JPH04247151A - Textile geogrid - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water absorption-preventing textile geogrid with improved alkali resistance, which is used by being buried in concrete or alkaline ground.

0002

[Prior Art] Conventionally, lattice-shaped sheets, so-called geogrids, used in civil engineering work have been made of plastic lattice-shaped sheets and textile geogrids made by impregnating polyvinyl chloride resin with synthetic fiber mesh knitted fabrics. It is used. For example, a lattice-like sheet for civil engineering is made by impregnating and coating a lattice-like fiber sheet made of synthetic filament yarn with polyvinyl chloride resin, etc.
This method has been proposed in Publication No. 030, Japanese Utility Model Application Publication No. 2-125038, etc.

0003

[Problems to be Solved by the Invention] Conventional lattice sheets made by weaving and weaving synthetic fibers and impregnating them with vinyl chloride resin, etc., tend to have water in the fiber bundles over a long period of time. As a result of this penetration, not only the alkali in the concrete but also various substances dissolved in the water cause and accelerate the deterioration of the fibers, resulting in unfavorable conditions.

The object of the present invention is to provide a textile geogrid which is suitable for use by being embedded in concrete and has water absorption prevention properties and improved alkali resistance.

[0005]

[Means for Solving the Problems] The present invention is a textile geogrid in which a resin is applied to a lattice-like fiber sheet made of synthetic fibers to which a water repellent is attached.

[0006] The present invention also provides a water repellent obtained by treating synthetic fibers with a water repellent selected from the group consisting of fluorine-based water repellents and silicone-based water repellents, and optionally heat-treating the synthetic fibers. When a bundle of attached fibers is placed upright in a 5% red ink aqueous solution for 24 hours, the red ink aqueous solution will be sucked up to a height of 20 m.
This is a method for producing a textile geogrid, which is characterized in that water-repellent synthetic fibers with a diameter of 50 m or less are knitted into a lattice-like fiber sheet, and then impregnated and coated with an alkali-resistant resin.

The synthetic fibers used in the present invention include, for example, polyvinyl alcohol fibers, meta- and para-aramid fibers, polyamide fibers, wholly aromatic polyester fibers, polyester fibers, acrylic fibers, carbon fibers, and fluorine fibers. , glass fiber, etc. Preferably, the fiber has a softening point or melting point of 200° C. or higher, a cutting strength of 7 g/denier or higher, and a cutting elongation of 2% or higher. The synthetic fiber is knitted or woven using multifilament yarn or spun yarn, and it is preferable to use multifilament yarn with a total fineness of 1,000 to 100,000 deniers.

[0008] In addition, water-repellent treatment of synthetic fibers involves treating synthetic fibers in the form of tows or multifilament threads, or lattice-like fiber sheets made by knitting and weaving these fibers, with a water-repellent agent selected from fluorine-based water repellents and silicone-based water repellents. Treat with aqueous dispersion or solution, dry, and if necessary
The water repellent is fixed by heat treatment at 0°C. The water repellency of synthetic fibers is determined by the height at which the red ink solution is sucked up when a bundle of synthetic fibers treated with a water repellent is placed upright in a 5% red ink aqueous solution for 24 hours at room temperature. Cut the bundle 5 mm apart from the liquid level in which the bundle was immersed, and judge the height until the part that is not stained with red ink appears. The water repellency of the water-repellent synthetic fiber used in the present invention is such that the red ink wicking height is 20 mm or less, more preferably 5 mm or less. Usually, a water repellency of 20 mm or less can be achieved by adjusting the amount of water repellent applied to the fiber to be 0.1 to 5% by weight.

Next, methods for weaving and weaving water-repellent synthetic fibers into lattice-like fiber sheets include, for example, plain weaving, triaxial weaving, quadriaxial weaving, leno weaving, leno weaving, Raschel knitting, and warp/weft insertion warp weaving. It can be easily manufactured by knitting. Also,
The size and shape of the lattice openings of the fiber sheet are appropriately determined depending on the intended use, but usually the lattice opening of the resin-processed lattice sheet is 3 to 120 mm.

[0010] The resin applied to the lattice fiber sheet may include vinyl chloride resin, epoxy resin, vinyl acetate resin,
One or more resins selected from acrylic acid and/or acrylic ester resins. Resin processing is a resin composition in which fillers, colorants, stabilizers, etc. are added as necessary to a resin dispersion or solution, a resin initial condensation polymer, a resin composition made into a paste with a plasticizer, etc. After adjusting the material and applying the resin by dipping the lattice fiber sheet in the resin composition or applying the resin composition, remove the excess resin composition, dry it, and apply the resin composition as necessary. Temperature 130-180℃, time 0.5
This is achieved by heat treatment for ~10 minutes. The amount of resin attached to the lattice fiber sheet is preferably 0.8/1 to 2/1 in terms of weight ratio. Outside this range, a sufficient fixing effect may not be obtained or the strength per unit cross-sectional area may be insufficient.

The textile geogrid of the present invention comprises 1
It has high strength that can withstand loads of ,000 kg/m or more, has little deformation, and can prevent water from entering the fiber bundle for a long period of time. In particular, it is an excellent product that can prevent deterioration caused by alkali and mold, and can be used buried in concrete, or laid or stretched in areas where concrete is poured during civil engineering and construction work. suitable for

0012

[Function] The present invention is made by processing a lattice fiber sheet made of synthetic fibers with high water repellency into a resin.
It is possible to prevent water from entering or spreading into the fiber bundle of the sheet, and as a result, deterioration of the fibers due to alkali or the like dissolved in the water can be prevented.

