KR101914595B1 - Two-component polyurethane foam composition - Google Patents

Abstract

The present invention relates to a two-component polyurethane foam composition, and more specifically, to a two-component polyurethane foam composition which includes: a main material comprising isocyanate; and a curing agent comprising a polyol mixture, a foaming agent, a solvent, a catalyst, a filler and an additive. Polyurethane foam produced by using the two-component polyurethane foam composition of the present invention has weather resistance which is resistant to climate change such as temperature, humidity, etc.; has excellent resistance to external pressure and cracks; has fast curing speed for shortening the time required for work; and exhibits excellent quality without deteriorating physical properties when being cured in low temperature conditions such as winter.

Description

Two-component polyurethane foam composition < RTI ID = 0.0 >

More particularly, the present invention relates to a liquid polyurethane foam composition comprising a subject containing isocyanate and a curing agent comprising a polyol mixture, a foaming agent, a solvent, a catalyst, a filler and an additive will be.

A streetlight for illuminating the street with a distance from the street by illuminating the street by the illumination light and a fence installed for the purpose of securing the entrance or safety of the outside to the specific area, So that the strut is supported and fixed by the foundation structure and stably fixed on the ground.

Such a foundation structure is formed by installing a formwork in a pit formed by a tappet at a position where a pillar is to be installed, placing concrete or mortar on the form, curing it, and removing the formwork. Thereafter, an anchor bolt is buried in the upper part of the foundation structure through a separate operation, and the support is coupled to the anchor bolt, so that a system in which the support is fixed on the ground is generally used.

However, since such a conventional foundation structure is installed by complicated work processes such as formwork and installation, concrete pouring, curing and form dismantling, the working time is extended and the economic loss due to the necessity of supporting large equipment due to construction And there is a problem that the operation efficiency is significantly lowered.

Conventional concrete or mortar foundation structures are contaminated with toxic substances generated from cement when they are put into the soil due to the addition of cement. In addition, when the curing period is long and a sudden change in the environment occurs during curing, there is a problem that the strength and stability of the foundation structure deteriorate due to cracks or perforations.

In particular, when working in winter, the curing speed is slower due to the lower temperature, and physical properties are lowered due to freezing, which makes the winter work substantially difficult. In the case of using quick cement, There is a problem that strength is lowered and cracks are generated.

Accordingly, the present invention provides a liquid polyurethane foam composition which can be used as a base structure in place of concrete or mortar.

Registration No. 1453333 (Registered on October 15, 2014)

The present invention provides a two-component polyurethane foam composition composed of a subject containing isocyanate and a curing agent comprising a polyol mixture, a foaming agent, a solvent, a catalyst, a filler and an additive, thereby enabling quick curing and high strength, And to provide a liquid type polyurethane foam composition having excellent compressive strength even in a low temperature environment.

In order to solve the above problems, an embodiment of the present invention provides a liquid polyurethane foam composition comprising a subject containing isocyanate and a curing agent comprising a polyol, a foaming agent, a catalyst, a filler, and an additive.

Wherein the isocyanate has at least two isocyanate groups (NCO groups) and a viscosity range of 150 to 300 cPs, and the polyol is selected from the group consisting of a polyester polyol, a polycarbonate polyol, a polycaprolactone polyol and a polyether polyol At least one polyol or polyol mixture, and may have a viscosity ranging from 650 to 850 cPs.

Wherein the foaming agent is at least one foaming additive selected from the group consisting of hydrofluorocarbons, cyclic hydrocarbons, carbon dioxide gas, liquefied carbon dioxide gas, and methane dichloride, and water at a weight ratio of 1: 5: 100 .

The catalyst may include at least one catalyst selected from the group consisting of an amine compound, an organometallic compound, and a polyamino chlorophenyl methane compound.

The additive may include at least one of a solvent, a chain extender, a strength enhancer and a foam stabilizer.

The solvent may be a mixture of acetone and tert-butyl acetate.

It is preferable that the chain extender contains two or more hydroxy groups and does not contain oxygen in the main chain.

The strength-increasing agent may be 2,2-bis- (4- (2-hydroxy-3-methacryloyloxypropoxy) phenyl) propane.

The liquid polyurethane foam composition of the present invention and the basic structure constructed using the liquid polyurethane foam composition of the present invention have excellent weather resistance against climate change such as temperature and humidity, and are excellent in external pressure and resistance to cracking.

