Background technology
The production of flexible PU foam is a common procedure, and a lot of rules of origin are in it.The foam more complicated of automotive seat need be at in-mold molding.In order to reach enough slakings, die surface needs heat.Foam process relatively more commonly used at present is a cold-curing technology, this arts demand heating mould, and die temperature approximately is controlled at about 65 degree, general about 5 minutes of the demould time of product.
During running car, because road jolts, can produce vibrations, these vibrations can be transmitted on one's body the occupant by seat.Low-frequency vibrations are propagated by high rebound foam, can bring discomfort to passenger.Studies show that in the range of frequency of 0-20HZ, human body is relatively more responsive; This scope internal resonance frequency is high more, and human body sensory is uncomfortable more.Therefore, reduce interior resonant frequency of this scope and the vibrations transmission rate under the resonant frequency, seem important.
By test foamy hysteresis loss, can be used for assessing the foamy weather resistance, thereby can assess the influence of foam the automotive seat quality.
By test foamy stress relaxation, can assess the speed that passenger sink, thus the comfortableness of assessment automotive seat.
Molecular weight 3000-6000 is generally adopted in polyurethane moulding foaming at present, and the polyvalent alcohol of functionality about 3 is as basic polyethers, by with isocyanate reaction, obtain corresponding seat foam.This foam can satisfy the general physical performance, but is difficult to satisfy the client simultaneously to shock damping hysteresis loss, the requirement of aspects such as stress relaxation.When the foam density that this basis polyethers manufacturing obtains was 55Kg/m3, stress relaxation was 15%, and hysteresis loss is 21%, and resonant frequency is 3.6, and the transmission rate under the resonant frequency is 5.8.
Embodiment
Provide preferred embodiment of the present invention below, and described in detail, enable to understand better function of the present invention, characteristics.
Embodiment 1
The polyurethane foamed material of embodiment 1 is made of tolylene diisocyanate (blow index is 95) and basic mixture, and described basic mixture is made of following composition: 1) basic polyethers, and this basis pfpe molecule amount is at least greater than 6000, and functionality is greater than 3.Present embodiment employing molecular weight is 12000 basic polyethers GEP1208Y, and consumption is 47.6 weight percents; 2) polymer polyatomic alcohol, this polyvalent alcohol are one or more polymer polyatomic alcohols or the improved polyvalent alcohol of polymkeric substance, and present embodiment adopts H45Y, and consumption is 47.6 weight percents; 3) linking agent is DEOA, and consumption is 1.43 weight percents; 4) whipping agent is a water, and consumption is 2.2 weight percents; 5) tensio-active agent is a silicone oil, is specially B8737 and B3724, and wherein the B8737 consumption is 0.48 weight percent, and the B3724 consumption is 0.29 weight percent; 6) catalyzer is BDE and TA33, and wherein the BDE consumption is 0.10 weight percent, and the TA33 consumption is 0.30 weight percent.
Embodiment 2
The polyurethane foamed material of embodiment 2 is made of tolylene diisocyanate (blow index is 98) and basic mixture, and described basic mixture is made of following composition: 1) basic polyethers, and this basis pfpe molecule amount is at least greater than 6000, and functionality is greater than 3.Present embodiment employing molecular weight is 12000 basic polyethers GEP1208Y, and consumption is 57.1 weight percents; 2) polymer polyatomic alcohol, this polyvalent alcohol are one or more polymer polyatomic alcohols or the improved polyvalent alcohol of polymkeric substance, and present embodiment adopts H45Y, and consumption is 38.1 weight percents; 3) linking agent is DEOA, and consumption is 1.5 weight percents; 4) whipping agent is a water, and consumption is 2.13 weight percents; 5) tensio-active agent is a silicone oil, is specially B8737 and B3724, and wherein the B8737 consumption is 0.48 weight percent, and the B3724 consumption is 0.29 weight percent; 6) catalyzer is BDE and TA33, and wherein the BDE consumption is 0.05 weight percent, and the TA33 consumption is 0.35 weight percent.
