-made potassium laurate solution. In the invention, the potassium laurate solution is preferably obtained by a self-made method. In the present invention, the potassium laurate solution is preferably prepared by dissolving potassium hydroxide and lauric acid in water to obtain a potassium laurate solution. In the present invention, the mass ratio of potassium hydroxide and lauric acid is preferably 0.3: 1. in the present invention, the dissolution is preferably performed under conditions of stirring and heating, and the stirring is preferably mechanical stirring. In the invention, no special requirement is required on the condition parameters of the mechanical stirring, and a uniform mixed solution can be obtained. In the invention, the heating is preferably water bath heating, and the heating temperature is preferably 50-70 ℃, more preferably 55-65 ℃, and even more preferably 60 ℃. In the present invention, the water is preferably soft water; the total solids concentration of the potassium laurate solution is preferably equal to or greater than 21%, and in particular embodiments of the invention, the total solids concentration of the potassium laurate solution can be 25%. In the present invention, the pH of the potassium laurate solution is preferably 8.5 or more, and in a specific embodiment of the present invention, the pH of the potassium laurate solution may be 9.0.
The invention mixes tetramethyl thiuram disulfide, zinc oxide and methylene dinaphthalene sodium sulfonate to obtain the bacteriostatic enzyme inhibitor mixture. After obtaining the bacteriostatic enzyme inhibitor mixture, the invention preferably also comprises grinding the mixture; in the present invention, soft water is preferably added to the mixture for milling. The particle size after grinding is preferably 2 to 5 μm, more preferably 2.5 to 4.5 μm, and still more preferably 3 μm. When the bacteriostatic enzyme inhibitor mixture is obtained by adding water and grinding, the total solid concentration of the bacteriostatic enzyme inhibitor mixture is preferably 40-60%, more preferably 45-55%, and even more preferably 50%. According to the invention, the mixture of the bacteriostatic enzyme inhibitor is ground, so that the particle size of the mixture can be reduced, the bacteriostatic enzyme inhibitor can be better dispersed in latex, and the bacteriostatic enzyme inhibitor has better effect.
The present invention provides a buffer solution of potassium carbonate, potassium bicarbonate and potassium hydroxide. In the present invention, the buffer solution is preferably prepared by dissolving potassium carbonate, potassium bicarbonate and potassium hydroxide in soft water. The present invention does not require any particular means for dissolution, and may be carried out in a manner known to those skilled in the art. In the invention, the pH value of the buffer solution is preferably 11.0-13.9, more preferably 11.5-13.5, and even more preferably 12-13. In the present invention, the total solid concentration of the buffer solution is preferably not less than 30%, and in a specific embodiment of the present invention, the total solid concentration of the buffer solution may be 35%. The pH value of the buffer solution can be adjusted by adding potassium hydroxide into potassium carbonate and potassium bicarbonate.
The potassium laurate solution, the bacteriostatic enzyme inhibitor mixture and the buffer solution are mixed to obtain the composite preservative for latex. The present invention does not require special means for such mixing, and may be practiced in a manner well known to those skilled in the art. In the present invention, the total solid concentration of the composite preservative for latex is preferably 20 to 35%, more preferably 21 to 34%, and still more preferably 22 to 33%.
According to the invention, the potassium laurate solution, the bacteriostatic enzyme inhibitor mixture and the buffer solution are separately prepared, so that on one hand, each component can better play a role, and the stability of the latex is improved; meanwhile, the time cost can be saved, and the production efficiency can be improved. In practical application, when a supply is needed, the prepared mixture of the potassium laurate solution and the bacteriostatic enzyme inhibitor is directly compounded with the buffer solution to obtain the required compound preservative, so that the preservative can be supplied to the market with high efficiency and can better meet the market demand.
The invention also provides ammonia-free latex which comprises a latex base stock and the composite preservative in any one of the technical schemes or the composite preservative obtained by the preparation method in any one of the technical schemes.
