CN1724577A - Preparation of expandable graphite filled high dendensity hard polyurethane foamed plastic - Google Patents
Preparation of expandable graphite filled high dendensity hard polyurethane foamed plastic Download PDFInfo
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- CN1724577A CN1724577A CN 200410040288 CN200410040288A CN1724577A CN 1724577 A CN1724577 A CN 1724577A CN 200410040288 CN200410040288 CN 200410040288 CN 200410040288 A CN200410040288 A CN 200410040288A CN 1724577 A CN1724577 A CN 1724577A
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Abstract
The invention discloses a method and device to make expandable graphite filling high density hard polyurethane foam plastic. It mixes polyether polyhydric alcohol, triethanolmine, organo-tin, silicone oil, water and expandable graphite at a certain proportion. After whisking by mechanism whisking device to equal, a certain quantity of iso-cyanic ester is added and mixed fully, then pouring into mould, covering the mould cover and taking curing process to gain the production. The invention has good fire resistance property, and the oxygen index would reach 40, the material of vertical burning testing reaches FV-0 grade. The invention conquers the disadvantage of halogenated fire resistance agent, and has crucial meaning for circumstance.
Description
One, technical field
The invention belongs to the novel high polymer material technical field, is a kind of method of utilizing expansible black lead (EG) filling high density degree rigid urethane foam to produce fire-retardant packing and structural foam.
Two, background technology
Rigid urethane foam (RPUF) is to be main raw material with multi-hydroxy compound and isocyanic ester, under effects such as catalyzer, whipping agent, and the foam materials that forms through addition polymerization, foaming.Rigid urethane foam has excellent physical and mechanical properties, electric property, acoustical behavior and resistance to chemical corrosion.Its thermal conductivity is low, density is little, intensity is high, water-absorbent is little, adiabatic, insulation, soundproof effect is good, chemical stability is good, the back response rate height that is hit, thereby is widely used in the every field of national economy such as oil, chemical industry, transportation, building, daily life.But the rigid urethane foam without fire-retardant finish is a kind of combustible material, and density is 0.25g/cm
3About porous plastics, its oxygen index only is about 18, and is close with cotton, run into burning things which may cause a fire disaster or high bake all easy fire burns, cause fire.Domestic the report a lot ofly caused the fire cases of tremendous economic loss because of urethane foam catches fire.Therefore, it is significant to adopt the whole bag of tricks to improve the rigid urethane foam flame retardant properties.
At present, the flame resistant method of domestic and international general rigid urethane foam has two kinds: the one, add the fire retardant of elements such as chloride, bromine, phosphorus, and this additive flame retardant effect is not ideal, and oxygen index can only reach 25～28, be difficult to surpass 30, and the flame retardant properties persistence is poor; The 2nd, urethane is carried out structurally-modified, promptly in polyethers (polyester) polyvalent alcohol, introduce group with fire retardation, as phosphorus, halogen etc., improved the Flame Retardancy of Polyurethane Foam performance to a certain extent, but oxygen index also only is about 30.Because fire-retardant group has participated in chemical reaction, ignition-proof element is introduced on the molecular skeleton of polymkeric substance, thereby makes the foam fire retardation lasting.
Some investigators (Tian Chunrong, etc. plastics science and technology, 2003,1:24; Prociak, Deng .Polymers, 2001,46 (10): 692) adopt halogenated phosphoric acid salt as the fire retardant of urethane foam and the synergy between the fire retardant, improved soft and flame retardant properties rigid urethane foam, the oxygen index of urethane foam is brought up to about 26 from 18.Though raw materials such as halophosphate based flame retardant and polyvalent alcohol have good compatibility, during the foam burning, fire retardant decomposes, and produces a large amount of smog and corrosion irritant gas.Therefore, the application of halogen-containing fire retardant is subjected to very big restriction, even bans use of in some countries and regions, and halogen-free flame retardants more and more receives publicity.Lu mould virtuous grade (Lu moulds virtuous, etc. modern plastics processed and applied, 1993. (3): 4; Sivriev C.European Polymer, 1992,28 (1): 9) adopt poly-isocyanurate modification, introducing halogen group to wait the flame retardant properties of improving rigid urethane foam, its oxygen index has been reached about 29, fire-retardant persistence is good.
