KR100253166B1 - Geogrid havig good flexibility and process of its production - Google Patents

Abstract

PURPOSE: Provided are a soft geogrid of a reinforcement for public works and building, and a manufacturing method thereof which are characterized by increasing finishing stability and process stability of a plastic sol. CONSTITUTION: The soft geogrid is obtained by a process containing the steps of: using a synthetic fiber filament yarn having over 8g/d of tensile strength and 1000-1500 of total fineness; doubling over two strings of the filament; using 3000-10000denier of a doubling yarn as a weft and a warp; interwinding a paper warp around the warp to produce a lattice sheet; adding plasticizer to PVC plastic sol having 4000-7000cps of B.F viscosity and 500-2000 of degree of polymerization, so producing PVC plastic sol compound having below 500 of B.F viscosity after 24hours; and then coating the PVC plastic sol compound on the lattice sheet. G stiffness of the soft geogrid is below 1000cm-g.

Description

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

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

2 is an enlarged view of an inclined portion in FIG. 1.

* Explanation of symbols for main parts of the drawings

1: inclined 2: weft

3, 3, '3 ", 3": warp composite twisted yarn

4: slope

The present invention relates to a geogrid (geogrid), which is a reinforcing material for civil engineering and construction, in particular, a geogrid having a soft property that can be easily applied in a difficult environment such as a curved surface or an inclined surface, and a manufacturing method thereof.

Geogrid is used for ground reinforcement, ground treatment, soil reinforcement before concrete treatment, civil engineering such as shielding for construction, construction reinforcement, and conventional plastic (stretched) geogrid draws general purpose plastics (polyester, polypropylene, etc.) Prepared. However, these conventional geogrids are difficult to use in applications with high loads or loads due to their low strength and high elongation, and in order to remedy this weakness, a method of increasing the weight of geogrids has been used. This also had a risk of deterioration in portability and workability. 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 has a very hard or stiff disadvantage due to its focus only on increasing strength, which makes it difficult to construct over a wide range of areas, such as when it is used for civil engineering, construction purposes, curved surfaces, slopes, etc. It showed a limit to the development of the application. In addition, due to the unstable processing stability of the plastisol for strong reinforcement of the geogrid, the gelation phenomenon often occurs and, in some cases, the lining was unable to 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 is a combination of two or more high-strength synthetic fiber filament yarn of tensile strength 8g / d or more, elongation 10 to 17%, fineness 1000 to 1500 denier made into a twisted yarn of 3000-10000 denier, then In the conventional method of manufacturing a geogrid using a twisted yarn or single strand as a weft yarn, in which a warp yarn is entangled with 300 to 500 denier synthetic fiber filament geoslopes, the lattice sheet is woven, and a synthetic resin is coated thereon. The method for producing soft geogrid, which is a reinforcing material for civil engineering and construction, is characterized in that the synthetic resin for coating uses BP viscosity of 4000 to 600 cps and a degree of polymerization of 500 to 2000, which is expressed in DP (Degree of polymerization). To provide.

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 cords, preferably polyester, polyamide, polyvinyl alcohol fiber, and through the twisting process using a polyester high-strength yarn of 1000 to 1500 denier According to the purpose, it is preferable to manufacture 3000 to 10000 denier-ply-twisted yarns and use them by forming a group of single yarns to suede strands. In particular, in terms of tenacity, a tensile strength of more than 8 g / d should be used. If the tensile strength of the yarn is less than 8 g / d, more yarns are needed to provide sufficient reinforcing effect. There is a possibility of problems and economic inefficiency.

The elongation of the yarn 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 for manufacturing 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 of the 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 warp used to wind the warp yarns to impart morphological stability in the use of the above-mentioned twisted yarns in the warp yarn warp is preferably 300 to 500 denier synthetic fiber filament yarn. The method of application is applied in such a way that the shape stability of the multiple bones in the slope can be secured as shown in FIG.

In other words, Figure 1 is a general schematic diagram of the lenoji applied to the present invention is a structure in which the warp yarns 1 weave (2), in the present invention, as shown in Figure 2 of the plurality of warp composite twisted yarn (3, 3, '3, "3,") aligns in one direction to increase the strength utilization, and the inclined twisted yarns (3, 3,' 3, "3,") are intertwined with the diagonal warp yarns (4). Wrapping

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 grating is the value specified by 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. 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 4000 to 700 Ocps, a low yield point, and no dilatancy in the low shear region.

If the B.F viscosity is less than 400 cps, the flow characteristics are poor due to low viscosity. If the B.F viscosity is higher than 7000 cps, coating workability is poor.

Here, the B.F viscosity is measured by the test standard ASTM D 1824, and is measured by the spindle No. 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, 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 a gel concept rather than a sol concept, and thus the flow characteristics disappear. This degree of polymerization acts as an essential factor in the manufacture of soft 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 (abbreviation G) value used is defined as less than 100 cm-g.

