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Method for preparing high performance carboxylic acrylonitrile butadiene rubber latexes

A carboxylated nitrile latex, a high-performance technology, applied in the field of emulsion polymerization in polymer materials, can solve problems such as insufficient odor, and achieve the effects of good fluidity, moderate viscosity, and improved bond strength

Inactive Publication Date: 2016-01-13
杭州蓝励新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the carboxylated nitrile latex produced by domestic manufacturers is only supplied to the low-end market due to obvious deficiencies in stability, adhesion, and odor.

Method used

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  • Method for preparing high performance carboxylic acrylonitrile butadiene rubber latexes
  • Method for preparing high performance carboxylic acrylonitrile butadiene rubber latexes
  • Method for preparing high performance carboxylic acrylonitrile butadiene rubber latexes

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0035] Preparation of seed latex

[0036] Seed Latex A: The 500L polymerization kettle is evacuated first, and the vacuum degree reaches -0.1MPa, and the material is fed according to the following formula:

[0037]

[0038]

[0039] Raise the temperature to 52°C, react for 12 hours, the conversion rate is 98%, cool down and discharge to obtain seed latex A with a solid content of 28.2%, a particle size of 43nm, and an aggregate of less than 0.05%.

[0040] Seed Latex B: The 500L polymerization kettle is evacuated first, and the vacuum degree reaches -0.1MPa, and the material is fed according to the following formula:

[0041]

[0042] Raise the temperature to 48°C, react for 14 hours, the conversion rate is 99%, cool down and discharge to obtain seed latex B, with a solid content of 26.1%, a particle size of 48nm, and an aggregate of less than 0.01%.

[0043] Seed Latex C: The 500L polymerization kettle is evacuated first, and the vacuum degree reaches -0.1MPa, and t...

Embodiment 1

[0048] Example 1: The 300L polymerization kettle is first evacuated, and the vacuum reaches -0.1MPa, and then 119KG of soft water, seed latex A10KG, acrylonitrile 20KG, butadiene 50KG, methacrylic acid 1KG, sodium vinylsulfonate 1KG, ten Sodium dialkylsulfate 1KG, divinylbenzene 0.5KG, initiator 0.4KG, a small amount of electrolyte, chelating agent, pH buffer, heat up, and emulsify the following components by ultrasonic or homogenizer to obtain a stable fine emulsion :

[0049]

[0050] When the temperature reaches 50°C, add the components of the above mini-emulsion dropwise at the same time for 2.5 hours, and control the temperature at about 50°C during the dropwise addition. Insulate and react for 3 hours, when the conversion rate reaches more than 99%, degassing treatment is carried out to remove unreacted monomers, adding lye to adjust the pH value to between 7 and 8, cooling down and discharging the material for packaging, and a kind of High-performance carboxylated n...

Embodiment 2

[0051] Example 2: The 300L polymerization kettle is first evacuated, and the vacuum reaches -0.1MPa, and then 115KG of soft water, seed latex B12KG, acrylonitrile 18KG, butadiene 52KG, methacrylic acid 1KG, sodium vinylsulfonate 0.5KG, Sodium lauryl sulfate 1KG, divinylbenzene 1KG, initiator 0.4KG, a small amount of electrolyte, chelating agent, PH buffering agent, heat up, and emulsify the following components by ultrasonic or homogenizer to obtain a stable fine emulsion :

[0052]

[0053]

[0054] When the temperature reaches 50°C, add the components of the above mini-emulsion dropwise at the same time for 3 hours, and control the temperature at about 55°C during the dropwise addition. Insulate and react for 3 hours, when the conversion rate reaches more than 99%, degassing treatment is carried out to remove unreacted monomers, adding lye to adjust the pH value to between 7 and 8, cooling down and discharging the material for packaging, and a kind of High-performance...

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Abstract

The invnetino discloses a method for preparing high performance carboxylic acrylonitrile butadiene rubber latexes. The carboxylic acrylonitrile butadiene rubber latexes use an emulsion polymerization process which uses styrene-butadiene latexes as seeds, are dropped with a part of monomers, use butadiene and acrylonitrile as main monomers, use unsaturated carboxylate and are assisted by multi-functional monomers such as multiple double bond crosslinking monomers, and use a complex emulsifier system which is reactive emulsifiers and less anionic emulsifiers when polymerizing, wherein persulfate is an initiator, alkyl sulfhydryl is a molecular weight regulator and other assistants, the reaction temperature is 40-60 DEG C, and the conversion rate is above 98%. Raw materials which are dropped during the production process of the high performance carboxylic acrylonitrile butadiene rubber latexes are dispersed by adopting an ultrasonic homogenizer or a high pressure homogenizer, thereby forming 50-500nm steady miniemulsion, and then being dropped into a reaction kettle. The carboxylic acrylonitrile butadiene rubber latexes which is prepared through the method for preparing the high performance carboxylic acrylonitrile butadiene rubber latexes is 100-120nm in particle size, is excellent in mobility, moderate in viscosity, excellent in mechanical stability and chemical stability, greatly improves toughness and bonding strength, and is particularly suitable to soak gloves, surgical gloves and wear-resistant materials and the like.

Description

technical field [0001] The invention relates to a method for preparing high-performance carboxylated nitrile latex, which is suitable for dipping gloves, oil-resistant gloves and a method for making carboxylated nitrile latex for wear-resistant materials, and belongs to the technical field of emulsion polymerization in polymer materials. Background technique [0002] In the 1930s, natural rubber latex began to be used in the dipping industry to manufacture various dipped products, such as gloves and balloons. Due to the poor oil resistance of natural rubber latex, it cannot meet the physical requirements of oil-resistant products such as gloves; in the early 1950s, nitrile latex was widely used in the production of dipped gloves, and nitrile latex has the following properties: the film has excellent oil resistance and solvent resistance , Resistance to chemical corrosion and abrasion, and has strong wettability and adhesion to fibers, leather, asbestos, etc. However, nitril...

Claims

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Application Information

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IPC IPC(8): C08F236/12C08F236/10C08F236/06C08F220/46C08F212/08C08F220/06C08F222/02C08F2/26
Inventor 周兆丰邱伟群谢素华龙绪俭
Owner 杭州蓝励新材料有限公司
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