KR20090058377A - Eco-Polyurethane Foam Foam Composition for Automotive Seats - Google Patents

Abstract

The present invention relates to a polyurethane foam composition for automobile seats, and more particularly, to a polyol, a catalyst, a foam stabilizer and a foaming agent comprising at least one selected from a modified polyol and a polyether polyol modified from vegetable triglycerides and derivatives thereof. It relates to a polyurethane foam composition prepared by mixing and reacting a resin premix and an isocyanate. In the present invention, the modified polyol is a modification of vegetable triglycerides and derivatives thereof extracted from plants, which are not manufactured by conventional petrochemicals, and reduce crude oil and reduce CO ₂ emissions and end products as compared to polyol products obtained by petrochemical synthesis. It is possible to produce polyurethane foam material for automobile seats which greatly improves the reproducibility of the car. In particular, it relates to an environmentally friendly polyurethane foam foam composition that can be used very well for the manufacture of automotive interior seat foam with excellent odor prevention and antibacterial properties.

Description

Eco-Polyurethane foam composition of Automotive seats

The present invention relates to a polyurethane foam composition for automobile seats, and more particularly, to a polyol, a catalyst, a foam stabilizer and a foaming agent comprising at least one selected from a modified polyol and a polyether polyol modified from vegetable triglycerides and derivatives thereof. The present invention relates to an environment-friendly polyurethane foam composition prepared by mixing and reacting a resin premix and an isocyanate.

The modified polyol is a modified polyol obtained by modifying vegetable triglycerides and derivatives thereof. The polyurethane foam composition using the modified polyol has excellent properties in terms of mechanical properties such as odor reduction, antimicrobial and repulsive elasticity, and moldability. The present invention is an environment-friendly polyurethane foam composition, suitable for use as beddings, automotive interior materials, etc. In particular, when used as a material of the car seat can utilize the characteristics of the invention as it is.

With the development of the automobile industry, as the time spent in the interior of the automobile increases, the importance of indoor air quality in the automobile has recently increased. As a result, the demand for consumers' comfort inside the car is very high. Therefore, the removal and prevention of indoor air pollutant sources to prevent the pollution of the vehicle interior air is a very important problem for improving the merchandise of the vehicle.

In general, polyurethane foams are produced by the reaction of polyols and isocyanates. Currently, polyols used in polyurethane foams for automobile seats are generally polyether polyols obtained by reacting glycerin with ethylene oxide and propylene oxide. For this purpose, polyols having an average molecular weight of 5000 to 6000 g / mol are mainly used. Ethylene oxide and propylene oxide are used for the production of such polyols. Since these materials are very chemically unstable and require a lot of energy in the polyol manufacturing process and generate CO ₂ , which is a greenhouse gas, a new polyol raw material or a new polyol manufacturing process is required. It is becoming.

In addition, the polyurethane foam absorbs and adsorbs the surrounding moisture well due to the characteristics of the inner cell structure, and thus, an environment in which various species of bacteria are breeding is formed inside the polyurethane foam. Therefore, bacteria grow quickly inside the polyurethane foam, and the bacteria that grow multiply in the last and decay, causing a bad smell. To prevent this, a special antibacterial treatment was performed to prevent bacteria from inhabiting the polyurethane foam.

Existing polyurethane foam antimicrobial treatment has been using a method of immersing the foam molded polyurethane molded body in the antimicrobial solution and drying or spraying the antimicrobial solution on the surface of the polyurethane foam after forming the antibacterial film. However, these methods have a number of disadvantages as a method of adsorbing the antimicrobial solution to the polyurethane foam by a simple physical method. First, it is not easy to control the adsorption thickness of the antimicrobial membrane, As a result, a significant change occurs in the antimicrobial function of the antimicrobial membrane. For example, as the use time increases, a continuous antimicrobial film desorption occurs and the antimicrobial activity is lost. Second, the physical antimicrobial film forming method requires additional equipment. In addition to the continuous high pressure foaming line for manufacturing polyurethane foam for automobile seats, the addition of antibacterial solution impregnation equipment and drying equipment requires enormous cost and final polyurethane. It is impossible to introduce into the manufacturing process of polyurethane foam foam for automobile seats caused by the cost increase of foam foam, and polyurethane foam for automobile seats using this method has not been produced to date.

