CN111518260A - Novel polyurethane foam composition - Google Patents
Novel polyurethane foam composition Download PDFInfo
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- CN111518260A CN111518260A CN202010494461.4A CN202010494461A CN111518260A CN 111518260 A CN111518260 A CN 111518260A CN 202010494461 A CN202010494461 A CN 202010494461A CN 111518260 A CN111518260 A CN 111518260A
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Abstract
The invention provides a novel polyurethane foam composition, which comprises a component A and a component B, wherein the component A is isocyanate and is 100 parts by weight, and the component B is a white material and comprises the following components in parts by weight: 75-110 parts of a polyol composition; 5-25 parts of polydimethylsiloxane; 1-2 parts of a first cross-linking agent, namely dipropylene glycol (DPG); 2-5 parts of a second crosslinking agent dicumyl peroxide (DCP); 10-21 parts of nano mineral crystal; 0.3-1 part of catalyst stannous octoate; 5-15 parts of foaming agent water; 1-4 parts of foam stabilizer silicone oil. The polyurethane foam product prepared by the invention has better extensibility and sealing property, and can meet the requirements of updating and upgrading electronic products.
Description
Technical Field
The invention relates to a polyurethane foam product, in particular to a novel polyurethane foam composition.
Background
The consumer market has an increasing demand for electronic products. In particular, the demand for portable electronic devices, such as telephones, game controllers, music players, flat panel televisions, notebook computers, and tablet computers, is increasing. With the updating of portable electronic equipment, new products are designed to be thinner and thinner, and for ultrathin electronic products, due to the limited internal space, ultrathin sealing gaskets and adhesive tapes are needed to be used.
Compared with polyethylene or acrylic foam gaskets and adhesive tapes, the polyurethane foam gasket and adhesive tape have better tensile extensibility, thereby having better stress dispersion and vibration absorption capabilities, and when other elements connected with the gasket and the adhesive tape are deformed due to temperature or external force, the polyurethane foam gasket and the adhesive tape can have better sealing performance and are not easy to break and deform.
Therefore, there is a need to provide a better-performing polyurethane foam product to meet the requirements of electronic product upgrading.
Disclosure of Invention
According to the invention, the prepared polyurethane foam product has better extensibility and sealing property by providing the novel polyurethane foam composition, and the requirement of updating and upgrading electronic products can be met.
The embodiment of the invention provides a novel polyurethane foam composition, which comprises a component A and a component B, wherein the component A is isocyanate, and the weight part of the component A is 100 parts; the component B is a white material and comprises the following components in parts by weight:
75-110 parts of a polyol composition;
5-25 parts of polydimethylsiloxane;
1-2 parts of a first crosslinking agent dipropylene glycol (DPG);
2-5 parts of a second crosslinking agent dicumyl peroxide (DCP);
10-21 parts of nano mineral crystal;
0.3-1 part of catalyst stannous octoate (T9);
5-15 parts of foaming agent water;
1-4 parts of foam stabilizer silicone oil (CGY-3).
Preferably, the isocyanate comprises 80 to 90 wt% of diphenylmethane diisocyanate and 10 to 20 wt% of toluene diisocyanate.
Preferably, the polyol composition comprises: the polyether polyol with the hydroxyl value of 150-300 and the functionality of 3-8 and the polyester polyol with the hydroxyl value of 20-500 and the functionality of 2-3 are prepared, wherein the weight percentage of the polyether polyol is 60-75%, and the weight percentage of the polyester polyol is 25-40 wt%.
Wherein:
according to the invention, by controlling the compositions of the isocyanate and the polyol composition and the addition amounts of the isocyanate, the polyol composition, the first crosslinking agent, the second crosslinking agent, the foaming agent water, the nano-mineral crystal, the catalyst T9 and the like, the gel rate and the foaming rate reach a balance value, and the foam has stable size and good smoothness.
The extension performance of the polyurethane foam can be improved by adding the polydimethylsiloxane, and meanwhile, the flame retardance is cooperated.
The nano mineral crystal has the effects of three aspects, the first aspect is that the carbon dioxide gas generated by isocyanate and water is divided into nano bubbles, so that the cells are more uniform; the second aspect is that the nano pores of the nano mineral crystals can delay the release speed of gas, thereby reducing the foaming rate; in a third aspect, the nanopores of the nano-mineral crystals can contain a portion of the carbon dioxide gas, which is synergistic in flame retardancy.
