KR20210018642A - Resin composition for multilayer hard polyvinyl chloride earthquake-proof water and sewage pipe and multilayer hard polyvinyl chloride earthquake-proof water and sewage pipe using the same - Google Patents

Abstract

The present invention relates to a resin composition for a multi-layer hard polyvinyl chloride earthquake-proof water and sewage pipe and to a multi-layer hard polyvinyl chloride earthquake-proof water and sewage pipe using the same. More particularly, the present invention relates to a resin composition for a multi-layer hard polyvinyl chloride earthquake-proof water and sewage pipe, which can be applied to an earthquake-proof water and sewage pipe with improved deviation strength, impact resistance, and the like, and to a multi-layer hard polyvinyl chloride earthquake-proof water and sewage pipe using the same.

Description

Resin composition for multilayer hard polyvinyl chloride earthquake-proof water and sewage pipe and multilayer hard polyvinyl chloride earthquake-proof water and sewage pipe using the resin composition for multilayer hard polyvinyl chloride earthquake-proof water and sewage pipe using the same}

The present invention relates to a resin composition for multi-layer hard polyvinyl chloride seismic water and sewage pipes, and to a multi-layer hard polyvinyl chloride seismic water and sewer pipe using the same.More specifically, the separation strength and impact resistance are improved, which can be applied to seismic water and sewage pipes. The present invention relates to a resin composition for multilayer rigid polyvinyl chloride seismic water and sewage pipes, and a multilayer rigid polyvinyl chloride seismic water and sewage pipe using the same.

Pipes for water and sewage have conventionally used various materials, and among them, metal pipes have been mainly used, but metal pipes have a problem due to corrosion of the pipes, and in recent years, synthetic resins have occurred due to the development of the petrochemical industry. The tube began to be used.

Synthetic resin pipes are widely used in various fields due to their excellent chemical resistance, corrosion resistance and processability, and excellent physical and chemical properties compared to inexpensive prices, but disadvantages that are vulnerable to heat resistance, weather resistance, tensile strength and impact resistance have been pointed out.

Among the synthetic resin pipes described above, vinyl chloride resin (PVC) used as a water pipe is stable against chemical reactions such as corrosion and oxidation, its processing is easy, and its weight is light, so it is very easy to handle and work. The strength and the like are remarkably low, and there is a concern about damage due to external pressure.

In order to overcome these shortcomings, recently, a vinyl chloride resin synthetic resin pipe is formed as a triple-walled pipe having an inner layer, an outer layer and an intermediate layer, and additives such as heat stabilizers, processing aids, ultraviolet rays inhibitors, impact modifiers, and fillers are used. It is common to use synthetic resin pipes with excellent impact properties and tensile strength and excellent physical properties.

As a literature on the conventional triple-walled vinyl chloride-based pipe, the inventor's Patent No. 10-0338254, which includes vinyl chloride resins (hard and soft) and impact modifiers having different properties in the inner, outer and intermediate layers. (CPE and MBS), complex stabilizers (tin-based and lead-based) and lubricants (internal and external lubricants) were used.

In addition, a method of using a mixture of CPE and MBS in order to solve the shortcomings of the CPE-based impact modifier is described in Registration Patent No. 10-0341868 of the present inventor, and a zeolite antibacterial agent is added to the vinyl chloride resin for triple wall pipes. The method to use is described in Patent Registration No. 10-0797189. In addition, documents related to multi-layer water and sewage pipes in which physical properties are improved by adjusting the component content and interface of each layer include Patent Publication No. 10-2019-0079740 and Patent Publication No. 10-1960771.

Meanwhile, in Korea, the frequency of earthquakes is steadily increasing not only in Gyeongju, but also in Hongseong, Iksan, and Ulsan. Water and sewage pipes are'lifelines' necessary for survival along with electricity, communication, gas, etc., but they are buried underground, so it is difficult to find damaged parts when earthquakes occur, so earthquake-resistant design should be able to prevent damage caused by earthquakes when manufacturing products.

However, despite the high possibility of “the seriousness of household water supply and sewage treatment” and “secondary problems such as infectious disease transmission concerns” in the event of an earthquake, in Korea, the seismic application rate of public facilities such as water supply and sewage treatment and public sewage treatment is 24.5%. It is a low situation, and most of the seismic designs are limited to water purification plants and treatment facilities.

