KR20240054816A - Polyurethane foam composition containing biomaterial, polyurethane foam molded body to which it is applied, and method for manufacturing the polyurethane foam molded body - Google Patents

Abstract

The present invention relates to a polyurethane foam composition containing biomaterials, a polyurethane foam molded body using the same, and a method of manufacturing the polyurethane foam molded body.
Specifically, the polyurethane foam composition according to the present invention includes an eco-friendly compound containing dextrin, a biomaterial, polyol, a polyol mixture containing melamine resin and additives, and isocyanate.

Description

Polyurethane foam composition containing biomaterial, polyurethane foam molded body to which the same is applied, and method of manufacturing the polyurethane foam molded body MOLDED BODY}

The present invention relates to a polyurethane foam composition containing biomaterials, a polyurethane foam molded body using the same, and a method of manufacturing the polyurethane foam molded body.

In general, polyurethane foam is commercialized through physical/chemical high-temperature synthesis of isocyanate and a polyol mixture containing base polyol, catalyst, foam stabilizer, and water.

Meanwhile, as part of companies' EGS policy to reduce carbon dioxide in response to the recent climate change crisis, the scope of application of bio-based plastics as vehicle interior materials is increasing as a way to reduce carbon dioxide emissions, and recently, automobile seat foam, seat covers, and headlining. Various bio materials are being used in carpets, etc.

Meanwhile, in the case of automobile seat foam, there are specifications for VOCs, permanent compression set, rebound elasticity, elongation, tensile strength, hardness, and stress relief. However, when automobile seat foam is manufactured by applying only various conventional bio materials, the above specifications are not satisfied because the physical properties are deteriorated.

Accordingly, research is being conducted to improve the decline in physical properties by chemically modifying various bio-oils such as castor oil, soybean oil, and palm oil. However, the biomass content actually applied to automobile seat foam is extremely small, and the increase in secondary processing costs due to chemical modification causes the problem of increased product costs.

Therefore, under the above background, there is a continued need for research on polyurethane foam compositions that are environmentally friendly when applied to automobile seat foams and have excellent physical properties such as rebound elasticity, elongation, permanent compression set, stress relief, hardness, and compression energy loss rate. do.

Republic of Korea Patent Publication No. 10-2020-0069864

The present invention is intended to solve the above problems, and is an eco-friendly polyurethane foam composition containing bio-materials with excellent physical properties such as rebound elasticity, elongation, compression set, stress relief, hardness, and compression energy loss rate, and a polyurethane foam composition to which the same is applied. The purpose is to provide a polyurethane foam molded body and a method for manufacturing the polyurethane foam molded body.

The object of the present invention is not limited to the objects mentioned above. The object of the present invention will become clearer from the following description and may be realized by means and combinations thereof as set forth in the claims.

The polyurethane foam composition according to the present invention includes an eco-friendly compound containing dextrin, a biomaterial, polyol, a polyol mixture containing melamine resin and additives, and isocyanate.

The eco-friendly compound may be included in an amount of 5 to 15 parts by weight based on 100 parts by weight of the polyol.

The polyol includes a first polyol having a weight average molecular weight (Mw) of 7,000 to 8,000 and a second polyol having a weight average molecular weight (Mw) of 5,000 to 6,000, and the polyol is, based on the total weight, the first polyol 55 to 65% by weight and may include 35 to 45% by weight of the second polyol.

The polyol may include any one selected from polyethylene glycol (PEG), poly(tetramethylene ether) glycol (PTMG), and polypropylene glycol (PPG).

The melamine resin may be included in an amount of 0.5 to 3 parts by weight based on 100 parts by weight of the polyol.

The melamine resin may include at least one selected from the group consisting of melamine phosphate, melamine polyphosphate, and combinations thereof.

The additive may include at least one selected from the group consisting of a silicone foam stabilizer, catalyst, water, cross-linking agent, cell opener, and combinations thereof.

The cell opener may have a weight average molecular weight (Mw) of 4,000 to 6,000 and contain 70 to 80% by weight of ethylene oxide (EO).