The foam stabilizer is used for stabilizing the foam performance.
Preferably, the particle size of the nano-mineral crystal is 20-50 nm.
When the nano-mineral crystal size is less than 20nm, the foaming reaction rate is reduced, the gel reaction rate is reduced, the foaming time is longer, and the molding height is reduced; when the size of the nano-mineral crystal is larger than 50nm, the gel curing rate of the cell wall is far smaller than the expansion speed of the cell, and a large-area collapse phenomenon may occur, which is not favorable for the stability of the cell morphology.
More preferably, the nano-mineral crystals have the same size and the particle size is 30nm, so that the uniformity and smoothness of the cells can be further ensured.
Preferably, the weight ratio of the first cross-linking agent, the second cross-linking agent and the nano-mineral crystal is 1: (2-5): (10-20).
Preferably, the weight ratio of the second crosslinking agent to the foaming agent water is 1: (2-5).
Experiments prove that the viscosity of the gas and the melt of the foaming melt amount can reach a better balance value by adding the second cross-linking agent and controlling the ratio of the second cross-linking agent to the first cross-linking agent to the nano-mineral crystal to the water, so that the gas which is uniformly distributed and smaller can be formed, and the material has better tensile property.
Preferably, the polyurethane foam composition further comprises one or any combination of the following materials: flame retardant, pigment and anti-aging agent.
Preferably, the flame retardant is tris (1-chloro-ethylpropyl) phosphate (TCPP).
By adding the flame retardant TCPP, the polyurethane material has excellent flame retardant property, and the harmfulness generated in article combustion is avoided.
Preferably, the pigment is a black pigment.
Preferably, the anti-aging agent comprises an ultraviolet absorber and a hindered amine light stable antioxidant.
In the present invention, the ultraviolet absorbent is UV-312, and the antioxidant is sebacic acid (1,2,2,6, 6-pentamethyl-4-piperidinol methyl ester).
The invention has the following beneficial effects:
water is used as a foaming agent to participate in the reaction to release a large amount of heat, a certain amount of DCP (DCP) is added, so that the blending foaming material is crosslinked in a molten state, the viscosity of a melt is increased, and gas can be wrapped. However, since the melt viscosity is increased, there is a problem of poor fluidity, and a bubble breakage phenomenon may be caused to degrade the tensile properties of the system, the tensile properties of the system are improved by adding a proper amount of polydimethylsiloxane to the reaction system. In addition, polydimethylsiloxane is capable of synergistic flame retardancy.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention relates to a novel polyurethane foam composition, which comprises a component A and a component B, wherein the component A is isocyanate and is 100 parts by weight, the component B is a white material, and the components and the parts by weight are as follows: 75-110 parts of a polyol composition; 5-25 parts of polydimethylsiloxane; 1-2 parts of a first crosslinking agent dipropylene glycol (DPG); 2-5 parts of a second crosslinking agent dicumyl peroxide (DCP); 10-21 parts of nano mineral crystal; 0.3-1 part of catalyst stannous octoate (T9); 5-15 parts of foaming agent water; 1-4 parts of foam stabilizer silicone oil (CGY-3). Firstly weighing each component in a white material according to a formula, uniformly mixing the components by stirring, controlling the stirring speed at 800-1200 r/min, adding the uniformly stirred white material into a pre-preheated mold, wherein the surface temperature of the mold is 40-45 ℃, and then adding isocyanate into the white material by a high-pressure gun.
Wherein the content of the first and second substances,
the isocyanate comprises 80-90 wt% of diphenylmethane diisocyanate and 10-20 wt% of toluene diisocyanate.
The polyol composition comprises: 60-75 wt% of polyether polyol with hydroxyl value of 150-300 and functionality of 3-8; 25-40 wt% of polyester polyol with a hydroxyl value of 20-500 and a functionality of 2-3.
The grain size of the nano-mineral crystal is 20-50 nm.
The weight ratio of the first cross-linking agent to the second cross-linking agent to the nano-mineral crystal is 1: (2-5): (10-20).