In addition, the existing water and sewage pipes mostly used rigid pipes such as reinforced concrete pipes, cast iron pipes, and concrete pipes, but the aging, corrosion and watertightness of most pipes, and insufficient maintenance of continuous maintenance have been raised as problems.

Therefore, to prevent ground subsidence, soil or groundwater contamination due to leakage of water and sewage pipe connection due to external load changes such as earthquake, ground subsidence, and traffic load, tensile strength, impact strength, breakaway strength and vibration test values are excellent. Therefore, it is necessary to develop water and sewage pipes that do not cause damage and leakage due to vibration, distortion, and deformation due to external loads by improving seismic performance.

KR 100338254 B1 KR 100341868 B1 KR 100797189 B1 KR 1020190079740 A KR 101960771 B1

The present invention is to solve the problems of the prior art described above, the separation strength, impact strength, etc. are improved, such as a multi-layer hard polyvinyl chloride seismic water and sewage pipe resin composition that can be applied to the seismic water and sewage pipe and multi-layer hard polychlorination using the same It is a technical task to provide vinyl seismic water and sewage pipes.

In order to achieve the above technical problem, the present invention is the multi-layer rigid polyvinyl chloride seismic water and sewage pipe includes an outer layer, an intermediate layer and an inner layer from the outside,

The synthetic resin composition of the outer layer and the inner layer is a core-shell type acrylic impact modifier coated with an outer lubricant having a melting point of 90°C or higher, core-shell type silicone impact modifier, or core-shell type CPE impact per 100 parts by weight of vinyl chloride resin with a polymerization degree of 800 to 1,200. 4 to 10 parts by weight of two or more impact modifiers selected from reinforcing agents, 2 to 6 parts by weight of filler, 0.5 to 2.5 parts by weight of processing aid, 2.5 to 3.5 parts by weight of heat stabilizer, and 0.5 to 1.0 parts by weight per R-paper,

The synthetic resin composition of the intermediate layer is a core-shell type MBS-based impact modifier and a core-shell type CPE impact modifier coated with an external lubricant having a melting point of 90°C or higher per 100 parts by weight of a vinyl chloride resin having a polymerization degree of 1,200 to 2,000. Including 4 to 10 parts by weight of an impact modifier mixed with 0, 2 to 6 parts by weight of a filler, 0.5 to 2.5 parts by weight of a processing aid, 2.5 to 3.5 parts by weight of a heat stabilizer, and 0.5 to 1.0 parts by weight per R-paper,

It provides a resin composition for multilayer hard polyvinyl chloride seismic water and sewage pipes.

According to another aspect of the present invention, there is provided a multi-layer rigid polyvinyl chloride seismic water and sewage pipe prepared by the composition.

According to another aspect of the present invention, there is provided a method of manufacturing a multilayer hard polyvinyl chloride seismic water and sewage pipe, comprising: a blending step of blending the composition; Extrusion step of extrusion molding water and sewage pipes using the blended composition; And there is provided a method of manufacturing a multi-layered rigid polyvinyl chloride seismic water and sewer pipe comprising; and a single processing step of knitting the extruded water and sewage pipe.

Seismic water and sewage pipes made of the resin composition for multi-layer rigid polyvinyl chloride seismic water and sewage pipes according to the present invention consist of multiple layers of an outer layer, an intermediate layer and an inner layer, and because the components and composition ratios of each layer are mixed differently, the tensile strength, It is excellent in impact resistance and breakaway strength, which improves seismic performance. Accordingly, it is possible to prevent the occurrence of damage or leakage due to vibration, distortion, and deformation caused by external loads such as earthquakes, ground subsidence, and traffic loads. By coating the impact modifier with a lubricant, dispersibility and workability are improved, and impact resistance is uniformly improved in all sections of the water and sewage pipes.

Hereinafter, the present invention will be described in more detail.

