CN109763422A - A kind of joint filling structure and its construction technology with modified isocyanate buffer layer - Google Patents
A kind of joint filling structure and its construction technology with modified isocyanate buffer layer Download PDFInfo
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- CN109763422A CN109763422A CN201811633446.2A CN201811633446A CN109763422A CN 109763422 A CN109763422 A CN 109763422A CN 201811633446 A CN201811633446 A CN 201811633446A CN 109763422 A CN109763422 A CN 109763422A
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Abstract
The present invention relates to a kind of joint filling structures and its construction technology with modified isocyanate buffer layer, belong to technical field of polymer materials.Including being equipped with buffer layer positioned at the base coating surface of concrete seam body side surface, being filled with elastomer between buffer layer coated on the priming coat of edge and side on concrete seam body.The following steps are included: 1), test concrete seam body moisture content≤35%；2) concrete, is stitched into edge and side on body and is polishing to smooth, cleaning；3), priming coat is uniformly brushed to edge and side on concrete seam body；4), buffer layer is coated on the priming coat of side in a manner of scratching；5), in buffering interlayer cast elastomers.The present invention both can effectively solve the problem that falls off of primary coat and elastomer; and concrete can be made to stitch body joint filling structural bond intensity >=2.5MPa; and fracture occurs inside elastomer, protection concrete-primary coat, primary coat-buffer layer, each interfacial bonding face of buffer layer-elastomer are intact.
Description
Technical field
The present invention relates to a kind of joint filling structures and its construction technology with modified isocyanate buffer layer, belong to macromolecule
Field of material technology.
Background technique
Bridge joint filling plays weight as the important connecting component between bridge beam end, to the damping of bridge end and waterproof performance
It acts on.Traditional joint filling is two fashioned iron to be embedded in the cement at gap both ends, then rubber weather strip is filled in
It is closely coupled to play the role of preventing clearance leakage by fashioned iron and sealing strip in fashioned iron.Rubber and fashioned iron linked vector graph
For card slot connection, due to Rig up error and sealing strip aging etc. caused by sealing strip fall off, it is different degrees of it is damaged even
Cracking loses damping, carrying, drain function.And because fashioned iron notch is mostly in bridge floor side, so installation and replacement are extremely difficult.
Elastomer joint filling is easy for construction, and price is relatively low, is widelyd popularize.Entire joint filling by high molecular material into
Row filling, the concrete side walls of two latasuture bodies have one layer of very thin priming coat, fill elastic water-proofing material in primary coat interlayer.This is filled out
Seam device can show elasticity in transient load and high-frequency vibration, and can show plasticity in the case where low frequency delays power effect.Elastomer is logical
The mechanical property of itself is crossed to adapt to the deformation of filling out of bridge, therefore elastomeric material comprehensive performance is required very high.
Elastomer joint filling at present has following three:
1, elastomer is Nian Jie with beam-ends bad.Concrete stitches body construction outdoors, general expansion joint construction requirement concrete base layer
Moisture content≤20%, but run into the cloudy day, the weather that humidity is high, temperature is low, concrete moisture content is difficult control within 20%, in addition
Requirement is also usually reduced in order to control construction speed when working to tight deadlines, moisture content is not up to standard to cause adhesive property bad；
2, beam-ends and elastomer are easy to fall off.Seam body be concrete material, in order in closed concrete basal plane pore moisture and
Air increases the adhesive strength of elastomer and concrete, can brush one layer of epoxy primary coat on seam body concrete surface.Epoxy is rigidity
Material, hardness is between 70 ∽ 90D, elasticity modulus >=1GPa.And " concrete stitches the provisional technical conditions of body elasticity body joint filling " wants
Ask elastomeric material hardness requirement in 20 ~ 30A, 100% tensile modulus of elasticity≤0.3MPa.Due to the consistency and elasticity body of primary coat
Hardness is not an order of magnitude, and primary coat elasticity modulus is more than 3000 times of elastomer, the consistency and elasticity mould of primary coat and elastomer
Amount difference is too big, even if causing adhesive strength test value between the two higher, automobile or train are directly born in joint filling for a long time
It vibrates, is also easy to fall off repeatedly；
3, elastomer cracky.Temperature and contraction cause joint filling maximum deformation quantity to can reach 40%, and the displacement capacity of sealing material is answered
Reach 50%.Due to the deformation characteristics of high-speed railway, joint filling should select the joint filling sealing material of low modulus.The elastomer now used
Fatigue durability is poor, and elastomer elongation is low, and elasticity modulus is high, and elastomer is caused to be easy cracking.
