To obtain a master batch of high content of synthetic fiber which can be added to cement or in the production of a variety of concrete materials and can be uniformly dispersed in a shortened time through simple mixing operations by admixing a composition to specific synthetic fiber, fibrillating and dispersing them.
As a reinforcing fiber in the master batch, a variety of organic synthetic fibers are used, which develop reinforcing effect, when they are formulated to a variety of materials, for example, cement formed products for building material or coating materials for buildings and building materials and have an average fiber length of 2-15mm, a thickness of 0.1-40 denier. The synthetic fiber is mixed with a betain type ampholytic surfactant to apply the surfactant to the fiber surface thereby improving dispersion of the fiber. The amount of the surfactant is 0.05-5wt.% based on the synthetic fiber on the solid basis. The treated synthetic fiber is combined with 20-200 pts.wt. of multibranched polyolefin short-cut fibers with an average fiber length of 0.1-1.0mm, prepared by drying and fibrillating polyolefin synthetic pulp into flap-like substance per 100 pts.wt. of the synthetic fiber and with 20-300 pts.wt. of an inorganic filler with an average particle size of ≤5μm and they are fibrillated and dispersed.
CHO KENTARO
FUJIWARA TSUNEO
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