The weight ratio of the second cross-linking agent to the foaming agent water is 1: (2-5).
According to the invention, by controlling the composition of the isocyanate and the polyol composition and the addition amount of the isocyanate, the polyol composition, the first crosslinking agent, the second crosslinking agent, the foaming agent water, the nano-mineral crystals and the like, the gel rate and the foaming rate reach a balance value, and the foam has stable size and good smoothness.
The extension performance of the polyurethane foam can be improved by adding the polydimethylsiloxane, and meanwhile, the alkene is synergistically blocked.
The nano mineral crystal has the effects of three aspects, the first aspect is that the carbon dioxide gas generated by isocyanate and water is divided into nano bubbles, so that the cells are more uniform; the second aspect is that the nano pores of the nano mineral crystals can delay the release speed of gas, thereby reducing the foaming rate; in a third aspect, the nanopores of the nano-mineral crystals can contain a portion of the carbon dioxide gas, which is synergistic in flame retardancy.
Furthermore, the grain size of the nano-mineral crystal is 20-50 nm. When the nano-mineral crystal size is less than 20nm, the foaming reaction rate is reduced, the gel reaction rate is reduced, the foaming time is longer, and the molding height is reduced; when the size of the nano-mineral crystals is larger than 50nm, the gel curing speed of the pore wall of the bubble is far smaller than the expansion speed of the bubble, the phenomenon of large-area bubble collapse is easily caused, and the stability of the bubble form is not facilitated.
Further, the nano-mineral crystals have the same size and the particle size of 30nm, so that the uniformity and smoothness of the cells can be further ensured.
The foam stabilizer is used for stabilizing the foam performance.
In addition, the polyurethane foam composition further comprises one or any combination of the following materials: flame retardant, pigment and anti-aging agent.
Specifically, the flame retardant is tris (1-chloro-ethylpropyl) phosphate (TCPP) 4-6 parts by weight, the pigment is a black pigment 2-6 parts by weight, the ultraviolet absorber is an ultraviolet absorber UV-312 2.5-4.5 parts by weight, and the antioxidant is sebacic acid (1,2,2,6, 6-pentamethyl-4-piperidinol methyl ester) 1.5-3.4 parts by weight. By adding the functional auxiliary agent, the polyurethane product has excellent flame retardant property and longer service life.
The functional reagent is directly added into the component B and is evenly mixed, and then the isocyanate is added.
Formula composition of polyurethane foam composition of comparative examples 1-5 and examples 1-7
Comparative example 1
The polyurethane foam composition of comparative example 1 comprises the following components in parts by weight:
80 parts of diphenylmethane diisocyanate; 20 parts of toluene diisocyanate; 45 parts of polyether polyol with the hydroxyl value of 150-300 and the functionality of 3-8; 30 parts of polyester polyol with the hydroxyl value of 20-500 and the functionality of 2-3; 5 parts of polydimethylsiloxane; 1 parts of a first crosslinking agent DPG; 5 parts of second crosslinking agent DCP; catalyst T91 parts; 10 parts of foaming agent water; and (3) CGY-31 parts of foam stabilizer silicone oil.
Comparative example 2
The polyurethane foam composition of comparative example 2 comprises the following components in parts by weight:
85 parts of diphenylmethane diisocyanate; 15 parts of toluene diisocyanate; 50 parts of polyether polyol with the hydroxyl value of 150-300 and the functionality of 3-8; 30 parts of polyester polyol with the hydroxyl value of 20-500 and the functionality of 2-3; 8 parts of polydimethylsiloxane; 6.0 parts of a crosslinking agent DPG; 12 parts of nano mineral crystals with the particle size of 30 nm; 90.7 parts of catalyst T; 12 parts of foaming agent water; and (3) CGY-32 parts of silicone oil of a foam stabilizer.
Comparative example 3
The polyurethane foam composition of comparative example 3 comprises the following components in parts by weight:
100 parts of diphenylmethane diisocyanate; 80 parts of polyether polyol with the hydroxyl value of 150-300 and the functionality of 3-8; 1.8 parts of a first crosslinking agent DPG; 4.0 parts of second crosslinking agent DCP; 19 parts of nano mineral crystals with the particle size of 20-50 nm; 90.9 parts of catalyst T; 12 parts of foaming agent water; CGY-33 parts of silicone oil as a foam stabilizer; 4 parts of flame retardant TCPP; 2 parts of pigment; UV-3122.5 parts of an ultraviolet absorbent; 1.5 parts of antioxidant.