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 To compare the BF viscosity at 6 rpm and 12 rpm at two types of spindle rotational speeds, to grasp the objectivity. In the present invention, it is particularly preferable that the BF viscosity at the time of 24 hours is 50Ocps 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, a plasticizer may be used and the plasticizer plays an important role in improving the flow characteristics of the PVC plastisol and improving process stability and process stability. Preferred types of suitable plasticizers in the present invention include phthalate-based, adipate-based, and the like. Phthalate-based phthalate-based phthalates include DMP (Dimethyl Phthalate), DEP (Diethyl Phthalate), DBP (Dibutyl Phthalate), DOP (Dioctyl Phthalate), and DIDP (Diisodecyl Phthalate). ), DINP (Diisononyl Phthalate) and the like are used as the adipate system, DOA (Dioctyl Adipate), DIDA (Diisodecyl Adipate), DINA (Diisononyl Adipate) and the like are used.

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 used is less than 5 parts by weight, preferably 1 parts by weight or less based on 100 parts by weight of PVC plastisol. If 5 parts by weight or more is used, there is a risk of impairing the stability.

In the present invention, an antimicrobial agent is used as another additive used in the PVC plastisol, and the antimicrobial agent prevents corrosion due to bacteria or fungi in soil that may be generated from existing fibrous geogrids, thereby providing a fibrous geogrid having excellent bacteria resistance. It can manufacture. As a preferable antimicrobial agent, an organic arsenic compound is used, and an organic compound containing arsenic, such as iron methane arsenate, ammonium iron methane arsenate, and calcium methane arsenate, is 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 an advantage in many respects, and the prior art focuses only on increasing the strength, so that the geogrid exhibits the disadvantage of being extremely hard or stiff. Although the construction difficulty is shown in the work over a large area of the back and the limit of the development of the use, the soft geogrid of the present invention due to the excellent softness, when constructing for civil engineering, construction purposes, curved surface, slope, etc. 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 the processing stability of the plastisol is unstable, because the gelation phenomenon often occurs, 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% was used as 300d as a steep slope component as shown in FIG. 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 plastisol compound for producing the soft geogrid was used as a plastisol of DP 100 with excellent B.F viscosity of 5, Ocps and polymerization degree of 1,0000. Process stability and process stability were measured by test standard ASTH D 1824, and the B.F viscosity measured by spindle No. 7 on a rotary RV type Brookfield viscometer was used. The measured B.F viscosity of the PVC plastisol was 500Ocps.

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 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.

The B.F viscosity and the G stiffness of the soft geogrid were measured to determine the processing and process stability of the PVC plastisol compound for the production 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 the PVC plastisol used in the PVC plastisol compound for the production of the soft geogrid was a plastisol with poor flow characteristics with a BF viscosity of 3,000 cps and a polymerization degree of 300 in paste form. 100 parts by weight of a phosphate-based plasticizer was used as an additive based on 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.

TABLE 1

* G Lecture: ASTH D 1388 Cantilever Method

* B.F Viscosity: ASTH D 1824, Rotary type RV type Brookfteld Viscometer, Spindle 7 measurement

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

Claims (5)

In the conventional geogrid manufacturing method of laminating a lattice sheet using synthetic fiber filaments and coating a synthetic resin thereon, the synthetic fiber filaments are synthetic fibers having a tensile strength of 8 g / d or more and a total fineness of 1000-1500. It is a multifilament yarn, which combines two or more strands to make 3000-10000 denier-bonded twisted yarn, and produces a lattice sheet interwoven with double warp yarns, and has a BF viscosity of 4000-700Ocps and DP (Degree of polymerization). By adding a plasticizer to the PVC plastisol having a degree of polymerization in the range of 500 to 2000, a PVC plastisol compound having a BF viscosity of 500 cps or less is produced after 24 hours of its manufacture, and then coated on the lattice sheet. Fabrication of soft geogrid, which is a reinforcing material for civil engineering and construction, characterized in that the G-strength of the geogrid manufactured through this is less than 1000cm-g. Law. The method of claim 1, wherein the geogrid-cutting synthetic fiber is used for high-strength synthetic fiber filament yarn of 10-17% elongation, and in the case of warp, it is used by interlocking with 300-500 denier synthetic fiber filament geo-slope. Method for producing soft geogrid as reinforcement. The method of claim 1, wherein a phthalate-based or adipate-based plasticizer is added to the synthetic resin for coating. The method of claim 1, wherein a stabilizer is added to the synthetic resin for coating. In a conventional geogrid in which a lattice sheet is woven using synthetic fiber filaments, and the synthetic resin is coated thereon, the lattice sheet is a synthetic fiber multifilament yarn having a tensile strength of 8 g / d or more and a total fineness of 1000-1500. It is composed by combining two or more strands of 3000-10000 denier as a light-weaving yarn, and double slant is intertwined with a local warp yarn, and the composite resin is composed of BF viscosity of 4000-700Ocps and degree of polymerization represented by DP (Degree of polymerization). A plasticizer was added to the PVC plastisol in the range of 500-2000, and coated on the lattice sheet as a PVC plastisol compound having a BF viscosity of 500 cps or less at 24 hours after its preparation, and the G-strength of the final geogrid was 1000 cm-. Soft geogrid, which is a reinforcing material for civil engineering and construction, characterized by less than g.