In recent years, expansion type flame retardant is developed rapidly.(Vandersall such as Vandersall, Deng .Journalof Fire and Flammability.1971,2:97) advantage and the mechanism of expansion type flame retardant have been summed up, think and run into when hot when expansion type flame retardant, produce volumetric expansion, starvation and combustionmaterial have avoided the transmission of heat and combustionmaterial further to degrade.
Expansible black lead is important a kind of in the expansion type flame retardant.Patent documentation is arranged, and (Goto M waits .Europeanpatent EP 0 824 134 A1,1997; William R, etc., US patent 2 168 706 A, 1986) reported that expansible black lead can well improve soft and elastomeric polyurethane foam flame retardant of plastic performance.(Duquesne S such as Duquesne, Deng .Fire and Materials.2003,27:103) studied expansible black lead and joined fire retardant mechanism in the foamed polyurethane coating, thought that expansible black lead charcoal layer expansible physical property is the major reason that causes the excellent flame-retardant performance of expansible black lead in urethane.They are (Duquesne S, Deng .Polymer Degradation and Stability.2001,74 (3): 493-499) also studied the thermostability of expansible black lead/foamed polyurethane coating system, found to add the thermostability of improving polyurethane system that expansible black lead can be slight.
(Hu Xingsheng such as Hu Shisheng, Deng. plastics industry .2004,33 (1): 45) compared expansible black lead and ammonium polyphosphate (APP), triethyl phosphate (TEP), trimeric cyanamide (MA), melamine cyanurate halogen-free flame retardantss such as (MC) flame retardant properties, studied the synergy of expansible black lead and these several halogen-free flame retardantss simultaneously with oxygen index method at rigid urethane foam.Result of study shows: when the content of expansible black lead is 25%, the oxygen index of rigid urethane foam reaches 30, the effect of expansible black lead flame retarded rigid polyurethane foams plastics is best in halogen-free flame retardants commonly used, and its flame retardant effect and its granularity are directly proportional, expansible black lead and APP, TEP, MA, all there is good synergism between the MC, wherein expansible black lead and APP, the synergistic action effect of TEP is best, occur peak value 29 and 27 respectively at APP/EG=1/1 and TEP/EG=1015/715 left and right sides oxygen index, the independent fire-retardant maximum value that oxygen index compares has increased by 7.4% and 10.0% respectively.
(Modesti M waits .Polymer Degradation and Stability.2002,78 (2): 341 to Modesti etc.; Lorenzetti A, wait .Polymer Degradation and Stability.2002,77 (2): (density is 0.35g/cm 195) to have studied the rigid urethane foam that expansible black lead fills
3About) and the synergy in rigid urethane foam of expansible black lead and APP, TEP, MA, MC.Discover: the oxygen index of the high more rigid urethane foam of the content of graphite is high more, the lost speed of heat is low more, the oxygen index that adds the rigid urethane foam of 25wt% expansible black lead is 26, when expansible black lead and TEP synergy, the rigid urethane foam flame retardant properties has obtained further improvement, and the mechanical property that adds the expansible black lead system has only slight decline, has reached the standard of industrial application.
Although Chinese scholars has been done some research work to the fire-retardant research of urethane foam, but be applied in fire retardant commonplace in the rigid urethane foam at present is the phosphoric acid ester that contains halogen, because the burning of the fire retardant of this class produces a large amount of smog and corrosion irritant gas, human body, equipment and environment there are very big harm, are about to be eliminated.And the phosphoric acid ester fire retardant of Halogen can not make rigid urethane foam reach the good flame effect.Both at home and abroad to the Study of Flame Retardant of expansible black lead, only limit to also that some are low-density as rigid urethane foam.At rigid urethane foam, particularly (density is greater than 0.4g/cm for the high-density hard ester polyurethane foam
3), Study on flame retardance is not appeared in the newspapers as yet.The present invention adopts the closed mold foaming, and this method can be well by the different mass of control reaction raw materials, and making density is 0.40～0.60g/cm
3Porous plastics.Based on these problems, the present invention uses expansible black lead to improve the flame retardant properties of high-density hard urethane foam.This material can be used for the field of environment for use harshness, as wrapping material and structured material important meaning is arranged in many fields such as electronic component, national defence, space flight.
