CN104987851B - One kind electrolysis door filling polyurethane cellular glue and preparation method thereof - Google Patents

Abstract

The invention belongs to the technical field of chemical industry, and discloses a polyurethane cellular glue for filling an electrolytic door and a preparation method thereof. The polyurethane cellular glue is prepared from the following components in parts by weight: self-made polyurethane prepolymer 80-100, foaming agent 150-180, foam stabilizer 2-5, tackifying resin 35-40 and Active filler 50-80. The polyurethane cellular glue prepared by the invention is environmentally friendly, non-toxic and pollution-free, has good performance, fine and uniform foam, low cost, and reasonable curing speed; and the preparation method of the invention is simple and easy to implement, and can be applied to the field of electrolysis doors.

Description

A kind of polyurethane honeycomb adhesive for electrolytic door filling and preparation method thereof

technical field

The invention belongs to the technical field of chemical industry, and in particular relates to a polyurethane cellular glue for filling an electrolytic door and a preparation method thereof.

Background technique

Electrolytic door technology is a new type of indoor door preparation technology. The main material of electrolytic door is electrolytic plate, which is filled with polymer. It has the characteristics of beautiful appearance, corrosion resistance, deformation resistance and durability. The filler used as the electrolytic door should have the characteristics of pressure resistance and strong adhesion. However, in the prior art, fillers generally contain volatile, toxic and polluting substances, and their mechanical properties are poor. At present, the built-in filling of the electrolytic door mainly adopts polyurethane foamed honeycomb glue.

Polyurethane foamed cellular glue has excellent physical and mechanical properties, acoustic properties, electrical properties, and chemical resistance properties. Its market is growing continuously, especially in construction, automobiles, ships, and thermal insulation materials. Foamed polyurethane adhesive can be cured by water and moisture. After curing, it has the strength similar to that of plastic and has rubber-like toughness. At the same time, it has high bonding strength, oil resistance, water resistance, high temperature resistance, impact resistance, vibration resistance, electrical Good insulation and other characteristics, and easy processing.

Diisocyanates commonly used in polyurethane foams are fatty acid and aromatic types. However, the improvement of the cohesive strength of the adhesive by fatty acid diisocyanate is not obvious. Although aromatic dicyanate can significantly improve cohesive strength, commonly used aromatic diisocyanate such as toluene diisocyanate and diphenylmethane diisocyanate have deficiencies in varying degrees. Toluene diisocyanate has the characteristics of high vapor pressure and easy volatility, so it is very harmful. Diphenylmethane diisocyanate has the advantages of less toxicity and faster reaction than the former, but the pure product is generally solid at room temperature and inconvenient to use. In addition, its high activity easily forms dimers to produce gels.

The Chinese patent with the publication number CN 102295910A discloses a high-strength polyurethane cellular adhesive and a preparation method thereof. The polyurethane cellular adhesive prepared by the method has a stable viscosity, but the reported polyurethane foaming cellular adhesive mainly uses toluene diisocyanate and self-made The prepolymer synthesized by polyether polyol is used as the base material. Toluene diisocyanate is highly volatile and toxic, so the environmental performance of the polyurethane cellular adhesive needs to be improved. In addition, the self-made polyether polyol has disadvantages such as complex process and application performance to be improved.

Contents of the invention

In order to overcome the shortcomings and deficiencies of the prior art, the primary purpose of the present invention is to provide a polyurethane cellular glue for electrolytic door filling. The polyurethane honeycomb glue of the present invention has high environmental protection performance, non-toxic and pollution-free, high bonding strength, fine and uniform foam, low cost, and reasonable curing speed; it overcomes the poor environmental protection performance of existing products, low bonding strength and too fast curing speed And other defects, to meet the growing environmental protection requirements and technical improvement of the electrolytic door industry application requirements.

Another object of the present invention is to provide a preparation method of the above-mentioned polyurethane cellular glue for filling the electrolytic door.

