KR101614073B1 - Fireproof polyurea coating composition - Google Patents

Abstract

The present invention relates to a flame retardant polyurea coating composition, which comprises 100 parts by weight of a prepolymer prepared by prepolymerizing an isocyanate having an NCO content of 15 to 16 (% by weight) and 5 to 10 parts by weight of a TCE 2 -chloroethyl phosphate flame retardant And the like.
Thus, when the flame retardant is bonded to the isocyanate to realize the polyurea coating composition, the coating composition is provided with flame retardant components such as phosphorus, nitrogen, and halogen which are elements that block oxygen when a fire occurs, The phosphorus element plays a role of retarding the reactivity to a certain extent, so that the problem that dust adheres to the coating film due to appearance when the coating film is formed can be prevented.
Further, the durability of the coating film can be improved, and the stability and life of the structure can be extended.

Description

FIREPROOF POLYUREA COATING COMPOSITION [0001] FIELD OF THE INVENTION [0001]

The present invention relates to a flame retardant polyurea coating composition.

The urea bond-forming coating, which is bound by a polyurea bond, namely the -NCO- group of isocyanate and the -NH- group of amine, is called polyurea because it reacts very quickly, As related coating materials, related arts have been disclosed in Korean Patent Laid-Open Publication No. 10-2009-0028332 (published on March 18, 2009).

Polyurea coatings have superior mechanical properties compared to other paints such as epoxies and polyurethanes, and since they are of the fastest speed type, coatings are formed within a few seconds, and they are not sensitive to working conditions compared to other paints. It is progressing.

However, when a fire occurs, the polyurea coating material has a fatal problem that the polyurea coating itself melts and discharges a large amount of toxic gas such as carbon monoxide to cause not only property damage but also personal injury and even air pollution.

Accordingly, there is a demand for the development of a flame retardant polyurea coating composition that not only has excellent mechanical properties but also has flame retardant performance.

The object of the present invention is to solve the above problems, and an object of the present invention is to provide a flame retardant effect by combining halogenated phosphorus flame retardant with isocyanate and polyol and to improve the durability of the coating film, And a flame-retardant polyurea coating composition.

The object is achieved according to the present invention by subjecting 100 parts by weight of a prepolymer prepared by prepolymerizing an isocyanate having an NCO content of 15 to 16 (% by weight) and 5 to 10 parts by weight of a TCE 2 -chloroethyl phosphate flame retardant A main agent, and a flame retardant polyurea coating composition.

Here, the flame retardant polyurea coating composition further comprises a curing agent.

Also, the curing agent may include: 60 to 70 parts by weight of a polyetheramine having a molecular weight of 2,000; 10-15 parts by weight of a polyetheramine having a molecular weight of 5,000; 10 to 15 parts by weight of polydiethyl toluene diamine (Diethytoluenediamine); 1 to 2 parts by weight of an adhesion promoter; 0.5 to 1 part by weight of an antifoaming agent; And 3 to 5 parts by weight of a colored pigment; .

Preferably, the subject and the curing agent are in a 1: 1 volume ratio reaction.

As described above, the present invention has the following effects.

First, by incorporating a flame retardant into an isocyanate to realize a polyurea coating composition, the coating composition is provided with a flame retardant property by mixing flame retardant components such as phosphorus, nitrogen, and halogen which are elements that block oxygen when a fire occurs.

Second, the phosphorus element as a constituent of the flame retardant plays a role of retarding the reactivity to some extent, so that the problem of dust adhering to the coat due to apparent dust formation during the formation of the coat can be prevented.

Hereinafter, the flame retardant polyurea coating composition according to the present invention will be described in detail.

Prior to this, the terms used in the specification and claims should not be construed in a dictionary sense, and the inventor may, on the principle that the concept of a term can be properly defined in order to explain its invention in the best way And should be construed in light of the meanings and concepts consistent with the technical idea of the present invention.

Therefore, the embodiments described herein are merely preferred embodiments of the present invention, and not all of the technical ideas of the present invention are expressed, so that various equivalents and modifications are possible at the time of filing of the present application It should be understood.

The flame retardant polyurea coating composition according to the present invention can be produced by adding TCEP (Tris 2 -chloroethylphosphate), which is a flame retardant, to a prepolymer solution prepared by prepolymerizing an isocyanate having -NCO- group with polypropylene glycol And a coating composition may be prepared by adding a hardener to the subject.