The isocyanate may be included in an amount of 30 to 40 parts by weight based on 100 parts by weight of the polyol.

And the method of manufacturing a polyurethane foam molded body according to the present invention includes preparing a polyol mixture by mixing an eco-friendly compound containing dextrin, a bio material, polyol, melamine resin, and additives, and mixing isocyanate into the polyol mixture to prepare a polyurethane foam composition. It includes preparing and foaming the polyurethane foam composition.

Preparing the polyol mixture may include adding and mixing the melamine resin to the polyol and dispersing the eco-friendly compound in the mixture.

In the step of preparing the polyol mixture, the eco-friendly compound may be mixed in an amount of 5 to 15 parts by weight based on 100 parts by weight of the polyol.

In the step of preparing the polyol mixture, the melamine resin may be mixed in an amount of 0.5 to 3 parts by weight based on 100 parts by weight of the polyol.

The step of preparing the polyol mixture may be performed at a speed of 300 to 1,000 rpm for 20 to 60 seconds.

In the step of preparing the polyurethane foam composition, the isocyanate may be mixed in an amount of 30 to 40 parts by weight based on 100 parts by weight of the polyol.

The foaming can be performed at a pressure of 100 to 150 bar and a temperature of 20 to 50 °C.

And the polyurethane foam molded body according to the present invention is characterized in that it is manufactured by the polyurethane foam molded body manufacturing method.

The total volatile organic compound emission amount of the polyurethane foam molded body may be 2,497 ㎍/㎥ or less.

The polyurethane foam composition according to the present invention has the effect of having excellent physical properties even when the content of the bio material is increased by mixing dextrin, which is used as a bio material with excellent price competitiveness, and a melamine derivative with excellent dispersion stability in an appropriate amount.

The polyurethane foam molded body according to the present invention is environmentally friendly and has excellent physical properties such as rebound elasticity, elongation, permanent compression set, stress relief, hardness, and compression energy loss rate, so it can be usefully applied to automobile seat foam.

The effects of the present invention are not limited to the effects mentioned above. The effects of the present invention should be understood to include all effects that can be inferred from the following description.

Figure 1 confirms the storage stability according to the presence or absence of melamine resin in the polyol mixture.
Figure 2 shows the appearance of a polyurethane foam molded body according to a comparative example.
Figure 3 shows the formability confirmed by applying the example to an actual automobile mold.

The above objects, other objects, features and advantages of the present invention will be easily understood through the following preferred embodiments related to the attached drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosed content will be thorough and complete and so that the spirit of the present invention can be sufficiently conveyed to those skilled in the art.

In this specification, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

Unless otherwise specified, all numbers, values, and/or expressions used herein expressing quantities of components, reaction conditions, polymer compositions, and formulations are intended to represent, among other things, how such numbers inherently occur in obtaining such values. Since they are approximations reflecting the various uncertainties of measurement, they should be understood in all cases as being qualified by the term "approximately". Additionally, where a numerical range is disclosed herein, such range is continuous and, unless otherwise indicated, includes all values from the minimum to the maximum of such range inclusively. Furthermore, when such range refers to an integer, all integers from the minimum value up to and including the maximum value are included, unless otherwise indicated.

In this specification, when a range is stated for a variable, the variable will be understood to include all values within the stated range, including the stated endpoints of the range. For example, the range "5 to 10" includes the values 5, 6, 7, 8, 9, and 10, as well as any subranges such as 6 to 10, 7 to 10, 6 to 9, 7 to 9, etc. It will be understood that it also includes any values between integers that fall within the scope of the stated range, such as 5.5, 6.5, 7.5, 5.5 to 8.5, and 6.5 to 9, etc. Also, for example, the range "10% to 30%" includes values such as 10%, 11%, 12%, 13%, etc. and all integers up to and including 30%, as well as 10% to 15%, 12% to 12%, etc. It will be understood that it includes any subranges, such as 18%, 20% to 30%, etc., and any value between reasonable integers within the range of the stated range, such as 10.5%, 15.5%, 25.5%, etc.

