KR19980050089A - Soft geogrid, a reinforcing material for civil engineering and construction, and its manufacturing method - Google Patents

Abstract

According to the present invention, two or more strands of high strength synthetic fiber filament yarn of 8 g / d or more, 10 to 17% elongation, and 1000 to 1500 denier of fineness are joined to form a twisted yarn of 3000 to 10,000 denier. Use the strand as a weft yarn, but in the case of warp, use a mantle of 300 to 500 denier synthetic fiber filaments, and weave a lattice sheet of Léonic with a grid size of 4 to 50 mm, and have a BF viscosity of 4000 to 7000 on the lattice sheet. Provided is a method for producing geogrid for civil engineering and construction, characterized by coating PVC plastic cladding with CPS, PVC 500 ~ 2000, which has a medium weight. However, even though the weight is low, it has the effect of providing high utilization and soft geogrid.

Description

Soft geogrid, a reinforcing material for civil engineering and construction, and its manufacturing method

The present invention relates to geogrids, which are reinforcing materials for civil engineering and construction, in particular geogrids having soft properties that can be easily applied under difficult environments such as curved surfaces or slopes, and methods of manufacturing the same.

Geogrid is used for civil reinforcement such as soil reinforcement, soil treatment, soil reinforcement before concrete treatment, shielding for construction, construction reinforcement, and conventional plastic (stretched) geogrid is used to stretch general-purpose plastics (polyester, polypropylene, etc.) Prepared. However, such a conventional geogrid is difficult to use in applications where high strength or elongation is applied to high loads or loads, and a method of increasing the weight of the geogrid by increasing the thickness may be used to remedy this weakness. However, this also had a concern that the transportability and workability is deteriorated. In order to overcome such drawbacks, Korean Patent Application No. 96-24885 provides geogrid, which is a reinforcing material for civil engineering and construction, which has excellent workability, excellent corrosion resistance and strong efficiency in construction due to its smaller weight than existing products. It was. However, the geogrid exhibits a very hard or stiff disadvantage due to its focus only on increasing its strength, thereby preventing construction difficulties when working over a wide range of areas with construction, construction, curved surfaces, slopes, etc. It showed the limit to the development. In addition, the stability of the plastisol for strong reinforcement of the geogrid was also unstable, and gelation phenomenon often occurred, and in some cases, the processing could not be processed.

The present invention has been made in order to improve the above-mentioned drawbacks, in particular to improve the process stability and process stability through the improvement of the plastisol and geogrid obtained therefrom is a softness when using it for construction, civil engineering, construction It has the advantage that it can be easily applied over various wide areas such as curved surfaces and inclined surfaces.

More specifically, the present invention, after combining two or more high-strength synthetic fiber filament yarn having a tensile strength of 8g / d or more, elongation 10 to 17%, fineness 1000 to 1500 denier made of a twisted yarn of 3000 to 10000 denier, In the conventional method of manufacturing a geogrid using a twisted yarn as a single yarn or a suede weft yarn, in which a warp yarn is intertwined with a 300 to 500 denier synthetic fiber filament diameter yarn, and the lattice sheet is woven and coated with a synthetic resin thereon. In the geosynthetic and construction reinforcement, the geosynthetic resin is characterized in that the synthetic resin for coating uses a PVC plastic having a BF viscosity of 4000 to 6000 cps and a degree of polymerization of 500 to 2000 expressed in DP (Degree of polymerization). It is to provide a method of manufacturing.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Synthetic fiber filament yarn used in the present invention is a high-strength yarn used for industrial use such as tire cord, preferably polyester, polyamide, polyvinyl alcohol fiber, and through the twisting process using polyester high-strength yarn of 1000 to 1500 denier It is preferable to manufacture 3000 to 10,000 denier plywood according to the purpose, and to use a single yarn to form a group. In particular, in terms of tenacity, a yarn with a tensile strength of 8 g / d or more should be used. If the tensile strength of the yarn is less than 8 g / d, more yarn is required to produce a sufficient reinforcing effect. Problems with gender can arise and are inefficient in terms of economy.

The elongation of the yarn to be used in the present invention needs to be in the range of 10 to 17%, and when the elongation is less than 10%, the impact resistance at the time of use in the final product is lowered, whereas the elongation exceeds 17%. Since the shape stability at the time of use may have a problem, the elongation of a yarn in this invention needs to be in the said range.

Inspector yarn used to manufacture the lattice sheet in the present invention is a single yarn or twisted yarn made by twisting and joining two or more strands so that the total warp yarn denier is 3000 to 10,000 denier with a high-strength yarn having the above yarn fineness of 1000 to 1500 denier The sum of the number of strands is used, and the total denier and number of yarns can be arbitrarily selected according to the purpose of the end use.

In the present invention, the ground wam used to wind the warp yarn to impart morphological stability in the use of the above-mentioned twisted twisted yarn in the shingles warp yarn is preferably 300 to 500 denier synthetic fiber filament yarn. The method of application is applied in such a manner as to entwine the shape stability of the plurality of bones in the slope as shown in FIG.