Therefore, the plastic industry, automotive industry, and the like, there is an increasing demand for a new environment-friendly polyurethane foam composition or a process for producing the same.

In order to solve the above problems and demands, the present inventors have continually studied, and modified polyvinyl triglyceride and its derivatives extracted from a vegetable material other than the polyol produced by the petrochemical method used in the production of polyurethane foam By using a polyol, it is possible to provide an environment-friendly polyurethane foam composition having excellent physical properties while being able to solve problems such as odor generation and bacterial growth which are problematic in existing polyurethane foam.

The present invention

Eco-friendly polyurethane for automobile seats comprising a resin premix and isocyanate containing a polyol, a catalyst, a foam stabilizer and a blowing agent comprising at least one selected from modified polyols and polyether polyols modified with vegetable triglycerides and derivatives thereof It relates to a foam foam composition.

The present invention relates to an environment-friendly polyurethane foam composition, and because it uses a modified polyol modified from vegetable triglycerides and derivatives thereof extracted from plants, there is little generation of CO ₂ generated in the general petrochemical polyol manufacturing process In addition, the present invention is excellent in mechanical properties and has an antibacterial function to prevent bacterial propagation, and also has an odor reduction and prevention effect.

In addition to improving the quality of life today, in particular, the interior environment of the automobile is important, and the quality of the air inside the automobile is highly dependent on the interior of the automobile. Particularly, in the case of polyurethane foam used as an automobile seat, a conventional petrochemical composition is used, and the structural characteristics of the polyurethane foam made from such a composition or the composition itself As a result of studies by the present inventors to solve the deterioration of the indoor air quality caused by the smell, the inventors have invented the eco-friendly polyurethane foam composition as follows.

The present invention

Resin premix and isocyanate containing a polyol, a catalyst, a foaming agent and a blowing agent comprising at least one selected from a modified polyol and a polyether polyol modified from vegetable triglycerides having a formula represented by the following Chemical Formula 1 or Chemical Formula 2 and derivatives thereof The present invention relates to an environment-friendly polyurethane foam composition for automobile seats, which will be described in more detail as follows.

The present invention

85 to 98% by weight of a polyol consisting of one or more selected from among modified triols and polyether polyols modified with vegetable triglycerides having a formula represented by Formula 1 or Formula 2 and derivatives thereof, 0.5 to 3% by weight of catalyst, foam stabilizer 0.4 The present invention relates to an eco-friendly polyurethane foam composition for automobile seats, comprising 65 to 95 parts by weight of isocyanate based on 100 parts by weight of a resin premix containing 5% by weight and 1 to 7% by weight of a blowing agent.

In Chemical Formula 1, R ₁ includes a saturated or unsaturated hydrocarbon as an alkyl group.

In Formula 2, R ₂ , R ₃ , and R ₄ each include a saturated or unsaturated hydrocarbon as an alkyl group.

Each composition of the present invention will be described in more detail below.

The polyol which is the composition of the present invention is characterized by consisting of at least one selected from modified polyols and polyether polyols modified with vegetable triglycerides and derivatives thereof. In particular, the modified polyol used in the present invention comprises at least one selected from vegetable triglycerides and derivatives thereof extracted from at least one selected from plants such as soybean, corn, and cotton seed;

The modified polyol is prepared by mixing and reacting a vegetable triglyceride: acetic acid = 1: 2.5 to 3.5 more preferably in a molar ratio of 1: 2.8 to 3.2, and through this reaction, a side chain of vegetable triglyceride The double bond moiety contained in is primarily transformed into a peroxide form, and the resulting peroxide moiety is further reacted with acetic acid, whereby some peroxide functional group is used to form a hydroxyl group (-OH). It is modified so as to contain a chemical structure. To the formula (3) is shown the formula of the vegetable triglyceride extracted from the soybean used in the present invention.