As a multilayer rigid polyvinyl chloride seismic resin composition for water and sewage pipes of the present invention,

The multi-layer rigid polyvinyl chloride seismic water and sewage pipe includes an outer layer, an intermediate layer, and an inner layer from the outside,

The synthetic resin composition of the outer layer and the inner layer is a core-shell type acrylic impact modifier coated with an outer lubricant having a melting point of 90°C or higher, core-shell type silicone impact modifier, or core-shell type CPE impact per 100 parts by weight of vinyl chloride resin with a polymerization degree of 800 to 1,200. 4 to 10 parts by weight of two or more impact modifiers selected from reinforcing agents, 2 to 6 parts by weight of filler, 0.5 to 2.5 parts by weight of processing aid, 2.5 to 3.5 parts by weight of heat stabilizer, and 0.5 to 1.0 parts by weight per R-paper,

The synthetic resin composition of the intermediate layer is a core-shell type MBS-based impact modifier and a core-shell type CPE impact modifier coated with an external lubricant having a melting point of 90°C or higher per 100 parts by weight of a vinyl chloride resin having a polymerization degree of 1,200 to 2,000. It includes 4 to 10 parts by weight of an impact modifier mixed with 0, 2 to 6 parts by weight of a filler, 0.5 to 2.5 parts by weight of a processing aid, 2.5 to 3.5 parts by weight of a heat stabilizer, and 0.5 to 1.0 parts by weight per R-paper.

Seismic water and sewage pipes made of the resin composition for multi-layer rigid polyvinyl chloride seismic water and sewage pipes of the present invention may include three layers of an outer layer, an intermediate layer, and an inner layer from the outside as disclosed in FIG. 1, and in the present specification, the outer layer is It can be called "skin layer" and the inner layer can be called "center layer".

In the multilayer rigid polyvinyl chloride seismic water and sewer pipe of the present invention made of the above composition, the shock applied to the synthetic resin pipe is partially refracted and partially reflected by the principle of the superposition of the shock wave, thereby dispersing and attenuating the shock wave. It was possible to obtain a synthetic resin tube with excellent physical properties, which further improved the effect of and improved tensile properties such as torsion.

The seismic water supply and sewer pipe of the present invention is dispersed and attenuated according to the so-called The Superposition Principle of Impact Pulse when an external impact is applied, so that it can exhibit excellent tensile strength, impact resistance, and breakaway strength. have.

The impact modifiers used for the outer layer, the intermediate layer and the inner layer are commonly used core-shell structured MBS, acrylic, silicone and CPE resins, and core-shell structured MBS, acrylic, and silicone impact modifiers are used for external lubricants. It is coated by

The MBS-based impact modifier has excellent impact resistance and cold resistance, but has poor corrosion resistance and weather resistance, and the acrylic impact modifier has slightly inferior impact resistance compared to MBS-based, but has excellent weatherability, numerical stability, thermal stability, and extrusion amount.

In addition, silicone-based impact modifiers have excellent low-temperature impact strength, have excellent chemical properties such as corrosion resistance and weather resistance, but the surface is rough due to poor workability and low productivity, and the price is relatively high, and CPE has relatively low impact strength, but the price is low. It is economical.

The outer lubricant coating of the core-shell impact modifier is melt-coated by adding 1 to 15% by weight, preferably 5 to 12% by weight of the external lubricant to the impact modifier, depending on the type of the impact modifier.

The external lubricant is used having a melting point of 90° C. or higher, and preferable ingredients include polyethylene wax, metal soap (calcium stearate, magnesium stearate), and the like.

If the melting point of the external lubricant is less than 90°C, it is significantly lower than the 120 to 150°C, which is the processing temperature of the vinyl chloride resin, and the external lubricant may be melted in advance and thus impair the dispersibility of the impact modifier.

In the coating method of the core-shell impact modifier, the impact modifier is 85 to 99% by weight and 1 to 15% by weight of an external lubricant is heated to 100 to 150°C in a heating stirrer while stirring for 20 to 60 minutes, and then at 50°C or less. Cooling to prepare an impact modifier coating powder.

The above coating protects the impact modifier by coating the impact modifier with an external lubricant with a low gelling load and reinforces the disadvantages when using a single impact modifier, and prevents productivity load by supplementing the roughness of the surface of the impact modifier by coating. , Internal and external activity and dispersibility were improved, the gelling time of the formulation was reduced, the gelling promotion effect was improved, and the gelling load was reduced, thereby solving the problems of mechanical and extrusion molding.