In other words, Figure 1 is a general schematic diagram of the lenojik applied to the present invention is a structure in which the warp yarns (1) weaving the weft (2) in the present invention, in the present invention, as in the case of three degrees of warp composite twisted yarn (3, 3, In order to reliably align, 3, 3,) in one direction, the inclined twisted yarns 4, 3, 3, 3, 3 are enclosed by a plurality of warp yarns.

The lattice size in the lattice sheet of the geogrid according to the present invention is usually determined in accordance with the purpose in the range of 4 to 50 mm, and may be out of this range depending on the use. The size of the grid is the value specified for d, d 'in FIG.

Synthetic resin applied on the lattice sheet, which is characteristically adopted in the present invention, has weathering resistance, acid resistance, bacteria resistance, etc. necessary for civil engineering and building reinforcement, and can be used by adding a plurality of additives to PVC, acrylic resin, etc. Among the various types of PVC, it is preferable to use paste-like plastisol. It is particularly preferable that the plastisol has a B.F viscosity of 4,000 to 7000 cps, a low yield point, and no dilatancy in the low shear region. If the B.F viscosity is less than 4000 cps, the flow characteristics are poor due to low viscosity, and if it is more than 7000 cps, coating workability is poor.

Here, the B.F viscosity is measured by test standard ASTM D 1824 and is measured by spindle number 7 on a rotary type RV Brookfield viscometer.

In addition, in the present invention, PVC plastisol is measured by the test standard JIS K 6712, and it is preferable to use a polymerization degree expressed in DP (Degree of Polymerization) in the range of 500 to 2000. If the degree of polymerization is less than 500, it does not function as a plastisol, and if the degree of polymerization exceeds 2000, it leads to the gel concept rather than the sol concept, and thus the flow characteristics disappear. This degree of polymerization acts as an essential factor in the manufacture of flexible geogrids that can be used for soft ground reinforcement and civil construction, where soft geogrids are measured by ASTM D 1388 Cantilever method, which is a measure of stiffness. Flexural Rigidity (abbreviated G) value used is defined as 1000 cm-g or less

The geogrid obtained according to the present invention will provide a good soft geogrid that satisfies the above-mentioned range.

The stability over time of the PVC plastisol compound used in the present invention is also an important factor, which directly affects processing and process stability. The BF viscosity and 24 hours after 1 hour after the production of the PVC plastisol compound In order to grasp the objectivity by comparing the BF viscosity at the two spindle speeds of 6 rpm and 12 rpm, in the present invention, it is particularly preferable that the BF viscosity at the time of 24 hours is 500 cps or less. In view of process stability, it shows a disadvantage of a compound that is considerably unstable, which makes it impossible to produce the desired soft geogrid.

Various additives may be used in the PVC plastisol used in the present invention. Preferably, plasticizers can be used, and plasticizers play an important role in improving the flow characteristics of PVC plastisols and improving process and process stability. Preferred types of suitable plasticizers in the present invention include phthalate-based, adipate-based, and the like. Phthalate-based phthalates include DMP (Dinlethyl Phthalate), DEP (Diethyl Phthalate), DBP (Dibutyl Phthalate), DOP (Dioctyl Phthalate), and DIDP (Diisodecyl Phthalate). ), DINP (Diisoonyl Phthalate) and the like are used as the adipate system, DOA (Dhocty1 Adipate), DlDA (Diisodecyl Adipate), DINA (Diisonony1 Adipate) and the like. The amount used is preferably less than 100 parts by weight, preferably 50 to 100 parts by weight based on 100 parts by weight of PVC plastisol. If more than 100 parts by weight of plasticity is rapidly increased there is a risk of losing the flow characteristics of the plastic sol and if less than 50 parts by weight there is a disadvantage that the plasticity is difficult to be exhibited.

In the present invention, a stabilizer is used as another additive used in the PVC plastisol, and the stabilizer contributes to process stability and process stability by improving the solution stability of the plastisol. Preferred stabilizers include metal salts of higher fatty acids, organotin stabilizers, lead stabilizers and the like. The amount of use is less than 5 parts by weight, preferably 1 parts by weight or less based on 100 parts by weight of PVC plastisol. If you use more than 5 parts by weight, there is a risk of harm.

In the present invention, an antimicrobial agent is used as another additive used in PVC plastisol, and the antimicrobial agent prevents corrosion due to bacteria or molds in soil that may be generated from existing fibrous geogrids. It can manufacture. As a preferable antimicrobial agent, an organic arsenic compound is used, and organic compounds containing arsenic, such as methane arsenic acid, ammonium iron ammonium ferrate, and calcium methane arsenate, are used. The amount used is less than 3 parts by weight, preferably 1 parts by weight or less, based on 100 parts by weight of PVC plastisol. When using more than 3 parts by weight, there is a disadvantage that the cost is increased compared to the antimicrobial improvement.