In addition, it is possible to manufacture a base structure having excellent compressive strength even at a low temperature, and the time required for the work is short because of the rapid curing speed, and it can be used safely and easily.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. As well as the fact that

Throughout this specification, when an element is referred to as " including " an element, it is understood that it may include other elements as well, without departing from the other elements unless specifically stated otherwise.

Throughout this specification, "%" used to denote the concentration of a particular substance is intended to include solids / solids (weight / weight), solid / liquid (weight / volume) / Liquid means (volume / volume)%.

Further, the molecular weight used in the entire specification means the weight average molecular weight.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains and, where contradictory, Will take precedence.

Hereinafter, the liquid type polyurethane foam composition of the present invention will be described in more detail.

The liquid polyurethane foam composition of the present invention may contain a subject containing isocyanate and a curing agent including a polyol, a blowing agent, a catalyst, a filler and an additive, or may be composed of only the subject and the curing agent.

The liquid type polyurethane foam composition of the present invention can be used to fix a strut such as a street lamp or a fence to the ground. By reacting the isocyanate with the polyol under the foaming agent, the catalyst and the additive by mixing the curing agent with the subject, .

The isocyanate contained in the subject contains at least two isocyanate groups (NCO groups), preferably two to five isocyanate groups. The isocyanate is preferably an aromatic isocyanate. Examples of the isocyanate include aromatic diisocyanates such as methylene diphenyl diisocyanate (MDI), xylene diisocyanate (XDI), tetramethyl m- or p-xylene diisocyanate (TMXDI), toluene diisocyanate TDI), dialkyldiphenylmethane diisocyanate, 3,3'-dimethyldiphenyl-4,4'-diisocyanate (TODI), 1,3-phenylene diisocyanate, 1,4-phenylene diisocyanate, naphthalene Diisocyanate (NDI), and 4,4'-dibenzyl diisocyanate.

More preferably, it may be methylene diphenyl diisocyanate (MDI) which can smoothly carry out low-density foaming, obtain excellent rebound resilience and emit less environmental pollutants due to volatilization. In the case of using methylene diphenyl diisocyanate (MDI), it is preferable to use MDI polymer. Unlike MDI monomer, MDI polymer exists in a liquid state at room temperature and is easy to handle, It happens because.

The equivalent weight of the isocyanate is 250 to 400 g / eq. When the equivalent weight is less than the above range, it is difficult to obtain sufficient physical properties after curing. When the equivalent weight is more than the above range, viscosity is high and workability is deteriorated.

In addition, it is preferable that the subject containing isocyanate has a viscosity in the range of 150 to 300 cPs in order to improve the workability and at the same time to improve the adhesion to the pillars, the land and the support.

On the other hand, the curing agent includes a polyol, a foaming agent, a catalyst, a filler and an additive. Specifically, 1.2 to 5.3 parts by weight of the foaming agent, 0.1 to 2.0 parts by weight of the catalyst, 5 to 13 parts by weight of the filler and 6.8 to 33.3 parts by weight of the additive may be added to 100 parts by weight of the polyol.

The polyol contains at least two hydroxyl groups (OH), preferably two to five OH groups, and the equivalent of polyol is 40 to 150 g / eq. , And the viscosity is preferably 650 to 850 cPs.

The polyol may be at least one selected from the group consisting of a polyester polyol (PES polyol), a polycarbonate polyol (PC polyol), a polycaprolactone polyol (PCL polyol), and a polyether polyol, but may be at least one selected from the group consisting of a polyester polyol and a polycarbonate polyol Is preferably used.

Polyester polyols are easily synthesized, have a low cost for synthesis, and can produce polyurethanes having good physical properties when used in polyurethane synthesis. However, polyurethanes prepared using only polyester polyols have somewhat lacking properties for use in a foundation structure for fixing a strut such as a streetlight or a fence to the ground. Therefore, in the present invention, as the polyol which reacts with isocyanate, polyester polyol By using a polycarbonate polyol together, physical properties such as strength, water resistance and weather resistance of the polyurethane can be improved.

The polyester polyol is obtained by reacting a polyfunctional alcohol with a polyfunctional acid. For example, the polyfunctional alcohol may be ethylene glycol, diethylene glycol, glycerin or 1,6-hexanediol, and the polyfunctional acid may be carboxylic acid, The molecular weight of the polyester polyol produced by this method is preferably 800 to 3000 g / mol, more preferably 1000 to 1800 g / mol, and more preferably 1000 to 1800 g / mol, Is more preferable.