The dosage of the composite preservative is preferably adjusted according to the pH value of the latex base stock, so that the pH value of the latex is 9.5-10; in the invention, the pH value of the ammonia-free latex is preferably 9.5-10, more preferably 9.6-9.9, and more preferably 9.7-9.8; the composite preservative preferably accounts for 0.5-1.5 wt.%, more preferably 0.6-1.4 wt.%, and even more preferably 0.7-1.3 wt.% of the latex binder. The invention has no special requirement on the source of the latex base material, and the stability can be improved by adjusting the pH value at will; in embodiments of the invention, concentrated natural rubber latex may be specified. The ammonia-free composite preservative provided by the invention can keep the stability of latex without adding ammonia water during the preparation of the latex, so that the ammonia-free latex is obtained, the volatilization irritation and the environmental hazard of the latex are reduced, and the body health of operators is protected.
In order to further illustrate the present invention, the following examples are provided to describe a composite preservative for latex, a method for preparing the same, and an ammonia-free latex in detail, but they should not be construed as limiting the scope of the present invention.
Example 1
1. Preparation of Potassium laurate solution
Adding potassium hydroxide and lauric acid (the mass ratio of the potassium hydroxide to the lauric acid is 0.3: 1) into soft water, heating in a water bath to 60 ℃ under mechanical stirring, and dissolving to obtain a potassium laurate solution, wherein the total solid concentration of the potassium laurate solution is 25%, and the pH value is 9.0;
2. preparation of composite preservative
Preparing materials according to the mass percentage: 2.5 percent of potassium carbonate, 10 percent of potassium bicarbonate, 5 percent of potassium hydroxide, 6.5 percent of potassium laurate, 1.5 percent of zinc oxide, 1.5 percent of tetramethyl thiuram disulfide, 3 percent of methylene dinaphthalene sodium sulfonate and the balance of water.
Mixing tetramethylthiuram disulfide, zinc oxide and sodium methylene dinaphthalene sulfonate, adding soft water, and grinding to obtain an antibacterial enzyme inhibitor mixture with a particle size of 3 μm and a total solid concentration of 50%;
dissolving potassium hydroxide, potassium carbonate and potassium bicarbonate in soft water to obtain a buffer solution, wherein the pH value of the buffer solution is 11.5, and the total solid concentration is 35%;
and (3) mixing the potassium laurate solution, the antibacterial enzyme inhibitor mixture and the buffer solution to obtain the composite preservative for the latex, wherein the pH value of the composite preservative is 11.0, and the total solid concentration is 25%.
Example 2
The composite preservative for latex obtained in example 1 was added to the concentrated natural latex to obtain ammonia-free latex, wherein the composite preservative for latex accounted for 0.8 wt.% of the concentrated natural latex and had a pH of 9.60.
Example 3
The composite preservative for latex obtained in example 1 was added to the concentrated natural latex to obtain ammonia-free latex, wherein the composite preservative for latex accounted for 1.0 wt.% of the concentrated natural latex and had a pH of 9.70.
Example 4
The composite preservative for latex obtained in example 1 was added to the concentrated natural latex to obtain ammonia-free latex, wherein the composite preservative for latex accounted for 1.2 wt.% of the concentrated natural latex and had a pH of 9.75.
Comparative example 1
0.7 wt.% of aqueous ammonia was added to the concentrated natural latex to obtain an ammonia-containing latex having a pH of 10.6.
Characterization and results of Performance
Description of the Performance detection method:
the pH value is measured according to the method GB/T18012-2008;
the volatile fatty acid value is measured according to the method GB/T8292-2008;
the dry glue content is measured according to the method GB/T8299-2008;
the mechanical stability is measured according to the method GB/T8301-2008;
the thermal stability was measured by a jacket thermal stability measuring method.
The latices obtained in the different examples and comparative examples were tested according to the above method after storage for different periods of time, and the results are shown in Table 1.
TABLE 1 results of performance test of latexes obtained in examples 2 to 4 and comparative example 1
As can be seen from Table 1, the ammonia-free latex prepared by using the composite preservative for latex obtained by the invention has stable pH value, volatile fatty acid value less than or equal to 0.021, dry gum content more than or equal to 60.03, mechanical stability more than or equal to 610s and thermal stability more than or equal to 60s, and all meet the industrial standard. Compared with the latex containing ammonia, the mechanical stability is slightly improved, and the thermal stability is obviously improved. Meanwhile, the obtained ammonia-free latex has no pungent smell, is green and environment-friendly, improves the production environment, and protects the health of operators.