Here, the curing agent is prepared by a solution comprising polyetheramines, diethytoluenediamine, adhesion promoter, antifoaming agent, colored pigment, etc. having different molecular weights and functional groups having -NH- groups, (Coating film) having a flame retardant performance can be formed by spraying using a spray-type two-component spray coating machine.

In addition, a coating film is formed in a fast curing type of a non-catalytic reaction between an isocyanate having a -NCO- group and a polyether amine having an -NH- group, and a coating film of a -NCO- group of a isocyanate and a polyol- OH-group is converted into prepolymer and TCEP (Tris 2 -chloroethyl phosphate) is bonded to the residual amount -NCO- group, resulting in a flame retardant effect due to halogen and phosphorus. When flame retardant is added to isocyanate which is the subject of polyurea, it is mixed with substances that act to block oxygen when a fire occurs, thereby preventing burning of the film.

Accordingly, when the coating composition according to the present invention is used as a waterproofing material or a flooring material with a polyurea coating material, a quick-setting curing type flame retardant polyurea coating film is formed, thereby enhancing the reliability of extending the life of concrete and steel structures.

The present invention also relates to a flame retardant composition comprising a flame retardant TCEP (Tris 2-chloroethyl phosphate) bonded to a solution prepared by prepolymerizing an isocyanate having -NCO- group which influences the mechanical properties (tensile strength, elongation and flame retardancy) 60 to 70 parts by weight of a polyetheramine having a molecular weight of 2,000 and a main chain of a coating film and 10 to 15 parts by weight of a polyetheramine having a molecular weight of 5,000 for increasing the reaction time and tensile strength of the coating film, (Chain extender) having a net network structure between the weight part and the main reaction chain, 10 to 15 parts by weight of polydiethyl toluene diamine and adhesion promoting agents 1 to 2 0.5 to 1 part by weight of a defoaming agent which imparts a beautiful appearance without smoothing the surface without bubble marks on the coating film and a coloring pigment And 3 to 5 parts by weight of a mixed solution curing agent is sprayed using a mixed impingement type two-component spray coating machine at a high temperature and a high pressure in a mixing ratio of 1: 1 with the above-mentioned subject in a volume ratio, thereby forming a hardened polyurea coating film.

Hereinafter, a method of manufacturing the fast cure type flame retardant polyurea coating composition according to the present invention will be described in detail.

The present invention relates to a rapid cure type polyurea coating composition using TCE 2 (Tris 2 -chloroethylphosphate) which is a flame retardant, and isocyanate-modified polyurethane coating composition having -NCO- group as a main agent that affects reactivity, tensile strength, The prepolymerized solution is composed of a flame retardant-bound substance and a polyetheramine-containing curing agent having different molecular weights among the highly reactive amine groups capable of reacting within a few seconds.

The prepolymer solution has 100 parts by weight of isocyanate having 15 to 16% by weight of NCO%. The NCO% of the prepolymer solution is a value that determines physical properties such as tensile strength, hardness, elongation and reaction rate of the coating film. When the content of -NCO- is greater, the coating film hardness, tensile strength and reactivity (speed) are increased. When the -NCO- group content is lower, the elongation percentage of the coating film is increased and the hardness is lowered. Was used. In order to impart flame retardancy to the solution, 5 to 10 parts by weight of TCEP, which is a flame retardant, was added to prepare a subject.

If the amount of TCE 2 -chloroethyl phosphate (TCEP) is less than 5 parts by weight, which is a flame retarding effect of the subject, little flame-retardant effect is obtained, so that the coating film easily melts when burned and poisonous gas generation and transfer are easy. When the amount is more than 10 parts by weight, But the mechanical properties such as tensile strength, tear strength and hardness are decreased, which results in lowering the basic properties of the waterproofing material and the flooring material. Therefore, it is best to add the flame retardant (TCEP) within the range of 5 to 10 parts by weight.

60 to 70 parts by weight of a polyetheramine having a molecular weight of 2,000 and 10 to 15 parts by weight of a polyetheramine having a molecular weight of 5,000 to determine the tensile strength of the polyurea coating film, 10 to 15 parts by weight of polydiethyl toluene diamine, which determines the tensile strength, reactivity and hardness, to form the network structure of the weight and the main chains, 1 to 2 parts by weight of an adhesion promoter for increasing the adhesion to the base paper, 0.5 to 1 part by weight of an antifoam agent which smoothes the surface without bubbles and gives a colorful aesthetic appearance and 3 to 5 parts by weight of a color pigment are added to give a color of a coating film and stirred sufficiently at 1,000 to 2,000 rpm for 1 to 2 hours do.

