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Semi-rigid polyurethane foam and preparation method thereof, sandwich component and preparation method and use thereof
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A polyurethane foam and semi-rigid technology, applied in chemical instruments and methods, layered products, synthetic resin layered products, etc., can solve problems such as high loss rate of mechanical properties, insufficient low-temperature performance, and blasting of airbags, etc. Good tactility, good rebound, and improved safety
Active Publication Date: 2022-07-15
WANHUA CHEM BEIJING +1
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[0003] Patent CN 105820303A discloses low-density polyurethane foam for automobile dashboards and its preparation method and application. The raw material cost of the foam formulation system is high, the loss rate of the mechanical properties of the prepared foam is too large after aging, the rebound rate is low, the comfort is poor, and the low temperature Performance only considers the foam and not the composite substrate, insufficient low temperature performance after part aging
[0004] Therefore, it is necessary to provide a technical solution to solve the problems existing in the prior art, such as comfort, low temperature resistance, aging resistance, and airbag bursting, which need to be strengthened
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[0071] The preparation method of isocyanate component 1 is as follows: in a reaction kettle at 45° C., in parts by mass, 30 parts of WANANTEMDI-50 and 70 parts of WANNATE PM-200 are put into the reaction kettle, and the material is discharged after stirring; the NCO content is 32wt%, The viscosity at 25°C was 70 mPa·s.
[0072] The preparation method of isocyanate component 2 is as follows: in a reaction kettle at 45 ° C, according to parts by mass, 55 parts of WANANTEMDI-50 and 22 parts of polyether polyol 3 are put into the reaction kettle, stirred evenly and then heated to 70 ° C, and then put into 23 parts. WANNATE PM-200 was mixed evenly and then discharged; the NCO content was 25wt%, and the viscosity at 25°C was 300mPa·s.
[0073] Isocyanate component 3 used WANNATE 80693.
Embodiment and
[0074] The preparation method of embodiment and comparative example polyurethane foam sample:
[0075] Step 1, respectively control the temperature of the isocyanate component and the isocyanate-reactive component to be 25°C;
[0076] In step 2, the isocyanate component and the isocyanate-reactive component are injected into a mold through a high-pressure casting machine for reaction, and after the reaction is completed, the mold is opened to obtain a polyurethane foam, and the filling density of the polyurethane foam is 185kg / m 3 ; The pressure of the high-pressure casting machine is 150bar, the mold temperature is 45°C, and the pressure holding time is 80 seconds.
[0077] The preparation method of embodiment and comparative example sandwich component:
[0078] Step 1, respectively control the temperature of the isocyanate component and the isocyanate-reactive component to be 25°C;
[0079] Step 2: Assemble 3mm thick modified polypropylene base material (purchased from Kin...
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Abstract
The invention provides a semi-rigid polyurethane foam obtained by reacting an isocyanate component and an isocyanate-reactive component, wherein the isocyanate-reactive component comprises: a polyether polyol with an ethylene oxide content of 5-50 wt % 1. Polyether polyol with ethylene oxide content of 55-95 wt% 2, polymer polyol, namely graft copolymerization type polyether polyol, polyester polyol 1, catalyst, foaming agent, surfactant. The polyurethane foam can be used for the preparation of a multi-layer structure without adding an additional binder, and has excellent mechanical properties, heat aging resistance, damp heat aging resistance, weather alternating aging resistance, and excellent blasting reliability and comfort. . The present invention also provides a preparation method of the polyurethane foam, and a preparation method and use of a sandwich component comprising the polyurethane foam.
Description
technical field [0001] The present invention relates to a semi-rigid polyurethane foam, particularly a semi-rigid polyurethane foam for instrument panels, a method for preparing the material, and a sandwich component comprising the polyurethane foam and a method for preparing the same. Background technique [0002] The dashboard of a car is one of the most important parts in the car interior, and it needs to have a comfortable feel and good shock absorption performance. Semi-rigid polyurethane foam is widely used in the preparation of instrument panels for mid-to-high-end vehicles in the market due to its good hardness, elasticity, and excellent energy absorption, shock resistance, and impact resistance. In recent years, with the development of the industry, the upgrade of consumer demand, and the improvement of safety and comfort, the materials used for automotive dashboards also need to further improve their performance. In addition to the conventional performance, the pe...
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