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Polyolefin granulation method, polyolefin resin, polyolefin fiber, use of polyolefin fiber and cementitious compound

A polyolefin resin, polyolefin fiber technology, applied in the field of adding non-ionic and/or ionic surfactants, can solve the problems of complex cost, leaching loss, easy leaching, etc., and achieve excellent mechanical properties, Great adhesion, good dispersion effect

Inactive Publication Date: 2019-01-18
BRASKEM SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, said solutions are highly complex and their high cost makes them industrially impractical
[0014] Usually, the addition of modifiers only during the spinning step of polypropylene fibers (which is carried out in aqueous media) can lead to leaching loss or foaming, since the surfactants do not show good adhesion to the fibers , leading to easy leaching

Method used

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  • Polyolefin granulation method, polyolefin resin, polyolefin fiber, use of polyolefin fiber and cementitious compound
  • Polyolefin granulation method, polyolefin resin, polyolefin fiber, use of polyolefin fiber and cementitious compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Embodiment 1: use following material in the preparation of described composition:

[0053] • Polypropylene: Homopolymer with a melt flow index of 18 g / 10 min.

[0054] Surfactant 1: ratio 3EO / 6PO, viscosity 45 cP (25 °C) and density 0.96 g / cm 3 (25 °C) lauryl alcohol copolymer.

[0055] Table 1 shows the mass percent of surfactant added to the polypropylene during the granulation step.

[0056] Table 1

[0057] .

[0058] The pellets thus obtained were processed in a multifilament extruder to obtain polypropylene fibers, which were characterized by pull-out tests, atomic force microscopy (AFM) and mechanical properties such as tenacity and elongation fiber. The techniques used for characterization are listed below:

[0059] ● Pull-out test: The adhesion of fibers to cementitious substrates was evaluated by a laboratory test in which the filaments were embedded to a length of 0.5 mm-2 mm in a formulation simulating a mixture containing cement, filler, sand, Comp...

Embodiment 2

[0063] Compared to Example 1, Example 2 shows the effect of Surfactant 1 on the mechanical properties of the fibers and its performance in tests to evaluate the adhesion to cementitious composites.

[0064] Table 2

[0065] Example

Toughness (cN / dtex)

Elongation (%)

DG (J / m 2 )

t (MPa)

1

6.40 ± 0.05

26.3 ± 0.9

0-0.5

1.01

2

5.40 ± 0.16

24.6 ± 0.8

4.3

0.81

[0066] The results in Table 2 show that mechanical properties such as toughness, elongation and friction (τ) are slightly affected by the presence of nonionic surfactants, but do not impair their performance. A significant increase in binding energy (DG) was observed, similar to the properties observed for PVA fibers. These properties make the new material of industrial interest thanks to the improved performance of the fibers as reinforcements for composites.

[0067] Thus, the significant increase in the binding energy (DG) as shown in Table 2, accounts...

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Abstract

The present invention relates to a method for producing polyolefin with enhanced polar character by incorporation of surfactants in order to provide polymer resins used for the production of fibres with improved performance that can be used as reinforcing agents in cement composites. More specifically, the polyolefin obtained by polymerization is modified by incorporation of surfactants during the granulation process. Also described is a polymer resin of improved polarity consisting of a polyethylene homopolymer or a polypropylene homopolymer, copolymer or terpolymer, or a blend of two or more of these components, and at least one non-ionic and / or ionic surfactant having a partially polar structure for preparing reinforcing fibres for use in cement composites for manufacturing structural and non-structural components in the field of civil engineering, such as bridge girders, slabs, pavements, large concrete containers, sealing panels, high-performance tiles, inter alia.

Description

[0001] The present invention relates to a process for the preparation of polyolefins such as polyethylene, polypropylene, or ethylene-propylene copolymers or ethylene-propylene-butene terpolymers or comprising two or more of said components Sphalerite (sphalerite), said polyolefin has improved polar properties resulting from the incorporation of additives to obtain polymer resins whose fibers when functioning as reinforcing agents in cementitious composites provide high performance. More specifically, the polyolefins obtained via polymerization are modified by incorporating surfactants into the granulation process. Background technique [0002] The building construction market has grown significantly over the past decade, mainly due to better quality of life noted in developing countries. In addition, worldwide housing projects, urban transport and social events also contribute to the development of this segment. The need for materials meeting said part of the requirements t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/12C08J3/20C08K5/10C08K5/17D01F1/10C04B16/06
CPCC08J3/203C04B16/0625C04B16/0633C04B28/02C08J2323/10C08K5/06C08K5/19C08L23/04C08L23/06C08L23/10C08L23/12C08L2205/02C08L2205/025C08L2205/16D01F1/09C08L23/02C08L71/02
Inventor M.A.索托奧维伊多C.d.勒莫斯F.皮雷斯德卡瓦霍
Owner BRASKEM SA
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