In particular, by compensating for the disadvantages of silicone-based impact modifiers, that the surface is rough, resulting in poor gloss and decreased productivity, productivity is improved and scratch resistance is secured, and the earthquake resistance, weather resistance, low temperature impact strength, thermal stability and It was confirmed that chemical resistance can be improved.

Since the outer layer of the seismic water and sewage pipe of the present invention is relatively directly affected by changes in external temperature, ultraviolet rays, environmental pollution, etc., it is mainly composed of acrylic impact modifiers that are weather resistant or chemically safe, and silicone impact modifiers with excellent low temperature impact strength and An inexpensive CPE-based impact modifier is complementarily used, and the mixing ratio of the silicone-based:acrylic-based impact modifier is 1:3 to 1:5, and the CPE-based impact modifier is 10 to 50 weight of the impact modifier. % Can be mixed and used, and vinyl chloride resin is also used with a polymerization degree of 800 to 1,200 excellent in impact resistance.

If the silicone-based impact modifier is added in excess of the above ratio, processability and economical efficiency are deteriorated, and when it is added in a small amount, low-temperature impact properties are inferior.

The inner layer is used as a part in direct contact with the fluid, and it must have excellent corrosion resistance and prevention of changes in physical properties due to temperature change of the inner fluid.Since the surface must be smooth to minimize fluid resistance, chemical properties such as processability, corrosion resistance, and weather resistance These excellent acrylic impact modifiers and CPE impact modifiers are used, and MBS impact modifiers that lack corrosion resistance are not used.Silicone impact modifiers with improved workability by coating with external lubricants to compensate for low-temperature impact strength due to changes in fluid temperature Can be used, and the mixing ratio of the acrylic-based: CPE impact modifier is added in a ratio of 1:1 to 2:1, and the ratio of the silicone impact modifier is 5 to 15% by weight additionally mixed and used. If the impact modifier is added in excess of the above ratio, the workability is deteriorated, and the surface properties are deteriorated.

In addition, a zeolite-based inorganic antibacterial agent or silver nanomaterial is added to the inner layer as an antimicrobial agent, and the content thereof is preferably added in an amount of 0.1 to 1.0 parts by weight relative to 100 parts by weight of the polyvinyl chloride resin within the general range used in the prior art. If the amount is less than 0.1 parts by weight, the antibacterial effect is insignificant, and even if it is added in excess of 1.0 parts by weight, there is no special increase in antibacterial activity, and it causes cost increase due to the overexploitation of expensive inorganic antibacterial agents, and processability decreases. do.

And the vinyl chloride resin used for the inner layer is a resin having a polymerization degree of 800 to 1,200 in terms of processability and temperature stability.

As the intermediate layer, an MBS impact modifier having excellent impact resistance is used, and additionally, a CPE impact modifier may be mixed in an amount of 50% by weight or less.

When the CPE impact modifier exceeds 50% by weight, the impact strength may be lowered, and the vinyl chloride resin is configured to have high tensile strength using a resin having a polymerization degree of 1,200 to 2,000, for example, a polymerization degree of 1,500 to 2,000.

It is preferable to add 4 to 10 parts by weight of the impact modifier used in each layer relative to 100 parts by weight of the vinyl chloride resin, and when adding less than 4 parts by weight, there is little effect of improving the impact strength, exceeding 10 parts by weight. If added, the tensile strength drops sharply.

The vinyl chloride resin composition of each layer includes commonly used fillers, heat stabilizers, colorants, processing aids, and may further include an ultraviolet ray inhibitor, an antistatic agent, and the like.

As the filler, it is preferable to use 2.0 to 6.0 parts by weight of calcium carbonate (CaCO ₃ ) based on 100 parts by weight of the vinyl chloride resin.

As a heat stabilizer, there is no dissolution or elution of heavy metals, and non-toxic Ca-Zn, Ca-stearate[Ca(C ₁₇ H ₃₅ COO) ₂ ], Zn-stearate[Zn(C ₁₇ H ₃₅ COO) ₂ ] or tin- It is preferable to use 2.5 to 3.5 parts by weight of a single or mixed liquid stabilizer of Raulate (Tin-Raulate) and Tin-Malate based on 100 parts by weight of the vinyl chloride resin.