The present invention relates to a polyurethane foam composition containing biomaterials.

The polyurethane foam composition according to the present invention includes an eco-friendly compound containing dextrin, a biomaterial, polyol, a polyol mixture containing melamine resin and additives, and isocyanate.

Next, each component constituting the polyurethane foam composition according to the present invention will be described in more detail as follows.

(A) Polyol mixture

The polyol mixture includes an eco-friendly compound, polyol, melamine resin, and additives.

The eco-friendly compound includes dextrin, a biomaterial. The dextrin is in the form of a solid phase and may be biomass extracted from corn starch. The dextrin is a material with 100% bio content.

When the solid dextrin is applied to urethane foam, it has the effect of reinforcing hardness. Therefore, by applying the dextrin, the present invention can increase the hardness of the composition and ultimately significantly reduce the amount of polyol used.

The eco-friendly compound may be included in an amount of 5 to 15 parts by weight based on 100 parts by weight of the polyol.

The polyol may include any one selected from polyethylene glycol (PEG), poly(tetramethylene ether) glycol (PTMG), and polypropylene glycol (PPG).

The polyol may include 55 to 65% by weight of the first polyol and 35 to 45% by weight of the second polyol, based on the total weight.

The first polyol may have a weight average molecular weight (Mw) of 7,000 to 8,000. Specifically, the first polyol has a trifunctional group, and polyethylene glycol (PEG) using a glycerin initiator and a cesium catalyst may be used.

The second polyol may have a weight average molecular weight (Mw) of 5,000 to 6,000. Specifically, the second polyol has a trifunctional group, and polyethylene glycol (PEG) using a glycerin initiator and a KOH catalyst may be used.

The melamine resin is used to secure long-term storage stability by stably dispersing solid dextrin in the liquid polyol in the composition.

The melamine resin may be included in an amount of 0.5 to 3 parts by weight based on 100 parts by weight of the polyol.

The melamine resin may include at least one selected from the group consisting of melamine phosphate, melamine polyphosphate, and combinations thereof.

The additive is a component for imparting various functionalities to the polyurethane adhesive composition, and known additives can be used without particular limitations as long as they do not impair the effect of the present invention.

The additive may include at least one selected from the group consisting of a silicone foam stabilizer, catalyst, water, cross-linking agent, cell opener, and combinations thereof.

The silicone stabilizer is used in the present invention to prevent cell collapse, increase structural stabilization, and provide elasticity, and is additionally applied to provide cell opening, and also to make cells dense and homogeneous. This ensures stability.

The silicone foam stabilizer may be a known silicone foam stabilizer commonly used in the field of foam technology, as long as it does not impair the effect of the present invention. For example, the silicone foam stabilizer may include one selected from the group consisting of organo polysiloxane, organo modified polysiloxane, and combinations thereof.

The silicone foam stabilizer may be included in an amount of 0.5 to 1.5 parts by weight based on 100 parts by weight of the polyol.

The catalyst is not particularly limited, and known catalysts commonly used in the foam technology field can be used. For example, the catalyst may be a metal catalyst such as a double metal cyanides catalyst. The catalyst may include an alcohol group, and N,N,N'-trimethyl-N'-hydroxyethyl-bis(aminoethyl) ether (N,N,N'-trimethyl-N'-hydroxyethyl-bis(aminoethyl) )ether), N,N-dimethylethanolamine (N,Ndimethylethanolamine), formic acid, and a combination thereof may be used.

The catalyst may be included in an amount of 0.1 to 2 parts by weight based on 100 parts by weight of the polyol.

The cell opener may have a weight average molecular weight (Mw) of 4,000 to 6,000 and contain 70 to 80% by weight of ethylene oxide (EO).

Specifically, the cell opener has a trifunctional group and can use polyethylene glycol (PEG) using a glycerin initiator and a KOH catalyst.

The cell opener may be included in an amount of 0.5 to 3 parts by weight based on 100 parts by weight of the polyol.

The cross-linking agent is a substance that turns polymer chains into branched chains or creates a network structure, and is used in the present invention for the purpose of providing rigidity and cell stability.

