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Preparation method of butyronitrile latex with high nitrile group content

A technology of nitrile rubber and high content, which is applied in the preparation of nitrile latex, the preparation of high nitrile content nitrile latex, and the manufacture of asbestos or non-asbestos sheet. Low nitrile content and other problems, to achieve the effect of reducing the amount of recycled monomers, wide application range, and increasing the content of combined acrylonitrile

Active Publication Date: 2010-02-17
SINOPEC LANZHOU GASOLINEEUM CHEM IND CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the nitrile latex used in the non-asbestos sheet industry has a low bound acrylonitrile content.
Taking the commonly used nitrile 26 latex as an example, its combined acrylonitrile content is only about 20%, its low temperature resistance is -30°C, and its high temperature resistance is 180°C, which cannot meet these requirements.
In addition, due to the low surface tension of nitrile latex, the wettability with asbestos fibers is not good, and some flocculation will occur during the beating process. , especially for the adsorption of non-asbestos fibers, nitrile latex and styrene-butadiene latex are more difficult to adsorb, resulting in shutdown and continuous production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment one: the production of nitrile latex

[0036] 1. Formula: in parts by mass

[0037] Monomer: 70 parts of butadiene, 30 parts of acrylonitrile;

[0038] Oxidizing agent: 1.2 parts of potassium persulfate;

[0039] Emulsifier: sodium lauryl sulfate: 1.8 parts, nonphenolyl polyoxyethylene ether TX-12: 0.8 parts, β-naphthalenesulfonate sodium formaldehyde condensate: 0.3 parts;

[0040] Reducing agent (molecular weight regulator): n-dodecyl mercaptan, 1.4 parts;

[0041] Auxiliary agent: Potassium hydroxide: 0.05 part;

[0042] pH buffer: sodium bicarbonate; 0.43 parts;

[0043] Electrolyte: 0.4 parts of potassium phosphate;

[0044] Chelating agent: 0.3 parts of tetrasodium ethylenediaminetetraacetic acid (hereinafter referred to as tetrasodium EDTA);

[0045] Co-reducing agent: sodium bisulfite, 0.1 part;

[0046] Soft water: 120 parts.

[0047] 2. Process:

[0048] (1) One-stage feeding: in a 10L polymerization kettle with stirring, nitrogen inlet and...

Embodiment 2

[0056] Embodiment two, the production of nitrile latex

[0057] 1. Formula: in parts by mass;

[0058] Monomer: 65 parts of butadiene, 35 parts of acrylonitrile;

[0059] Initiator: 1.3 parts of potassium persulfate;

[0060] Emulsifier: sodium lauryl sulfate: 1.6 parts, nonphenolyl polyoxyethylene ether TX-12: 1.0 parts, β-naphthalenesulfonate sodium formaldehyde condensate: 0.3 parts;

[0061] Molecular weight regulator: 1.5 parts of tertiary dodecyl mercaptan;

[0062] Auxiliary agent: 0.08 parts of sodium hydroxide;

[0063] pH buffer: 0.45 parts of sodium carbonate;

[0064] Electrolyte: potassium chloride, 0.35 parts;

[0065] Chelating agent: disodium edetate (hereinafter referred to as disodium EDTA), 0.32 parts;

[0066] Co-reducing agent: sodium bisulfite, 0.2 parts

[0067] Soft water: 125 parts

[0068] 2. Process:

[0069] (1) One-stage feeding: in a 10L polymerization kettle with stirring, nitrogen inlet and outlet, material inlet and outlet, temperature...

Embodiment 3

[0077] Embodiment three, the production of nitrile latex

[0078] 1. Formula: in parts by mass;

[0079] Monomer: 60 parts of butadiene, 40 parts of acrylonitrile;

[0080] Initiator: 1.3 parts of potassium persulfate;

[0081] Emulsifier: 1.6 parts of sodium lauryl sulfate, 1.0 parts of nonylphenol polyoxyethylene ether TX-12, 0.3 parts of β-naphthalenesulfonate sodium formaldehyde condensate;

[0082] Molecular weight regulator: tertiary dodecyl mercaptan, 1.5 parts;

[0083] Auxiliary agent: 0.09 parts of sodium hydroxide;

[0084] pH buffer: 0.47 parts of sodium bicarbonate;

[0085] Electrolyte: 0.40 parts of potassium chloride;

[0086] Chelating agent: disodium edetate (hereinafter referred to as disodium EDTA), 0.38 parts;

[0087] Co-reducing agent: sodium bisulfite, 0.22 parts

[0088] Soft water: 130 parts

[0089] 2. Process:

[0090] (1) One-stage feeding: in a 10L polymerization kettle with stirring, nitrogen inlet and outlet, material inlet and outlet, ...

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Abstract

The invention provides butyronitrile latex with high nitrile group content for manufacturing asbestos or a non-asbestus sheet. The butyronitrile latex is prepared by taking butadiene and acrylonitrileas monomers and adopting a compound emulsifying system formed by an anionic emulsifier and a non-ionic emulsifier and a redox initiation system formed by persulfate and mercaptan. An intermediate-temperate emulsion polymerization technology of a three-stage stepped temperature control process that the monomers, an emulsifying agent, an initiating agent, a reducing agent, an auxiliary reducing agent, and the like are added in batches is adopted so as to ensure that the polymerization stability of the latex is greatly improved, prevent the generation of gel and improve the mechanical stabilityof the latex. The content of the acrylonitrile combined by the latex is 28-33 percent, and the strength in each aspect of the nitrile latex exceeds the strength of the prior nitrile latex product. Particularly, the butyronitrile latex has good oil resistivity and low loss ratio in a solvent, thus the nitrile latex has excellent performance when used for manufacturing the asbestos or the non-asbestes sheet.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and relates to a method for preparing nitrile latex, in particular to a method for preparing nitrile latex with high nitrile group content, which is mainly used for manufacturing asbestos or non-asbestos sheet. Background technique [0002] Asbestos or non-asbestos latex sheet is made of asbestos-free inorganic or organic synthetic fibers and latex compounding agent as the main raw material. It is a sealing material made of beating, sheeting, and vulcanization. It is mainly used for internal combustion engine cylinder sealing gaskets. Static gaskets for substrates and other mechanical devices. The latexes involved in the manufacture of asbestos or non-asbestos sheets mainly include nitrile latex, styrene-butadiene emulsion, acrylate emulsion, etc. Among them, nitrile latex is favored for its excellent elasticity and oil resistance, and is the most widely used. [0003] With the continu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F236/12C08F2/30C08F2/26C08L9/04C08K13/04C08K7/12C08K7/14
Inventor 俞燕龙杨帆陈世龙李斌张英杰
Owner SINOPEC LANZHOU GASOLINEEUM CHEM IND CORP
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