KR100386969B1 - The method for manufacturing and Unsaturated Polyester Mortar - Google Patents

Abstract

The present invention relates to a polymer mortar comprising an unsaturated polyester resin, which is used as a construction material such as flooring, packaging repair, anticorrosive lining, adhesive, and precast product, because of excellent mechanical properties, durability, and chemical resistance.

As a binder, 16 parts by weight of orthophthalate-based unsaturated polyester, 16 parts by weight of filler, 68 parts by weight of aggregate, 10 to 50 parts by weight of polystyrene resin (PS), 10 to 50 parts by weight of polystyrene (EPS) / polystyrene resin (PS) The present invention relates to an unsaturated polyester mortar which is mixed with 1 part by weight of methyl ethyl ketone peroxide, prepared in a mold mold, and cured at 20 ° C., and a method for producing the same.

Description

Unsaturated polyester mortar and its manufacturing method {The method for manufacturing and Unsaturated Polyester Mortar}

Since the present invention is excellent in mechanical properties, durability, chemical resistance, etc., unsaturated polyester mortar made of a binder of unsaturated polyester resins used as construction materials, such as flooring materials, packaging repair materials, anticorrosive lining agents, adhesives, and precast products, and their preparation It is about a method.

In general, the hardening shrinkage of unsaturated polyester mortar or concrete is very large, causing cracks or internal stresses in the matrix, which may cause problems such as adhesion amount or dimensional instability. Therefore, the means for preventing this hardening shrinkage are being researched by unsaturated polyester (UP) producers and academia, but they have not been able to achieve clear results. Especially, the development of low-shrinkage UP for room temperature curing is difficult. It remains. Means for preventing hardening shrinkage include inorganic fillers, mixing of thermoplastic resins, heat curing, and the like. The incorporation of the thermoplastic resin utilizes the action of the thermoplastic resin, which is present in the undispersed (about 0.5 micron) state in the polyester, causes expansion and filling action upon curing to compensate for shrinkage accompanying the curing of the polyester.

In order to solve the problems described above, the present invention by mixing a thermoplastic styrene resin with a thermosetting unsaturated polyester resin styrene resin in the curing mechanism of the unsaturated polyester resin causes a shrinkage-complementary effect of UP mortar The purpose of the present invention is to provide an unsaturated polyester mortar and a method for producing the same, which reduce hardening shrinkage, and in which the styrene resin used in the present invention is liquefied waste foamed polystyrene with a styrene monomer, which can recycle resources. It is.

In order to achieve the above object, the present invention uses orthophthalate, unsaturated polyester (UP) resin, and styrene monomer (Styrene Monomer: SM. (Specific gravity 0.906)) to dissolve styropol. The catalyst is methyl ethyl ketone peroxide (MEKPO), the filler is calcium carbonate (CaCO ₃ ), the aggregate is standard sand and silica sand, expanded polystyrene (expanded polystyren). : EPS; Density: 15 kg / m 3) Unsaturated Polyester Mortar and Unsaturated Polyester Concrete.

As the binder used in the present invention, orthophthalate-based and unsaturated polyester (UP) resins for general molding were used, and their properties are shown in Table 1.

Table 1 Properties of Unsaturated Polyester Resin

Specificgravity (20 ℃) acid value Viscosity (20m ℃ .Pa · s) Gel time (min.) 1.12 ± 0.02 23 ± 4 125 12.4

As the solvent, styrene monomer was dissolved using 99.0% of styrene monomer (Styrene Monomer: SM., Specific gravity 0.906).

The catalyst used was methyl ethyl ketone peroxide (MEKPO).

Filling and Aggregate

The filling material used heavy calcium carbonate (CaCO ₃ ), and the aggregate used standard sand and silica sand. Table 2 shows the general properties of heavy calcium carbonate.

Table 2 Properties of Calcium Nitrate

Specificgravity Unit weight Surface area (㎠ / g) Water content (%) 2.7 0.984 2,500 ≤0.1

Expanded Polystyren (EPS) (density: 15 kg / m 3) used building insulation generated as construction waste.

Hereinafter, the present invention will be described in detail through examples.

Example 1

16 parts by weight of orthophthalate-based unsaturated polyester, 16 parts by weight of calcium carbonate, 68 parts by weight of aggregate, and 1 part by weight of methyl ethyl ketone peroxide were mixed into a mold mold and cured at a temperature of 20 ° C. for a predetermined period. (Description: Curing period varies slightly depending on the type of experiment)

The curing method was cured for 24 hours at 20 ℃. (The curing period varies depending on the test item. The strength test is performed after curing for 24 hours at 20 ℃.)

The manufacturing process is as follows.

Styropol Grinding (20 ~ 40mm)-Styropol Dissolution-UP Blending-Addition of Catalyst-Stirring-Molding-Curing

Example 2

16 parts by weight of orthophthalate-based unsaturated polyester, 16 parts by weight of calcium carbonate, 68 parts by weight of aggregate, and 10 parts by weight of polystyrene resin (PS) were mixed with 1 part by weight of methyl ethyl ketone peroxide, and placed in a mold mold. Cured after the manufacture.