The polycarbonate polyol is preferably a polycarbonate polyol having a molecular weight of 500 to 2000 g / mol, more preferably 1000 to 1800 g / mol, having a carbonate bond in the main chain and OH groups at both ends.

The molecular weight of the polyol is limited as described above to ensure sufficient physical properties of the polyurethane foam and to improve workability at the time of production. When the molecular weight of the polyol is less than the above-mentioned range, even if two polyols are used in combination, It is difficult to secure a sufficient strength for use. If it exceeds the above range, the strength may be improved, but there is a problem that it is difficult to mix the curing agent and the base during the operation due to an increase in the excessive viscosity.

At this time, it is preferable that the polyester polyol and the polycarbonate polyol are used so as to have a weight ratio of 1: 0.05 to 0.25. When the polycarbonate polyol is contained within the above range, the property of the polyurethane foam can not be sufficiently improved, , The curing time of the polyurethane foam may increase and the working efficiency may be lowered.

The foaming agent may contain water and may be contained in an amount of 1.2 to 5.3 parts by weight based on 100 parts by weight of the polyol. When the water is contained in a range exceeding the above weight range, the foam is not sufficiently formed due to the lack of water, or large pores are formed due to a rapid reaction, so that the strength of the polyurethane foam may be lowered. .

It is preferable to use a foaming additive such as hydrofluorocarbons (such as HFC-245fa), cyclic hydrocarbons (cyclopentane and the like), carbon dioxide gas, liquefied carbon dioxide gas, and dichloromethane together with water as a foaming agent, The use of such foam additive and water together can result in more effective foaming and more uniform bubble size. In such a case, the water and the foaming additive are preferably used in a weight ratio of 100: 1 to 5.

The catalyst may be added in an amount of 0.1 to 2.0 parts by weight based on 100 parts by weight of the polyol, so that the isocyanate and the polyol react rapidly even at room temperature. When the catalyst is contained below the above-mentioned weight range, the effect expected by adding the catalyst does not sufficiently take place. On the other hand, if it exceeds the above-mentioned weight range, the urethane reaction rate is accelerated more than necessary, and the polyurethane foam may be damaged due to excessive heat, and the urethane reaction may occur while mixing the base and the hardener, And it is difficult to control the amount of foaming with time, so that there is a problem that the polyurethane foam has uneven physical properties as a whole.

Examples of the room temperature curing catalyst include amine compounds such as triethylamine, triethylenediamine, palmityl dimethylamine, pentamethyldiethylenetriamine, N, N-dimethylaminoethylether, dimethylethanolamine and triethanolamine, potassium oleate, , Tin octylate, tin chloride, iron chloride, dibutyltin dilaurate, tetra-2-ethyl-hexyl titanate, and the like, or organic metal compounds such as 4,4'-diamino-3,3'-dichlorodi Polyamino chlorophenylmethane compounds such as phenylmethane (MBOCA), trimethylenebis-4-aminobenzoate, methylenebis-2-ethyl-6-methylaniline and methylenebis-2,3-dichloroaniline are used alone , Or two or more of them may be used in combination.

In this case, when the amine compound and the organometallic compound are used together as a room temperature curing catalyst, the final curing time is shortened by the amine compound, the curing is delayed and the fluidity is maintained It is preferable to use an amine compound and an organometallic compound together.

On the other hand, the filler is added in order to strengthen the physical properties of the polyurethane foam and to prevent shrinkage and deformation, and it is preferable to add the filler having an average particle diameter of 1 to 20 mu m. Here, the average particle diameter means the average long diameter of the filler particles.

The filler may be included in an amount of 5 to 13 parts by weight based on 100 parts by weight of the polyol. When the filler is contained in the weight range below, the effect of improving mechanical properties is difficult to obtain. When the filler is contained in excess of the weight range, And the mechanical properties are deteriorated because the dispersibility of the filler is lowered. Therefore, it is preferable to include the weight within the above range.

The filler may have various shapes such as acicular, spherical, plate or amorphous, but it is preferable to use a mixed type in which the acicular filler and the spherical filler are mixed. Here, the needle bed means that the long diameter is three times or more of the short diameter, and includes a fusiform shape, a cylindrical shape, a rectangular shape, and the like. The spherical shape is close to spherical shape and spherical shape, which means that the ratio of the average long diameter to the average short diameter is close to 1: 1.

When a mixed filler in which an acicular filler and a spherical filler are mixed is used, resistance to deformation due to torsion and load can be improved as compared with the case of using a single type filler.