The cross-linking agent may be included in an amount of 0.1 to 2 parts by weight based on 100 parts by weight of the polyol.

The crosslinking agent is not particularly limited, and known agents commonly used in the foam technology field can be used. Preferably, the crosslinking agent may be diethanolamine.

The water can be used as a solvent to adjust the appropriate concentration in the present invention. The water may be included in an amount of 1 to 10 parts by weight based on 100 parts by weight of the polyol.

(B) Isocyanate

Isocyanate is an essential ingredient added when manufacturing polyurethane, and serves to cause a chemical reaction with the polyol. The isocyanate can play a role in equalizing the distribution of hard segments and soft segments within the polyurethane structure through the chemical reaction of the polyol.

The isocyanate may be included in an amount of 30 to 40 parts by weight based on 100 parts by weight of the polyol.

The isocyanate may be used without any particular limitation as long as it does not impair the effect of the present invention. Preferably, the isocyanate may be used having an NCO content of 35 to 40% by weight.

From another perspective, the present invention relates to a method for producing a polyurethane foam molded body. The method of manufacturing a polyurethane foam molded body according to the present invention includes preparing a polyol mixture by mixing an eco-friendly compound containing dextrin, a bio material, polyol, melamine resin, and additives, and mixing isocyanate with the polyol mixture to prepare a polyurethane foam composition. It includes manufacturing and foaming the polyurethane foam composition.

Before explaining the manufacturing method, a detailed description of the eco-friendly compounds, polyol, melamine resin, additives, and isocyanate used in the polyurethane foam molded body has been previously described, so detailed description will be omitted.

Each step of the polyurethane foam molded product manufacturing method according to the present invention will be described in detail as follows.

The step of preparing the polyol mixture may include adding and mixing the melamine resin to the polyol and then dispersing the eco-friendly compound in the mixture.

First, in the step of adding and mixing the melamine resin to the polyol, the mixture can be prepared by mixing 0.5 to 3 parts by weight of the melamine resin with respect to 100 parts by weight of the polyol. At this time, the mixture may be mixed at a speed of 300 to 1,000 rpm for 20 to 60 seconds.

Then, in the step of dispersing the eco-friendly compound, the polyol mixture can be prepared by dispersing the eco-friendly compound in the mixture.

Here, in the step of dispersing the eco-friendly compound, the polyol mixture can be prepared by mixing 5 to 15 parts by weight of the eco-friendly compound with 100 parts by weight of the polyol. At this time, the polyol mixture may be mixed at a speed of 300 to 1,000 rpm for 20 to 60 seconds.

Next, in the step of preparing the polyurethane foam composition, isocyanate may be mixed with the polyol mixture.

In the step of manufacturing the polyurethane foam composition, the isocyanate may be mixed with the polyol mixture in an amount of 30 to 40 parts by weight based on 100 parts by weight of the polyol.

Finally, in the foaming step, the polyurethane foam composition can be foamed to finally manufacture the polyurethane foam molded body. At this time, in the foaming step, foaming may be performed under the conditions of a pressure of 100 to 150 bar and a temperature of 20 to 50°C.

Specifically, in the foaming step, the polyurethane foam composition may be foamed using a mold. At this time, the foaming pressure is preferably 100 to 150 bar, and the temperature of the mold is preferably 20 to 50°C.

From another aspect, the present invention relates to a polyurethane foam molded body. The polyurethane foam molded body according to the present invention is characterized in that it is manufactured by the above polyurethane foam molded body manufacturing method. Finally, the total volatile organic compound emission amount of the polyurethane foam molded body manufactured by the manufacturing method according to the present invention may be 2,497 ㎍/㎥ or less.

Meanwhile, the polyurethane foam molded body according to the present invention is not limited to the fields in which it is used, but can be used in the automobile field. In particular, the polyurethane foam molded body is environmentally friendly and exhibits excellent physical properties such as rebound elasticity, elongation, compression set, stress relief, hardness, and compression energy loss rate, so it can be usefully applied as a seat foam for automobiles.