As the colorant, R-lipidose is used, and it is preferable to use 0.5 to 1.0 parts by weight based on 100 parts by weight of the vinyl chloride resin.

As a processing aid, it is preferable to use 0.5 to 2.5 parts by weight of PA 828 of LG Chem based on 100 parts by weight of vinyl chloride resin.

In addition, although not particularly limited, the content of the heat stabilizer included in the synthetic resin composition of the outer layer and the inner layer may be 3.0 parts by weight or more, 3.1 parts by weight or more, 3.2 parts by weight or more, or 3.3 parts by weight or more, and 3.5 parts by weight or less or 3.4 It may be less than or equal to parts by weight, for example, 3.0 to 3.5 parts by weight.

In this way, when the content of the heat stabilizer contained in the outer layer and the inner layer is increased, that is, when the content of the heat stabilizer is increased by 2.5% or more to 5% or more compared to the existing input amount, physical properties such as tensile strength and impact resistance can be improved, and color deterioration can be prevented. Can be prevented.

In addition, the content of the impact modifier included in the synthetic resin composition of the outer layer and the inner layer may be 6 parts by weight or more, 7 parts by weight or more, or 8 parts by weight or more, and may be 10 parts by weight or less or 9 parts by weight or less, for example, 6 to It may be 10 parts by weight.

In this way, when the content of the impact modifier contained in the outer layer and the inner layer increases, that is, when the content of the impact modifier is increased by 2.5% or more to 7.5% or more compared to the existing amount, physical properties such as tensile strength and impact resistance can be improved, and color deterioration can be prevented. Can be prevented.

Although not particularly limited, the synthetic resin composition of the outer layer and the inner layer may include a vinyl chloride resin having a polymerization degree of 800 to 1,200. By varying the degree of polymerization of the vinyl chloride resin included in the outer layer and the inner layer as described above, physical properties such as tensile strength and impact strength may be improved, and color deterioration may be prevented.

According to another aspect of the present invention, there is provided a multi-layer rigid polyvinyl chloride seismic water and sewage pipe prepared by the composition of the present invention.

According to another aspect of the present invention, there is provided a method for manufacturing a multilayer rigid polyvinyl chloride seismic water and sewage pipe, comprising: a blending step of blending the composition of the present invention; Extrusion step of extrusion molding water and sewage pipes using the blended composition; And there is provided a method of manufacturing a multi-layered rigid polyvinyl chloride seismic water and sewer pipe comprising; and a single processing step of knitting the extruded water and sewage pipe.

Although not particularly limited, in the extrusion step of the manufacturing method, the temperature of the extrusion cylinder may be 180°C to 190°C, the temperature of the die block may be 170°C to 175°C, and the temperature of the die may be 200°C to 210°C.

Hereinafter, the present invention will be described in more detail through Examples and Comparative Examples. However, the scope of the present invention is not limited by these examples.

[ Example ]

Preparation of synthetic resin composition for outer layer

1,000 kg of vinyl chloride resin with a polymerization degree of 1,000, acrylic impact modifier of Example 2 40 kg, CPE impact modifier 20 kg, silicone impact modifier of Example 3 10 kg, processing aid 15 kg, non-toxic thermal stabilizer Ca-Zn 35 kg , CaCO ₃ 40 kg and R-lipidang 5 kg were mixed and mixed for about 20 minutes in a supermixer at 125° C. and then cooled at room temperature.

Preparation of synthetic resin composition for intermediate layer

A mixture of 1,000 kg of a vinyl chloride resin with a polymerization degree of 1,700, 70 kg of MBS impact modifier of Example 1, 15 kg of processing aid, 35 kg of non-toxic thermal stabilizer Ca-Zn, 40 kg of CaCO ₃ and ₅ kg of R-paper at 120°C After mixing for about 15 minutes in a super mixer of, it was cooled at room temperature.

Preparation of synthetic resin composition for inner layer

Zeolite inorganic antibacterial agent 8kg, heat stabilizer Ca-Zn 20kg, R-paper sugar 8kg, and processing aid 10kg were mixed, heated to 60℃, and then mixed with 1,000kg of vinyl chloride resin with a polymerization degree of 1,000. 40 kg of the acrylic impact modifier of Example 2, 5 kg of the silicone impact modifier of Example 3, 20 kg of CPE impact modifier, and 30 kg of CaCO ₃ were added, and the mixture was heated to 130°C for 20 minutes, followed by cooling at room temperature.