The filler may be an organic filler or an inorganic filler, and the organic filler may be at least one selected from polytetrafluoroethylene, polyphenylene sulfide, polyether imide, polyphenyl ether and polyether sulfone, and the inorganic filler may be silica, And may be at least one selected from glass fiber, aluminum nitride, boron nitride, silicon carbide, aluminum hydroxide, titanium dioxide, strontium titanate, barium titanate, alumina, barium sulfate, talcum powder, calcium silicate, calcium carbonate and mica.

The organic filler has a relatively low strength compared with the inorganic filler, while the organic filler does not easily peel off due to the deformation of the polyurethane foam due to its excellent adhesion with the polyurethane foam, while the inorganic filler has a relatively high strength, The adhesive strength is somewhat weak.

Therefore, more preferably, an organic-inorganic composite filler can be used. In the organic-inorganic composite filler, an inorganic filler is coated on the surface of the core inorganic filler with an organic filler such as polytetrafluoroethylene, polyphenylene sulfide, polyether imide, polyphenyl ether, or polyether sulfone. When such an organic-inorganic composite filler is used, it exhibits higher strength than the organic filler or inorganic filler when the same amount is used, and has excellent adhesion with the polyurethane foam, resulting in peeling due to contraction and deformation of the polyurethane foam Do not.

On the other hand, the additive may include at least one of a solvent, a chain extender, a strength enhancer and a foam stabilizer.

It is preferable that the solvent imparts solubility when mixing the subject and the curing agent and does not affect the physical properties of the polyurethane foam when the curing is completed. The solvent is preferably contained in an amount of 4 to 22 parts by weight based on 100 parts by weight of the polyol. It is most preferable to use acetone and butyl acetate (t-BA) in a weight ratio of 9: 1 to 2 , Acetone and tert-butyl acetate are less environmentally friendly because they generate less VOC.

Since acetone has a high volatilization rate, it can be volatilized before curing is completed. However, when it is used alone, it is difficult to impart sufficient solubility until the completion of the mixing by volatilizing during mixing of the base and the curing agent due to the rapid volatilization rate. By adding tert-butyl acetate having a low volatilization rate, the volatilization rate of the solvent is adjusted to lower the viscosity at the time of mixing to impart solubility, and at the time of completion of the mixing and curing, the volatilization rate is lowered to affect the physical properties of the polyurethane foam .

This effect appears when acetone and tert-butyl acetate are mixed at a weight ratio of 9: 1. When the content of tert-butyl acetate is less than the above ratio, it is difficult to control the rapid volatilization rate of the solvent. The solvent is not volatilized at the completion of curing, which may cause deterioration of the physical properties of the polyurethane foam.

The chain extender is added to improve the physical properties such as the compressive strength by extending a chain of the polyurethane foam formed by the reaction of the isocyanate and the polyol, and is preferably included in 2 to 7 parts by weight relative to 100 parts by weight of the polyol .

As the chain extender, it is preferable to use two or more hydroxyl groups and not containing oxygen in the main chain. When oxygen is contained in the main chain, the chain is easily rotated around oxygen, and polyurethane foam The physical properties of the resin are deteriorated. Such chain extender may include one or more substances selected from the group consisting of butanediol, ethylene glycol, propylene glycol, diethanolamine, triethanolamine, glycerol and pentaerythritol, preferably having a molecular weight of 50 to 2000 g / mol May be included.

Strengthening agents are added to improve the strength of the polyurethane foam by inducing additional crosslinking reaction when the isocyanate and the polyol are reacted, and to prevent a decrease in compressive strength when the polyurethane is applied in a low temperature environment.

Such strength enhancing agents may include 2,2-bis- (4- (2-hydroxy-3-methacryloyloxypropoxy) phenyl) propane. It is preferable that the strength-increasing agent is included in an amount of 0.7 to 2.6 parts by weight based on 100 parts by weight of the polyol. When the content is less than the above-mentioned range, the strength improving effect is insignificant. It may interfere with the reaction and the foaming may not be sufficiently performed.

The anti-foaming agent prevents the diffusion of gas by lowering the surface tension of the polyurethane foam formed by the reaction of isocyanate and polyol to lower the surface tension by lowering the pressure difference between the bubbles, Has a function of helping to have a uniform density. The foaming agent is preferably contained in an amount of 0.1 to 1.7 parts by weight based on 100 parts by weight of the polyol. The foaming agent may be any of those conventionally used in the production of a polyurethane foam such as a silicone foaming agent and a fluorine-based foaming agent.

