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Composite fiber for inorganic binder applications

A fiber and two-component fiber technology, applied in the field of composite fibers for inorganic binder applications, can solve the problems of reduced fluidity and operability of mixtures, affecting rheological properties of inorganic binder mixtures, etc.

Active Publication Date: 2018-01-02
CONSTR RES & TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this also affects the rheology of the inorganic binder mixture
The fluidity and corresponding workability of the mixture decreases significantly with increasing fiber content or fiber length

Method used

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  • Composite fiber for inorganic binder applications
  • Composite fiber for inorganic binder applications
  • Composite fiber for inorganic binder applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A 40 micron thick PP sheet oxidized with a 5% potassium persulfate solution for 6 hours at 60°C was coated with a saturated aqueous solution of polyvinyl alcohol (eg Mowiol 4-88; Kuraray Ltd.) and dried at 70°C . After this step, the sheet is cut longitudinally into crimped or instant crimped fibers ( figure 2 ). After being placed in water for 30min-60min, the resulting annular fiber element is stretched or stretched ( image 3 ). When the amount of hydrophilic polymer solution was doubled, the thickness of the resulting layer on PP doubled, which resulted in a stronger curling effect and took longer (over 60 minutes) to stretch when placed in water.

Embodiment 2

[0051] A 100 micron thick PP sheet oxidized with a 5% potassium persulfate solution for 6 hours at 60°C was coated with a saturated aqueous solution of polyvinyl alcohol (e.g. Mowiol 4-88; Kuraray Ltd.) plus 10% barium sulfate powder. Cover and dry at 70 °C. After this step, the sheet is cut longitudinally into fibers that are immediately crimped. When these coiled, looped fibers are placed in water, they stretch, or stretch.

Embodiment 3

[0053] A 40 micron thick PP foil oxidized with a 5% potassium persulfate solution for 6 hours at 60°C is coated with a saturated aqueous solution of polyacrylic acid (eg Sokalan PA 40 or Sokalan CP 12S; BASF SE) and dried at 70°C . After this step, the sheet is cut longitudinally into fibers that are immediately crimped. When these looped fibers are placed in water, they stretch, or stretch, as described above.

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Abstract

Fibers of diverse materials find widespread use in inorganic binder compositions to improve the properties of the final cured composite materials. When using high amounts of fiber in inorganic binderslurries, problems arise due to the loss of workability because of unevenly distributed fiber content. The fibers according to the invention allow the use of large amounts of fiber without loss of workability and are particularily useful to control the rheology of the composite slurry mixtures. The fibers according to the invention are bicomponent fibers comprising a first hydrophobic polymer anda second hydrophilic polymer, and are obtained by: - uniaxially stretching a sheet of a first polymer; - oxidizing one side of a sheet of said first polymer; - coating the oxidized side of a sheet ofsaid first polymer with said second polymer; - drying the resulting bicomponent substrate; - cutting the dried bicomponent substrate into fibers of desired dimensions.

Description

technical field [0001] Fiber-containing composites have been widely used in, for example, coatings, floor coverings, tires, synthetic leather, and cementitious or inorganic binder composites for reinforcement, crack control, and shrinkage reduction. The handling of such fibrous products is often difficult when staple fibers or staple fiber bundles or fiber filaments generally having different lengths are used or have to be metered in and mixed into the composite mixture. Fibers have the property of assembling into fiber balls, fiber clusters or fiber nests, so they generally exhibit low dispersion in mixtures. Especially when applying small filaments such as microfibers, the corresponding dispersion of the fibers in the inorganic binder slurry is challenging. This problem is most pronounced with short polymeric fibers of commercial interest due to better durability than steel fibers. [0002] Chopped fibers are used in various applications such as textiles, nonwovens, carpet...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B28/02C04B28/14C04B16/06D01D5/42D01D5/22D01D5/32D01F8/06D01F8/10
CPCC04B20/0068D01D5/22D01D5/32D01F8/00D01F8/06C04B28/006C04B28/02C04B28/14C04B16/0633C04B16/0641D01D5/426Y02P40/10C04B20/068
Inventor B·沃尔瑟B·费希特恩施拉格尔
Owner CONSTR RES & TECH GMBH
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