Three above problem, which will lead to pointing, can not adapt to the deformation of concrete structure under different temperatures, off-seam occur
And problem of Cracking, or even fall off.Pointing shock-absorbing function after damage reduces, and water-stagnating effect is bad, loses beam-ends guarded drainage
Function.
It would therefore be highly desirable to provide a kind of joint filling structure and its construction technology that can solve above-mentioned technical problem.
Summary of the invention
It is an object of the invention to solve the shortcomings of the prior art, providing one kind can effectively solve primary coat
With elastomer because falling off problem when hardness differs too big and constructs caused by the excessive factor influence of concrete moisture moisture content,
And concrete can be made to stitch body joint filling structural bond intensity >=2.5MPa, and be broken and occur inside elastomer, protect concrete-bottom
The intact joint filling with modified isocyanate buffer layer in painting, primary coat-buffer layer, each interfacial bonding face of buffer layer-elastomer
Structure and its construction technology.
A kind of joint filling structure with modified isocyanate buffer layer, it is characterised in that including stitching body 1 coated on concrete
The priming coat 2 on upper edge and side, 2 surface of priming coat positioned at concrete seam 1 side of body are equipped with buffer layer 3, fill out between buffer layer 3
Filled with elastomer 4；
Preferably, thickness≤2mm of the modified buffer layer 3, buffer layer 3 and 2 adhesive strengths of priming coat >=2.5MPa, with elasticity
Body adhesive strength >=2.5MPa, 100% tensile modulus of elasticity 2.5-5.5MPa, hardness 45-83A, preferably 100% tensile elasticity mould
Amount is between 3-4.5MPa, and hardness is between 55-80A；
Preferably, the 4 rationality energy of elastomer object are as follows: 100% tensile modulus of elasticity≤0.3MPa, tensile strength >=2.5MPa are broken
Split elongation >=800%, preferably 100% tensile modulus of elasticity≤0.2MPa, elongation at break >=850%, low modulus, high elongation rate
So that pulling force when shaking deformation between joint filling be in smaller state, alleviates the stress between concrete and joint filling significantly；
Preferably, the concrete seam body 1 is that bridge stitches seam body between body, building, balcony seam body and various concrete extension joints
Etc. any one in various seam bodies；
Preferably, the priming coat 2 is water-base epoxy primary coat, any one in oiliness epoxy primary coat, which can effectively seal
The moisture and air in seam body concrete basal plane pore are closed, avoids vacuum and bulge phenomenon occur after coating buffering, and should
Primary coat viscosity is low, can penetrate into well in the pore of concrete and clog pore, high with concrete base layer adhesive strength,
The adhesive strength of substrate and buffering is improved, primary coat is had excellent performance, and does solid work the time≤12h, the adhesive strength of primary coat and concrete
≥3.5MPa；
A kind of construction technology of the joint filling structure with modified isocyanate buffer layer, is characterized in that including following step
It is rapid:
1, moisture content≤35% of test concrete seam body 1；
2, concrete is stitched into edge and side on body 1 and is polishing to smooth, cleaning；
3, priming coat 2 is uniformly brushed to edge and side on concrete seam body 1；
4, after the drying of priming coat 2 is tack-free to surface, buffer layer 3 is coated on side priming coat 2 in a manner of blade coating；
5, layer 3 to be buffered it is dry to surface it is tack-free after, in 3 cast elastomers 4 of buffer layer.
