Composition for polyurethane foaming, polyurethane foam and use thereof
A composition for polyurethane foaming, a polyurethane foam and a use thereof. The composition contains two different polyols with a polyethylene oxide ether structure and a polypropylene oxide ether structure, and a specific type of catalyst, flame retardant and water are added thereto; at the same time, the composition contains a small amount of a surfactant and other small molecular alcohols. The traits of the product are that it is pale yellow and transparent, and the product is not layered during long-term storage. The above-mentioned composition and polyphenylpolymethylene polyisocyanate (PAPI) produce a low-density polyurethane foam by means of a foaming machine. The foam has a good thermal insulation effect and a high rate of yield, and the foam has a flame retardant property, that is to say, same can be used for construction insulation, and can also be used for packaging a buffer material, has a good thermal insulation, adhesion and dimensional stability, and has a low odor during the process of construction, the foaming agents all use water, and do not contain chlorofluorocarbon substances that destroy the ozone layer and climate.
1. A composition for a polyurethane foam, wherein based on 100 parts by weight of the composition, the composition comprises the following materials in parts by weight:
10-30 parts of a polyether polyol A;
20-40 parts of a polyether polyol B;
10-40 parts of a flame retardant;
10-30 parts of water;
1-4 parts of a surfactant; and;
1-8 parts of a catalyst;
wherein, the average functionality of polyether polyol A is 4-8, and the hydroxyl value of polyether polyol A is 300-700 mgKOH/g;
wherein, the average functionality of polyether polyol B is 2-4, and the hydroxyl value of polyether polyol B is 20-200 mgKOH/g;
wherein, the flame retardant is a phosphate or a mixture of phosphates, and the phosphorus content of the flame retardant is 8-40 wt %;
wherein, the catalyst is a mixture of hydroxyl group-containing organic tertiary amines; and;
wherein the polyether polyol B is produced by the polymerization of propylene oxide, ethylene oxide and an initiator, the initiator is a mixture of glycerol and a component selected from the group consisting of dipropylene glycol, diethylene glycol, triethanolamine and combinations thereof, wherein the polyether polyol B comprises a terminal block based on ethylene oxide.
2. The composition according to claim 1 , wherein the polyether polyol A is produced by the polymerization of propylene oxide, ethylene oxide and an initiator, the initiator for polyether polyol A is a mixture of tris(hydroxymethyl)propane and a component selected from the group consisting of sorbitol, sucrose, pentaerythritol, 2,4-diamino-phenol, ethylenediamine and combinations thereof; wherein the propylene oxide and the ethylene oxide for polyether polyol A are provided at a molar ratio of 7:3-9:1.
3. The composition according to claim 1 , wherein the polyether polyol A is produced by the polymerization of propylene oxide, ethylene oxide and an initiator, the initiator for polyether polyol A is a mixture of sucrose, tris(hydroxymethyl)propane, and sorbitol; the average functionality of polyether polyol A is 4-5; the hydroxyl value of polyether polyol A is 400-500 mgKOH/g; the propylene oxide and the ethylene oxide for polyether polyol A are provided at a molar ratio of 7:3-8:2.
4. The composition according to claim 1 , wherein the polyether polyol A is produced by the polymerization of propylene oxide, ethylene oxide and an initiator, the initiator for polyether polyol A is selected from the group consisting of 2,4-diamino-phenol, ethylenediamine, and combinations thereof; the average functionality of polyether polyol A is 4-5; the hydroxyl value of polyether polyol A is 500-700 mgKOH/g; the propylene oxide and the ethylene oxide for polyether polyol A are provided at a molar ratio of 7:3-9:1.
5. The composition according to claim 1 , wherein the initiator for polyether polyol B is a mixture of triethanolamine and glycerol, and wherein the hydroxyl value of polyether polyol B is 20-90 mgKOH/g.
6. The composition according to claim 1 , wherein the surfactant is formed by block copolymerization of polymethyl siloxane, propylene oxide and ethylene oxide.
7. The composition according to claim 1 , wherein the catalyst comprises a mixture of dimethylamino ethoxyethanol and trimethylethoxyethylenediamine, and further comprises one or more of N, N, N′-trimethyl-N′-hydroxyethyl diamino ethyl ether, trimethyl hydroxyethyl propanediamine, and dimethylethanolamine.
8. The composition according to claim 1 , wherein the flame retardant is a mixture of triethyl phosphate and a component selected from the group consisting tris(2-chloropropyl) phosphate, tris(2-chloroethyl) phosphate and combinations thereof, wherein triethyl phosphate represents at least 40% of the total parts by weight of the flame retardant.
9. The composition according to claim 1 , wherein the composition further comprises 0-3 wt % of other additives, and the other additives are selected from triethanolamine, glycerol, and combinations thereof.
10. A polyurethane foam, which is obtained from the composition according to claim 1 .
11. The polyurethane foam according to claim 10 , which is obtained by the reaction of the composition with polyphenylpolymethylene polyisocyanate (PAPI).
12. A thermal insulation filling material, thermal insulation material, sound insulation material, damp proofing material for buildings, or packaging material for precise instrument comprising the polyurethane foam of claim 10 .
13. The composition according to claim 1 comprising the following materials in parts by weight:
15-25 parts of polyether polyol A;
25-35 parts of polyether polyol B;
20-30 parts of flame retardant;
13-18 parts of water;
2-3 parts of surfactant; and
3-6 parts of catalyst.
14. The composition according to claim 1 , wherein the catalyst is a composition of dimethylamino ethoxyethanol, trimethylethoxylethylenediamine and optionally N,N,N′-trimethyl-N′-hydroxyethyl diamino ethyl ether in a mass ratio of 1-3:1-3:0-3.
15. The composition according to claim 1 , wherein the flame retardant is the mixture of triethyl phosphate and tris(2-chloropropyl) phosphate in a mass ratio of 1-3:1-3.