If the addition amount of the polyetheramine having a molecular weight of 2,000 to determine the tensile strength and the reaction rate of the polyurea coating film in the curing agent is less than 60 parts by weight, the tensile strength of the coating film is lowered. When the amount is more than 70 parts by weight, The reaction speed is accelerated so that the coating film is formed before leveling so as to exert the adhesion force with the surface, and the adhesion force is rapidly lowered. Therefore, it is best to add within the range of 60 to 70 parts by weight.

If the addition amount of polyetheramine having a molecular weight of 5,000 to determine the tear strength of the polyurea coating film is less than 10 parts by weight, the coating tears easily. If the addition amount exceeds 15 parts by weight, the tearing strength is increased. However, Or less), it is best to add it within the range of 10 to 15 parts by weight.

Further, when the addition amount of polydiethyl toluene diamine (Diethytoluenediamine), which determines the tensile strength, reactivity and hardness, is less than 10 parts by weight, the tensile strength and hardness of the coating film are decreased due to the slow reactivity If the amount is more than 15 parts by weight, the adhesive force with the base paper surface is remarkably decreased due to the rapid reactivity. Therefore, it is best to add the polydiethyltoluenediamine within the range of 10 to 15 parts by weight.

Also, the adhesion promoter may be a silane coupling agent such as Gamma-methacryloxypropyltrimethoxysilane, Gamma-glycidoxypropyltrimethoxysilane, beta - (3,4-epoxycyclohexyl (- (3,4-epoxycyclohexyl) ethyltrimethoxysilane). When the amount is less than 1 part by weight, the adhesive strength is lowered. When the amount is more than 2 parts by weight, have. Therefore, it is best to add the adhesion promoter within the range of 1 to 2 parts by weight.

Further, the antifoaming agent acts to remove the air bubbles on the surface of the polyurea coating film to improve the appearance of the coating film and the abrasion resistance, and it is preferable to select either a silicone system or a non-silicone system. If the amount of the defoaming agent is less than 0.5 part by weight, it is difficult to remove the bubbles in the solution, so that a large number of bubble marks appear on the appearance and the appearance becomes poor. When the amount exceeds 1 part by weight, It is best to add the antifoaming agent within the range of 0.5 to 1 part by weight.

Also, it is preferable that at least one of the colored pigments is selected from the colored pigments as an organic or inorganic pigment and added in an amount of 3 to 5 parts by weight. If the amount of the colored pigment is less than 3 parts by weight, the coating of the polyurea coating layer may show a rough surface due to poor hiding power. If the amount of the pigment exceeds 5 parts by weight, the viscosity of the curing agent may increase. Therefore, it is preferable that the colored pigment is added in the range of 3 to 5 parts by weight.

A process of forming a coating layer on a substrate (steel, concrete) using the flame retardant polyurea coating composition according to the present invention will be described as follows.

First, when the flame retardant polyurea is coated on the steel surface, the blasting pretreatment is carried out in order to remove contaminants and existing rusts on the surface and the primer is coated to improve the interlaminar adhesion between the substrate and the polyurea coating surface, followed by coating with a flame retardant polyurea . In the case of concrete, the concrete is hardened by the hydration reaction, and the water is raised on the surface, resulting in the formation of a laitance layer. This is because it is almost thin layer and very weak layer and it shows bad adhesion. Therefore, when the pinhole layer is removed after completely removing the laitance layer in the pretreatment process, pinholes are putty by putty and then the interlayer between the flame retardant polyurea To increase the adhesion, coat concrete primer only.

Next, when the above preprocessing process is completed, the flame retardant polyurea coating material is applied at a pressure of 2,000 to 2,500 psi and a temperature of 65 to 70 ° C by using a two-pack type high-temperature high-pressure mixed- Also, in winter, the viscosity of the base and hardener increases due to the temperature drop. In this state, the ideal mixing ratio (volume ratio 1: 1) is not suitable and it is difficult to realize the physical properties of the coating film. Therefore, in winter, a heating band may be wrapped around the product to raise the temperature indirectly to lower the viscosity of the product, thereby obtaining the best coating property at an ideal mixing ratio.