On the other hand, the mixture of the isocyanate and the polyol should have a NCO / OH equivalent ratio of 2 to 10, preferably 3 to 6, so that the reactivity of the two materials can be improved, and the performance balance of the polyurethane foam can be improved In addition, since it can actively react with water to effect effective foaming, it is preferably blended so as to have the above-mentioned NCO / OH equivalent ratio.

Hereinafter, the polyurethane foam composition according to one embodiment of the present invention will be described, and the specific actions and effects of the present invention will be described. However, it should be understood that the present invention is not limited thereto.

Manufacturing example

Methylene diphenyl diisocyanate (MDI) polymer having a molecular weight of 664 g / mol was prepared, and a curing agent mixed in the composition ratio shown in Table 1 was prepared. Among the curing agents, silica powder having an average diameter of 10 탆 was used as a filler, and 2,2-bis- (4- (2-hydroxy-3-methacryloyloxypropoxy) phenyl) (TEGOSTAB ^® B-8409, Evonik Industries) was used as the stabilizer.

Unit: g Experimental Example
One Experimental Example
2 Experimental Example
3 Experimental Example
4 Experimental Example
5 Experimental Example
6 Experimental Example
7 Experimental Example
8 Experimental Example
9 PES polyol 1000 920 920 920 920 920 920 920 920 PC polyol 0 80 80 80 80 80 80 80 80 water 14 14 14 14 14 14 14 14 14 Cyclo
Pentane 3 3 3 3 3 3 3 3 3 Triethyl
Amine 5 8 0 5 5 5 5 5 5 Potassium oleate 3 0 8 3 3 3 3 3 3 filler 90 90 90 90 90 90 90 90 90 Acetone 113 113 113 113 113 113 113 113 113 t-BA 17 17 17 17 17 17 17 17 17 Penta
Erythritol 35 35 35 35 35 35 35 35 35 Strengthening agent 12 12 12 0 5 9 12 24 27 Foaming agent 8 8 8 8 8 8 8 8 8

Example  One

Measuring housework time

100 g of the curing agent of Experimental Examples 1 to 8 were mixed at 25 DEG C and the mixture was stirred at 1950 rpm for 15 seconds using a speed mixer and the time until gelation was measured using a Shyodu gel timer, The results are shown in Table 2.

Curing time measurement

100 g of the curing agent of Experimental Examples 1 to 8 were mixed at 25 DEG C, and the mixture was stirred at 1950 rpm for 15 seconds using a speed mixer, and then poured into molds for curing. The time when the surface of the polyurethane foam was strongly pressed with the fingers was measured every 1 minute after 40 minutes from the start of the curing, and the results are shown in Table 2.

Measurement of foaming rate

100 g of each of the above-prepared curing agents and the curing agents of Experimental Examples 1 to 8 were mixed at 25 DEG C, and the mixture was stirred at 1950 rpm for 15 seconds using a speed mixer. The weight and volume were measured to determine the initial density, The final density was determined by measuring the weight and the volume after which the foaming ratio for each experimental example was calculated, and the ratio of the final density to the initial density was defined as the foaming ratio. The results are shown in Table 2.

Compressive strength measurement

The test was conducted five times at a crosshead speed of 10 mm / min at 25 ° C. using a universal testing machine (STM-10E ^® , United Co.) according to the ASTM D1621-10 method. Respectively.

Pot life (min) Curing time (min) Foaming rate Compressive strength (kg _f / cm ²⁾ Experimental Example 1 4.6 69 10.8 11.3 Experimental Example 2 8.3 78 9.9 11.9 Experimental Example 3 5.0 94 10.0 11.7 Experimental Example 4 4.5 62 10.1 7.8 Experimental Example 5 4.1 66 10.2 8.3 Experimental Example 6 4.2 65 10.4 12.1 Experimental Example 7 4.3 67 10.4 12.8 Experimental Example 8 4.2 66 10.3 13.1 Experimental Example 9 4.1 65 7.6 8.2

As a result of the test, it was confirmed that the compressive strength of Experimental Example 4, which does not contain the strength enhancing agent, is significantly lower than those of other Examples including the strength enhancing agent.

In Experimental Example 5 and Experimental Example 9, it was also found that the compressive strength was lowered even when the strength increasing agent was used in a range of 0.7 to 2.6 parts by weight based on 100 parts by weight of the polyol.