Example 3

As the binder, methyl ethyl ketone (16 parts by weight of orthophthalate-based unsaturated polyester, 16 parts by weight of calcium carbonate, 68 parts by weight of aggregate, 10 parts by weight of polystyrene resin (PS), 10 parts by weight of expanded polystyrene (EPS) / polystyrene resin (PS)) 1 part by weight of peroxide was mixed into a mold mold and cured at 20 ° C. after manufacture.

Example 4

16 parts by weight of orthophthalate-based unsaturated polyester, 16 parts by weight of calcium carbonate, 68 parts by weight of aggregate, 10 parts by weight of polystyrene resin (PS), expanded polystyrene resin (EPS)) and 20 parts by weight of polystyrene resin (PS) 1 part by weight of ethyl ketone peroxide, and mixed in a mold mold was prepared after curing at 20 ℃.

Examples 5-26

Prepared by the same production method as Example 4, the composition and composition ratio are as shown in Table 3.

Table 3 Formulation Table of Polymer Mortar

Example [EPS / PS] (parts by weight) [PS / UP] (part by weight) Binder (UP) (parts by weight) Filling material (part by weight) Aggregate (parts by weight) Example 1 0 0 16 16 68 Example 2 0 10 Example 3 10 Example 4 20 Example 5 30 Example 6 50 Example 7 0 20 Example 8 10 Example 9 20 Example 10 30 Example 11 50 Example 12 0 30 Example 13 10 Example 14 20 Example 15 30 Example 16 50 Example 17 0 40 Example 18 10 Example 19 20 Example 20 30 Example 21 50 Example 22 0 50 Example 23 10 Example 24 20 Example 25 30 Example 26 50

Experimental Example 1 (Production and Curing Method of Sample)

In the experiment, the mixing ratio of the polymer mortar was 16 parts by weight of the binder, 16 parts by weight of calcium carbonate (100%), and 68 parts by weight of the aggregate, and the addition ratio of the polystyrene resin (PS) was used as the binder ( UP) to 0, 10, 20, 30, 40, 50 parts by weight. Dissolution of styropol was carried out in a 70 ℃ constant temperature water bath and EPS / PS was 0, 10, 20, 30, 40, 50 parts by weight. The mold strength of 40 × 40 × 160 mm for the compressive strength and flexural strength test and 75 × 100 × 400 mm for the hardening shrinkage test were used respectively, and the air curing (20 ℃, 50% R · H) was performed for a predetermined period after the sample was manufactured. Was carried out. Here, the catalyst used 1% of the binder amount.

Viscosity Measurement of Resin:

The viscosity of the polyester resin to which the polystyrene resin was added was measured using the Brockfield viscometer. The measurement was carried out at a resin temperature of 20 ° C. constant temperature.

UP resins can be used to increase the viscosity by using chemical centering methods, or they can be reduced by adjusting the molecular weight of resins or adding diluents. In the development of polymer mortar and concrete as construction materials, low viscosity with good workability Since the resin is required, commercially available UP resins contain about 30 to 40 parts by weight of styrene monomers, which are reactive diluents, in order to lower the viscosity. However, excessive addition of styrene monomer affects the degree of addition, and therefore, an appropriate adjustment of the amount of addition is necessary. Table 2 shows the viscosity of the binder according to the EPS / PS ratio and PS / UP ratio. The viscosity of the resin is EPS

When the / PS ratio was 50 parts by weight, high viscosity was shown. The impact of increased PS / UP ratio

The low-density PS resin, whose EPS / PS ratio was below 30 parts by weight, tended to decrease, but increased when the EPS / PS ratio was higher.

Table 4. Viscosity of binder according to EPS / PS ratio and PS / UP ratio

Slump-flow test:

The slump test was conducted according to KS F 2474 (method of slump test of polymer cement mortar), and at the same time, the flow value was also measured.

Table 3 shows the slump of the UP mortar, and Table 4 shows the result of measuring the flow. The slump and prowe of UP mortar showed little change depending on the EPS / PS ratio, and the effect of PS / UP ratio was shown to be large. Unlike the results of the previous viscosity measurement, the PS / PS ratio was higher than 30 parts by weight. The slump-flow value tends to increase as the UP ratio increases because the relative amount of resin (UP · PS) that influences the flow of mortar increases.

Table 5. Slump according to EPS / PS ratio and PS / UP ratio

Table 6. Flow according to EPS / PS ratio and PS / UP ratio

Usable time measurement:

The usable time of UP mortar was conducted at curing temperature of 20 ° C. according to KS F 2484 (Measurement of Usable Time of Polyester Resin Concrete, Tactile Method).

The usable time of UP mortar and concrete is greatly changed by the composition of resin, curing temperature, initiator, type of accelerator and usage. Therefore, the working hours can be adjusted by changing these conditions, which are usually used between 10 and 60 minutes. Table 5 shows that the EPS / PS ratio and the PS / UP ratio increase, that is, the length increases as the amount of styrene monomer in the binder increases, but decreases slightly as the EPS / PS ratio increases.