[0013]

[Examples] Next, the present invention will be explained with examples. In addition, parts and percentages in the examples refer to weight unless otherwise specified.

Examples 1 to 4, Comparative Examples 1 to 3 Cutting strength 17
g/dr, polyvinyl alcohol fiber with an elongation of 8.5% and a fluorine-based water repellent [Product name: Asahi Guard AG-73]
0 (manufactured by Asahi Glass Co., Ltd.)] in various concentrations of water emulsion, squeezed to a coating rate of about 60%, dried, and dried at a temperature of 1.
A water-repellent polyvinyl alcohol fiber was obtained by heat treatment at 80° C. for 30 seconds.

[0015] Water-repellent polyvinyl alcohol fibers are made of 6 multifilament yarns of 1800 dr/1000 fil/1 for the warp and 1800 dr/1000 for the weft.
Using two twisted fil/3 multifilament yarns, Raschel knitting, opening 20mm, fabric width 214cm
A lattice fiber sheet was made. A resin composition mainly composed of vinyl chloride resin paste containing 50 PHR of plasticizer was roll applied to the lattice fiber sheet at 100%.
A solid resin composition was applied and gelled with hot air at 180°C to obtain a textile geogrid (lattice sheet). A part of this textile geogrid is 10cm wide,
A test piece was cut to a length of 100 cm, leaving one cut in the length direction and sealing the other cut with molten polyethylene.
A water penetration acceleration test was conducted by immersing the sample in a 5% red ink aqueous solution containing 2% caustic soda at a temperature of 50° C. for 30 days. The results are shown in Table 1 together with the water repellency of the fibers.

[0016]

[Table 1]

In other words, the textile geogrid of the example has good bonding properties between the fiber bundle and the impregnated resin coating, and is a product with excellent water repellency, whereas Comparative Examples 1 and 2 have poor water repellency and the fiber Water has entered the inside of the bundle. This also becomes a factor that induces fiber deterioration. On the other hand, if the water repellency is strengthened, water will not penetrate into the fiber bundle, but the adhesiveness between the fiber bundle and the impregnated resin coating will be poor, and the fixation of the lattice-like fiber sheet by the resin will be poor.

Example 5 A fully aromatic polyester fiber with a cutting strength of 25.7 g/dr and an elongation of 3.5% [trade name Vectran (Kuraray product)] was treated with a fluorine-based water repellent [trade name Asahi Guard AG-730].
(Asahi Glass Co., Ltd. product)] was immersed in a water emulsion solution with a concentration of 1%, squeezed until the adhesion rate was approximately 60%, dried, and dried at a temperature of 18%.
A heat treatment was performed at 0° C. for 30 seconds to obtain a wholly aromatic polyester fiber having a water repellency of 0 mm in height from which the aqueous red ink solution was sucked.

[0019] Water-repellent wholly aromatic polyester fibers are made of 6 plied and twisted multifilament yarns of 1000 dr/200 fil/2 for the warp and 1000 dr/200 fil for the weft.
/2/3 multifilament yarn using two twisted yarns,
A lattice fiber sheet with an opening of 20 mm and a knitted fabric width of 214 cm was made using Raschel knitting. A resin composition consisting of 70 parts of a vinyl chloride resin paste containing 60 PHR of a plasticizer and 30 parts of an epoxy resin composition was applied to the lattice-shaped fiber sheet so that the resin composition was 100% solid. gelatinized with hot air at a temperature of 180°C.
A textile geogrid was obtained by heat treatment for 2 minutes and curing. A portion of this textile geogrid with a width of 1
0cm, cut to length 100cm, cutting edge 1 in the length direction.
A test piece with all but one cut end sealed with molten polyethylene was immersed in a 5% aqueous red ink solution containing 2% caustic soda at a temperature of 50°C for 30 days to conduct a water penetration acceleration test. . As a result, the penetration of water into the fiber bundle was 10 mm or less. Furthermore, we made a concrete plate with this textile geogrid inserted in the middle and a concrete plate with reinforcing bars for comparison, and left them in a 10% saline solution at a temperature of 50℃ for 5 days. The durability of the concrete plate with textile geogrid and the concrete plate with reinforcing steel was investigated by repeatedly conducting a durability test of leaving it in warm air for 5 days. As a result, the thickness of reinforced concrete plates increases as the reinforcing bars rust,
Eventually, cracks appeared in the concrete. However, at that time, no abnormalities were observed in the concrete plate containing the textile geogrid.

[0020] This textile geogrid is strong
It has a weight capacity of 2 tons/m or more, has excellent flexibility, and is suitable for being stretched over the concrete surface of slope construction and finished by spraying concrete.

[0021]

Effects of the Invention: The present invention has been able to prevent water from entering into the fiber bundles of textile geogrids, thereby preventing various effects caused by water, such as deterioration due to the growth of mold and alkali leached from concrete. This eliminates deterioration caused by hydrolysis, resulting in a highly durable textile geogrid. Furthermore, a stable concrete structure can be obtained without the destruction of concrete caused by expansion due to rust, such as in reinforcing bars.

Claims (1)

[Claims] 1. A textile geogrid in which a resin is applied to a lattice-like fiber sheet made of synthetic fibers to which a water repellent is attached.