The object of the present invention is achieved through the following technical solutions:

A polyurethane cellular glue for electrolytic door filling, prepared from the following components in parts by weight:

The self-made polyurethane prepolymer is prepared by the following method:

In a nitrogen atmosphere, drop polyether polyol into polyphenyl polymethylene polyisocyanate solution containing catalyst at 65-75°C, after the addition is complete, continue to react for 2.5-3.5 hours to obtain self-made polyurethane prepolymer .

The weight ratio of the polyether polyol to the polyphenyl polymethylene polyisocyanate is (30-60): (15-30); the polyphenyl polymethylene polyisocyanate solution is polyphenyl polymethylene polyisocyanate The methyl polyisocyanate is prepared by dissolving the organic solvent, and the weight ratio of the polyphenyl polymethylene polyisocyanate to the organic solvent is (15-30):(15-40). The dropping rate is 20-30 drops/min.

The polyether polyol is a kind of polyoxyethylene diol with a hydroxyl value of 37-61 mgKOH/g or a trimethylolpropane-propylene oxide polyether with a hydroxyl value of 42-112 mgKOH/g; the polyether polyol uses Pre-heat to 120-140°C and keep warm for 60-80 minutes.

The mass fraction of NCO in the polyphenyl polymethylene polyisocyanate is 30-33%.

The catalyst is triethylenediamine, bis(dimethylaminoethyl)ether, dimethylcyclohexylamine, dimethylethanolamine, N,N-bis(diiminopropyl)isopropanolamine , N-ethylmorpholine, dibutyltin dilaurate or stannous octoate. The weight ratio of the catalyst to the polyphenyl polymethylene polyisocyanate is (0.03-0.07): (15-30).

The organic solvent is one or more of ethyl acetate, propyl acetate, methyl ethyl ketone, methyl isopropyl ketone, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, toluene or xylene.

The foam stabilizer is one of stabilizer B8404, B8863Z, B8454, Silbk 9000, Silbk 9020 or Silbk9204.

The foaming agent is one or more of cyclopentane, n-pentane, isopentane, isobutane, n-butane or dichloromethane.

The tackifying resin is one of petroleum resin, terpene resin, coumarone resin and rosin resin; the petroleum resin is one or both of C5 resin or C9 resin.

The active filler is industrial light 325 mesh calcium carbonate, industrial 1000 mesh kaolin, industrial 2000 mesh wollastonite powder, industrial 350 mesh fine talcum powder, industrial 400 mesh muscovite, industrial 1000 mesh titanium dioxide, industrial 400 mesh barite powder or One or more types of industrial 1000 mesh carbon black.

The preparation method of the polyurethane cellular glue for filling the electrolysis door specifically comprises the following steps:

(1) Add the foam stabilizer and tackifying resin to the self-made polyurethane prepolymer at 65-75°C under a nitrogen atmosphere, and stir for 1-2 hours to obtain a uniformly dispersed system;

(2) Lower the temperature of the system in step (1) to 30-40°C, add foaming agent and active filler, and continue stirring for 30-40 minutes to obtain polyurethane cellular adhesive.

The rotational speed of stirring in step (1) is 300-500 r/min; the rotational speed of stirring in step (2) is 400-600 r/min.

The prepared polyurethane honeycomb glue has a solid content of 70% to 80%, a viscosity of 3000 to 4000mPa·s, an aluminum plate bond strength of 1.5 to 2.0Mpa, a shear strength of 0.8 to 1.0Mpa, and an elongation at break of 60 to 80%. The magnification is 12~15, the combustion level is B2, and the surface dry curing time is 120~150min.

The invention adopts polyphenyl polymethylene polyisocyanate, which is diphenylmethane diisocyanate multimer, has lower activity and vapor pressure than diphenylmethane diisocyanate, and is cheaper than it. Under the same mass, polyphenyl polymethylene polyisocyanate has more isocyanate groups, and reacts with water in the air to form more polyurethane-urea bonds during curing, and its own polyisocyanate can act similar to Self-crosslinking, so the styrofoam forms polymers with very large molecular weights. A large number of polyurethane-urea bonds in the polymer have very strong polarity, which is manifested in a very strong bond with the metal surface macroscopically. In addition, the content of isocyanate groups is high, the curing speed is fast, and the carbon dioxide produced with water is cured in the colloidal layer without diffusing out, so the foaming adhesive of the present invention has the characteristics of foaming while curing, and the foam is very fine and uniform.

