阅读说明：本技术 天然橡胶胶乳常温保鲜剂及其制备方法、使用方法及应用 (Natural rubber latex normal-temperature preservative and preparation method, use method and application thereof ) 是由 吴丽 于 2020-07-15 设计创作，主要内容包括：本发明公开了一种天然橡胶胶乳常温保鲜剂及其制备方法、使用方法及应用,天然橡胶胶乳常温保鲜剂包括以下的组分：碱性电解水、壳聚糖、双乙酸钠、乳酸链球菌素、海藻酸纳、尼泊金乙酯、山梨酸钠。本发明天然橡胶胶乳常温保鲜剂用于生产婴儿奶嘴,使得婴儿奶嘴用的天然橡胶胶乳原料流动性好,耐热老化性,增加撕裂强度、透明度等特点,符合ROHS等环保要求,要达到食品级天然橡胶标准要求；生产出的婴儿奶嘴具有无味、无毒、无刺激,对人体无毒无副作用,还能降低婴儿奶嘴中水溶性蛋白含量,避免婴儿对水溶性蛋白过敏及伤害,而且生产出来的婴儿奶嘴抗扯性增强。(The invention discloses a natural rubber latex normal-temperature preservative, a preparation method, a use method and application thereof, wherein the natural rubber latex normal-temperature preservative comprises the following components: alkaline electrolyzed water, chitosan, sodium diacetate, nisin, sodium alginate, ethylparaben and sodium sorbate. The natural rubber latex normal-temperature preservative is used for producing baby nipples, so that the natural rubber latex for the baby nipples has the characteristics of good fluidity, heat aging resistance, increased tearing strength, increased transparency and the like, meets the environmental protection requirements of ROHS and the like, and meets the standard requirement of food-grade natural rubber; the produced baby nipple is tasteless, nontoxic and nonirritating, has no toxic or side effect on human bodies, can reduce the content of water-soluble protein in the baby nipple, avoids the allergy and the damage of babies to the water-soluble protein, and enhances the tearing resistance of the produced baby nipple.)

1. A natural rubber latex normal-temperature preservative is characterized by comprising the following components: alkaline electrolyzed water, chitosan, sodium diacetate, nisin, sodium alginate, ethylparaben and sodium sorbate.

2. The natural rubber latex normal-temperature preservative according to claim 1, which is characterized by comprising the following components: 1-20 parts of alkaline electrolyzed water, 1-15 parts of chitosan, 0.5-10 parts of sodium diacetate, 0.1-5 parts of nisin, 1-10 parts of sodium alginate, 0.1-5 parts of ethylparaben and 0.5-5 parts of sodium sorbate.

3. The natural rubber latex normal-temperature preservative according to claim 2, which is characterized by comprising the following components: 3-7 parts of alkaline electrolyzed water, 1-4 parts of chitosan, 0.5-3 parts of sodium diacetate, 0.1-1 part of nisin, 1-5 parts of sodium alginate, 0.2-1 part of ethylparaben and 0.5-2 parts of sodium sorbate.

4. The natural rubber latex normal-temperature preservative according to any one of claims 1 to 3, characterized in that: the pH value of the alkaline electrolyzed water is 10-15.

5. The natural rubber latex normal-temperature preservative according to claim 4, characterized in that: the pH value of the alkaline electrolyzed water is 11.

6. A method for preparing the natural rubber latex normal-temperature preservative according to claim 1, which is characterized by comprising the following steps: fully mixing the chitosan, sodium diacetate, nisin, sodium alginate, ethyl p-hydroxybenzoate and sodium sorbate powder uniformly, adding alkaline electrolyzed water, fully stirring uniformly, filling into a black plastic bottle or barrel, sealing, and keeping in the shade for later use.

7. A use method of the natural rubber latex normal-temperature preservative according to claim 1, which is characterized by comprising the following steps: adding a preservative into the collected clean natural rubber fresh latex in time, fully and uniformly stirring, supplementing the preservative at any time in the transportation process according to the needs, and controlling the pH value of the fresh latex to be more than or equal to 8.

8. The use method of the natural rubber latex normal-temperature preservative according to claim 7, characterized in that: 1-5% of preservative by weight is added into the natural rubber fresh latex.

9. The use method of the natural rubber latex normal-temperature preservative according to claim 8, characterized in that: the fresh latex of the natural rubber is added with 2 percent of antistaling agent by weight.

10. The natural rubber latex normal-temperature preservative according to claim 1, which is applied to food-grade and medical-grade rubber products.

Technical Field

The invention belongs to the technical field of natural rubber, relates to an additive for improving the quality of natural rubber latex, and particularly relates to a food-grade and medical-grade natural rubber latex normal-temperature preservative, a preparation method and a use method.

Background

Rubber is an important industrial raw material, and is called four industrial raw materials with steel, petroleum and coal. The rubber has extremely wide application due to the specific high elasticity and good physical and mechanical properties and electrical insulation performance, and the natural rubber is widely used in food and medical products. The consumption of rubber is therefore high. Commonly used rubbers include natural and synthetic rubbers. The worldwide demand is up to 2000 ten thousand tons at present, wherein 1200 ten thousand tons of synthetic rubber and 800 ten thousand tons of natural rubber are available. But synthetic rubber cannot replace natural rubber. The natural rubber yield of China only accounts for 7 percent of the world, and the demand accounts for more than 22 percent of the world.