Comparing Experimental Example 1 with Experimental Example 7, it was confirmed that the compression strength was improved when a polyester polyol and a polycarbonate polyol were mixed as a polyol, and when Experimental Examples 2 and 3 and Experimental Example 7 were compared , It was found that both the pot life and the curing time were shortened when the amine catalyst and the organometallic catalyst were used together to improve the workability.

Example  2

Comparative Examples 1 to 3 were used as the conventional commercial products, such as Secure set 4 ^TM (GRA Services), foam-it 5 ^TM (Smooth-On) and fast2K ^TM (Royal Adhesives & Sealants Canada Ltd.) ~ 3 were used to perform the same tests as the curing time measurement test and the compressive strength measurement test of Example 1, and the results are shown in Table 3.

Thereafter, the same tests as in the case of the curing time measurement test and the compressive strength measurement test of Example 1 were carried out in the low temperature curing condition of -10 캜 using the test examples 4 and 7 and the comparative examples 1 to 3, Respectively.

Curing time (min) Compressive strength (kg _f / cm ²⁾ Curing temperature 25 ℃ -10 ° C 25 ℃ -10 ° C Comparative Example 1 72 116 5.9 4.7 Comparative Example 2 120 177 9.5 8.3 Comparative Example 3 45 81 7.6 5.8 Experimental Example 4 62 93 7.8 6.9 Experimental Example 7 67 71 12.8 12.6

Experimental results show that Comparative Examples 1 to 3, which are conventional commercial products, and Experimental Example 4, which does not contain a strength enhancing agent, exhibit significantly lower compressive strength at room temperature than those of Experimental Example 7, The curing time was prolonged, and the compressive strength was rapidly decreased.

On the other hand, it has been found that a composition containing a subject and a curing agent according to the present invention, in which 2,2-bis- (4- (2-hydroxy-3-methacryloyloxypropoxy) phenyl) propane, which is a strength- It was confirmed that a polyurethane foam having excellent quality without any change in physical properties can be obtained even when it is cured under a low temperature condition as well as showing excellent compression strength and quick curing.

Accordingly, in the liquid type polyurethane foam composition comprising the subject matter and the curing agent according to the present invention, the polyol contained in the curing agent includes a polyester polyol and a polycarbonate polyol, and as a catalyst promoting the urethane reaction of the polyol and the isocyanate, (4- (2-hydroxy-3-methacryloyloxypropoxy) phenyl) propane as the strength-increasing agent, the pot life and the curing It can be utilized as a foundation structure for fixing the pillar-like strut to the ground because the work is short and the compression strength is high because of shortening of the time, and even if it is cured at a low temperature such as winter, the polyurethane foam Can be prepared.

The present invention is not limited to the above-described specific embodiments and descriptions, and various modifications can be made to those skilled in the art without departing from the gist of the present invention claimed in the claims. And such modifications are within the scope of protection of the present invention.

Claims (7)

A subject comprising isocyanate; And
A curing agent comprising a polyol, a blowing agent, a catalyst, a filler and an additive,
The isocyanate has at least two isocyanate groups (NCO groups) and a viscosity range of 150 to 300 cPs,
Wherein the polyol comprises a polyol mixture in which the polyester polyol and the polycarbonate polyol are mixed in a weight ratio of 1: 0.05 to 0.25, has a viscosity in the range of 650 to 850 cPs,
The catalyst is a room temperature curing catalyst in which an amine compound and an organometallic compound are mixed and is contained in an amount of 0.1 to 2.0 parts by weight based on 100 parts by weight of the polyol,
Wherein the additive comprises a solvent, a chain extender, a strength enhancer and a foam stabilizer,
The strength-increasing agent is characterized in that 0.7-2.6 parts by weight of 2,2-bis- (4- (2-hydroxy-3-methacryloyloxypropoxy) phenyl) propane is contained in 100 parts by weight of the polyol By weight, based on the total weight of the liquid polyurethane foam composition. The method according to claim 1,
Wherein the foaming agent is at least one foaming additive selected from the group consisting of hydrofluorocarbons, cyclic hydrocarbons, carbon dioxide gas, liquefied carbon dioxide gas and methane dichloride, and water in a mixing ratio of 1: 5: 100 By weight, based on the total weight of the polyurethane foam composition. delete delete The method according to claim 1,
Wherein the solvent is a mixture of acetone and tert-butyl acetate. The method according to claim 1,
Wherein the chain extender contains two or more hydroxy groups and does not contain oxygen in the main chain.
delete