Table 7. Available time according to EPS / PS ratio and PS / UP ratio

Flexural and compressive strength test:

For flexural strength test, KS F 2482 (Test method for flexural strength of polyester resin concrete), and for compressive strength test, specimens were divided into two parts after flexural strength test.

Compression strength of UP mortar:

Table 6 shows the compressive strength of UP mortar according to EPS / PS ratio and PS / UP ratio. The compressive strength of UP mortar and concrete is also affected by the binder content. In this experiment, the change of compressive strength due to increase / decrease of EPS / PS ratio was very small. As the PS / UP ratio was increased, that is, the amount of PS added to the binder (UP) was increased, It was found to decrease. Especially, when the PS / UP ratio is 40 parts by weight or more, the decrease was large. This is because the surplus polymer of the styrene monomer, which is a thermoplastic resin, is mixed in the cured product, and it is considered that the relative amount of UP that can dominate the strength of the UP mortar is reduced.

Table 8. Compressive strength according to EPS / PS ratio and PS / UP ratio

Flexural strength of UP mortar;

Table 7 shows the flexural strength of UP mortar according to EPS / PS ratio and PS / UP ratio. The UP mortar flexural strength tended to be similar to the compressive strength stated. The flexural strength of UP mortar also showed little change according to the EPS / PS ratio, and showed a slight decrease in strength as the PS / UP ratio increased, especially when the PS / UP ratio was 40 parts by weight or more. appear.

Table 9 Flexural Strength According to EPS / PS Ratio and PS / UP Ratio

Hardening Shrinkage Test:

Shrinkage by curing of the sample was measured as the length change rate using the dial gauge at the center of both ends of the 75 × 100 × 400 mm sample. The cure shrinkage was measured every hour until 40 hours when the catalyst (MEKPO) was incorporated into the binder and there was little change in shrinkage due to cure.

Table 8 shows the curing shrinkage rate according to the EPS mortar ratio and PS / UP ratio of the UP mortar. Although the hardening shrinkage of the plain mortar was 54.5 × 10 ^-4 , the shrinkage reduction effect of up to 13.62 × 10 ^-4 was obtained as the amount of styropol solution added increased. It is shown that the styrene resin is expanded by the heat generated during the UP curing process and has a contractile complementary action. The effect of the EPS / PS ratio on the shrinkage was greatest when the PS / UP ratio was 30 to 40 parts by weight, and the shrinkage reduction effect with the increase of the PS / UP ratio was remarkable when the EPS / PS ratio was more than 30 parts by weight. Can be.

Table 10. Hardening shrinkage rate according to EPS / PS ratio and PS / UP ratio

Study on Shrinkage Reduction and Strength of Unsaturated Polyester Resin Mortar

1) Viscosity measurement of unsaturated polyester resins incorporating polystyrene resin showed that the viscosity increased with increasing EPS / PS ratio. However, when the EPS / PS ratio is less than 30%, the viscosity is significantly lower than that of the original UP resin. The manufacture of the defect material which has favorable workability is possible.

2) The use time of UP mortar incorporating PS resin showed stable distribution between 45 and 65 minutes.

3) The bending and compressive strength of the UP mortar was more affected by the PS / UP ratio than the EPS / PS ratio and decreased with the increase of the PS / UP ratio, but less than 30% of the PS / UP ratio. Was incomplete.

4) As the EPS / PS ratio is more than 10% and the PS / UP ratio is more than 20%, the hardening shrinkage rate is significantly lower than that of UP mortar.

5) A comprehensive review of the proper workability, flexural and compressive strength characteristics, and hardening shrinkage rate showed that the optimum mixing condition was 30% EPS / PS ratio and 30% PS / UP ratio.

As described above, in the present invention, incorporation of the thermoplastic resin causes expansion and filling of the thermoplastic resin present in the undispersed state (about 0.5 μ) in the polyester to compensate for shrinkage accompanying curing of the polyester. Because of its excellent mechanical properties, durability, and chemical resistance, it has the effect of being applied to construction materials such as flooring, pavement repair, anticorrosive lining, adhesives, and precast products.

Claims (3)

In the manufacturing method of unsaturated polyester mortar (Unsaturated Polyester Mortar), 16 parts by weight of orthophthalate-based unsaturated polyester, 16 parts by weight of calcium carbonate, 68 parts by weight of aggregate, polystyrene resin (PS) 10-50 parts by weight, foaming 10 to 50 parts by weight of polystyrene (EPS) / polystyrene resin (PS) is mixed with 1 part by weight of methyl ethyl ketone peroxide, and put into a mold mold and prepared at 20 ° C. The method of producing unsaturated polyester mortar. In Unsaturated Polyester Mortar, as a binder, 16 parts by weight of orthophthalate-based unsaturated polyester, 16 parts by weight of calcium carbonate, 68 parts by weight of aggregate, 10 to 50 parts by weight of polystyrene resin (PS), expanded polystyrene (EPS) / Polystyrene resin (PS) fluorinated polyester mortar, characterized in that it is composed of 10 to 50 parts by weight and 1 part by weight of methyl ethyl ketone peroxide. delete