KR100522624B1 - Semi-rigid polyurethane foam formulation for automotive interiors - Google Patents

Abstract

The present invention relates to a semi-rigid urethane foam composition of the vehicle interior material, and more particularly, the instrument panel and headrest installed to give a cushion feeling to the vehicle and to prevent injury by absorbing and mitigating the impact of the vehicle occupants in the vehicle during a vehicle crash. The present invention relates to a composition that can significantly reduce the production cycle by shortening the reaction time required to form a semi-rigid urethane foam constituting a variety of interior materials, such as dash panels, floor consoles and sun visors, thereby improving productivity.

To this end, the present invention, in the semi-rigid urethane foam composition of the vehicle interior material, using a glycerin (Glycerin) as a starting material ether obtained by the reaction reaction of ethylene oxide (Propylene Oxide) (EO / PO) in a high temperature and high pressure reactor ) As a polyol, a main polyol having a hydroxyl value of 26 to 30 and a molecular weight of 5,000 to 7,000 and a triethanol amine closely related to the hardness retention and productivity of the product are blended. A crosslinker, a crosslinking agent, a first catalyst which affects the blowing reaction and the properties of the moldability compared to the properties of the urethane foam, and the gel reaction and the properties of the urethane foam Intermediate obtained from the condensation reaction of aniline and formalin with a second catalyst that affects the properties of the contrast formability, a chemical blowing agent that affects the foam density, and aniline Prepolymer (modified MDI) prepared by pre-reacting polymerized MDI, which is a product obtained by phosgene-forming phosgene, is composed of isocyanate having an NCO content of 27% by weight. do.

Description

Semi-rigid polyurethane foam formulation for automotive interiors

The present invention relates to a semi-rigid urethane foam composition of the vehicle interior material, and more particularly, the instrument panel and headrest installed to impart a cushion feeling to the vehicle and to prevent injuries by absorbing and mitigating the impact of the vehicle occupants in the vehicle during a vehicle crash. The present invention relates to a composition that can significantly reduce the production cycle by shortening the reaction time required to form a semi-rigid urethane foam constituting a variety of interior materials, such as dash panels, floor consoles and sun visors, thereby improving productivity.

The urethane foam constituting the interior material installed in the vehicle is transformed into a foam layer having a cushioning property by spraying a liquid composition on a panel placed in a mold and then foaming it under a predetermined pressure and temperature. The time required for the foaming process to form the urethane foam foamed in the cycle had an interval of 6 to 7 minutes on average, and the total time for the remaining work of the panel forming and the mold-deformed urethane foam-forming panel was added together. In fact, the actual production intervals had cycles of 10 to 12 minutes, resulting in a severe decrease in productivity.

The reason for the decrease in productivity as described above is that the time taken for the reaction of the liquid composition to foam and harden is too slow, and the main factor is the slow process as described above. In order to meet the number of production, a large number of molds are separately installed to cope with the slow curing process in a positive manner.

However, in order to install a large number of molds as described above, there was a problem in that a separate production line and a corresponding number of people secured and costs for installing molds were not provided, but a separate means for solving them was not provided. to be.

The present invention is provided to solve the above conventional problems, the technical problem to be achieved by the present invention, the urethane foamed to various panels to provide cushioning properties to ensure the safety of the occupants, to absorb noise and create a comfortable in-vehicle environment It greatly reduces the time required to form the foam, which can lead to a shortening of the cycle required for the final panel manufacturing time, thereby reducing the number of equipment investments and labor required for installing a large number of conventional foam molds. have.

To this end, the present invention, in the semi-rigid urethane foam composition of the vehicle interior material, using a glycerin (Glycerin) as a starting material ether obtained by the reaction reaction of ethylene oxide (Propylene Oxide) (EO / PO) in a high temperature and high pressure reactor ) As a polyol, a main polyol having a hydroxyl value of 26 to 30 and a molecular weight of 5,000 to 7,000 and a triethanol amine closely related to the hardness retention and productivity of the product are blended. A crosslinker, a crosslinking agent, a first catalyst which affects the blowing reaction and the properties of the moldability compared to the properties of the urethane foam, and the gel reaction and the properties of the urethane foam Intermediate obtained from the condensation reaction of aniline and formalin with a second catalyst that affects the properties of the contrast formability, a chemical blowing agent that affects the foam density, and aniline Prepolymer (modified MDI) prepared by pre-reacting polymerized MDI, which is a product obtained by phosgene-forming phosgene, is composed of isocyanate having an NCO content of 27% by weight. do.

Hereinafter, a detailed description of the semi-rigid urethane foam composition of the vehicle interior according to the present invention.

The present invention relates to a urethane foam composition for forming a urethane foam for use in various interior materials of the vehicle, significantly reducing the process time required to form a urethane foam of the foam formed on the various interior materials of the vehicle to other processes Smooth production can be progressed by reducing the gap between the two and the time. Accordingly, the purpose is to secure a urethane foam forming line, add a production line facility, and reduce the space and cost required for the workforce.