Comparative example 4
The polyurethane foam composition of comparative example 4 comprises the following components in parts by weight:
80 parts of diphenylmethane diisocyanate; 20 parts of toluene diisocyanate; 45 parts of polyether polyol with the hydroxyl value of 150-300 and the functionality of 3-8; 30 parts of polyester polyol with the hydroxyl value of 20-500 and the functionality of 2-3; 5 parts of polydimethylsiloxane; 1 part of a first crosslinking agent DPG; 5 parts of second crosslinking agent DCP; 30 parts of nano mineral crystals with the particle size of 10-15 nm; catalyst T91 parts; 20 parts of foaming agent water; and (3) CGY-31 parts of foam stabilizer silicone oil.
Comparative example 5
The polyurethane foam composition of comparative example 5 comprises the following components in parts by weight:
85 parts of diphenylmethane diisocyanate; 15 parts of toluene diisocyanate; 50 parts of polyether polyol with the hydroxyl value of 150-300 and the functionality of 3-8; 30 parts of polyester polyol with the hydroxyl value of 20-500 and the functionality of 2-3; 8 parts of polydimethylsiloxane; 1.5 parts of a first crosslinking agent DPG; 1.5 parts of second crosslinking agent DCP; 12 parts of nano mineral crystals with the particle size of 20-50 nm; 90.7 parts of catalyst T; 12 parts of foaming agent water; CGY-32 parts of silicone oil as a foam stabilizer; 4 parts of flame retardant TCPP; 2 parts of pigment; UV-3122.5 parts of an ultraviolet absorbent; 1.5 parts of antioxidant.
Example 1
The polyurethane foam composition in the embodiment comprises the following components in parts by weight:
80 parts of diphenylmethane diisocyanate; 20 parts of toluene diisocyanate; 45 parts of polyether polyol with the hydroxyl value of 150-300 and the functionality of 3-8; 30 parts of polyester polyol with the hydroxyl value of 20-500 and the functionality of 2-3; 5 parts of polydimethylsiloxane; 1 parts of a first crosslinking agent DPG; 5 parts of second crosslinking agent DCP; 10 parts of nano mineral crystals with the particle size of 20-50 nm; catalyst T91 parts; 10 parts of foaming agent water; and (3) CGY-31 parts of foam stabilizer silicone oil.
Example 2
The polyurethane foam composition in the embodiment comprises the following components in parts by weight:
85 parts of diphenylmethane diisocyanate; 15 parts of toluene diisocyanate; 50 parts of polyether polyol with the hydroxyl value of 150-300 and the functionality of 3-8; 30 parts of polyester polyol with the hydroxyl value of 20-500 and the functionality of 2-3; 8 parts of polydimethylsiloxane; 1.5 parts of a first crosslinking agent DPG; 4.5 parts of second crosslinking agent DCP; 12 parts of nano mineral crystals with the particle size of 20-50 nm; 90.7 parts of catalyst T; 12 parts of foaming agent water; and (3) CGY-32 parts of silicone oil of a foam stabilizer.
Example 3
The polyurethane foam composition in the embodiment comprises the following components in parts by weight:
90 parts of diphenylmethane diisocyanate; 10 parts of toluene diisocyanate; 60 parts of polyether polyol with the hydroxyl value of 150-300 and the functionality of 3-8; 20 parts of polyester polyol with the hydroxyl value of 20-500 and the functionality of 2-3; 12 parts of polydimethylsiloxane; 1.8 parts of a first crosslinking agent DPG; 4.0 parts of second crosslinking agent DCP; 19 parts of nano mineral crystals with the particle size of 20-50 nm; 90.9 parts of catalyst T; 12 parts of foaming agent water; CGY-33 parts of silicone oil as a foam stabilizer; 4 parts of flame retardant TCPP; 2 parts of pigment; UV-3122.5 parts of an ultraviolet absorbent; 1.5 parts of antioxidant.