Preferably, the buffer layer 3 is double-component polyurethane coating, including first component and second component, component A and second group
Part mixes according to the ratio of mass ratio 1:1.5-1:2.5；
The component A includes the raw material of following mass parts: 2 20-90 parts of degree of functionality polyethers, 5-20 parts of 3 degree of functionality polyethers, plasticising
10-40 parts of agent, 1-10 parts of naphthenic oil, 10-20 parts of isocyanates；
The component B includes the raw material of following mass parts: 2 5-15 parts of degree of functionality polyethers, amine solid chain extender 4,4'- diamino
2-10 parts of base -3,3'- dichloro diphenyl methane (MOCA), amine liquid chain extender 4,4'- diamino -3,3'- diethyl-hexichol first
0-8 parts of alkane (MOEA), 50-100 parts of powder, dispersing aid 0-3 parts of coupling, 0.3-2 parts of catalyst, disappears at 50-180 parts of plasticizer
0.2-0.8 parts of infusion.Wherein, MOCA and MOEA is used cooperatively, and so that the hardness of buffer layer 3 is existed in 45 ∽ 83A, elasticity modulus
2.5 sections ∽ 5.5MPa are adjustable, are coupled the addition of dispersing aid, increase the adhesive strength between buffer layer and primary coat, elastomer；
Preferably, the 2 degree of functionality polyethers includes 0-30 parts of 1000 molecular weight polyether, 0-50 parts of 2000 molecular weight polyether, 4000
0-90 parts of molecular weight polyether, for one or both of above-mentioned three kinds mixing；Isocyanates is toluene di-isocyanate(TDI), diphenyl
Any one in methane diisocyanate, Carbodiimide-Modified MDI or two or more mixing；The plasticizer is acetyl lemon
The mixing of one or more of lemon acid tri-n-butyl, neck dibatyl phithalate, chlorinated paraffin.
Preferably, the component A further includes 1-10 parts of mineral oil；The component B further include: 0-2 parts of pigment, thixotropic agent
0-2 parts；
Preferably, the second component powder includes 0-80 parts of talcum powder, 0-90 parts of coarse whiting；
Preferably, the dispersing agent that is coupled is any one in polymeric carboxylic, high molecular polymer, modified polyorganosiloxane class
Or two kinds of mixing；
Preferably, the catalyst is organo-bismuth, organotin, liquid amines catalyst triethylenediamine, N- dionin quinoline
In any two or more mixing；
Preferably, the thixotropic agent is organobentonite, the one or more of fumed silica, rilanit special are mixed
It closes；
Preferably, the defoaming agent is polysiloxane-based, modified polyorganosiloxane class defoaming agent one or two kinds of mixing；
Preferably, the component A preparation process is as follows:
2 degree of functionality polyethers, the 3 degree of functionality polyethers 330N, plasticizer, mineral oil, naphthenic oil of metering are added in a kettle, are arranged
Oily circulating temperature controls 110 ± 5 DEG C of machine temperature, and anti-matchmaker's temperature starts to vacuumize to 90 DEG C, keeps pressure 0.04-0.05MPa 30
∽ 40min boosts to -0.08-0.1MPa when anti-matchmaker's temperature is raised to 110 DEG C of 105 ∽, is kept for 1.5 ∽ 2 hours, tests it
Moisture content stops vacuumizing until moisture content≤0.05%, and oily circulating temperature is arranged and controls machine temperature 60 C, anti-matchmaker's temperature is down to
65 DEG C hereinafter, addition isocyanates, heating, anti-matchmaker's temperature is in 80 ± 3 DEG C of reaction 2.5-3h, when-the NCO of measurement reaction system contains
Amount stops reaction when reaching theoretical value, cools to 60 DEG C, 20 ± 5min of vacuum defoamation obtains component A.
Preferably, the component B preparation process is as follows:
2 degree of functionality polyethers DL-2000D, plasticizer, MOEA, the coupling dispersing aid of metering are added in a kettle, setting oil follows
90 ± 5 DEG C of ring temperature controller temperature, anti-matchmaker's temperature 60 ± 5 DEG C of addition talcum powder, dicalcium powders, MOCA, anti-matchmaker's temperature 70 C add
Enter phthalocyanine blue, 90 DEG C start to vacuumize, and keep 30 ∽ 40min of -0.04 ∽ -0.05MPa of pressure, and oily circulating temperature control is arranged
110 ± 5 DEG C of machine temperature, when anti-matchmaker's temperature is warming up to 110 DEG C of 105 ∽, adjustment pressure to -0.08 ∽ -0.1MPA keeps 1.5
∽ 2 hours, test its moisture content, until moisture content≤0.05%, stop vacuumizing, setting temperature 60 C hereinafter, plus catalyst,
Thixotropic agent, defoaming agent keep -0.06 ∽ -0.07MPa of pressure stirring 20 ± 5min of deaeration to get the second component.