Embodiment 3
The polyurethane foamed material of embodiment 3 is made of tolylene diisocyanate (blow index is 91) and basic mixture, and described basic mixture is made of following composition: 1) basic polyethers, and this basis pfpe molecule amount is at least greater than 6000, and functionality is greater than 3.Present embodiment employing molecular weight is 12000 basic polyethers GEP1208Y, and consumption is 66.6 weight percents; 2) polymer polyatomic alcohol, this polyvalent alcohol are one or more polymer polyatomic alcohols or the improved polyvalent alcohol of polymkeric substance, and present embodiment adopts H45Y, and consumption is 28.6 weight percents; 3) linking agent is DEOA, and consumption is 1.43 weight percents; 4) whipping agent is a water, and consumption is 2.2 weight percents; 5) tensio-active agent is a silicone oil, is specially B8737 and B3724, and wherein the B8737 consumption is 0.40 weight percent, and the B3724 consumption is 0.21 weight percent; 6) catalyzer is BDE and TA33, and wherein the BDE consumption is 0.10 weight percent, and the TA33 consumption is 0.30 weight percent.
Embodiment 4
The polyurethane foamed material of embodiment 3 is made of tolylene diisocyanate (blow index is 95) and basic mixture, and described basic mixture is made of following composition: 1) basic polyethers, and this basis pfpe molecule amount is at least greater than 6000, and functionality is greater than 3.Present embodiment employing molecular weight is 12000 basic polyethers GEP1208Y, and consumption is 76.9 weight percents; 2) polymer polyatomic alcohol, this polyvalent alcohol are one or more polymer polyatomic alcohols or the improved polyvalent alcohol of polymkeric substance, and present embodiment adopts H45Y, and consumption is 19.35 weight percents; 3) whipping agent is a water, and consumption is 2.5 weight percents; 4) tensio-active agent is a silicone oil, is specially B8737 and B3724, and wherein the B8737 consumption is 0.5 weight percent, and the B3724 consumption is 0.3 weight percent; 5) catalyzer is BDE and TA33, and wherein the BDE consumption is 0.10 weight percent, and the TA33 consumption is 0.35 weight percent.
Obtained foam physical properties test result is as shown in table 1.
This test is taken a sample with sample piece mould.Sample piece mould is of a size of 380mm * 380mm * 100mm.The temperature of sample piece mould is controlled at about 65 degree.
25%IFD, 50%IFD, the test materials used puller system test of stress relaxation and hysteresis loss, the model of puller system is.
Resonant frequency, data such as acceleration transmission rate are tested by bumper and are obtained.
The method of testing above-mentioned polyurethane foam performance is:
1) 25%IFD, the pressure head diameter is 200mm, testing method is according to TSM7100G;
2) 50%IFD, the pressure head diameter is 200mm, testing method is according to TSM7100G;
3) hysteresis loss, the pressure head diameter is 200mm, testing method is according to TSM7100G;
4) stress relaxation, the pressure head diameter is 200mm, testing method is according to TSM7100G;
5) resonant frequency, briquetting weight 50KG, constant acceleration is 0.2g, sweep rate is 1-20HZ;
6) transmission rate under the resonant frequency, briquetting weight 50KG, constant acceleration is 0.2g, sweep rate is 1-20HZ;
7) transmission rate during 6HZ, briquetting weight 50KG, constant acceleration is 0.2g, sweep rate is 1-20HZ;
8) transmission rate is 1 o'clock a vibration frequency, briquetting weight 50KG, and constant acceleration is 0.2g, sweep rate is 1-20HZ;
Above-described, be preferred embodiment of the present invention only, be not in order to limiting scope of the present invention, the above embodiment of the present invention can also be made various variations.Be that every simple, equivalence of doing according to the claims and the description of the present patent application changes and modification, all fall into the claim protection domain of patent of the present invention.