Formula 3 shows triglycerides extracted from soybeans.

In the present invention, the reason for using the modified polyol is to give the same or more moldability as the existing polyurethane foam by chemical reaction between hydroxyl group (-OH) and isocyanate group (-NCO) of isocyanate in the modified polyol. At the same time, the double bond portion of the side chain present in the modified polyol inhibits the metabolism of bacteria (exhibits the adsorption of bacteria by the excess electrons of the double bond, thereby providing antimicrobial activity to the polyurethane foam. Because it can play a role.

Herein, when the vegetable triglyceride and its derivatives have an acetic acid and a molar ratio of less than 1: 2.5, there is a problem in that the double bond portion included in the side chain of the triglyceride cannot be sufficiently modified into a peroxide form, and the molar ratio is 1 : If the content exceeds 3.5, the chemical structure may be unstable due to excessive peroxide formation, resulting in unstable cell structure when reacting with isocyanate. It is preferable.

The modified polyol may be used by mixing a modified triol alone or polyether polyol modified with vegetable triglycerides and derivatives thereof, wherein the polyether polyol has an average functional group of 2 to 5, and a hydroxyl group of 300 to 700 mg KOH / g It is preferable to use what is. If the average functional group is less than 2, the crosslinking property is insufficient when forming a foam, and molding is not desired. If the average functional group exceeds 5, excessive crosslinking occurs and the viscosity of the reactant is increased so that foaming is not well formed. Occurs. In addition, when the hydroxyl value is less than 300 mg KOH / g polyol reactor that can react with the isocyanate is low, there is a problem that the normal foam can not be formed, the excess cross-linking reaction occurs when 700 mg KOH / g exceeds the viscosity rises sharply do.

In the case of preparing the resin premix, when the modified polyol and the polyether polyol are mixed and used, the modified polyol: polyether polyol = 70 to 99: 30 to 1 is preferably used by mixing in a weight ratio. Here, if the weight ratio of the modified polyol to polyether polyol is less than 70, there is a problem that the antimicrobial and odor reducing effect of the resulting polyurethane foam is significantly reduced, and if it exceeds 99, the polyurethane reaction rate is significantly reduced to formability Degradation problem occurs.

Next, the catalyst which is one of the compositional materials of the present invention will be described in detail.

In the present invention, the catalyst serves to promote the reaction of the polyol and isocyanate included in the resin premix to have a network structure. The catalyst may be one or more selected from alkali metal hydroxide catalysts, alkaline earth metal hydroxide catalysts, tin catalysts, and amine catalysts. Particularly, in the present invention, since the amine catalyst has a property of speeding up the reaction rate, Preference is given to using a system catalyst.

The amine catalyst used in the present invention is pentamethylenediethylene triamine, dimethylcyclohexylamine, tris (3-dimethylamino) propylhexahydrotriamine {tris (3-dimethylamino) propylhexahydrotriamine }, It is preferable to use one or more selected from triethylene-diamine and derivatives thereof, but is not particularly limited thereto.

In the present invention, the catalyst may be used 0.5 to 3% by weight, more preferably 0.5 to 1.5 parts by weight of the total weight of the resin premix, the problem that the curing is delayed due to the reaction is delayed when the amount of the catalyst used is less than 0.5% by weight And, when exceeding 3% by weight may cause a problem that the reaction is too fast to crack the unfilled and polyurethane foam.

A foam stabilizer which is a composition in this invention is demonstrated below.

The role of the foam stabilizer used in the present invention serves to prevent the resulting cells from coalescing or breaking down when the cells are formed inside the polyurethane foam and to adjust the uniform cells to be formed. Although not particularly limited, it is preferable to use an organosilicon foam stabilizer having excellent reactant dispersibility in the reaction of the polyol and isocyanate contained in the resin premix. It is more preferred to use at least one mixture selected. In addition, the range of use may be 0.4 to 5% by weight, more preferably 0.4 to 2% by weight based on the total weight of the resin premix. Here, there is a problem that the foam foam molding is non-uniform when less than 0.4% by weight and the molding speed is slowed down when more than 5% by weight.