In the following, embodiments of the present invention will be described in more detail with reference to the following explanations.

As shown in Table 1 below, in Examples 1 to 5, 65 parts by weight of polyetheramine having a molecular weight of 2,000 as a curing agent, 13 parts by weight of polyetheramine having a molecular weight of 5,000, 13 parts by weight of polydiethyltoluene diamine, 1.5 parts by weight of an adhesion promoter, 0.7 parts by weight of a coloring pigment and 4 parts by weight of a colored pigment were fixed and the NCO% of the isocyanate as a main prepolymerized resin solution was fixed to 15.5% by weight. The addition amount of TCEP as a flame retardant was 5, 8, , 13 parts by weight and 15 parts by weight, respectively.

Example 1 Example 2 Example 3 Example 4 Example 5 subject Isocyanate weight 100 100 100 100 100 NCO% (15.5%) 15.5% 15.5% 15.5% 15.5% 15.5% TCEP 5 8 10 13 15 Hardener Polyetheramine
(Molecular weight: 2,000) 65 65 65 65 65 Polyetheramine
(Molecular weight: 5,000) 13 13 13 13 13 Polydiethyltoluenediamine 13 13 13 13 13 Adhesion promoter 1.5 1.5 1.5 1.5 1.5 Defoamer 0.7 0.7 0.7 0.7 0.7 Colored pigment 4 4 4 4 4

The flame retardant polyurea coating materials prepared according to Examples 1 to 5 were prepared and coated on an iron plate to have a thickness of 400 to 500 탆 in order to examine the rust resistance of the steel surface. And the mechanical properties (tensile strength, elongation and adhesion) of the coating film for confirming the waterproofness of the concrete surface were checked for 1,000 hours, and the results are shown in Table 2 below.

Example 1 Example 2 Example 3 Example 4 Example 5 Salt spray test Good Good Good Malfunction Malfunction Tensile Strength (Mpa) 18.2 17.4 16.1 13.9 10.7 Elongation (%) 308 319 325 468 520 Adhesion (N / mm 2) 2.8 2.6 2.4 2.2 1.9 Flammability usually usually Good Good Great

As shown in Examples 1 to 5, when the flame retardancy of the flame-retardant polyurea was tested, it was found that when the addition amount of the TCEP flame retardant was more than 13 parts by weight, the corrosion resistance was poor. This is because TCEP is excessively added and reacted, and the remaining phosphorus elements block the chain due to polyurea reaction, thereby causing the reaction to be interrupted. As a result, the mechanical properties (tensile strength, elongation percentage increase) And it is believed that the coating has started because the coating itself is soft and water penetrates into the coating. In addition, the addition of TCEP to the flame retardant layer resulted in better flame retardancy, but it failed to exhibit its function as a waterproof and flooring material for conventional polyureas due to deterioration in mechanical properties. In Example 3, tensile strength, elongation, Rust resistance and flame retardancy.

As described above, the flame retardant polyurea coating composition according to the present invention is a flame retardant polyurea coating composition comprising a flame retardant such as nitrogen, halogen, And the phosphorus element which is a constituent of the flame retardant plays a role of retarding the reactivity to some extent, so that the problem that the dusts are apparently adhered to the coating film when the coating film is formed can be prevented.

Further, the durability of the coating film can be improved, and the stability and life of the structure can be extended.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. It is to be understood that the scope of the present invention is to be construed as being limited only by the following claims and their equivalents.

Claims (4)

100 parts by weight of a prepolymer solution prepared by prepolymerizing isocyanate by reaction with polypropylene glycol and having an NCO group content of 15 to 16% by weight and 5 to 10 parts by weight of TCE 2 (chloroethylphosphate) flame retardant A subject containing; And
A curing agent,
The curing agent,
60 to 70 parts by weight of a polyetheramine2e having a molecular weight of 2,000;
10-15 parts by weight of a polyetheramine having a molecular weight of 5,000;
10 to 15 parts by weight of polydiethyl toluene diamine (Diethytoluenediamine);
1 to 2 parts by weight of an adhesion promoter;
0.5 to 1 part by weight of an antifoaming agent; And
3 to 5 parts by weight of a colored pigment; ≪ RTI ID = 0.0 >
Flame retardant polyurea coating composition. delete delete The method according to claim 1,
Wherein the subject and the curing agent are reacted in a volume ratio of 1: 1
Flame retardant polyurea coating composition.