Compared with prior art, the present invention has following advantage:

The polyurethane cellular adhesive of the present invention has high performance, environmental protection, non-toxicity and pollution-free, high bonding strength, fine and uniform foam, low cost, and reasonable curing speed; the preparation method of the present invention is simple and easy to realize; the polyurethane cellular adhesive for environmental protection filling is solid The content is 70%~80%, the viscosity is 3000~4000mPa s, the bond strength of aluminum plate is 1.5~2.0Mpa, the shear strength is 0.8~1.0Mpa, the elongation at break is 60~80%, the expansion ratio is 12~15, and the combustion grade B2 level, surface dry curing time 120 ~ 150min.

detailed description

In order to better understand the present invention, the present invention will be further described below in conjunction with examples, but the embodiments of the present invention are not limited thereto.

Example 1

A kind of polyurethane cellular glue for electrolytic door filling, prepared by the following method:

(1) Heat 50 parts by weight of polyoxyethylene diol with a hydroxyl value of 37 to 120° C., heat-preserve and react for 80 minutes, fully remove the moisture in the polyether, and obtain dehydrated polyether diol;

(2) The NCO mass fraction of 20 parts by weight is 30% polyphenyl polymethylene polyisocyanate and the ethyl acetate of 30 parts by weight are stirred evenly, add 0.05 parts by weight of triethylenediamine, obtain the polyphenyl polymethylene polyisocyanate containing catalyst Phenyl polymethylene polyisocyanate solution;

(3) All the polyphenyl polymethylene polyisocyanate solutions containing the catalyst in step (2) are warmed up to 75°C, and under a nitrogen atmosphere, all the polyether diols in step (1) are dropped into (dropped The speed should be 20 drops/min) into the isocyanate solution. After the dropwise addition, continue to react for 3.5 hours to obtain a self-made polyurethane prepolymer;

(4) In a nitrogen atmosphere and at 75°C, add 2 parts by weight of stabilizer B8404 and 35 parts by weight of rosin resin to 80 parts by weight of step (3) in the self-made polyurethane prepolymer, stir for 2h (the rotating speed of stirring is 300r/ min), to obtain a uniformly dispersed system;

(5) the system of step (4) is cooled to 30 DEG C, add the dichloromethane of 100 weight parts, the cyclopentane of 50 weight parts and the industrial light 325 order calcium carbonate of 50 weight parts, stir 30min (rotating speed is 530rr /min), to obtain polyurethane cellular glue.

The polyurethane honeycomb adhesive has a viscosity of 3150 mPa·s, an aluminum plate bonding strength of 1.5 Mpa, a shear strength of 1.0 Mpa, a foaming ratio of 12, a combustion grade of B2, and a curing time of 120 minutes.

Implementation column 2

A kind of polyurethane cellular glue for electrolytic door filling, prepared by the following method:

(1) heating 60 parts by weight of polyoxyethylene diol with a hydroxyl value of 56 to 140° C., and keeping it warm for 60 minutes to fully remove the moisture in the polyether to obtain dehydrated polyether diol;

(2) 25 parts by weight of NCO mass fraction are 30% polyphenyl polymethylene polyisocyanate and 15 parts by weight of toluene are stirred evenly, add 0.03 parts by weight of bis(dimethylaminoethyl) ether and 0.01 parts by weight parts by weight of triethylenediamine to obtain a catalyst-containing polyphenyl polymethylene polyisocyanate solution;

(3) All the catalyst-containing polyphenyl polymethylene polyisocyanate solutions in step (2) are heated to 70°C, and the polyether diol in step (1) is dropped into the isocyanate solution in a nitrogen atmosphere (the speed of dropping is 30 drops/min), after dropping, continue reaction 2.5h, obtain self-made polyurethane prepolymer;

(4) under nitrogen atmosphere and 70 DEG C, add 5 parts by weight of stabilizer B8863Z and 40 parts by weight of petroleum resin in the self-made polyurethane prepolymer of 100 parts by weight of step (3), stir for 2h (the rotating speed of stirring is 500r/ min), to obtain a uniformly dispersed system;

(5) The system of step (4) is cooled to 30 DEG C, add the cyclopentane of 180 weight parts and the industrial 1000 order kaolin of 40 weight parts and the industrial 2000 order wollastonite powder of 40 weight parts, stir 30min (rotating speed is 560r/ min), to obtain environmentally friendly polyurethane cellular glue.