Example 4
The polyurethane foam composition in the embodiment comprises the following components in parts by weight:
83 parts of diphenylmethane diisocyanate; 17 parts of toluene diisocyanate; 58 parts of polyether polyol with the hydroxyl value of 150-300 and the functionality of 3-8; 27 parts of polyester polyol with the hydroxyl value of 20-500 and the functionality of 2-3; 15 parts of polydimethylsiloxane; 2 parts of a first crosslinking agent DPG; 5 parts of second crosslinking agent DCP; 21 parts of nano mineral crystals with the particle size of 20-50 nm; 91.2 parts of a catalyst T; 15 parts of foaming agent water; CGY-34 parts of silicone oil as a foam stabilizer; 5 parts of flame retardant TCPP; 4 parts of pigment; UV-3123.0 parts of an ultraviolet absorbent; and 3.2 parts of an antioxidant.
Example 5
The polyurethane foam composition in the embodiment comprises the following components in parts by weight:
88 parts of diphenylmethane diisocyanate; 12 parts of toluene diisocyanate; 55 parts of polyether polyol with the hydroxyl value of 150-300 and the functionality of 3-8; 35 parts of polyester polyol with the hydroxyl value of 20-500 and the functionality of 2-3; 20 parts of polydimethylsiloxane; 1.4 parts of a first crosslinking agent DPG; 4.0 parts of second crosslinking agent DCP; 18 parts of nano mineral crystals with the particle size of 20-50 nm; catalyst T91 parts; 12 parts of foaming agent water; CGY-34 parts of silicone oil as a foam stabilizer; 4 parts of flame retardant TCPP; 6 parts of a pigment; UV-3122.5 parts of an ultraviolet absorbent; and 3.4 parts of an antioxidant.
Example 6
The polyurethane foam composition in the embodiment comprises the following components in parts by weight:
90 parts of diphenylmethane diisocyanate; 10 parts of toluene diisocyanate; 70 parts of polyether polyol with the hydroxyl value of 150-300 and the functionality of 3-8; 30 parts of polyester polyol with the hydroxyl value of 20-500 and the functionality of 2-3; 25 parts of polydimethylsiloxane; 1 part of a first crosslinking agent DPG; 3 parts of second crosslinking agent DCP; 15 parts of nano mineral crystals with the particle size of 30 nm; 90.8 parts of a catalyst T; 12 parts of foaming agent water; 33.5 parts of foam stabilizer silicone oil CGY; 5 parts of flame retardant TCPP; 3 parts of a pigment; UV-3123.5 parts of an ultraviolet absorbent; and 2.5 parts of an antioxidant.
Example 7
The polyurethane foam composition in the embodiment comprises the following components in parts by weight:
80 parts of diphenylmethane diisocyanate; 20 parts of toluene diisocyanate; 70 parts of polyether polyol with the hydroxyl value of 150-300 and the functionality of 3-8; 30 parts of polyester polyol with the hydroxyl value of 20-500 and the functionality of 2-3; 20 parts of polydimethylsiloxane; 1.5 parts of a first crosslinking agent DPG; 5 parts of second crosslinking agent DCP; 20 parts of nano mineral crystals with the particle size of 30 nm; 90.6 parts of catalyst T; 15 parts of foaming agent water; CGY-34 parts of silicone oil as a foam stabilizer; 6 parts of flame retardant TCPP; 4 parts of pigment; UV-3123.0 parts of an ultraviolet absorbent; and 2.0 parts of antioxidant.
The preparation methods of the polyurethane foam compositions prepared in comparative examples 1 to 5 and examples 1 to 7 were all as follows:
firstly weighing each component in a white material according to a formula, uniformly mixing the components by stirring, controlling the stirring speed at 800-1200 r/min, adding the uniformly stirred white material into a pre-preheated mold, wherein the surface temperature of the mold is 40-45 ℃, and then adding isocyanate into the white material by a high-pressure gun.
The foamed polyurethane foam composition was processed into a 0.1mm polyurethane film, and then subjected to a performance test.
Second, performance test
The tensile property test method comprises the following steps: the obtained polyurethane film was cut into about 80 mm. times.15 mm. times.0.1 mm by a dumbbell cutter, followed by measuring the tensile strength at a tensile speed of 200mm/min at a test temperature by an Instron universal tester.