Three, summary of the invention
One of purpose of the present invention is the deficiency at the fire retardant Firemaster 836 class that is widely used in rigid urethane foam both at home and abroad, can produce irritating smog and corrosive gases when being the burning of halogenated fire retardant, human body, equipment and environment are produced harm.The present invention adopts novel environment friendly flame retardant---and expansible black lead is as the fire retardant of rigid urethane foam.
Two of purpose of the present invention is the deficiencies at domestic and international research, and the density of promptly studying the flame retarded rigid polyurethane foams plastics both at home and abroad is generally at 0.25-0.35g/cm
3, the density that improves rigid urethane foam is to 0.4-0.6g/cm
3, make and can be used as the highdensity flame retarded rigid polyurethane foams plastics that structured material uses.
Three of purpose of the present invention is to use the fire retardant to environment and body harmless's expanded polystyrene veneer to replace traditional halogenated fire-retardants to improve the method for rigid urethane foam flame retardant properties, be about to monomer polyethers that expansible black lead joins the preparation rigid urethane foam how far in the alcohol, utilize expansible black lead to run into thermal source and can produce the volumetric expansion of 150-300 about doubly, covered the surface of high-temp combustion thing, polyurethane matrix and extraneous oxygen have been completely cut off, effect with flame-retardant smoke inhibition makes rigid urethane foam have good flame retardancy.The oxygen index that research both at home and abroad adds expansible black lead has preferably only reached 30, and present method is brought up to its oxygen index about 40, compares with pure sample and has improved nearly one times.
The rigid urethane foam of body material of the present invention under catalyzer and whipping agent effect, making by polyether glycol and isocyanic ester.The significant parameter of various raw materials is as shown in table 1:
Raw material that table 1 the present invention is used and performance perameter thereof
| Material name | Specifeca tion speeification |
| Polyether glycol | Density is about 1.1g/cm 3Hydroxyl value is 390-470mgKOH/g; Viscosity is 2000～4000cps; Functionality is about 4.1; Average molecular mass is about 550. |
| Polymethine polyphenyl polyisocyanate (isocyanic ester) PAPI | Relative molecular mass is 126.5; Isocyano-content is about 28～32%; Viscosity is 150～250cps; Functionality is about 2.2. |
| Trolamine | Crosslinking catalyst, density are 1.122g/cm 3 |
| Dibutyl tin dilaurate | Catalysts, density are 1.052g/cm 3Tin content is 18%. |
| Tap water | Whipping agent |
| Silicone oil | Suds-stabilizing agent, technical grade |
Fire retardant of the present invention is an expansible black lead, and expansion multiplying power is 150～300.
Mould therefor size of the present invention and shape are looked goods size and shape decision, and material can be used aluminium alloy.Need open spilehole in the foaming direction, guarantee that the gas in the mould is discharged smoothly when foaming, its size is advisable not produce excessive overflow.
The method of utilizing expansible black lead to fill rigid urethane foam provided by the invention, it is characterized in that quality by the control reaction raw materials, make the porous plastics of different densities, and prepare expansible black lead/rigid urethane foam of expansible black lead content 0～20wt% by following processing step and condition:
(1) weighing is by prescription weighing polyether glycol and isocyanic ester.
(2) dry polyether glycol and isocyanic ester be 80 ℃ of down dry 12 hours (temperature can fluctuate up and down, but is higher than 100 ℃ most, but the time is looked raw-material moisture content proper extension and shortening), dry postcooling to about 25 ℃ standby.