Next, a foaming agent which is one of the compositions of the present invention will be described in detail below.

In the present invention, the blowing agent functions to generate a gas when the polyol and isocyanate included in the resin premix react with the foamed foam structure. The type of blowing agent that can be used in the present invention is not particularly limited as used in the art, water, chlorofluorocarbon, hydrochlorofluorocarbon, hydrofluorocarbon or carbon dioxide may be used, but in terms of environmental Most preferably. Here, the water as the blowing agent reacts with the isocyanate to release carbon dioxide (CO ₂ ) while forming urea, and carbon dioxide causes the polyurethane to foam. In the present invention, the blowing agent may be used 1 to 7% by weight, more preferably 2 to 5% by weight based on the total weight of the resin premix. Here, if the foaming agent is less than 1% by weight, there is a problem in that the internal cell formation of the foam is inadequate. If the foaming agent is more than 7% by weight, the foam is deteriorated due to the excessive generation of the inner cell of the foam. .

Next, the isocyanate which is the composition quality of this invention is demonstrated.

In the present invention, isocyanate may be monoisocyanate, diisocyanate or the like, but diisocyanate is preferably used. The diisocyanate may be one or more selected from toluene diisocyanate, diphenylmethane diisocyanate, tolylene diisocyanate, and derivatives thereof.

The isocyanate may be used 65 to 95 parts by weight, more preferably 70 to 90 parts by weight with respect to 100 parts by weight of the resin premix, where the isocyanate is less than 70 parts by weight is not formed foam foam, If the amount exceeds 90 parts by weight, the molded foam is broken. It is preferable to use within the said range.

In the present invention, the resin premix is prepared with a polyol, a catalyst, a foam stabilizer, and a blowing agent comprising at least one selected from modified polyols and polyether polyols modified with vegetable triglycerides and derivatives thereof, and the preparation method thereof in the art As a general method to be used, the method is not particularly limited, and the method of mixing the resin premix and the isocyanate may also be manufactured by any of the methods used in the art.

Hereinafter, the present invention will be described in more detail based on the following examples. However, the present invention is not limited to the following examples.

Example  One

300 g of a modified polyol obtained by mixing and stirring 288.6 g of vegetable triglycerides having an average molecular weight of 4644 g / mol and 11.4 g of acetic acid having an average molecular weight of 4644 g / mol extracted from soybean having the formula (3) to a molar ratio of 1: 3 and pentamethylene as an amine catalyst 3 g of ethylene triamine, 3 g of polysiloxane polymer which is an organosilicon foam stabilizer, and 7.5 g of water were stirred and mixed to obtain a resin premix.

Thereafter, 300 g of the resin premix and 234 g of diphenylmethane diisocyanate were stirred, mixed and reacted for 150 seconds in a stirrer at a temperature of 19 to 21 ° C. and a stirring speed of 1000 rpm, and then injected into a 200 × 200 × 100 mm 3 mold. Polyurethane foam was prepared to carry out the present invention.

[Formula 3]

Example  2

It was carried out in the same manner as in Example 1, to prepare a polyurethane foam having a composition as shown in Table 1.

Example  3

In the same manner as in Example 1, but instead of 300g of the modified polyol of Example 1 using a modified polyol 225g and a polyether polyol 75g having an average functional group of 3 and the average hydroxyl group 400 mg KOH / g using the composition shown in Table 1 below Polyurethane foam having a was prepared.

Example  4

In the same manner as in Example 3, using the modified polyol 285g and 15g polyether polyol to prepare a polyurethane foam having a composition as shown in Table 1.

Example  5

In the same manner as in Example 1, the modified polyol was used as a vegetable triglyceride extracted from corn, not soybean, to prepare a polyurethane foam having a composition as shown in Table 1.

Example  6

The same method as in Example 5, except that the resin premix using a modified polyol 225g and 75g polyether polyol having an average functional group of 3 and an average hydroxyl group of 500 mg KOH / g used in Example 5 Polyurethane foam having the same composition was prepared.