The method for testing the tensile resilience of the ultrathin product comprises the following steps: the initial length of the strip specimen was L1 before the ultra thin product tensile spring back test was performed, then pressure was applied to slowly longitudinally stretch the specimen continuously to 3 times its unstretched length over 15 minutes, then the stress was immediately removed and the length of the specimen measured after 30 minutes was L2. The permanent set of the sample was equal to (L2-L1)/L1.
Table 1 shows the results of performance tests on polyurethane films prepared from 7 polyurethane foam compositions of the present invention and comparative example 5 example polyurethane foam compositions.
TABLE 1 Performance test results for comparative examples 1 to 5 and examples 1 to 7
| Group of | Tensile Strength MPA | Elongation at break | Rate of permanent set |
| Comparative example 1 | 5.4 | 152％ | - |
| Comparative example 2 | 6.2 | 175％ | - |
| Comparative example 3 | 5.8 | 158％ | - |
| Comparative example 4 | 8.4 | 318％ | 56％ |
| Comparative example 5 | 9.3 | 358％ | 34％ |
| Example 1 | 13.8 | 539％ | Less than 2 percent |
| Example 2 | 12.9 | 522％ | Less than 2 percent |
| Example 3 | 14.3 | 583％ | Less than 2 percent |
| Example 4 | 14.8 | 536％ | Less than 2 percent |
| Example 5 | 13.1 | 496％ | Less than 2 percent |
| Example 6 | 15.2 | 598％ | Less than 2 percent |
| Example 7 | 15.4 | 562％ | Less than 2 percent |
The experimental results in table 1 show that the polyurethane film (with a thickness of 0.1mm) prepared by the formula of the present invention has the advantages of high tensile strength, high elongation at break, low permanent deformation rate, low possibility of deformation and fracture, suitability for use in electronic products, and capability of prolonging the service life of the electronic products.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A novel polyurethane foam composition is characterized by comprising a component A and a component B, wherein the component A is isocyanate and the weight part of the component A is 100 parts; the component B is a white material and comprises the following components in parts by weight:
75-110 parts of a polyol composition;
5-25 parts of polydimethylsiloxane;
1-2 parts of a first cross-linking agent, namely dipropylene glycol (DPG);
2-5 parts of a second crosslinking agent dicumyl peroxide (DCP);
10-21 parts of nano mineral crystal;
0.3-1 part of catalyst stannous octoate;
5-15 parts of foaming agent water;
1-4 parts of foam stabilizer silicone oil.
2. The novel polyurethane foam composition as claimed in claim 1, wherein the isocyanate comprises 80 to 90 wt% of diphenylmethane diisocyanate and 10 to 20 wt% of toluene diisocyanate.
3. The novel polyurethane foam composition as claimed in claim 1, wherein the polyol composition comprises a polyether polyol having a hydroxyl value of 150 to 300 and a functionality of 3 to 8 and a polyester polyol having a hydroxyl value of 20 to 500 and a functionality of 2 to 3, wherein the weight percentage of the polyether polyol is 60 to 75%, and the weight percentage of the polyester polyol is 25 to 40%.
4. The novel polyurethane foam composition according to claim 1, wherein the nano-mineral crystal has a particle size of 20 to 50 nm.
5. The novel polyurethane foam composition as claimed in claim 4, wherein the weight ratio of the first cross-linking agent, the second cross-linking agent and the nano-mineral crystal is 1: (2-5): (10-15).
6. The novel polyurethane foam composition as claimed in claim 5, wherein the weight ratio of the second crosslinking agent to the blowing agent water is 1: (2-5).
7. The novel polyurethane foam composition according to any one of claims 1 to 6, wherein the polyurethane foam composition further comprises one or any combination of the following materials: flame retardant, pigment and anti-aging agent.
8. The novel polyurethane foam composition according to claim 7, wherein the flame retardant is tris (1-chloro-ethylpropyl) phosphate TCPP.
9. The novel polyurethane foam composition according to claim 7, wherein the pigment is a black pigment.
10. The novel polyurethane foam composition of claim 7 wherein the aging resistor comprises a UV absorber and a hindered amine light stable antioxidant.
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