In order to achieve the above object, the present invention, in the composition to form a urethane foam of a radius that is foamed in various interior materials mounted inside the vehicle to absorb shock and noise and provide convenience to the passenger, glycerin (Glycerin) Is an ether-based polyol obtained by EO / PO (Ethylene Oxide / Propylene Oxide) addition reaction in a high temperature and high pressure reaction tank using starting material as the starting material, and the hydroxyl value of the terminal group is 26 ~ It prepares 60-65 wt% of main polyol which is 30 and has a molecular weight of about 5,000 ~ 7,000 and influences the basic physical properties of semi-finished urethane foam.

The main polyol is a polyol prepared to allow rapid reaction progressing and curing, thereby improving the reaction degree of NCO, a relative reactant, by improving the degree of ethylene (Ethylene Oxide) Capped, which is less steric hindrance effect than that of PO (Propylene Oxide) in the terminal polyol terminal structure. It is easy to access, and is prepared to shorten the progress of the rapid resination reaction and the overall curing time, and affects the productivity and reactivity closely and affects the hardness and physical properties of the final urethane foam.

Therefore, when the hydroxyl value of the end group in the above (OH-Value) or molecular weight and EO / PO (Ethylene Oxide / Propylene Oxide) ratio is different affects the hardness and physical properties of the urethane foam it is difficult to obtain the desired final product It is difficult, and if the total content exceeds 65% by weight, it may cause cracking or chipping of the urethane foam.If the content is less than 60% by weight, the time required for the formation of the urethane foam is delayed and Shrinkage is deepened, the shape is distorted, and the foam material is solidified, which causes a problem of deterioration of cushioning properties. Therefore, the mixing ratio must be strictly observed.

And 0.9 to 1.4% by weight of a cross linker (Triethanol Amine) mainly used to adjust the reactivity of the main polyol in the urethane foam field as a crosslinking agent closely related to the maintenance of hardness and productivity of urethane foam Mix.

When the total content of the cross linker exceeds 1.4 wt%, an unfilled phenomenon occurs due to a decrease in the density of the urethane foam due to an increase in hardness of the urethane foam and a faster reaction than the intended reactivity, and a content of 0.9 If less than the weight%, there is a problem in that the moldability is lowered due to the increase in leakage caused by the productivity delay and flowability due to the decrease in hardness and reactivity.

In addition, by improving the blowing reaction and reaction in the mixture of the main polyol and the cross linker, the formability of the urethane foam is minimized by minimizing the amount of amine that remains in the foam agent and adversely affects the skin covering the urethane foam. 0.01 to 0.2% by weight of the first catalyst (reactive strong active catalyst) which determines the properties of the mixture.

When the content of the first catalyst exceeds 0.2% by weight, an imbalance of the urethane foam formation reaction occurs, resulting in unstable gel and curing due to the deterioration of moldability and excessive foaming reaction, and the content is 0.01% by weight. When less than%, an imbalance of the urethane foam forming reaction occurs, thereby causing a problem that adversely affects the increase in density and physical properties due to the deterioration of the moldability and the foaming reaction.

In addition, 0.19 to 0.5 of the active catalyst-based second catalyst, which is a material for curing the gel and improves the properties of the molding side relative to the physical properties of the urethane foam, and is a property for curing property, in the mixture of the main polyol, the cross linker, and the first catalyst. Mix by weight.

The amount of the second catalyst should be adjusted so that there is no problem in moldability in consideration of the mutual relationship with the crosslinking agent. When the content of the second catalyst exceeds 0.5% by weight, an imbalance of the urethane foam forming reaction occurs and the moldability is increased. This decreases, the density decreases due to the acceleration of the gel reaction, and a sudden change in the viscosity of the reactant occurs. When the content is less than 0.19% by weight, an imbalance of the urethane foam forming reaction occurs, resulting in deterioration of moldability and intention of delaying the gel reaction. The problem of not exhibiting the cured properties is generated.

The main polyol, the cross linker, the first catalyst and the second catalyst are mixed with a 1.0 to 1.5% by weight of a chemical blowing agent (Blowing agent) that determines the density and degree of foaming of the urethane foam.

The chemical blowing agent should be selected in consideration of the equivalent of the chemical reaction amount with the isocyanate (relative material) to be described later, if the content exceeds 1.5% by weight of the physical properties due to the density decrease of the urethane foam It causes a change and the urethane foam hardens due to the difference in chemical reaction with isocyanate, which causes the increase of shrinkage, and when the content is less than 1.0% by weight, it causes a change in physical properties due to the increase in density of the urethane foam. A problem occurs.

In addition, the polymerization is a product obtained by phosgene forming an intermediate obtained by condensation of aniline and formalin in a mixture of the main polyol, a cross linker, a first catalyst, a second catalyst and a chemical blowing agent. A prepolymer (prepolymer or modified MDI) prepared by reacting MDI with a specific polyol in advance and has an NCO content of 27% by weight and isocyanate to maintain moldability and improve the satisfaction of physical properties by preventing rapid viscosity change of reactants due to rapid reaction. The total composition is achieved by mixing 37-30% by weight of the acid salt.