Comparative example  One

The same method as in Example 1, except that the polyol of the resin premix having a composition as shown in Table 1 using a polyether polyol 300g having an average functional group 3 and an average hydroxyl group of 400 mg KOH / g prepared by the petrochemical reaction Polyurethane foam was prepared.

Comparative example  2

The same method as in Example 1, the same as the Comparative Example 1, except that the polyol of the resin premix using a polyether polyol 300g having an average functional group of 4 and an average hydroxyl group of 600 mg KOH / g prepared by the petrochemical reaction A polyurethane foam having a composition as shown in Table 1 was prepared.

Comparative example  3

The same method as in Example 1 and Example 1, except that the polyurethane foam having the composition shown in Table 1 using 186 g of diphenylmethane diisocyanate to add 59.3 parts by weight of isocyanate to 100 parts by weight of the resin premix Foam was prepared.

Classification (Unit: g) Resin Premix Isocyanate Poly All catalyst Foam stabilizer blowing agent Sum Modified polyols Polyether polyol ^A) Pentamethylene ethylene triamine ^B) Organosilicon foam stabilizer ^C) water Diphenylmethane diisocyanate ^D) Extracted from soybeans. Extracted from Corn. Example 1 300 - - 3 3 7.5 313.5 234 Example 2 300 - - 6 3 12 321 225 Example 3 225 - 75 3 3 7.5 313.5 234 Example 4 285 - 15 6 3 12 321 276 Example 5 - 300 - 3 3 7.5 313.5 234 Example 6 - 225 75 4.5 4.5 9 318 225 Comparative Example 1 - - 300 3 3 7.5 313.5 234 Comparative Example 2 - - 300 6 3 12 321 225 Comparative Example 3 300 - - One 3 7.5 313.5 186 A) Polyol Korea, GP-3000 (brand name) B) TOSHO Corp, Toyocat DT C) Air Product, DABCO DC-193 D) Kumho Mitsui, Cosmonate MC-70 product (isocyanate group content = 31.2 wt%, viscosity 197 cps) / 25 ℃)

Experimental Example

Polyurethane Foam  Formability evaluation

Moldability evaluation of the polyurethane foam was evaluated by measuring the CT (cream time) and RT (rise time) during foam production. CT represents the time interval from the start of mixing the foam compositions of the Examples and Comparative Examples to the time when the changes in the volume and viscosity of these reaction mixtures are visually observed, RT is the mixing of the foam composition to the rising of the foam (Rising) It represents the time until the end point. Petrochemical Synthesis Polyurethane foams using general polyether polyols and vegetable triglyceride modified polyols were compared and evaluated by molding under the same composition conditions, and the results are shown in Table 2 below.

Polyurethane Foam  Antimicrobial Evaluation

Antibacterial property evaluation was measured by the polyurethane foam test prepared in Examples and Comparative Examples by the antibacterial test method of the fabric (KS K 0693-1990).

The measuring method is to evaluate the growth of bacteria on the sample. After inoculating and incubating the test specimen and the control specimen with a test sample, shaking the sample in a liquid, extracting the cultured bacteria, and counting the number of bacteria in the liquid. Measurement was made 18 hours after the injection and the results are shown in Table 2 below. Here, the number of initially injected bacteria was 2.0x10 ⁴ , and the bacteria used were Escherichia col / ATCC 25922.

Polyurethane Foam Appearance  evaluation

Foam appearance evaluation was measured by visual evaluation of the molded article and the results are shown in Table 2 below.