(3) mix by prescription catalyzer trolamine and organotin, and whipping agent water joins in the polyether glycol, fully stir with mechanical stirring device, mix, then expansible black lead is joined wherein after the weighing by prescription, fully stir, mix with mechanical stirring device.
(4) the polymerization foaming joins isocyanic ester rapidly in the blending ingredients, fully stirs simultaneously, is poured in the mould after 30 seconds, closes die cap.
(5) aftertreatment (slaking) is together put into baking oven with mould and polyurethane foam wherein, solidifies 4 hours down at 100 ℃, takes out postcooling.
(6) sample is taken out in the sample preparation die sinking, removes the surface skining layer, obtains the high-density hard urethane foam that expansible black lead is filled.
The amount ranges of each component is as shown in table 2 in the present invention's prescription:
The amount ranges of each component of table 2
| Form | Polyether glycol part | Isocyanic ester part | Organotin part | Trolamine part | Silicone oil part | Distillation moisture content | Expansible black lead part |
| - | 100 | 100～180 | 0.05～0.15 | 0～0.2 | 1～4 | 0.05～0.1 | 0～20 |
The present invention has following advantage:
(1) rigid polyurethane foam that makes of the present invention is to make by the closed mold foaming method, and this method can make density up to 0.40～0.60g/cm well by the different proportionings and the quality of control reaction raw materials
3Porous plastics.
(2) rigid polyurethane foam that makes of the present invention, fillers dispersed is in the middle of the polyurethane foam matrix, because running into the peculiar property that thermal source can produce volumetric expansion, expansible black lead make urethane foam system flame retardant properties than the obvious raising of conventional flame retardant, the expansible black lead loading level is the porous plastics of 20wt%, oxygen index reaches 40, has improved nearly one times than the oxygen index of pure sample.
(3) the poly-foam materials of the flame retarded rigid that makes of the present invention can use as wrapping material and structured material in the field of environment for use harshnesses such as electronic component national defence, space flight, automobile.
(4) the rigid polyurethane foam material material that makes of the present invention in combustion processes, can not produce irritating smog and corrosive gases, and human body, equipment and environment are safe from harm, and is especially significant in environment protection.
(5) rigid polyurethane foam that makes of the present invention is compared with pure rigid urethane foam, and mechanical property only slightly descends, but this mechanical strength has reached industrial application requirements.
Four, description of drawings
Fig. 1 is the electron scanning micrograph of the pure rigid urethane foam of embodiment 1 gained; Fig. 2 is the electron scanning micrograph of embodiment 4 gained expansible black lead/rigid urethane foams; Fig. 3 is the electron scanning micrograph after the pure rigid urethane foam burning of embodiment 1 gained; Fig. 4 is the electron scanning micrograph after embodiment 4 gained expansible black lead/rigid urethane foam burning; Fig. 5 is the electron scanning micrograph of the amplification after embodiment 4 gained expansible black lead/rigid urethane foam burning.
Five, embodiment
Embodiment given below is to specific descriptions of the present invention; be necessary to be pointed out that at this following examples only are used for that the present invention is described further; can not be interpreted as limiting the scope of the invention; this art skilled person makes some nonessential improvement and adjustment according to the invention described above content to the present invention, still belongs to protection scope of the present invention.
