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Phenol formaldehyde-rubber copolymerized emulsion and its preparation method

A rubber copolymerization and emulsion technology, applied in textiles, papermaking, fiber processing, etc., can solve the problems of short storage time of latex, enhanced bending fatigue performance of rubber products, RF resin reaction, etc., to increase the safety and operability of use, The effect of improving static and dynamic fatigue performance, improving bending fatigue performance

Inactive Publication Date: 2009-06-17
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The pot life of the RF resin obtained through the above reaction is very short, and the latex must be added immediately after the reaction, otherwise it will cause further reaction of the RF resin
[0005] The latex synthesized by the above reaction can be used for fiber impregnation after 18 hours of aging, but there is a problem of short storage time of latex, generally only 48 hours of storage time can be guaranteed, otherwise it will affect the effect of fiber treatment. When R / F is 1 / 1-1 / 3, although the storage time can be appropriately increased, the film obtained on the surface of glass fiber and organic fiber is brittle, which cannot meet the needs of enhancing the fatigue resistance of rubber products
Increasing the amount of formaldehyde can improve the mechanical properties of the RFL film, but it may cause the impregnation effect to deteriorate, especially for glass fibers, which will affect the impregnation effect between fiber bundles, resulting in a decrease in the adhesion with rubber and affecting the reinforcement of rubber products. Poor bending fatigue performance, reducing service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1, phenolic-rubber copolymer emulsion is made by following dry weight (gram) proportioning raw material:

[0030] (1), from resorcinol formaldehyde resin: mixed latex (mixture of butylpyridine latex and chloroprene latex): formaldehyde = 10: 100: 1.2

[0031] Among them, butylpyridine latex: neoprene latex = 6: 2 or

[0032] (2), by resorcinol formaldehyde resin: mixed latex (butadiene latex, chloroprene latex, the mixture of carboxyl styrene-butadiene latex and acrylate latex): formaldehyde=10:100:0.8, wherein butylpyramid latex: chloroprene Latex: carboxylated styrene-butadiene latex: acrylate latex = 5:3:1:1, or

[0033] (3), by resorcinol formaldehyde resin: mixed latex (by the mixture of butylpyrrolate latex, chloroprene latex, carboxyl styrene-butadiene latex and natural rubber latex): formaldehyde donor=15:100:1.2,

[0034] Among them, butylpyridine latex: neoprene latex: carboxylated styrene-butadiene latex: natural rubber latex = 5:3:1:1.

Embodiment 2

[0035] Embodiment 2, a kind of preparation method of phenolic-rubber copolymer emulsion, concrete preparation steps are as follows:

[0036] The first step: in a reactor placed in a constant temperature water bath, weigh 6.7 grams of resorcinol and place it in the reactor, fully dissolve it with 87.1 grams of soft water, then add 0.27 grams of sodium hydroxide, and stir well Simultaneously, add dropwise 3.5 grams of 37% formaldehyde solution in the ratio of 1 / 0.7 by resorcinol / formaldehyde (R / F) molar ratio, control the concentration of RF resin at 8%, control reaction temperature at 25 ± 1 ℃, pass acidity Meter controls the final pH value of the RF resin to reduce the value to 0.4, and the reaction time is about 6 hours to obtain 100 grams of precondensed resorcinol formaldehyde resin;

[0037]Step 2: According to the ratio of 5:4:1, weigh the butylpyrrolate latex, chloroprene latex, and carboxylated styrene-butadiene latex respectively. After diluting the latex with 20%-50% ...

Embodiment 3

[0040] Weigh 5.8 grams of resorcinol and put it into a reaction vessel, dissolve it with 86.3 grams of soft water, add 0.2 grams of NaOH, mix it evenly, then weigh 3.9 grams of 37% formaldehyde and add it to a reaction vessel in a 35°C water bath After stirring evenly, when the pH value decreased to 1.0, 100 grams of resorcinol formaldehyde resin was obtained. According to the ratio of RF / L=10 / 100, this resorcinol formaldehyde resin is added to the latex mixed with butylpyridine latex, chloroprene latex, and carboxylated styrene-butadiene latex at a dry rubber weight ratio of 6:4:0 to carry out The copolymerization reaction is 20 hours, and the storage time of the prepared RFL emulsion is generally more than 96 hours. Add 1.2 grams of 37% before use. At this time, the RFL film has a certain toughness. Use it to treat glass fibers, and the monofilament isolation of glass fibers Good, the mechanical properties of glass fiber rope are high, but the adhesion and performance after ...

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Abstract

The present invention discloses a phenolic aldehyde-rubber copolymer emulsion and its preparation method. Said emulsion is made up by using resorcinol formaldehyde (RF) resin and one or several kinds of butadiene-vinylpyridine latex and / or neoprene latex, carboxy styrene-butadiene latex, acrylate latex, natural rubber latex, chlorosulfonated polyethylene latex and hydrobutadiene-acrylonitrile latex, making them undergo the process of copolymerization and adding formaldehyde. Said invention also provides the concrete steps of its preparation method.

Description

1. Technical field [0001] The invention relates to a chemical surface treatment agent, in particular to a surface treatment agent phenolic-rubber copolymer emulsion for reinforcing rubber fibers and a preparation method thereof 2. Background technology: [0002] In the known literature, the R / F molar ratio of resorcinol and formaldehyde is between 1 / 1-1 / 3 under the condition of base catalysis, (TREATING AGENT FOR GLASS FIBER AND TREATING AGENT COATED GLASS FIBER CORDJP2003081662; Glass fiber cord for reinforcing a rubber EP0931774), synthetic RF resin is synthesized, in the document Treating agent, cord for rubber reinforcement, and rubber product, the R / F molar ratio range is limited to 1 / 0.5-1 / 3, after the reaction is completed , directly added into the rubber latex under the condition of stirring, after a certain aging time, it is formulated into a fiber surface treatment liquid, which is directly used for fiber impregnation. The rubber latex used can be butylpyrrolate l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G8/28C08G81/00D06M15/41C03C25/00
Inventor 申明霞
Owner HOHAI UNIV
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