Production method for rigid polyurethane foam from environment-friendly foaming agent and product thereof
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A technology of rigid foam and blowing agent, which is applied in the field of polyurethane rigid foam preparation in the building materials insulation industry, which can solve the problems of catalyst usage restrictions and achieve the effects of overcoming unstable storage, good foam appearance and low density
Inactive Publication Date: 2013-11-06
SHANGHAI HUAFENG MATERIAL TECH RES INST LLP +2
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[0010] The first object of the present invention is to provide a kind of on-site direct mixing and foaming technology (which can be continuous method or batch method) to prepare the preparation method of polyurethane rigid foam insulation material, to overcome the storage problem of HFE-254pc premix, and the present Some HFE-254pc premixes have technical problems that limit the use of catalysts
[0011] The second object of the present invention is to provide a polyurethane rigid foam prepared by using the above method to overcome the storage problem of the HFE-254pc premix, and the existing HFE-254pc premix limits the use of the catalyst technical issues
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Embodiment 1
[0039] The present embodiment adopts batch process to prepare polyurethane rigid foam material:
[0040] Add 96 grams of HFE-254pc and 4 grams of HFC-227ea into the container, quickly seal it, and mix evenly to prepare a mixed foaming agent, which is kept refrigerated for use;
[0041] Mix 100 parts by weight of polyether polyol ZS-4110, 2 parts by weight of foam stabilizer L-6860, 1 part by weight of deionized water, and 0.5 parts by weight of catalyst Dabco EG, and stir evenly to prepare the combination A material. In industrial production, combination A material can also be stored for a long time;
[0042] The above two steps are in no particular order. Mix 103.5 grams of combination A material with 20 grams of mixed foaming agent, stir well, add 130 grams of isocyanate PM-200 to the mixture, take mechanical stirring and mixing in a low pressure foaming machine, and mix and stir at 1500rpm at 25°C 5 seconds. Then the mixture is poured into a transparent cup and molded, t...
Embodiment 2
[0051] The present embodiment adopts continuous process to prepare polyurethane rigid foam material:
[0052] Add 96 grams of HFE-254pc and 4 grams of HFC-227ea into the container, quickly seal it, and mix evenly to prepare a mixed foaming agent, which is kept refrigerated for use;
[0053] Fill polyols Desmophen 3607, L-6860, flame retardant TCPP, glycerin, catalyst DBTDL, isocyanate MDI, and mixed blowing agent (HFE-254pc / HFC-227ea) into their respective storage tanks. Adjust the outlet flow control of each storage tank respectively as shown in Table 2, and the flow of each raw material is controlled by a flow meter.
[0054] 【Table 2】
[0055]
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Abstract
The invention discloses a production method for rigid polyurethane foam from an environment-friendly foaming agent. Reaction raw materials comprise polyisocyanate, polyol and a foaming agent; the foaming agent is 1,1,2,2-tetrafluoroethyl methyl ether which is separately stored and is mixed with other reaction components only just before a reaction in a manner of on-site direct mixing and foaming. The invention also provides a rigid polyurethane foam material. According to the invention, 1,1,2,2-tetrafluoroethyl methyl ether is used as the foaming agent and on-site direct mixing and foaming technology (wherein the foaming agent is separately stored and is mixed with the other reaction components only just before the reaction) is adopted so as to prepare the rigid polyurethane foam insulation material; compared with conventional process and methods, the method provided by the invention can overcome the problem of instability of a premix during storage and poses no restriction on usage of a catalyst. The rigid polyurethane foam material prepared by using the method has excellent performance.
Description
technical field [0001] The invention belongs to the technical field of rigid polyurethane foam materials, and in particular relates to a method for preparing rigid polyurethane foam in the building material insulation industry containing 1,1,2,2-tetrafluoroethyl methyl ether (HFE-254pc) as a foaming agent and products obtained by this method. Background technique [0002] Polyurethane foam is a foam material formed by addition polymerization and foaming of polyols and isocyanates as raw materials under the action of catalysts and foaming agents. This material has excellent physical mechanical properties, electrical properties, acoustic properties and chemical resistance. Because of its low thermal conductivity, low density, high strength, low water absorption, heat insulation, insulation, sound insulation, good chemical stability, and high recovery rate after impact, it is widely used in petroleum, chemical, transportation, construction and other fields. [0003] At presen...
Claims
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