KR20050067115A - Polymer concrete binder and mortar using complex waste plastic - Google Patents

Abstract

The present invention is a binder composition for mortar and polymer concrete using composite waste plastics, and more specifically, by adding a diethyl acrylate modifier to an unsaturated polyester resin, it is possible to manufacture a binder of the branch figure to minimize the amount of binder. At the same time, the effect of temperature is small and it can be applied under water. The workability is good and the curing time is fast, so the work can be done efficiently. The aggregate, even when polymer concrete and mortar can be mixed uniformly, the compressive, tensile and bending strength Disclosed is a waste plastic and polyester binder composition for diacrylate modified polymer concrete and mortar capable of producing high products.

Description

Polymer concrete binder and mortar using composite waste plastic

In general, concrete is a fine aggregate and coarse aggregate is used as the cement is produced by filling and bonding the cement paste obtained by the hydration reaction between the aggregate and the aggregate.

Although concrete and mortar are widely used in various civil engineering and construction fields, they have low freeze-thawing resistance, chemical resistance, and water tightness, and resistance to corrosion and alkali aggregate reaction due to shrinkage, corrosion, adhesion, neutralization, or penetration of chloride ions. It has this weak drawback.

Therefore, in order to solve the above problems, researches on polymer mortar and concrete that do not use cement as a binder of concrete have been actively conducted in recent years.

Polymer concrete and mortar have higher mechanical properties such as compression, tensile and flexural strength than general cement mortar and concrete, and can control pot life and hardening time in a wide range. And excellent wear resistance and excellent adhesion to various materials such as concrete, stone, metal, wood, and glass.

However, in the case of the polymer concrete and mortar as described above, it is difficult to produce a polymer concrete and mortar having a predetermined workability and strength because the appropriate mixing ratio of filler, aggregate and binder according to the intended use is not established, and the expensive polymer is indiscriminately discriminated. It has a problem that the manufacturing cost is increased by using.

Therefore, in order to solve the above problems, composite waste plastic pellets are used as fine aggregate, and the viscosity is low and good workability in unsaturated polyester resin as a binder. By shortening the process time and reducing the addition amount of the binder to reduce the expensive binder to produce a polyester binder composition for diethyl acrylate modified polymer concrete and mortar bringing the cost saving effect.

Therefore, in order to solve the above problems, the unsaturated polyester resin, which is a binder, has low viscosity and good workability, and is well mixed between compositions, which enables strength expression, and shortens the curing time by shortening the curing time even at low temperatures and in water. The present invention provides a polyester binder composition for mortar using composite waste plastic pellets as diethyl acrylate-modified polymer concrete and fine aggregate, which reduces the amount of additives and reduces the costly binder.

(Manufacture example 1)

A polyester binder was prepared in which 20% by weight of polystyrene oligomer was mixed with 40% by weight of styrene-containing unsaturated polyester resin, and 1.5% by weight of methyl ethyl ketone peroxide was added to the resin as a curing initiator.

10% polyester binder prepared as described above and 15% by weight of heavy calcium carbonate as a filler 25% by weight of silica sand having an average particle diameter of 0.2mm, and 50% by weight of silica sand having a maximum particle size of 4.7 mm or less were sufficiently mixed with a forced mixer. An unsaturated polyester polymer mortar was used as Preparation Example 1.

(Manufacture example 2-manufacture example 5)

The unsaturated polyester resin containing 20% by weight of polystyrene oligomer and the diethyl acrylate modifier were mixed as shown in Table 1 below with respect to the unsaturated polyester resin containing 40% by weight of styrene, and methyl ethyl ketone peroxide was used as a curing initiator. Was added 1.5% by weight of the resin to prepare a diethyl acrylate modified polyester binder.

10% by weight of the polyester binder prepared as described above and 15% by weight of heavy calcium carbonate as a filler, 25% by weight of silica sand having an average particle diameter of 0.2 mm, 30% by weight of silica sand having a maximum particle size of 4.7 mm or less, and waste plastic weight of alumina and titania fine powder An unsaturated polyester polymer mortar prepared by sufficiently mixing 20% by weight of waste plastic pellets having an average particle diameter of 4.0 mm added with 5% of a comparative amount with a forced mixer was prepared as Preparation Example 2-5.

(Example 1)

The viscosity of the binder used in Preparation Example 1 Preparation Example 5 was measured in 20 ° C., and is shown in Table 1 below, and the flow and compression of the unsaturated polyester polymer mortar prepared by the method of Preparation Example 1 Preparation Example 5, respectively, was performed. Strength, tensile strength and flexural strength were measured in the following manner and shown in Table 1.