Multilayer Coextrusion Produce

In a multilayer co-extrusion machine, two extruders were installed so that the outer layer, the middle layer, and the inner layer had the same thickness (i.e., the thickness ratio was 1:1:1), and the number of screw rotations of each extruder and the A synchronization system was established to make the flow equal to the difference between the cylinder temperature and the number of revolutions.

Multi-layer coextrusion in which the resin composition constituting each layer is naturally melted in the coex mold through the above-described interlocking system, and the triple-wall structure forms a smooth shape like a single layer, and the interval between the three layers is uniformly formed. Through the construction method, a multi-layer rigid polyvinyl chloride seismic water and sewage pipe with a triple wall structure was manufactured.

In the case of extrusion molding in a multi-layer co-extrusion machine, a triple-walled water and sewage pipe was fabricated so that the mold was corrugated and the interface between the center layer and the inner and outer layers was corrugated.

Claims (7)

A resin composition for multi-layer hard polyvinyl chloride seismic water and sewage pipes,
The multi-layer rigid polyvinyl chloride seismic water and sewage pipe includes an outer layer, an intermediate layer, and an inner layer from the outside,
The synthetic resin composition of the outer layer and the inner layer is a core-shell type acrylic impact modifier coated with an outer lubricant having a melting point of 90°C or higher, core-shell type silicone impact modifier, or core-shell type CPE impact per 100 parts by weight of vinyl chloride resin with a polymerization degree of 800 to 1,200. 4 to 10 parts by weight of two or more impact modifiers selected from reinforcing agents, 2 to 6 parts by weight of filler, 0.5 to 2.5 parts by weight of processing aid, 2.5 to 3.5 parts by weight of heat stabilizer, and 0.5 to 1.0 parts by weight per R-paper,
The synthetic resin composition of the intermediate layer is a core-shell type MBS-based impact modifier and a core-shell type CPE impact modifier coated with an external lubricant having a melting point of 90°C or higher per 100 parts by weight of a vinyl chloride resin having a polymerization degree of 1,200 to 2,000. Including 4 to 10 parts by weight of an impact modifier mixed with 0, 2 to 6 parts by weight of a filler, 0.5 to 2.5 parts by weight of a processing aid, 2.5 to 3.5 parts by weight of a heat stabilizer, and 0.5 to 1.0 parts by weight per R-paper,
Multi-layer rigid polyvinyl chloride seismic resin composition for water and sewage pipes. According to claim 1, wherein the content of the heat stabilizer contained in the synthetic resin composition of the outer layer and the inner layer is 3.0 to 3.5 parts by weight, multi-layer rigid polyvinyl chloride seismic resin composition for water and sewage pipes. According to claim 1, The content of the impact modifier contained in the synthetic resin composition of the outer layer and the inner layer is 6 to 10 parts by weight, multi-layer rigid polyvinyl chloride seismic resin composition for water and sewage pipes. According to claim 1, wherein the synthetic resin composition of the intermediate layer comprises a polyvinyl chloride resin having a polymerization degree of 1,500 to 2,000, a multi-layer rigid polyvinyl chloride seismic resin composition for water and sewage pipes. A multi-layer rigid polyvinyl chloride seismic water and sewage pipe prepared by the composition of any one of claims 1 to 4. As a method of manufacturing a multilayer rigid polyvinyl chloride seismic water and sewage pipe,
A blending step of blending the composition of any one of claims 1 to 4;
Extrusion step of extrusion molding water and sewage pipes using the blended composition; And
A knitting step of knitting the extruded water and sewage pipes;
Containing,
Method for manufacturing multi-layer rigid polyvinyl chloride seismic water and sewage pipes. According to claim 6, In the extrusion step, the temperature of the extrusion cylinder is 180 ℃ to 190 ℃, the temperature of the die block is 170 ℃ to 175 ℃, the temperature of the die is 200 ℃ to 210 ℃,
Method for manufacturing multi-layer rigid polyvinyl chloride seismic water and sewage pipes.