The g/cm of density 0.44～0.48
3The prescription of the embodiment 1～15 of rigid urethane foam sees Table 3
The prescription of table 3 embodiment 1～15
| Embodiment | Polyether glycol | Isocyanic ester | Expansible black lead | Organotin | Trolamine | Water | Silicone oil |
| Part | Part | Part | Part | Part | Part | Part | |
| 1 | 100 | 140 | 0 | 0.1 | 0.1 | 0.05 | 2 |
| 2 | 100 | 160 | 0 | 0.15 | 0.2 | 0.1 | 4 |
| 3 | 100 | 120 | EG300：10 | 0.1 | 0.15 | 0.05 | 4 |
| 4 | 100 | 140 | EG300：5 | 0.05 | 0.15 | 0.05 | 1 |
| 5 | 100 | 140 | EG300：10 | 0.1 | 0.2 | 0.1 | 3 |
| 6 | 100 | 140 | EG300：15 | 0.15 | 0.05 | 0.1 | 4 |
| 7 | 100 | 140 | EG300：20 | 0.05 | 0.1 | 0.05 | 4 |
| 8 | 100 | 120 | EG200：5 | 0.05 | 0.2 | 0.05 | 3 |
| 9 | 100 | 130 | EG300：15 | 0.15 | 0.2 | 0.1 | 2 |
| 10 | 100 | 140 | EG200：15 | 0.1 | 0.1 | 0.05 | 1 |
| 11 | 100 | 160 | EG200：20 | 0.05 | 0.15 | 0.1 | 4 |
| 12 | 100 | 170 | EG300：5 | 0.1 | 0.2 | 0.05 | 2 |
| 13 | 100 | 150 | EG300：5 | 0.05 | 0.05 | 0.05 | 1 |
| 14 | 100 | 130 | EG300：20 | 0.15 | 0.2 | 0.1 | 3 |
| 15 | 100 | 140 | EG200：20 | 0.1 | 0.05 | 0.1 | 4 |
Annotate: 1.EG300 is that rate of expansion is 300 expansible black lead; EG200 is that rate of expansion is 200 expansible black lead.
2. example 5 employing hydroxyl values are that 450mgKOH/g, viscosity are the polyether glycol of 3521cps.
3. example 12 adopts that isocyano-contents are about 28%, viscosity is the isocyanic ester of 172cps.
4. it is that 430mgKOH/g, viscosity are the polyether glycol of 3283cps that not marked example adopts hydroxyl value, and isocyano-content is 30%, viscosity is the isocyanic ester of 215cps.
The g/cm of density 0.52～0.56
3The prescription of the embodiment 16～26 of rigid urethane foam sees Table 4
The prescription of table 4 embodiment 16～26
| Embodiment | Polyether glycol | Isocyanic ester | Expansible black lead | Organotin | Trolamine | Water | Silicone oil |
| Part | Part | Part | Part | Part | Part | Part | |
| 16 | 100 | 120 | 0 | 0.1 | 0.2 | 0.1 | 1 |
| 17 | 100 | 120 | EG300：10 | 0.15 | 0.1 | 0.05 | 1 |
| 18 | 100 | 140 | EG300：5 | 0.15 | 0.15 | 0.05 | 4 |
| 19 | 100 | 160 | EG300：10 | 0.05 | 0.05 | 0.1 | 2 |
| 20 | 100 | 120 | EG300：5 | 0.05 | 0.05 | 0.05 | 1 |
| 21 | 100 | 170 | EG300：20 | 0.15 | 0.05 | 0.1 | 2 |
| 22 | 100 | 140 | EG200：10 | 0.05 | 0.15 | 0.1 | 3 |
| 23 | 100 | 160 | EG200：20 | 0.05 | 0.2 | 0.05 | 4 |
| 24 | 100 | 130 | EG300：15 | 0.15 | 0.2 | 0.1 | 2 |
| 25 | 100 | 140 | EG200：15 | 0.1 | 0.1 | 0.05 | 1 |
| 26 | 100 | 180 | EG300：20 | 0.15 | 0.2 | 0.1 | 4 |
Annotate: 1.EG300 is that rate of expansion is 300 expansible black lead; EG200 is that rate of expansion is 200 expansible black lead.
2. to adopt hydroxyl values be that 400mgKOH/g, viscosity are the polyether glycol of 2521cps for example 23, and isocyano-content is about 32%, viscosity is the isocyanic ester of 243cps.
3. it is 430mgKOH/g that not marked example adopts hydroxyl value; Viscosity is the polyether glycol of 3283cps, and isocyano-content is 30%; Viscosity is the isocyanic ester of 215cps.
Be the flame retardant properties of expansible black lead/rigid urethane foam of investigating the present invention's preparation, with the foam materials that makes test performance in the requsst listed below:
Oxygen index: integral foam is cut into 127 * 10 * 10mm
3Sample, test by GB/T2406-88.
