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1. Carboxy terminated nitrile rubber
(XNBR)
Presentation by
Primary Information Services
www.primaryinfo.com
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A
Literature
Survey

2. XNBR means Carboxylated Nitrile Rubber Read more at
http://acronymsandslang.com/definition/244206/XNBR-meaning.html

3. The invention relates to a preparation method of XNBR. The
XNBR prepared by the method provided by the invention has
a raw rubber bound acrylonitrile content of 26.0%-29.0%, a
Mooney viscosity of 40-60, a carboxyl content of 6.0%-7.0%,
and a gel content of less than 3.0%. Vulcanized rubber has
excellent wear resistance, ozone aging resistance,
adhesiveness and physical and mechanical properties, and
especially has particularly outstanding strength and
elongation performance under high temperature.

4. A preparation method of carboxy nitrile latex for making lining-free oil-proofing
industrial glove includes the folloiwng steps: adding desalted water 80-150
portions, emulsifier 2.5-4.0 portions, molecular weight regulator 0.7-1.5 portions,
pH buffering agent 0.1-0.6 portions, polymerization monomer butadiene 50-65
portions, acrylonitrile 35-45 portions, unsaturated carboxylic acid C 3-10 portions,
unsaturated carboxylic ester C 1-8 portions/vinyl carboxylic ester D 1-4 portions,
and finally adding initiating agent 0.1-1.0 portions, first stage the temp. is 20-30
deg.C; adding acrylointrile 0-10 portions, unsaturated acid C 1-2 portions,
unsaturated carboxylic ester C 0.5-1 portions, vinyl carboxylic ester 0.5-1 portions
and residue monomer to make continuous reaction, adding first emulsifier,
reducing agent additive liquor, making reaction for 12 hr., adding second and third
additive liquors, making reaction until the conversion rate is up to above 97% so as
to obtain the invented product. It can improve the flexibility of latex products.

5. A process has now been discovered that permits the
simultaneous crosslinking and derivatization of an, optionally
hydrogenated, polymer whose backbone is composed of a
conjugated diene, an unsaturated nitrile and an unsaturated
carboxylic acid in the presence of a coupling/condensing
agent.
This permits the preparation of a novel polymeric material
that is an optionally hydrogenated, polymer of a conjugated
diene, an unsaturated nitrile and a derivatized unsaturated
acid. It has also been found that this novel polymeric material
has unexpected and valuable properties.

6. Mechanical Properties of XNBR