Joint filling structure with modified isocyanate buffer layer of the invention increases buffer layer, and buffer layer can play two
Effect: (1) cushioning layer firmness and elasticity modulus are moderate, play buffer function in priming coat and elastomer, avoid high rigidity,
High elastic modulus primary coat and soft, low modulus elastomer it is direct bonding.In test of many times, the bonding for not setting buffer layer is surveyed
Examination is separated from elastomer and primary coat, and elastomer can take the lead in internal disconnected when testing joint filling structural bond intensity after increase buffer layer
It splits.Attached drawing 2 is current double-layer structure, the base coat on concrete, in priming coat upper elastomer, by GB/T
16777-2008 carries out adhesive strength test, and elastomer is separated with priming coat when double-layer structure.Attached drawing 3 is three-decker, coagulation
Base coat on soil scratches buffer layer, then cast elastomers on priming coat, carries out adhesive strength survey by GB/T 16777-2008
Examination, three-decker is from elastomer internal break；(2), buffer layer can play resistance effect, which can be in concrete
Construction, it is bad to solve the problems, such as that low temperature and concrete high-moisture percentage are bonded in 35% range of beam-ends moisture moisture content.It is tied from test
From the point of view of fruit, at present primary coat thickness it is general≤0.2mm(railway expansion joint tentative standard is when surveying elastomer adhesive strength, it is desirable that bottom
Applying thickness is≤0.2mm), from the point of view of actual test, primary coat coating is too thin can not to be played the role of completely cutting off aqueous vapor completely, and this point
Often ignored by construction party.On the one hand the modified isocyanate buffer layer that the present invention adds contains isocyanato, Ke Yiyu
Steam reaction is oozed out in primary coat, guarantees cohesive force, another aspect buffer layer is thicker (thickness≤2mm), can effectively close steam；This
The advantages of invention is for concrete seam body elasticity body joint filling structure composition three-decker, priming coat increase concrete beam end with
The adhesive strength of joint filling, buffer layer strengthen the bonding force of elastomer and primary coat, and low modulus elastomer elasticity modulus is low, elongation
Height, makes to be bonded end face pulling force and be in smaller state, and can follow joint filling fills out deformation, efficiently solves joint of bridge damping and imitates
Fruit is poor, easy to crack, the inadequate disadvantage of bearing capacity.
Detailed description of the invention
Fig. 1: a kind of structural schematic diagram of the joint filling structure with modified isocyanate buffer layer of the present invention:
Fig. 2: the bonding lab diagram of buffer layer is not set；
Fig. 3: increase the bonding lab diagram of buffer layer.
Specific embodiment
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without making creative work belongs to the model that the present invention protects
It encloses.
A kind of joint filling structure with modified isocyanate buffer layer, including coated on edge and side on concrete seam body 1
Priming coat 2,2 surface of priming coat positioned at concrete seam 1 side of body is equipped with buffer layer 3, elastomer is filled between buffer layer 3
4；
Thickness≤2mm of modified buffer layer 3, buffer layer 3 and 2 adhesive strengths of priming coat >=2.5MPa, with 4 adhesive strength of elastomer
>=2.5MPa, 100% tensile modulus of elasticity 2.5-5.5MPa, hardness 45-83A, preferably 100% tensile modulus of elasticity is in 3-
Between 4.5MPa, hardness is between 55-80A；
4 rationality energy of elastomer object are as follows: 100% tensile modulus of elasticity≤0.3MPa, tensile strength >=2.5MPa, elongation at break >=
800%, preferably 100% tensile modulus of elasticity≤0.2MPa, elongation at break >=850%, low modulus, high elongation rate make to shake between joint filling
Pulling force when dynamic deformation is in smaller state, the significantly stress between alleviation concrete and joint filling；
It is that bridge stitches seam body between body, building, the balcony seam various seam bodies such as body and various concrete extension joints that concrete, which stitches body 1,
In any one；
Priming coat 2 is water-base epoxy primary coat, any one in oiliness epoxy primary coat, which can effective closing seam body concrete
Moisture and air in basal plane pore avoid vacuum and bulge phenomenon occur after coating buffering, and the primary coat viscosity is low, energy
Penetrate into the pore of concrete and clog pore well, it is high with concrete base layer adhesive strength, improve substrate with
The adhesive strength of buffering, primary coat are had excellent performance, and do solid work the time≤12h, adhesive strength >=3.5MPa of primary coat and concrete；
A kind of construction technology of the joint filling structure with modified isocyanate buffer layer, comprising the following steps:
1, moisture content≤35% of test concrete seam body 1；
2, concrete is stitched into edge and side on body 1 and is polishing to smooth, cleaning；
3, priming coat 2 is uniformly brushed to edge and side on concrete seam body 1；
4, after the drying of priming coat 2 is tack-free to surface, buffer layer 3 is coated on side priming coat 2 in a manner of blade coating；
5, layer 3 to be buffered it is dry to surface it is tack-free after, in 3 cast elastomers 4 of buffer layer.