Vertical combustion: with integral foam cut growth 127 * 13 * 10mm
3Sample, test by GB/T2408-1996.
Mechanical property: with integral foam cut growth Φ 50 * 5mm
3Sample, test by GB/T8813-88.
Table 5 is the flame retardant properties of expansible black lead/rigid urethane foam
| Description of materials | Oxygen index | Vertical combustion | ||
| t 1/s | t 2/s | The FV rank | ||
| Embodiment 1 | 22.5 | ＞30 | - | - |
| Embodiment 2 | 23 | ＞30 | - | - |
| Embodiment 3 | 31.5 | 2.0 | 3.7 | FV-0 (minimum thickness 10.1mm) |
| Embodiment 4 | 27 | 2.3 | 9.4 | FV-1 (minimum thickness 10.2mm) |
| Embodiment 5 | 30 | 2.2 | 2.7 | FV-0 (minimum thickness 9.9mm) |
| Embodiment 6 | 36 | 1.2 | 2.3 | FV-0 (minimum thickness 10.3mm) |
| Embodiment 7 | 38.5 | 1.3 | 1.8 | FV-0 (minimum thickness 10.0mm) |
| Embodiment 8 | 25.5 | 3.4 | 7.3 | FV-1 (minimum thickness 10.0mm) |
| Embodiment 9 | 34.5 | 1.5 | 2.7 | FV-0 (minimum thickness 9.8mm) |
| Embodiment 10 | 35 | 1.6 | 2.9 | FV-0 (minimum thickness 10.0mm) |
| Embodiment 11 | 39 | 1.2 | 1.5 | FV-0 (minimum thickness 10.0mm) |
| Embodiment 12 | 27 | 3.4 | 5.8 | FV-0 (minimum thickness 10.0mm) |
| Embodiment 13 | 25 | 3.0 | 7.3 | FV-1 (minimum thickness 10.0mm) |
| Embodiment 14 | 37 | 1.5 | 1.7 | FV-0 (minimum thickness 10.1mm) |
| Embodiment 15 | 39 | 1.3 | 1.5 | FV-0 (minimum thickness 10.0mm) |
| Embodiment 16 | 22 | ＞30 | - | - |
| Embodiment 17 | 30 | 1.9 | 3.1 | FV-0 (minimum thickness 10.2mm) |
| Embodiment 18 | 28 | 1.7 | 4.2 | FV-0 (minimum thickness 10.0mm) |
| Embodiment 19 | 32 | 1.2 | 2.3 | FV-0 (minimum thickness 10.0mm) |
| Embodiment 20 | 25.5 | 3.2 | 7.1 | FV-1 (minimum thickness 10.0mm) |
| Embodiment 21 | 38.5 | 1.2 | 2.1 | FV-0 (minimum thickness 9.9mm) |
| Embodiment 22 | 32.5 | 1.7 | 2.4 | FV-0 (minimum thickness 10.0mm) |
| Embodiment 23 | 39.5 | 1.2 | 1.3 | FV-1 (minimum thickness 10.0mm) |
| Embodiment 24 | 35.5 | 1.1 | 2.8 | FV-0 (minimum thickness 10.0mm) |
| Embodiment 25 | 36.5 | 1.8 | 2.2 | FV-0 (minimum thickness 10.3mm) |
| Embodiment 26 | 40.5 | 1.2 | 1.2 | FV-0 (minimum thickness 10.0mm) |
Table 6 is the mechanical property of expansible black lead/rigid urethane foam
| Description of materials | Compressive strength (MPa) | Modulus of compression (MPa) |
| Embodiment 1 | 14.6 | 264.3 |
| Embodiment 2 | 15.9 | 282.6 |
| Embodiment 3 | 8.2 | 190 |
| Embodiment 4 | 11.5 | 220.4 |
| Embodiment 5 | 9.2 | 200.7 |
| Embodiment 6 | 8.3 | 195.6 |
| Embodiment 7 | 8.8 | 210.8 |
| Embodiment 8 | 11.0 | 220.5 |
| Embodiment 9 | 8.5 | 205.3 |
| Embodiment 10 | 8.8 | 205.3 |
| Embodiment 11 | 8.8 | 199.8 |
| Embodiment 12 | 13.2 | 244.4 |
| Embodiment 13 | 12.4 | 233.3 |
| Embodiment 14 | 8.2 | 185.4 |
| Embodiment 15 | 8.8 | 196.7 |
| Embodiment 16 | 15.5 | 270.6 |
| Embodiment 17 | 10.2 | 230.3 |
| Embodiment 18 | 12.9 | 232.9 |
| Embodiment 19 | 10.8 | 220.2 |
| Embodiment 20 | 12.1 | 122.2 |
| Embodiment 21 | 8.8.2 | 196.2 |
| Embodiment 22 | 9.5 | 205.8 |
| Embodiment 23 | 8.9 | 197.5 |
| Embodiment 24 | 8.5 | 198.6 |
| Embodiment 25 | 8.8 | 202.6 |
| Embodiment 26 | 9.8 | 210.4 |
Claims (8)