The geogrid obtained according to the present invention provides advantages in many respects, and the prior art focuses solely on increasing the strength, so that the geogrid exhibits the disadvantage of being extremely hard or stiff. Although it showed difficulties in construction for the work over a large area of the back and showed the limitation of development, the soft geogrid according to the present invention has excellent softness. In spite of the environment, it is possible to develop various applications by providing flexibility in construction.

In addition, the prior art had an anxiety that can not be processed due to the instability of the plastisol due to the instability of the plastisol, but the present invention has greatly improved the process stability and process stability due to the improvement of the plastisol It provides an advantage that enables the production of soft geogrids.

An Example is given to the following and this invention is further demonstrated to it.

Example 1

A polyester high strength yarn having a tensile strength of 8.3 g / d and an elongation of 14% is used as the steep component as shown in FIG. 2, and 300d is used as the steep slope component. Is 80000d / 8ply, weft yarn is used as 20000d / 2ply, it is knitted into the structure of Fig. 1, but the lattice size (d × d ') is 10mm × 10mm to form a knit sheet to prepare a lattice sheet, PVC plastisol compound Was processed by the conventional method by the dipping method to prepare a soft geogrid.

The PVC plastisol used in the PVC flantisol compound for producing the soft geogrid was used as a plastisol having excellent flow characteristics in the form of a paste. Process stability and process stability were determined by test standard ASTM D 1824, and the B.F viscosity measured by spindle No. 7 in a rotary type RV type Brookfield viscometer was used.

A phthalate plasticizer was used in the PVC plastisol with respect to 100 parts by weight of 100 parts by weight of the PVC plastisol.

As a stabilizer, 1 part by weight of a metal salt of higher fatty acid was used based on 100 parts by weight of PVC plastisol. As an antimicrobial agent, 1 part by weight of the organic arsenic compound based on 100 parts by weight of the PVC plastisol.

The method of confirming the soft geogrid degree was measured by the test standard ASTM D 1388 cantilever method. After preparing the PVC plastisol compound, the process stability of the PVC plastisol compound was determined by comparing the B.F viscosity at 1 hour and the B.F viscosity at 24 hours.

B.F viscosity to determine the processing and process stability of the PVC plastisol compound for the production of soft geogrid was measured G steel degree of the soft geogrid and the results are shown in Table 1.

Example 2

The same method as used in Example 1 was used, but 100 parts by weight of adipate based on 100 parts by weight of PVC plastisol was used as a plasticizer.

The B.F viscosity and G hardness of the soft geogrid to understand the processing and process stability of the PVC plastisol compound for the preparation of the soft geogrid are shown in Table 1 below.

Comparative Example 1

The same method as used in Example 1 was used, but 100 parts by weight of a phosphate plasticizer was used as an additive with respect to 100 parts by weight of PVC plastisol.

The B.F viscosity and G hardness of the soft geogrid to understand the processing and process stability of the PVC plastisol compound for the preparation of the soft geogrid are shown in Table 1 below.

* G Lecture: ASTM D 1388 Cantilever Method

* B.F Viscosity: ASTM D 1824, Rotary type RV type Brookfteld Viscometer, Spindle

7 measurements

* cps: B.F viscosity unit, abbreviation of centi poise.

1 is a schematic diagram of lenojik employed in the present invention,

FIG. 2 is an enlarged view of the inclined portion in FIG.

◆ Design of symbols for main parts of drawings

1: Bevel 2: Weft

3,3, '3, 3' ': Combination of slope composition

4: ground slope

Claims (6)

In the conventional geogramme manufacturing method of laminating a lattice sheet using synthetic fiber filaments and coating a synthetic resin thereon, the coating synthetic resin has a BF viscosity of 4000-7000 cps and is expressed in DP (Degree of polymedzation). A method of manufacturing soft geogrid, which is a reinforcing material for civil engineering and construction, characterized by using PVC plastics having a degree of polymerization of 500-2000. The method of claim 1, Geogrid-cutting synthetic fiber is made of 30-10000 denier of twisted yarn after joining two or more strands of high strength synthetic fiber filament yarn with tensile strength of 8g / d, elongation 10-17%, and fineness 1000-1500 denier. The method of manufacturing soft geogrid, which is a reinforcing material for civil engineering and construction, characterized in that a single yarn or sugi is used as a weft yarn, but in the case of a slope, it is entangled with a synthetic fiber filament geo-slope of 300-500 denier. The method of claim 1, Method for producing a soft geogrid as a reinforcing material for civil engineering, building, characterized in that the phthalate- or adipate-based plasticizer is added to the coating synthetic resin. The method of claim 1, Civil, building beams characterized in that the stabilizer is added to the coating synthetic resin Manufacturing method of soft geogrid which is steel. The method of claim 1, A method for producing soft geogrid, which is a reinforcing material for civil engineering and construction, characterized in that an antimicrobial agent is added to the synthetic resin for coating. G Soft geogrid with civil and construction reinforcement of less than 1000cm -g and less than 500cps after 24 hours of B.F viscosity.