Hereinafter, the present invention will be described in more detail through specific examples. The following examples are merely examples to aid understanding of the present invention, and the scope of the present invention is not limited thereto.

Experimental Example 1 (Storage Stability)

Before conducting the experiment, polyol and isocyanate are mostly in liquid form and molded through a urethane foamer. Therefore, in order to add solid dextrin, it is important to uniformly disperse it in the liquid polyol system.

If dextrin is not uniformly dispersed and maintains stability, the optimal chemical reaction ratio between polyol and isocyanate is broken when foaming urethane foam, resulting in molding defects.

Therefore, in the present invention, in order to ensure dispersion stability when adding dextrin, the ingredients and amounts shown in Table 1 below were mixed, and the mixture was left at room temperature for a week to check the state of the mixture. And the results of the layer separation time are shown in Table 1 below.

At this time, the dispersion stabilizer was added to the polyol and mixed for 30 minutes at a speed of 500 pmp. Then, dextrin was added to the mixture and mixed for 30 seconds at a speed of 500 pmp.

ingredient
(part by weight) Comparative Example 1 Comparative Example 2 Comparative Example 3 Example 1 Example 2 polyol 100 100 100 100 100 dextrin 10 10 10 10 10 Dispersion stabilizer melamine resin 0 0 0 5 One silicone foaming agent 0 One One 0 One stabilizator 0 0 One 0 0 Layer separation point Gelation (solidification) 3days 2days stable stable 1. Polyol: PPG6001 product
2. Melamine resin: Melamine flame retardants such as melamine phosphate and melamine polyphosphate.
3. Stabilizer: A dispersion stabilizer used when producing styrene and acrylonite copolymer using polyol as a dispersion medium.

Figure 1 confirms the storage stability according to the presence or absence of melamine resin in the polyol mixture.

Referring to Figure 1 and Table 1, gelation occurred in Comparative Example 1 in which no dispersion stabilizer was used. In addition, Comparative Example 2 using only a silicone foam stabilizer and Comparative Example 3 using a silicone foam stabilizer and a conventional stabilizer had improved dispersion stability, but the storage stability effect was low, and as in parts (A) and (B), after 2 to 3 days. Precipitation occurred in the polyol mixture.

On the other hand, in Examples 1 and 2 in which melamine additives were added, dispersion stability increased and precipitation did not occur for one week. This is because the melamine resin used in Examples 1 and 2 acts as a thickener and prevents solid particles from rapidly settling through a slight increase in viscosity.

Therefore, in the present invention, by using melamine resin used as a dispersion stabilizer, the miscibility of dextrin and polyol was improved and precipitation of dextrin was prevented, thereby ensuring dispersion stability.

Experimental Example 2 (Bio-sheet foam molding)

Next, in order to confirm the performance of the dextrin content in the polyurethane foam composition, dextrin, polyol, and isocyanate were mixed with the ingredients and amounts shown in Table 2 below, and then foamed to prepare a polyurethane foam molded body for automobiles.

At this time, the specifications for the polyurethane foam molded products manufactured by dextrin content are shown in Table 2 below. Here, isocyanate was used in an amount of 30 to 40 parts by weight based on 100 parts by weight of polyol.

division Comparative Example 4 Example 3 Example 4 Comparative Example 5 Raw material natural
Material
Material name - dextrin dextrin dextrin form - Solid Solid Solid Addition amount
(based on 100 parts by weight of polyol) - 5 parts by weight 10 parts by weight 15 parts by weight polyol Specific gravity (-, 25℃) 1.0 1.1 1.2 1.3 Viscosity (cps, 25℃) 2,150 2,150 2,350 2.420 Storage stability stability stability stability stability Isocyanate NCO% 36.8% 36.8% form
(molded body) Ratio (Polyol:Isocyanate) 100:33 100:33 Cream Time (s) 10 11 8 9 Rise Time(s) 156 180 186 207 Settling(s) 4 16 39 45 Max. Height (mm) 163 159 148 136 note - - - Collapse

Referring to Table 2, in the polyurethane foam molded body for automobiles, as the dextrin content increased, the urethane cells grew larger and the foam failed to form and collapsed. It is believed that solid dextrin acts as a cell opener, destroying the cell structure during the foaming process.