1. the method for utilizing expansible black lead to prepare fire-retardant high-density hard urethane foam provided by the invention is characterized in that preparing by following processing step and condition expansible black lead/rigid urethane foam of expansible black lead content 0～20wt%:
(1) weighing is by prescription weighing polyether glycol and isocyanic ester.
(2) dry polyether glycol and isocyanic ester 80 ℃ dry 12 hours down, dry postcooling to about 30 ℃ standby.
3) mix by prescription catalyzer trolamine and organotin, and whipping agent water joins in the polyether glycol, fully stir with mechanical stirring device, mix, then expansible black lead is joined wherein after the weighing by prescription, fully stir, mix with mechanical stirring device.
(4) the polymerization foaming joins isocyanic ester rapidly in the blending ingredients, fully stirs simultaneously, is poured in the mould after 30 seconds, closes die cap.
(5) aftertreatment is together put into baking oven with mould and polyurethane foam wherein, solidifies 4 hours down at 100 ℃, takes out postcooling.
(6) sample is taken out in the sample preparation die sinking, removes the surface skining layer, obtains the rigid urethane foam that expansible black lead is filled.
2. the method for utilizing expansible black lead to fill rigid urethane foam according to claim 1 also can add weight part and be 0.05～0.15 part catalyzer organotin when it is characterized in that mixed foaming.
3. the method for utilizing expansible black lead to fill rigid urethane foam according to claim 1 also can add weight part and be 0～0.2 part crosslinking catalyst trolamine when it is characterized in that mixed foaming.
4. the method for utilizing expansible black lead to fill rigid urethane foam according to claim 1 also can add weight part and be 1～4 part suds-stabilizing agent silicone oil when it is characterized in that mixed foaming.
5. the method for utilizing expansible black lead to fill rigid urethane foam according to claim 1 also can add weight part and be 0.05～0.1 part whipping agent distilled water when it is characterized in that mixed foaming.
6. the method for utilizing expansible black lead to fill rigid urethane foam according to claim 1 can add in the expansible black lead of expansion multiplying power 150～300 any one when it is characterized in that mixed foaming.
7. the method for utilizing expansible black lead to fill rigid urethane foam according to claim 6, the expansible black lead that it is characterized in that adding is in order to improve the flame retardant properties of rigid urethane foam.
8. the method for utilizing expansible black lead to fill rigid urethane foam according to claim 1 is characterized in that the density of the rigid urethane foam for preparing is 0.40～0.60g/cm
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| CN102367288A (en) * | 2011-09-08 | 2012-03-07 | 溧阳市山湖实业有限公司汽车装饰材料分公司 | Polyurethane foam composition |
| CN101987884B (en) * | 2009-08-03 | 2012-07-25 | 中蓝晨光化工研究设计院有限公司 | High oil absorption polyurethane foam and preparation method thereof |
| CN101265358B (en) * | 2008-05-13 | 2013-02-13 | 宁波万华容威聚氨酯有限公司 | Hard polyurethane foam, preparation method and application thereof |
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