Table 2 shows Examples 1 to 6 and Comparative Examples 1 to 3 of Table 1 in Experimental Examples 1 to 6 and Comparative Experimental Examples 1 to 3, respectively.

division Antimicrobial activity Formability Appearance Experimental Example 1 Less than ten bacteria Good Good Experimental Example 2 Less than 30 bacteria Good Good Experimental Example 3 Less than 1000 bacteria Good Good Experimental Example 4 Less than 200 bacteria Good Good Experimental Example 5 Less than 50 bacteria Good Good Experimental Example 6 Less than 500 bacteria Good Good Comparative Experimental Example 1 Number of bacteria 4.0x 10 ⁴ Good Good Comparative Experimental Example 2 Number of bacteria 5.0x 10 ⁴ Good Good Comparative Experiment 3 Less than 30 bacteria Molding Speed Delay Bad

Referring to Table 2, Experimental Examples 1 to 6 of the polyurethane foams prepared using at least one selected from modified polyols and polyether polyols modified from vegetable triglycerides and derivatives thereof extracted from soybean or corn In the case, it was confirmed that not only the antibacterial property was excellent, but also the moldability and appearance were very good. However, in Comparative Examples 1 and 2, in which polyurethane foams were manufactured using only polyether polyols prepared by conventional petrochemical synthesis, it was found that the number of bacteria was very high and almost no antibacterial activity was confirmed. Could. And when comparing the experimental examples 1, 3 and 4, it can be seen that the difference in the antimicrobial properties according to the use of the modified polyol. That is, it can be confirmed that the modified polyol which is a component of the present invention has an antibacterial effect.

In addition, in the case of using the modified polyol, Comparative Example 3 using a catalyst less than 0.5% by weight relative to the total weight of the resin premix, it was confirmed that the molding speed is delayed, and the moldability is deteriorated. In this case, due to the use of less isocyanate it was confirmed that the moldability is deteriorated and the appearance is not good.

As confirmed from the examples and experimental examples, the polyurethane foam composition of the present invention not only has excellent antimicrobial properties, and thus can prevent odors such as odors caused by bacteria, and polyurethane foams should be basically provided. It was also found that the appearance and moldability were excellent. Such a polyurethane foam composition of the present invention can be used as a bedding material, automotive interior materials, and the like, in particular, it is an invention that can be used as an environmentally friendly material for automobile seats.

Claims (7)

Resin premixes and isocyanates containing polyols, catalysts, foam stabilizers, and blowing agents comprising at least one selected from a modified polyol and a polyether polyol obtained from a vegetable triglyceride having the formula represented by Formula 1 or Formula 2 below Eco-friendly polyurethane foam composition for automobile seats.  [Formula 1]

In Chemical Formula 1, R ₁ includes a saturated or unsaturated hydrocarbon as an alkyl group.  [Formula 2]

In Chemical Formula 2, R ₂ , R ₃ , R ₄ Each includes saturated or unsaturated hydrocarbons as alkyl groups. According to claim 1, wherein the triglyceride is extracted from soybeans, eco-friendly polyurethane foam foam composition for an automobile seat, characterized in that having the chemical structure of the formula (3).  [Formula 3]

2. The modified polyol according to claim 1, wherein the modified polyol comprises vegetable triglycerides extracted from at least one selected from soybeans, corn and cotton seed which are plants; The modified polyol is an eco-friendly polyurethane foam foam composition for an automobile seat, characterized in that the vegetable triglyceride and acetic acid in a molar ratio of vegetable triglyceride: acetic acid = 1: 2.5 to 3.5. [Claim 2] The eco-friendly polyurethane foam composition for automobile seat according to claim 1, wherein the polyol and the polyether polyol are contained in a weight ratio of modified polyol: polyether polyol = 70 to 99: 1 to 30. . The eco-friendly polyurethane foam composition for automobile seats according to claim 1 or 4, wherein the polyether polyol has an average functional group of 2 to 5 and a hydroxyl group of 300 to 700 mg KOH / g. According to claim 1, wherein the resin premix is based on the total weight of 85 to 98% by weight of the polyol, 0.5 to 3% by weight of the amine catalyst, 0.4 to 5% by weight of the foaming agent silicone oil 1 to 7% by weight of the blowing agent Eco-friendly polyurethane foam composition for automobile seats, characterized in that it contains. According to claim 1, wherein the isocyanate is eco-friendly polyurethane foam foam composition for an automobile seat, characterized in that consisting of 65 to 95 parts by weight of isocyanate based on 100 parts by weight of the resin premix.