Although the above embodiments have been described in detail, they are only a part of the embodiments of the present invention, not all of the embodiments, and other embodiments can be obtained without inventive step according to the embodiments, and all of the embodiments belong to the protection scope of the present invention.
Claims (10)
1. A composite preservative for latex comprises the following components in percentage by mass: 2-3% of potassium carbonate, 5-15% of potassium bicarbonate, 3-10% of potassium hydroxide, 3-8% of potassium laurate, 0.5-3% of zinc oxide, 0.5-3% of tetramethylthiuram disulfide, 2-4% of sodium methylene dinaphthalene sulfonate and the balance of water.
2. The composite preservative according to claim 1, characterized by comprising the following components in percentage by mass: 2.5 percent of potassium carbonate, 10 percent of potassium bicarbonate, 5 percent of potassium hydroxide, 6.5 percent of potassium laurate, 1.5 percent of zinc oxide, 1.5 percent of tetramethyl thiuram disulfide, 3 percent of methylene dinaphthalene sodium sulfonate and the balance of water.
3. The composite preservative according to claim 1 or 2, wherein the pH of the composite preservative for latex is 11.0 to 11.5.
4. The composite preservative according to claim 1 or 2, wherein the water is soft water.
5. The method for producing the composite preservative for latex according to any one of claims 1 to 4, comprising the steps of:
providing a potassium laurate solution;
mixing tetramethylthiuram disulfide, zinc oxide and sodium methylene dinaphthalene sulfonate to obtain a bacteriostatic enzyme inhibitor mixture;
providing a buffer solution of potassium carbonate, potassium bicarbonate and potassium hydroxide;
and mixing the potassium laurate solution, the bacteriostatic enzyme inhibitor mixture and the buffer solution to obtain the composite preservative for latex.
6. The method according to claim 5, wherein the pH value of the potassium laurate solution is 8.5 or more.
7. The preparation method according to claim 5, wherein before the potassium laurate solution, the bacteriostatic enzyme inhibitor mixture and the buffer solution are mixed, the method further comprises grinding the bacteriostatic enzyme inhibitor mixture, and the particle size after grinding is 2-5 μm.
8. An ammonia-free latex, comprising a latex base stock and the composite preservative as defined in any one of claims 1 to 4 or the composite preservative obtained by the preparation method as defined in any one of claims 5 to 7.
9. The ammonia-free latex according to claim 8, wherein the pH of the ammonia-free latex is 9.5 to 10.
10. The ammonia-free latex according to claim 8, wherein the composite preservative agent accounts for 0.5-1.5 wt.% of the latex binder.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
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| GB1517025A (en) * | 1975-08-20 | 1978-07-05 | Malaysia Rubber Res Inst | Preservation of natural rubber latex |
| CN105601767A (en) * | 2016-02-02 | 2016-05-25 | 广东多正化工科技有限公司 | Preparation method of net flavor natural rubber latex |
| GB201718437D0 (en) * | 2016-11-09 | 2017-12-20 | Four D Rubber Company Ltd | Antimicrobial rubber and processes for making the same |
| CN108383929A (en) * | 2018-02-08 | 2018-08-10 | 中国热带农业科学院橡胶研究所 | A kind of no ammonia preserves composition and its product |
| CN108690147A (en) * | 2018-05-16 | 2018-10-23 | 北京天瑞博生物科技有限公司 | A kind of environmental type concentrated natural latex and preparation method thereof |
| CN109369826A (en) * | 2018-09-21 | 2019-02-22 | 昌江金达乳胶制品有限公司 | Production method of ammonia-free natural concentrated latex |
| CN109988257A (en) * | 2019-04-19 | 2019-07-09 | 中国热带农业科学院橡胶研究所 | A kind of natural fresh latex is without ammonia preservative agent |
| CN110066429A (en) * | 2019-04-19 | 2019-07-30 | 中国热带农业科学院橡胶研究所 | A kind of low ammonia or the application without ammoniacal latex in medical catheter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
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