Buffer layer 3 is double-component polyurethane coating, including first component and second component, and component A and component B are according to mass ratio
1:1.5-1:2.5 ratio mixing；
Component A includes the raw material of following mass parts: 2 20-90 parts of degree of functionality polyethers, 5-20 parts of 3 degree of functionality polyethers, plasticizer
10-40 parts, 1-10 parts of naphthenic oil, 10-20 parts of isocyanates；
Component B includes the raw material of following mass parts: 2 5-15 parts of degree of functionality polyethers, diamino -3 amine solid chain extender 4,4'-,
2-10 parts of 3'- dichloro diphenyl methane (MOCA), amine liquid chain extender 4,4'- diamino -3,3'- diethyl-diphenyl-methane
(MOEA) 0-8 parts, 50-180 parts of plasticizer, 50-100 parts of powder, dispersing aid 0-3 parts of coupling, 0.3-2 parts of catalyst, defoaming
0.2-0.8 parts of agent.Wherein, MOCA and MOEA is used cooperatively, make the hardness of buffer layer 3 45 ~ 83A, elasticity modulus 2.5 ~
The section 5.5MPa is adjustable, is coupled the addition of dispersing aid, increases the adhesive strength between buffer layer and primary coat, elastomer；
2 degree of functionality polyethers include 0-30 parts of 1000 molecular weight polyether, 0-50 parts of 2000 molecular weight polyether, 4000 molecular weight polyether 0-
90 parts, for one or both of above-mentioned three kinds mixing；Isocyanates is toluene di-isocyanate(TDI), diphenylmethane diisocyanate
Any one in ester, Carbodiimide-Modified MDI or two or more mixing；The plasticizer is the positive fourth of acetyl tributyl citrate three
The mixing of one or more of ester, neck dibatyl phithalate, chlorinated paraffin.
Component A further includes 1-10 parts of mineral oil；The component B further include: 0-2 parts of pigment, 0-2 parts of thixotropic agent；
Second component powder includes 0-80 parts of talcum powder, 0-90 parts of coarse whiting；
Coupling dispersing agent is polymeric carboxylic, high molecular polymer, any one or two kinds of mixing in modified polyorganosiloxane class；
Catalyst is organo-bismuth, organotin, any two kinds in liquid amines catalyst triethylenediamine, N- dionin quinoline
The above mixing；
Thixotropic agent is one or more kinds of mixing of organobentonite, fumed silica, rilanit special；
Defoaming agent is polysiloxane-based, modified polyorganosiloxane class defoaming agent one or two kinds of mixing；
Component A preparation process is as follows:
2 degree of functionality polyethers, the 3 degree of functionality polyethers 330N, plasticizer, mineral oil, naphthenic oil of metering are added in a kettle, are arranged
Oily circulating temperature controls 110 ± 5 DEG C of machine temperature, and anti-matchmaker's temperature starts to vacuumize to 90 DEG C, keeps pressure 0.04-0.05MPa 30
∽ 40min boosts to -0.08-0.1MPa when anti-matchmaker's temperature is raised to 110 DEG C of 105 ∽, is kept for 1.5 ∽ 2 hours, tests it
Moisture content stops vacuumizing until moisture content≤0.05%, and oily circulating temperature is arranged and controls machine temperature 60 C, anti-matchmaker's temperature is down to
65 DEG C hereinafter, addition isocyanates, heating, anti-matchmaker's temperature is in 80 ± 3 DEG C of reaction 2.5-3h, when-the NCO of measurement reaction system contains
Amount stops reaction when reaching theoretical value, cools to 60 DEG C, 20 ± 5min of vacuum defoamation obtains component A.