The polyurethane honeycomb adhesive for environmental protection filling has a viscosity of 3060mPa·s, an aluminum plate bonding strength of 1.6Mpa, a shear strength of 0.8Mpa, a foaming ratio of 15, a combustion grade of B2, and a surface-dry curing time of 150min.

Implementation column 3

A kind of polyurethane cellular glue for electrolytic door filling, prepared by the following method:

(1) Heat 40 parts by weight of polyoxyethylene diol with a hydroxyl value of 61 to 120° C., heat-preserve and react for 80 minutes, fully remove the moisture in the polyether, and obtain dehydrated polyether diol;

(2) 25 parts by weight of NCO mass fraction are 30% polyphenyl polymethylene polyisocyanate and 15 parts by weight of xylene are stirred evenly, add 0.03 parts by weight of dimethylcyclohexylamine and 0.03 parts by weight of dilauric acid Acid dibutyltin, obtain the polyphenyl polymethylene polyisocyanate solution containing catalyst;

(3) Warm up all the catalyst-containing polyphenyl polymethylene polyisocyanate solutions in step (2) to 65°C, and drop the polyether diol in step (1) into the isocyanate solution under nitrogen atmosphere (the speed of dropping is 25 drops/min), after dropwise addition, continue reaction 2.5h, obtain self-made polyurethane prepolymer;

(4) In a nitrogen atmosphere and at 65°C, add 5 parts by weight of stabilizer B8454 and 35 parts by weight of terpene resin to the self-made polyurethane prepolymer of 90 parts by weight of step (3), stir for 1h (the rotating speed of stirring is 400r /min), to obtain a uniformly dispersed system;

(5) Cool the system in step (4) to 35°C, add 160 parts by weight of n-butane and 60 parts by weight of industrial 400-mesh barite powder, stir for 35 minutes (the rotating speed of stirring is 480r/min), and obtain environmentally friendly polyurethane Honeycomb glue.

The polyurethane honeycomb adhesive for environmental protection filling has a viscosity of 3258mPa·s, an aluminum plate bonding strength of 2.0Mpa, a shear strength of 1.0Mpa, a foaming ratio of 13, a combustion grade of B2, and a surface-dry curing time of 135min.

Implementation column 4

A kind of polyurethane cellular glue for electrolytic door filling, prepared by the following method:

(1) Heating 50 parts by weight of trimethylolpropane-propylene oxide polyether with a hydroxyl value of 42 to 140° C., and keeping it warm for 80 minutes to fully remove the moisture in the polyether to obtain dehydrated polyether glycol;

(2) The NCO mass fraction of 15 parts by weight is the polyphenyl polymethylene polyisocyanate of 30% and the propyl acetate of 35 parts by weight are stirred evenly, add 0.07 parts by weight of dimethylethanolamine, obtain the polyphenyl polyphenyl polyphenylene polyisocyanate containing catalyst Polymethylene polyisocyanate solution;

(3) Warm up all the catalyst-containing polyphenyl polymethylene polyisocyanate solutions in step (2) to 70°C, and drop the polyether triol in step (1) into the isocyanate solution under a nitrogen atmosphere (the speed of dropping is 23 drops/min), continue to react 3h, obtain self-made polyurethane prepolymer;

(4) under nitrogen atmosphere and 70 ℃, add 5 parts by weight of stabilizer Silbk 9000 and 40 parts by weight of coumarone resin and add in the self-made polyurethane prepolymer of 95 parts by weight of step (3), stir for 1.5h (stirred Rotating speed is 350r/min), obtains the uniformly dispersed system;

(5) Cool the system of step (4) to 40°C, add 170 parts by weight of isobutane and 70 parts by weight of industrial 400 mesh muscovite, stir for 38min (the rotating speed of stirring is 550r/min), and obtain an environmentally friendly polyurethane cellular glue .