The isocyanate is a two-component raw material that reacts with a chemical blowing agent to form a urethane chain by reacting a terminal NCO group with a hydroxyl group (OH group) in the mixture, and when the content exceeds 37% by weight, urethane foam This hardening causes hardening of the shrinkage, and decreases the filling force due to the gradual fibrosis reaction. If the content is less than 30% by weight, it adversely affects the development performance due to the change of the physical properties of the urethane foam, The problem of becoming prone to trouble occurs.

In the above, the first catalyst is an amine-based catalyst having a strong blow activity for the rapid curing of the object of the present invention, the second catalyst is a reactive amine-based catalyst resistant to gel and cure activity Preference is given to using.

On the other hand, in the composition, the hydroxyl value of the end group prepared by the same method as the main polyol (OH-Value) is 33 ~ 37, the molecular weight is about 4000 ~ 5600 and supplements the main polyol to supplement the physical properties and curing of the urethane foam Physically homogeneously dispersed styrene acrylonitrile (SAN) may be prepared by selectively mixing 0.9 to 1.4% by weight with respect to the total weight of the final product to improve the initial curing properties of the urethane foam.

If the content of the styrene acrylonitrile exceeds 1.4% by weight, it is a factor of increasing the hardness and cost. If the content is less than 0.9% by weight, the productivity is reduced due to the initial hardening deterioration and the worker's carelessness immediately after the product demoulding. There is a problem that may be the cause of failure by handling.

When forming the urethane foam with the composition according to the present invention prepared at the composition ratio as described above, the time to form a urethane foam is significantly reduced from 6 to 7 minutes to less than 2 minutes compared to the conventional time to cycle with other processes This allows you to reduce the cycle time from 5 to 6 minutes for the entire manufacturing process.

As described above, the present invention can significantly reduce the time required to form the urethane foam of the foam to be foamed to the interior material installed inside the vehicle, so that the foaming process can be matched to the cycles of other processes, which is unnecessary in the related art. It is possible to reduce the foam mold that must be installed a lot, thereby reducing the number of workers and the manpower put into the work can reduce the cost.

Claims (5)

In the semi-rigid urethane foam composition of the vehicle interior material, Ethylene Oxide / Propylene Oxide (EO / PO) polyol obtained by EO / PO (Ethylene Oxide / Propylene Oxide) addition reaction in glycoline (Glycerin) as starting material. ) Is 26 ~ 30, molecular weight is about 5,000 ~ 7,000, and it improves the degree of ethylene (Ethylene Oxide) Capped, which has less steric hindrance effect than PO (Propylene Oxide) in the polyol terminal structure to allow rapid reaction progress and hardening. Main polyol synthesized to facilitate the reaction approach of the reactant NCO, to shorten the progress of the rapid resin reaction and overall curing time,  A cross linker which is a crosslinking agent blended with triethanol amine closely related to maintaining the hardness and productivity of the product,  A first catalyst which affects the blowing reaction and the properties of the moldability compared to the physical properties of the urethane foam; A second catalyst which affects the gel reaction and the properties of the moldability compared to the physical properties of the urethane foam; Chemical blowing agents that affect foam density and A prepolymer (modified MDI) prepared by pre-reacting a polymerized MDI, which is a product obtained by phosphogenation of an intermediate obtained in the condensation reaction between aniline and formalin, with a specific polyol, has a NOC content of 27% by weight. Semi-urethane foam composition of the vehicle interior, characterized in that the composition is composed of isocyanate (%). According to claim 1, wherein the main polyol is 60 to 65% by weight based on the total weight, the cross linker is 0.9 to 1.4% by weight relative to the total weight, the first catalyst is 0.01 to 0.2% by weight relative to the total weight, the second catalyst Is 0.19 to 0.5% by weight based on the total weight, the chemical blowing agent is 1.0 to 1.5% by weight relative to the total weight, isocyanate is semi-hardness of the vehicle interior, characterized in that the composition ratio of 37 to 30% by weight Urethane foam composition. According to claim 1, wherein the hydroxyl value of the end group prepared by the same method as the main polyol (OH-Value) of 33 to 37, the molecular weight of about 4000 to 5600 physically homogeneously dispersed styrene acrylonitrile (SAN) A semi-rigid urethane foam composition of the vehicle interior. According to claim 3, The styrene acrylonitrile semi-rigid urethane foam composition of the vehicle interior, characterized in that 0.9 to 1.4% by weight relative to the total weight. The method according to claim 1 or 2, The first catalyst is an amine-based catalyst having a strong blow activity for fast curing, and the second catalyst is a reactive amine catalyst having a strong gel and cure activity. Semi-hard urethane foam composition of the interior material.