Component B preparation process is as follows:
2 degree of functionality polyethers DL-2000D, plasticizer, MOEA, the coupling dispersing aid of metering are added in a kettle, setting oil follows
90 ± 5 DEG C of ring temperature controller temperature, anti-matchmaker's temperature 60 ± 5 DEG C of addition talcum powder, dicalcium powders, MOCA, anti-matchmaker's temperature 70 C add
Enter phthalocyanine blue, 90 DEG C start to vacuumize, and keep 30 ∽ 40min of -0.04 ∽ -0.05MPa of pressure, and oily circulating temperature control is arranged
110 ± 5 DEG C of machine temperature, when anti-matchmaker's temperature is warming up to 110 DEG C of 105 ∽, adjustment pressure to -0.08 ∽ -0.1MPA keeps 1.5
∽ 2 hours, test its moisture content, until moisture content≤0.05%, stop vacuumizing, setting temperature 60 C hereinafter, plus catalyst,
Thixotropic agent, defoaming agent keep -0.06 ∽ -0.07MPa of pressure stirring 20 ± 5min of deaeration to get the second component.
Epoxy primer as used in the following examples, for the ring that commercially available common epoxy resin is E44, curing agent is amine
Oxygen primary coat, elastomer are energy saving science and technology 9816 elastomer of Group Co., Ltd trade mark WANPROOF of ten thousand China, part of reagent
It is as follows with pigment purchase situation:
DL-1000D, DL-1000D, DL-1000D, EP-330NY: blue star east is big；
Methyl diphenylene diisocyanate (MDI-50): ten thousand Hua Huaxue；
4,4'- diamino -3,3'- dichloro diphenyl methane (MOCA): Hunan garden special type Fine Chemical Co., Ltd；
4,4'- diamino -3,3'- diethyl-Hunan the garden diphenyl-methane (MOEA) special type Fine Chemical Co., Ltd；
Talcum powder and powdered whiting: Jiangxi Ao Te powder Co., Ltd；
Dibutyl tin dilaurate: moral sound chemistry；
Triethylenediamine (A33): Xin Dian chemical material Co., Ltd.
Embodiment 1
Epoxy bottom coating 2, the cast elastomers between side priming coat 2, elasticity are equipped on the upper edge of concrete seam body 1 and side
100% tensile modulus of elasticity of body≤0.2MPa；
Embodiment 2
It is equipped with epoxy bottom coating 2 on the upper edge of concrete seam body 1 and side, buffer layer 3, buffering are equipped on side priming coat 2
Layer 3 100% tensile modulus of elasticity 1.5MPa, hardness 38A.In 3 cast elastomers 4 of buffer layer, elastomer 4 100% stretches bullet
Property modulus≤0.2MPa.
Embodiment 3
It is equipped with epoxy bottom coating 2 on the upper edge of concrete seam body 1 and side, buffer layer 3, buffering are equipped on side priming coat 2
Layer 3 100% tensile modulus of elasticity 2.5MPa, hardness 45A.In 3 cast elastomers 4 of buffer layer, elastomer 4 100% stretches bullet
Property modulus≤0.2MPa.
Embodiment 4
It is equipped with epoxy bottom coating 2 on the upper edge of concrete seam body 1 and side, buffer layer 3, buffering are equipped on side priming coat 2
Layer 3 100% tensile modulus of elasticity 3.5MPa, hardness 60A.In 3 cast elastomers 4 of buffer layer, elastomer 4 100% stretches bullet
Property modulus≤0.2MPa.
Embodiment 5
It is equipped with epoxy bottom coating 2 on the upper edge of concrete seam body 1 and side, buffer layer 3, buffering are equipped on side priming coat 2
Layer 3 100% tensile modulus of elasticity 4MPa, hardness 68A.In 3 cast elastomers 4 of buffer layer, 4 100% tensile elasticity of elastomer
Modulus≤0.2MPa.