The polyurethane honeycomb adhesive for environmental protection filling has a viscosity of 3368mPa·s, an aluminum plate bonding strength of 1.7Mpa, a shear strength of 0.9Mpa, a foaming ratio of 12, a combustion grade of B2, and a surface-dry curing time of 125min.

Implementation column 5

A kind of polyurethane cellular glue for electrolytic door filling, prepared by the following method:

(1) Heating 55 parts by weight of trimethylolpropane-propylene oxide polyether with a hydroxyl value of 67 to 130° C., keeping the temperature for 70 minutes, and fully removing the moisture in the polyether to obtain dehydrated polyether glycol;

(2) Stir 25 parts by weight of polyphenyl polymethylene polyisocyanate with a mass fraction of NCO of 33% and 20 parts by weight of methyl ethyl ketone evenly, add 0.03 parts by weight of N,N-bis(diiminopropyl) isocyanate Propanolamine, obtains the polyphenyl polymethylene polyisocyanate solution containing catalyst;

(3) Warm up all the catalyst-containing polyphenyl polymethylene polyisocyanate solutions in step (2) to 75°C, and drop the polyether diol in step (1) into the isocyanate solution under nitrogen atmosphere (the speed of dropping is 26 drops/min), after dropping, continue to react for 2.5h, obtain the self-made polyurethane prepolymer;

(4) under nitrogen atmosphere and 75 DEG C, add 2 parts by weight of stabilizer Silbk 9020 and 37 parts by weight of coumarone resin in the self-made polyurethane prepolymer of 85 parts by weight of step (3), stir for 2h (stirring speed 450r/min), to obtain a uniformly dispersed system;

(5) Cool the system in step (4) to 37°C, add 175 parts by weight of n-pentane and 60 parts by weight of industrial 400 mesh barite powder, stir for 35 minutes (the rotating speed of stirring is 450r/min), and obtain an environmentally friendly Polyurethane cellular glue.

The polyurethane honeycomb adhesive for environmental protection filling has a viscosity of 3391mPa·s, an aluminum plate bond strength of 1.8Mpa, a shear strength of 0.9Mpa, a foaming ratio of 15, a combustion grade of B2, and a surface-dry curing time of 130min.

Implementation column 6

A kind of polyurethane cellular glue for electrolytic door filling, prepared by the following method:

(1) Heating 40 parts by weight of trimethylolpropane-propylene oxide polyether with a hydroxyl value of 112 to 130° C., keeping the temperature for 75 minutes, and fully removing the moisture in the polyether to obtain a dehydrated polyether glycol;

(2) The NCO mass fraction of 30 parts by weight is 32% polyphenyl polymethylene polyisocyanate and the methyl isopropyl ketone of 25 parts by weight are stirred evenly, add 0.05 parts by weight of N-ethylmorpholine, obtain Catalyst-containing polyphenylpolymethylene polyisocyanate solution;

(3) Warm up all the catalyst-containing polyphenyl polymethylene polyisocyanate solutions in step (2) to 67°C, and drop the polyether triol in step (1) into the isocyanate solution under a nitrogen atmosphere (the speed of dropping is 27 drops/min), after dropping, continue reaction 3h, obtain self-made polyurethane prepolymer;

(4) under nitrogen atmosphere and 67 ℃, add 5 parts by weight of stabilizer Silbk 9204 and 40 parts by weight of rosin resin and add in the self-made polyurethane prepolymer of 80 parts by weight of step (3), stir 1.5h (the rotating speed of stirring is 480r/min), to obtain a uniformly dispersed system;

(5) The system in step (4) was cooled to 35° C., 180 parts by weight of methylene chloride and 50 parts by weight of industrial 1000 mesh carbon black were added, and stirred for 40 minutes (rotating speed was 500 r/min) to obtain an environmentally friendly polyurethane cellular glue.

The polyurethane honeycomb adhesive for environmental protection filling has a viscosity of 3658mPa·s, an aluminum plate bonding strength of 1.5Mpa, a shear strength of 0.9Mpa, a foaming ratio of 15, a combustion grade of B2, and a surface-dry curing time of 120min.

