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Method for preventing natural latex product from blooming

A technology for natural latex and dairy products, applied in the field of latex product production technology, can solve the problems of difficult screening of auxiliaries, complex process methods, and difficulty in large-scale use, etc., and achieve the effects of reducing volatilization of water, alleviating phenomena, and alleviating frost spray.

Inactive Publication Date: 2019-12-13
SHANDONG XINGYU GLOVES
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AI Technical Summary

Problems solved by technology

The disadvantages of this method are: poor anti-blooming effect, increased process steps and increased cost
(2) Surface protection, which includes two types: a. Adding paraffin: the most common is to add paraffin to the formula, but paraffin can only be used as a protective agent under static conditions, and it is extremely unfavorable to latex products under dynamic conditions; It is also greatly affected by the ambient temperature, and after the paraffin is precipitated on the surface of the vulcanized rubber, the surface of the product will lose its luster, which is unfavorable to some latex products that require a beautiful appearance.
It is precisely because of the limitations of these conditions that this method has not been actually implemented and applied in actual production.
(3) Change the vulcanization method: a. Irradiation vulcanization: However, due to the constraints of many factors, it is difficult to use large-scale use of irradiated rubber in production
Its disadvantages are: due to the variability of the current process conditions, raw material performance and storage environment, this method cannot adapt to and meet such variable conditions, resulting in poor anti-frost effect
(5) Adsorption: Adding adjuvants with strong absorptive properties to absorb excess compounding agents has the disadvantages of difficult selection of adjuvants, high cost, difficulty in adapting to and satisfying changing conditions, and cannot fundamentally solve the problem of blooming
[0004] To sum up, the above-mentioned process methods are relatively complicated, but they all modify or change the formula composition, vulcanization process conditions and finished product surface of natural rubber latex products more or less, although it can alleviate the blooming of latex products to a certain extent. phenomenon, but at the same time at the expense of more or less sacrificing the performance or appearance of latex products, resulting in products that cannot meet relevant production standards and requirements

Method used

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  • Method for preventing natural latex product from blooming
  • Method for preventing natural latex product from blooming
  • Method for preventing natural latex product from blooming

Examples

Experimental program
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Effect test

preparation example Construction

[0044] Specifically, the preparation method comprises the following steps:

[0045] (1) Pre-vulcanization: Take natural rubber latex, vulcanizing agent, anti-aging agent and accelerator by weight and put them into the vulcanization tank, slowly heat up to 50-70°C within 1-3h for pre-vulcanization, then keep warm for 1-3h, and cool After reaching 25-35°C, add an activator and a stabilizer, stir evenly, leave for 30-60 hours to obtain pre-vulcanized latex, and adjust the concentration of the pre-vulcanized latex to 50-65wt% with ammonia water;

[0046] (2) Molding: casting method, dipping method or extrusion method:

[0047] The casting method comprises the following steps: pour the natural rubber latex into the mold, place it at room temperature for 12-24 hours, place it in an oven at 40-60°C, and demould;

[0048] The impregnation method includes the following steps: take the impregnation mold and place it in an oven until the surface temperature is 55-65°C, dip the coagulant...

Embodiment 1

[0053] From the vulcanization workshop of natural latex gloves, a total of 3 samples of the same batch of natural latex gloves that had just completed the vulcanization process were collected, and after being placed in the laboratory for 1 min, two gloves were started to be processed by the method of the present invention. Put one glove unfolded into a ziplock bag (a plastic bag with a sealed zipper, with good airtightness) and seal it; the other glove is completely wrapped and sealed with PE plastic wrap on the surface of the glove; the third glove sample does not do the aforementioned deal with. Spread the above three gloves together in a laboratory dark box (60cm*100cm*30cm), keep the temperature in the dark box at 25°C, and take them out after 3 days. Then, the ziplock bag and the plastic wrap were removed respectively to obtain 3 comparison samples. The 3 comparative samples were placed on the window sill with visible sunlight in the south for 3 months and then observed....

Embodiment 2

[0056] From the vulcanization workshop of natural latex gloves, a total of 3 samples of the same batch of natural latex gloves that had just completed the vulcanization treatment were collected, and after being placed in the laboratory for 1 min, two gloves were started to be processed by the method of the present invention. Put one glove unfolded into a ziplock bag (a plastic bag with a sealed zipper, with good airtightness) and seal it; the other glove is completely wrapped and sealed with PE cling film on the surface of the glove, and the third glove sample does not do the above deal with. Spread the above three gloves together in a laboratory dark box (60cm*100cm*30cm), keep the temperature in the dark box at 40°C, and take it out after 2 days. Then, the ziplock bag and the plastic wrap were removed respectively to obtain 3 glove samples to be tested. Total reflection infrared analysis scans were performed on the surfaces of these 3 glove samples. The result is as figu...

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Abstract

The invention relates to a method for preventing a natural latex product from blooming. The method comprises the steps of sealing the natural latex product, and placing and treating the natural latexproduct in a light-tight environment after the natural latex product is prepared. According to the method, water in a latex film of the natural latex product is kept, and the product is softer; and meanwhile, ingredients effectively and completely react, so that the performance (for example, water and oil prevention, wear resistance and ageing resistance) of the natural latex product is improved,the residual volume is reduced, and the problem of blooming is alleviated. Due to the alleviation for the blooming phenomenon and the more complete reaction for the ingredients, the latex film of thenatural latex product is more resistant to moisture and the invasion of external damage factors. After the treatment of the method, a layer of compact and stable hydrophobic film is generated on the surface of the latex film of a natural latex glove, and capable of preventing the migration of the ingredients in a latex surface of the natural latex product and blocking the entrance of the externaldamage factors, so that the latex film of the natural latex product forms a closed system, and then the purpose of preventing the blooming is achieved.

Description

technical field [0001] The invention relates to a latex product production process, in particular to a method for preventing natural latex products from blooming. Background technique [0002] Natural rubber latex is derived from the rubber tree in nature, which is composed of spherical particles with a particle size of 0.02-2 μm. Natural rubber latex has a lively structure and complex components. Natural rubber latex has a huge range of applications, but almost all natural rubber latex products produced by using natural latex have serious surface whitening phenomenon, that is, blooming phenomenon. The blooming phenomenon refers to the migration of some small molecular compounds (various compounding agents) in the latex formula, which are precipitated on the surface of latex products or semi-finished products, forming a layer of exudate similar to hoarfrost, which adheres to the surface of latex semi-finished products or vulcanized products. surface. This phenomenon serio...

Claims

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Application Information

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IPC IPC(8): B29C71/00
CPCB29C71/00
Inventor 周星余张建明黄莎莎黄文旭刘成顺孙永峰徐凯段咏欣
Owner SHANDONG XINGYU GLOVES
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