(Viscosity test)

Viscosity measurements for the polyester binder were carried out with a cylinder-shaped cylinder-mounted low viscosity VT-03 and a high viscosity VT-04 viscosity tester. The viscometer was measured as the value to appear on the scale by the rotation of the cylinder in the sample solution having a viscosity, the higher than this based on 330mPa · s was measured for high viscosity, the following was measured for low viscosity.

(Flow test)

The flow value, which is a measure of the workability of the polymer mortar, was measured by KS L 5105.

(Compression, tensile, flexural strength test)

-Production of specimens

After molding the polymer mortar prepared in Preparation Example 1-5 into a cylindrical mold for preparing a specimen of 7.5 cm in diameter and 15 cm in length according to the method of fabricating the strength test specimen of polyester resin concrete of KS F 2419, the temperature was capped after capping the upper surface. Cylindrical specimens for compressive strength test were prepared by air curing for 7 days while maintaining 25 ± 3 ℃, 60% humidity.

- Test Methods -

Compression, tensile and flexural strength tests were measured according to KS F 2481, KS F 2480 and KS F 2482.

Table 1

(Manufacture 6)

A diethylacrylate-modified polyester binder was prepared by mixing 20% by weight of polystyrene oligomer with respect to 40% by weight of styrene-containing unsaturated polyester resin and 30% by weight of diethylacrylate modifier with respect to unsaturated polyester resin. It was.

(Example 2)

The binder used in Preparation Example 1 and the binder prepared in Preparation Example 6 show the respective values by measuring the viscosity while changing the temperature as shown in Table 2. As shown in Table 2, when the diethyl acrylate modifier is added to the unsaturated polyester resin, the change of viscosity with temperature is small, especially low viscosity can be maintained even at low temperatures, and aggregates can be uniformly mixed during operation. It may have a uniform strength.

TABLE 2

(Example 3)

The early strength of the polymer mortar prepared according to Preparation Example 1 and the polymer mortar prepared according to Preparation Example 6 was measured at 20 ° C. ± 2, and is shown in Table 3 below. As shown in Table 3, in Preparation Example 6, in which a diethyl acrylate modifier and waste plastic pellets were mixed, as compared with Preparation Example 1 made of unsaturated polyester resin, it was found that the early strength was high depending on the curing time. . Therefore, it will be possible to express the performance early when the polymer concrete product is manufactured or used in maintenance reinforcement work in Korea-China.

(Example 4)

The flexural strength in water was measured for the polymer mortar prepared according to Preparation Example 1 and the polymer mortar prepared according to Preparation Example 6, and is shown in Table 4. Underwater flexural bond strength test was carried out in accordance with KS F 2482 to 6 × 6 × 24 cm molding mold by preliminary deposition of 6 × 6 × l 2 cm section of mortar of general cement mortar in water and prepared according to Preparation Example 1 and Preparation Example 6 The polymer mortar was poured in water and cured for 7 days at a temperature of 20 ° C. ± 2, and then the flexural adhesive strength was measured. As shown in Table 4, the flexural strength of the polymer mortar mixed with the diethyl acrylate modifier is greatly improved, and thus it can be easily used for repairing various structures in the water.

TABLE 3

Table 4

By adding diethyl acrylate modifier to unsaturated polyester resin and waste plastic pellets for aggregate, it is possible to manufacture low viscosity binders, minimize the amount of binders and at the same time, the effect of temperature is small and applicable in water In addition, the workability is good and the hardening time is fast, so that the work can be efficiently performed, and the aggregate can be uniformly mixed even in the manufacture of polymer concrete and mortar, so that a product having high compression, tensile and bending strength can be manufactured.

Claims (4)

In the polyester binder composition for modified polymer concrete and mortar using a unsaturated polyester resin containing styrene as a material, 95 to 95% by weight of the unsaturated polyester resin containing styrene and 5 to 60% by weight of the diethyl acrylate modifier. Diethyl acrylate modified polyester mortar and binder composition for concrete, characterized in that The binder composition for diethyl acrylate-modified polyester mortar and concrete according to claim 1, wherein 5 to 20% by weight of polystyrene oligomer is added to the amount of unsaturated polyester resin. The binder composition for diethylacrylate-modified polyester mortar and concrete according to claim 1, wherein 5 to 40% by weight of waste plastic pellets are added to the unsaturated polyester polymer mortar. The binder composition for diethylacrylate-modified polyester mortar and concrete according to claim 3, wherein 0.5 to 10% by weight of alumina or titania fine powder is added to the waste plastic pellets.