Implementation column 7

A kind of polyurethane cellular glue for electrolytic door filling, prepared by the following method:

(1) heating 30 parts by weight of trimethylolpropane-propylene oxide polyether with a hydroxyl value of 112 to 140° C., and keeping it warm for 60 minutes to fully remove the moisture in the polyether to obtain a dehydrated polyether glycol;

(2) 24 parts by weight of NCO mass fraction is 31% polyphenyl polymethylene polyisocyanate, 30 parts by weight of ethylene glycol monoethyl ether and 10 parts by weight of xylene are stirred evenly, add 0.03 parts by weight of dilauric acid Dibutyltin, obtains the polyphenyl polymethylene polyisocyanate solution containing catalyst;

(3) Warm up all the catalyst-containing polyphenyl polymethylene polyisocyanate solutions in step (2) to 72°C, and drop the polyether diol in step (1) into the isocyanate solution under a nitrogen atmosphere (the speed position of dropping is 28 drops/min), after dropping, continue reaction 2.5h, obtain the self-made polyurethane prepolymer;

(4) under nitrogen atmosphere and 72 DEG C, add 4 parts by weight of stabilizer B8404 and 40 parts by weight of rosin resin in the self-made polyurethane prepolymer of 100 parts by weight of step (3), stir for 1h (the rotating speed of stirring is 360r/ min), to obtain a uniformly dispersed system;

(5) Step (4) is cooled to 32°C, adding 150 parts by weight of isobutane and 50 parts by weight of industrial 350-mesh fine talcum powder, stirring for 40 minutes (the rotating speed of stirring is 600r/min), and an environmentally friendly polyurethane cellular glue is obtained .

The polyurethane honeycomb adhesive for environmental protection filling has a viscosity of 3720mPa·s, an aluminum plate bonding strength of 2.0Mpa, a shear strength of 0.8Mpa, a foaming ratio of 14, a combustion grade of B2, and a surface-dry curing time of 140min.

Implementation Column 8

A kind of polyurethane cellular glue for electrolytic door filling, prepared by the following method:

(1) heating 30 parts by weight of trimethylolpropane-propylene oxide polyether with a hydroxyl value of 112 to 140° C., and keeping it warm for 75 minutes to fully remove the moisture in the polyether to obtain a dehydrated polyether glycol;

(2) The NCO mass fraction of 20 parts by weight is 31% polyphenyl polymethylene polyisocyanate, the ethylene glycol monoethyl ether of 20 parts by weight and 20 parts by weight of ethyl acetate are stirred evenly, add 0.05 parts by weight of octanoic acid ethylene Tin, obtains the polyphenyl polymethylene polyisocyanate solution containing catalyst;

(3) Warm up all the catalyst-containing polyphenyl polymethylene polyisocyanate solutions in step (2) to 68°C, and drop the polyether diol in step (1) into the isocyanate solution under nitrogen atmosphere (the speed of dropping is 22 drops/min), after dropping, continue reaction 2.5h, obtain self-made polyurethane prepolymer;

(4) under nitrogen atmosphere and 68 ℃, add 4 parts by weight of stabilizer B8404 and 40 parts by weight of rosin resin in the self-made polyurethane prepolymer of 90 parts by weight of step (3), stir for 2h (the rotating speed of stirring is 460r/ min), to obtain a uniformly dispersed system;

(5) Step (4) was cooled to 33° C., 150 parts by weight of n-butane and 50 parts by weight of industrial 1000 mesh titanium dioxide were added, and stirred for 40 minutes (the stirring speed was 400 r/min) to obtain an environmentally friendly polyurethane cellular glue.

The polyurethane honeycomb adhesive for environmentally friendly filling has a viscosity of 3879mPa·s, an aluminum plate bonding strength of 1.6Mpa, a shear strength of 1.0Mpa, a foaming ratio of 13, a combustion grade of B2, and a surface-dry curing time of 145min.