And Figure 2 shows the appearance of the polyurethane foam molded body according to Comparative Example 5.

Referring to Figures 2 (A), (B), and (C), in Comparative Example 5, where 15 parts by weight of dextrin was used, large and non-uniform cells were formed due to the cell-opening effect of dextrin. These non-uniform cells act as a disadvantage in terms of comfort, such as lowering the vibration transmission rate of the automobile seat foam.

Therefore, it can be seen that when the dextrin content is used in a polyurethane foam composition of more than 15 parts by weight based on 100 parts by weight of polyol, an additional dispersion stabilizer is required.

Therefore, in the present invention, a silicone foam stabilizer and various additives were added to the polyol mixture in the components and amounts shown in Table 3 below.

ingredient
(part by weight) Comparative Example 6 Example 5 Example 6 (A) Eco-friendly compound 0 10 15 (B-1) polyol 1 60 60 60 (B-2) polyol 2 35 0 0 (B-3) polyol 3 0 40 40 (C)Melamine resin One One One (D)Cell opener 2 1.6 1.6 (E) Cross-linking agent 0.9 0.3 0.3 (F-1) Catalyst 1 0.15 0 0 (F-2) Catalyst 2 0 0.4 0.4 (F-3) Catalyst 3 0.15 0.15 0.15 (F-4) Catalyst 4 0.5 0.2 0.2 (G-1) Silicone foam stabilizer 1 0.7 0.3 0.3 (G-2) Silicone foam stabilizer 2 0.3 0.7 0.7 (H)water 2.60 2.3 2.3 (A) Eco-friendly compound: Dextrin
(B-1): PPG using trifunctional group, glycerin initiator and cesium catalyst, molecular weight (Mw): 7000 g/mol
(B-2): Polymer polyol obtained by dispersion polymerization of SM and AN
(B-3): PPG using trifunctional group, glycerin initiator and KOH catalyst, molecular weight (Mw): 6000 g/mol
(C): Melamine additive
(D): PPG with trifunctional group, glycerin initiator and KOH catalyst, molecular weight (Mw): 5000 g/mol, contains 70-80% of ethylene oxide
(E): Diethanolamine
(F-1~4): Amine or tin-based catalyst: 33% concentration catalyst of triethanolamine in dipropylene glycol or triethanolamine derivative or tinoctate or 60% ethanethiol-40% triethanolamine mixture.
(G-1~2): Silicone foam stabilizer: polysiloxane ether derivative

Accordingly, the foam molded body according to the present invention has improved urethane cells to be small and uniform.

Therefore, the present invention prevents the cell opener effect caused by dextrin by reducing the cell opener content in the existing prescription, improves cell uniformity by increasing the content of silicone stabilizer, and prevents precipitation by adding melamine resin as a dispersion stabilizer. Storage stability has been improved.

Experimental Example 3 (Optimization of bio-sheet foam using solid dextrin)

Continuing, in order to confirm whether the present invention can be used as a car seat cushion, Example 5, Example 6, and Comparative Example 6 were subjected to a Pilot-Test (molding) using a Hyundai Motor Company Sonata (DN8) Front Back mold and a robot machine foaming machine. gender evaluation) was conducted.

Here, the formability evaluation is a process of mixing raw materials using a robotic mechanical foamer and spraying them into the mold to check whether the foam is formed without unmolding.

Figure 3 shows the formability confirmed by applying the embodiment according to the present invention to an actual automobile mold. Referring to Figure 3, as a result of the moldability evaluation, Examples 5 and 6, in which 10 to 15 parts by weight of dextrin were used based on 100 parts by weight of polyol, all achieved good results without any unmolding such as collapse.

