Synthetic rubber latex and method for manufacturing same
A technology for synthesizing rubber and latex, applied in chemical instruments and methods, emulsification, adhesives, etc., can solve the problems of decreased production efficiency, low storage stability of latex, insufficient mechanical stability of latex, etc., and achieve tensile strength and elongation. Excellent effect with excellent mechanical stability
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[0095] The method for preparing the latex composition of the present invention is not particularly limited, and examples thereof include mixing a vulcanizing agent and / or a vulcanization accelerator and, if necessary, mixing a vulcanizing agent and / or a vulcanization accelerator with a synthetic rubber latex using a disperser such as a ball mill, a kneader, or a disper. A compounding method; a method of mixing the aqueous dispersion into a synthetic rubber latex after preparing an aqueous dispersion of compounding components other than the latex of synthetic rubber using such a disperser.
[0096] The latex composition of the present invention preferably has a pH of 7 or more, more preferably has a pH in the range of 7-13, and still more preferably has a pH in the range of 8-12. In addition, the solid content concentration of the latex composition is preferably in the range of 15 to 65% by weight.
[0097] The latex composition of the present invention is preferably aged (pre-...
Embodiment 1
[0143] (Manufacture of synthetic polyisoprene latex (f-1))
[0144] Synthetic polyisoprene with a weight average molecular weight of 1,300,000 (trade name "NIPOL IR2200L", manufactured by Nippon Zeon Co., Ltd., a homopolymer of isoprene obtained by using a Ziegler-based polymerization catalyst, combined in cis The unit amount is 98% by weight) was mixed with cyclohexane, stirred, and dissolved by heating up to 60° C. to prepare a cyclohexane solution (a) for synthesizing polyisoprene.
[0145] On the other hand, 10 parts of sodium abietate and 5 parts of sodium dodecylbenzenesulfonate were mixed with water to prepare a mixture containing sodium abietate / sodium dodecylbenzenesulfonate = 2 / 1 by weight ratio. Surfactant aqueous solution (b) with a concentration of 1.5% by weight of the mixture at a temperature of 60°C.
[0146] Next, using the above-mentioned cyclohexane solution (a) and the above-mentioned anionic surfactant aqueous solution (b), by figure 1The manufacturing d...
Embodiment 2
[0157] (Manufacture of synthetic polyisoprene latex (f-2))
[0158] With the second dispersion energy F in the second dispersion process 2 for F 2 =5.26×10 7 In this way, the time for processing a volume twice the volume of the coarsely dispersed emulsion (c-1) in the rotor-stator type emulsifier 20 is the processing time (that is, the second dispersion processing of 2 cycles), and continuous Except having performed the 2nd dispersion process, it carried out similarly to Example 1, the synthetic polyisoprene latex (f-2) was manufactured, and it evaluated similarly. The results are shown in Table 1. That is, in Example 2, the total dispersion energy F total for F total =1.38×10 8 (F 1 +F 2 =8.53×10 7 +5.26×10 7 ) conditions to perform the first dispersion treatment and the second dispersion treatment.
[0159] (Preparation of latex composition, production of dipped molding)
[0160] Except having used the synthetic polyisoprene latex (f-2) obtained above, it carried...
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