The above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. For those of ordinary skill in the art, on the basis of the above description, other changes or changes in different forms can also be made. It is not necessary and impossible to exhaustively list all the implementation manners here. All modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (8)

1. polyurethane cellular glue is used in one kind electrolysis door filling, it is characterised in that：Prepared by the following component counted by weight and Into：

The self-control base polyurethane prepolymer for use as, which is prepared by the following method, to be obtained：

In nitrogen atmosphere, in 65~75 DEG C, PPG is instilled into many isocyanides of the polyphenyl polymethylene containing catalyst In acid esters solution, completion of dropping continues to react 2.5~3.5h, obtains making base polyurethane prepolymer for use as by oneself；

The weight ratio of the PPG and polyphenyl polymethylene polyisocyanates is (30~60)：(15~30)；

The PPG is one kind of Polyoxyethylene glycol or trimethylolpropane-propylene oxide polyethers；The polyoxy The hydroxyl value for changing ethylene glycol is 37~61mgKOH/g, the hydroxyl value of the trimethylolpropane-propylene oxide polyethers for 42~ 112mgKOH/g；

NCO mass fractions are 30~33% in the polyphenyl polymethylene polyisocyanates；

The tackifying resin is one kind in Petropols, terpene resin, coumarone indene resin or rosin resin.

2. polyurethane cellular glue is used in the filling of electrolysis door according to claim 1, it is characterised in that：

The polyphenyl polymethylene polyisocyanates solution is that polyphenyl polymethylene polyisocyanates are dissolved in organic solvent system It is standby to obtain；The weight ratio of the polyphenyl polymethylene polyisocyanates and organic solvent is (15~30)：(15~40)；

The weight ratio of the catalyst and polyphenyl polymethylene polyisocyanates is (0.03~0.07)：(15~30).

3. polyurethane cellular glue is used in the filling of electrolysis door according to claim 1, it is characterised in that：

The catalyst be triethylenediamine, double (dimethyl amido ethyl) ethers, dimethyl cyclohexyl amine, dimethylethanolamine, In double (diimino propyl group) isopropanolamine, N-ethylmorpholine, dibutyl tin laurate or the stannous octoates of N, N- it is a kind of with On；

The organic solvent is ethyl acetate, propyl acetate, MEK, methyl isopropyl Ketone, ethylene glycol monoethyl ether, ethylene glycol list Propyl ether, toluene or dimethylbenzene more than one.

4. polyurethane cellular glue is used in the filling of electrolysis door according to claim 1, it is characterised in that：The rate of addition be 20~ 30 drops/min；

The PPG is using being preceding heated to 120~140 DEG C, 60~80min of insulation reaction.

5. polyurethane cellular glue is used in the filling of electrolysis door according to claim 1, it is characterised in that：The foam stabiliser is steady Determine agent B8404, B8863Z, B8454, Silbk 9000, Silbk 9020 or Silbk 9204 one kind；

The foaming agent is more than one of pentamethylene, pentane, isopentane, iso-butane, normal butane or dichloromethane.

6. polyurethane cellular glue is used in the filling of electrolysis door according to claim 1, it is characterised in that：The active filler is industry The mesh calcium carbonate of lightweight 325, industrial 1000 mesh kaolin, industrial 2000 mesh wollastonite in powder, the industrial fine and smooth stone flour of 350 mesh, industry 400 Mesh muscovite, industrial 1000 mesh titanium dioxide, industrial 400 mesh blanc fixe or industrial 1000 mesh carbon black more than one.

7. according to the preparation method of any one of the claim 1~6 electrolysis door filling polyurethane cellular glue, its feature exists In：Specifically include following steps：

(1) under the atmosphere of nitrogen, in 65~75 DEG C, foam stabiliser and tackifying resin are added into self-control base polyurethane prepolymer for use as In, 1~2h is stirred, finely dispersed system is obtained；

(2) system in step (1) is cooled to 30~40 DEG C, adds foaming agent and active filler, continue to stir 30~ 40min, obtains polyurethane cellular glue.

8. electrolysis door fills the preparation method with polyurethane cellular glue according to claim 7, it is characterised in that：Step (1) Described in the rotating speed that stirs be 300~500r/min；The rotating speed stirred described in step (2) is 400~600r/min.