Next, after conducting a static load test for Examples 5 and 6, the results are shown in Table 4 below. Here, the static load test is a test that measures displacement by applying a certain load to the seat cushion seating area, and is conducted to check the support performance of the automobile seat cushion.

division Liquid ratio (weight ratio)
(Polyol:Iso) Formability Static load (mm) note standard Measures Example 5 (Dextrin
10 parts by weight) 100:34 Good 31 ± 3 33.3 pass 100:36 Good 29.5 pass 100:38 Good 29.3 pass 100:39 Good 24.4 fail Example 6 (Dextrin
15 parts by weight) 100:32 Good 33.0 pass 100:34 Good 28.4 pass 100:36 Good 27.1 fail 100:38 Good 24.5 fail

Referring to Table 4, as a result of the static load test, it was confirmed that the foaming conditions of Examples 5 and 6, in which 10 to 15 parts by weight of dextrin were used based on 100 parts by weight of polyol, satisfied the constant load standard. Specifically, it was confirmed that the moldability and static load standards were excellent when the weight ratio of polyol and isocyanate was 100:32 to 34.

Subsequently, the specimens that passed the static load test were selected to test the physical properties of foam materials for automobile seats, and the results are shown in Table 5 below.

division Comparative Example 6
(Management standards) Example 5 Example 6 produce
condition Dextrin addition amount - 10 parts by weight 15 parts by weight Liquid ratio (weight ratio)
(Polyol:Iso) - 100:36 100:34 Static load (mm) 31 ± 3 30.3 28.4 comfort
Properties Core Density (kg/m3) 65 68.5 71.7 40% compressive strength (Kpa) - 6.8 5.8 Compression energy loss rate (%) 21↓ 20.7 27.4 mechanical
Properties Tensile strength (Kpa) 100↑ 132 102 Elongation (%) 120↑ 124 120 durability Repeated compression change rate (%) 4↓ 1.3 0 note Passed overall 2 failed

Referring to Table 5, it was confirmed that the specimen according to Example 5 using 10 parts by weight of dextrin based on 100 parts by weight of polyol passed all physical property tests.

Subsequently, TVOCs, bio-mass content, and odor evaluation were conducted on the specimen according to Example 5 that satisfied the automobile seat cushion specifications, such as the formability evaluation, static load test, and material property test, and the results were as follows. It is shown in Table 6.

NO. item Comparative Example 6 Example 5 note General PU foam
(Dextrin not used) Dextrin 10 parts by weight One TVOCs emissions (㎍/㎥) 8,092 2,497 MS300-55 2 smell Dry 3.0 2.5 MS300-34 Wet 3.0 2.8 3 Bio-mass content (%) One 6 ISO-16620

Referring to Table 6, it was confirmed that the bio sheet foam (Example 5) using 10 parts by weight of dextrin per 100 parts by weight of polyol reduced TVOCs emissions by about 70% compared to general PU foam, and the odor evaluation was also superior to the existing one. I got the result. Specifically, it can be confirmed that the total volatile organic compound emission amount of the bio sheet foam was measured to be 2,497 ㎍/㎥ or less.

Therefore, in the present invention, by using dextrin as a solid biomaterial, TVOC is hardly detected, and when added to a urethane composition, dextrin acts as an organic filler and has the effect of increasing hardness. Therefore, there is an advantage that the content of the conventionally used SAN copolymer polyol does not need to be reduced or used at all.

In addition, in the case of dextrin derived from corn starch, the present invention has a lower unit price compared to petroleum polyol, and has the advantage of lowering the TVOC relatively, so that the additional VOCs reducing agent can be lowered or not added at all. there is. This has the advantage of relatively reducing costs.

Meanwhile, as a result of measuring the bio-mass content of the material in Example 5, it was confirmed that the bio-mass content, which was 1% based on the foam, increased to 6%.

In addition, in the present invention, dextrin, a material derived from corn starch, with 100% bio content was applied to the bio sheet foam, thereby improving the bio content in the sheet foam to 6%. This serves as an advantage in that the bio content can be increased without deteriorating physical properties, as it is confirmed that the bio content is around 3% when the bio sheet is manufactured using a typical existing method.