Natural rubber is rubber extracted from rubber-containing plants. The latex collected from the rubber tree is a milky white liquid, similar in appearance to milk; it is a product biosynthesized by rubber trees, has very complex components, contains rich non-rubber substances such as protein, saccharides, lipid, inorganic salt, enzyme and the like besides rubber hydrocarbon and water, is easy to decay and solidify quickly under the action of bacteria and enzyme, and thus has influence on the quality and economic benefit of products.

For a long time, in rubber production, in order to prevent the volatile acid value of fresh latex from rising, keep fresh latex from putrefactive and coagulating before processing and keep processing stability, it is a common practice to add ammonia water for preservation after collection. However, ammonia has a strong pungent odor and is corrosive, which seriously affects the working and production environment, harms the health of workers, pollutes the environment, is toxic and carcinogenic, and damages the performance and quality of the natural rubber latex.

With the 'two children' policy released in China, the infant products are growing continuously, and the quality problem is highlighted day by day. The safety, sanitation and health indexes related to the nipple are greatly increased in the countries in the last two years, and compared with the old standard, the new national standard of the nipple modifies the application range: the new standard is suitable for nipples processed by taking liquid rubber as a main raw material, the raw material requirements for nipple production are increased, the physical and chemical indexes are modified and greatly increased, the requirements for infant products are becoming more and more severe, the rubber raw material for the nipples is colorless, odorless, nontoxic, high-temperature resistant, low-temperature resistant, good in fluidity, fast in vulcanization, fast in forming speed, resistant to oxidation, resistant to heat aging, excellent in tear strength and high in transparency, the products meet the environment-friendly requirements such as ROHS and the like, and the food-grade standard requirements are met.

Therefore, researches on novel nontoxic food and medical products and ammonia-free nontoxic natural rubber latex normal-temperature preservative and method for replacing the traditional ammonia-added preservation are urgent.

Disclosure of Invention

The invention aims to provide a natural rubber latex normal-temperature preservative which is free of ammonia and non-toxic, overcomes the defect of using ammonia water for preservation, improves the quality of natural rubber and can be applied to various fields.

In order to achieve the purpose, the technical scheme of the invention is as follows: the natural rubber latex normal-temperature preservative comprises the following components: alkaline electrolyzed water, chitosan, sodium diacetate, nisin, sodium alginate, ethylparaben and sodium sorbate.

Further, 1-20 parts of alkaline electrolyzed water, 1-15 parts of chitosan, 0.5-10 parts of sodium diacetate, 0.1-5 parts of nisin, 1-10 parts of sodium alginate, 0.1-5 parts of ethylparaben and 0.5-5 parts of sodium sorbate.

Further, 3-7 parts of alkaline electrolyzed water, 1-4 parts of chitosan, 0.5-3 parts of sodium diacetate, 0.1-1 part of nisin, 1-5 parts of sodium alginate, 0.2-1 part of ethylparaben and 0.5-2 parts of sodium sorbate.

Further, the pH value of the alkaline electrolyzed water is 10-15.

Further, the PH of the alkaline electrolyzed water is 11.

Further, the chitosan, sodium diacetate, nisin, sodium alginate, ethylparaben and sodium sorbate are fully and uniformly mixed, alkaline electrolyzed water is added and fully and uniformly stirred, the mixture is filled into a black plastic bottle or barrel and sealed, and the black plastic bottle or barrel is placed in a dark place for standby.

The use method of the natural rubber latex normal-temperature preservative comprises the following steps: adding a preservative into the collected clean natural rubber fresh latex in time, fully and uniformly stirring, supplementing the preservative at any time in the transportation process according to the needs, and controlling the pH value of the fresh latex to be more than or equal to 8.

Further, 1-5% of preservative by weight is added into the natural rubber fresh latex; the amount added is preferably 2%.

The natural rubber latex normal-temperature preservative is applied to food-grade and medical-grade rubber products, in particular to baby nipple products.

Compared with the prior art, the invention has the beneficial effects that:

1. the natural rubber latex normal-temperature preservative has no ammonia, so that downstream manufacturers can avoid a deamination process, the waste water and gas emission is reduced, and the overall production cost is reduced;

2. by using the natural rubber latex normal-temperature preservative, the fresh natural rubber latex has long preservation time at normal temperature, and the preservation time can reach more than 180 days;

3. the baby nipple is produced by using the natural rubber latex normal-temperature preservative disclosed by the invention, so that the natural rubber latex for the baby nipple has the characteristics of good fluidity, heat aging resistance, increased tearing strength, increased transparency and the like, meets the environmental protection requirements such as ROHS (restriction of hazardous substances) and the like, and meets the standard requirement of food-grade natural rubber; the produced baby nipple is tasteless, nontoxic and nonirritating, has no toxic or side effect on human bodies, can reduce the content of water-soluble protein in the baby nipple, avoids the allergy and the damage of babies to the water-soluble protein, and enhances the tearing resistance of the produced baby nipple;

4. indexes such as ash content, ammonia content, volatile components, initial plasticity value, plasticity retention rate, Mooney viscosity, smell and the like of the fresh natural rubber latex preserved by using the preservative meet the requirements of related quality indexes;

5. the invention uses strong alkaline electrolyzed water, which not only greatly reduces the cost of raw materials, but also increases the fresh-keeping effect of the fresh-keeping agent, thereby improving the quality of the fresh-keeping agent.

Detailed Description