Therefore, the polyurethane foam composition according to the present invention has the effect of having excellent physical properties even when the content of the bio material is increased by mixing dextrin, which is used as a bio material with excellent price competitiveness, and a melamine derivative with excellent dispersion stability in an appropriate amount.

In addition, the polyurethane foam molded body according to the present invention is environmentally friendly and has excellent physical properties such as rebound elasticity, elongation, permanent compression set, stress relief, hardness, and compression energy loss rate, so it can be usefully applied to automobile seat foam.

Although the embodiments of the present invention have been described above, those skilled in the art will understand that the present invention can be implemented in other specific forms without changing its technical idea or essential features. . Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive.

Claims (18)

A polyol mixture containing an eco-friendly compound containing dextrin, a biomaterial, polyol, melamine resin, and additives; and
A polyurethane foam composition containing isocyanate.
According to paragraph 1,
A polyurethane foam composition comprising the eco-friendly compound in an amount of 5 to 15 parts by weight based on 100 parts by weight of the polyol.
According to paragraph 1,
The polyol is a first polyol having a weight average molecular weight (Mw) of 7,000 to 8,000; and
It includes a second polyol having a weight average molecular weight (Mw) of 5,000 to 6,000,
The polyol is based on its total weight,
55 to 65% by weight of the first polyol; and
A polyurethane foam composition comprising 35 to 45% by weight of the second polyol.
According to paragraph 1,
A polyurethane foam composition wherein the polyol includes any one selected from polyethylene glycol (PEG), poly(tetramethylene ether) glycol (PTMG), and polypropylene glycol (PPG).
According to paragraph 1,
The polyurethane foam composition comprising 0.5 to 3 parts by weight of the melamine resin based on 100 parts by weight of the polyol.
According to paragraph 1,
The melamine resin is a polyurethane foam composition comprising at least one selected from the group consisting of melamine phosphate, melamine polyphosphate, and combinations thereof.
According to paragraph 1,
The additive is a polyurethane foam composition comprising at least one selected from the group consisting of a silicone foam stabilizer, catalyst, water, crosslinking agent, cell opener, and combinations thereof.
In clause 7,
The cell opener is a polyurethane foam composition having a weight average molecular weight (Mw) of 4,000 to 6,000 and containing 70 to 80% by weight of ethylene oxide (EO).
According to paragraph 1,
The polyurethane foam composition comprising 30 to 40 parts by weight of the isocyanate based on 100 parts by weight of the polyol.
Preparing a polyol mixture by mixing an eco-friendly compound containing dextrin, a biomaterial, polyol, melamine resin, and additives;
Preparing a polyurethane foam composition by mixing isocyanate with the polyol mixture; and
A method of manufacturing a polyurethane foam molded body comprising the step of foaming the polyurethane foam composition.
According to clause 10,
The step of preparing the polyol mixture includes mixing 5 to 15 parts by weight of the eco-friendly compound with respect to 100 parts by weight of the polyol.
According to clause 10,
The step of preparing the polyol mixture is a method of manufacturing a polyurethane foam molded body in which the melamine resin is mixed in an amount of 0.5 to 3 parts by weight based on 100 parts by weight of the polyol. According to clause 10,
The step of preparing the polyol mixture is
Adding and mixing the melamine resin to the polyol; and
A method of manufacturing a polyurethane foam molded body comprising the step of dispersing the eco-friendly compound in the mixture.
According to clause 10,
The method of preparing the polyol mixture is mixing at a speed of 300 to 1,000 rpm for 20 to 60 seconds.
According to clause 10,
In the step of manufacturing the polyurethane foam composition, the isocyanate is mixed in an amount of 30 to 40 parts by weight based on 100 parts by weight of the polyol.
According to clause 10,
A method of manufacturing a polyurethane foam molded body, wherein the foaming is performed at a pressure of 100 to 150 bar and a temperature of 20 to 50 ° C.
A polyurethane foam molded body manufactured by the manufacturing method of claim 10.
According to clause 17,
A polyurethane foam molded body wherein the total volatile organic compound emission amount of the polyurethane foam molded body is 2,497 ㎍/㎥ or less.