Embodiment 6
It is equipped with epoxy bottom coating 2 on the upper edge of concrete seam body 1 and side, buffer layer 3, buffering are equipped on side priming coat 2
Layer 3 100% tensile modulus of elasticity 4.5MPa, hardness 77A.In 3 cast elastomers 4 of buffer layer, elastomer 4 100% stretches bullet
Property modulus≤0.2MPa.
Embodiment 7
It is equipped with epoxy bottom coating 2 on the upper edge of concrete seam body 1 and side, buffer layer 3, buffering are equipped on side priming coat 2
Layer 3 100% tensile modulus of elasticity 5.5MPa, hardness 83A.In 3 cast elastomers 4 of buffer layer, elastomer 4 100% stretches bullet
Property modulus≤0.2MPa.
Embodiment 8
It is equipped with epoxy bottom coating 2 on the upper edge of concrete seam body 1 and side, buffer layer 3, buffering are equipped on side priming coat 2
Layer 3 100% tensile modulus of elasticity 6.5MPa, hardness 90A.In 3 cast elastomers 4 of buffer layer, 100% tensile elasticity of elastomer
Modulus≤0.2MPa.
Embodiment 9
It is equipped with epoxy primary coat 2 on the upper edge of concrete seam body 1 and side, buffer layer 3, buffer layer are equipped on side priming coat 2
3100% tensile modulus of elasticity 4MPa, hardness 68A.In 3 cast elastomers 4 of buffer layer, 100% tensile modulus of elasticity of elastomer
For 0.5MPa.
The raw material composition of embodiment 2-9 buffer layer is as follows:
Table one: the raw material composition of embodiment 2-9 buffer layer
All the components unit in table is Kg.
MOCA's and MOEA is used cooperatively, and makes the hardness of buffer layer in 45 ~ 83A, elasticity modulus in the section 2.5 ~ 5.5MPa
It is adjustable, it is coupled the addition of dispersing aid, increases the adhesive strength between buffer layer and primary coat, elastomer.
Embodiment 1-9 is tested by " concrete stitches the provisional technical conditions of body elasticity body joint filling ".
1, test item and method
1.1, adhesive strength: test method is tested according in CB/T 16,777 7 regulation.
1.2, low-cycle fatigue is tested: test method is by " concrete stitches the provisional technical conditions of body elasticity body joint filling " appendix A .1
Experiment, experimental elasticity body material is poured and is bonded in two pieces of parallel cement substrate surfaces prepares test specimen.Test specimen item according to the rules
After the stretching circulation experiment of part, record bonding or cohesional failure situation.
Sample, which is placed under test temperature, at least places 4h, removes the pad on test specimen, and test specimen is packed into puller system and constant temperature
In case, with the speed tensile of 5-6mm/min to equilbrium position, then with the speed progress fatigue test of 0.01Hz.
Table two: low cycle fatigue test
1.3, adhesion strength method for making sample
1 sample making course of embodiment is as follows:
Sample preparation conserves 23 ± 2 DEG C of room temperature, humidity 50 ± 5%.The cement block of 70mm*70mm*20mm is polished with sand paper, is removed
Floating ash, paints the primary coat of a layer thickness about 0.2mm, and cement block facade is placed 6h, takes elastomer A, B to expect after 6 h, electric stirring
Blade coating is tested after 48h on priming coat after 3-5 minutes.
Embodiment 2-9 sample making course is as follows:
Sample preparation conserves 23 ± 2 DEG C of room temperature, humidity 50 ± 5%.The cement block of 70mm*70mm*20mm is polished with sand paper, is removed
Floating ash, paints the primary coat of a layer thickness about 0.2mm, and cement block facade is placed 6h, the buffer layer of 1mm thickness is scratched after 6h, is stood
Place 1.5h in face；After 1.5h, elastomer A, B is taken to expect, electric stirring scratches on the buffer layer after 3-5 minutes.It is tested after 48h.
2, test result
Table three: adhesive strength test result
Table four: low week experimental result
As can be seen from Table III, all test object adhesive strengths all meet " the concrete seam provisional technology item of body elasticity body joint filling
Part " require elastomer adhesive strength >=1.5MPa index.Embodiment 1 do not have buffer layer, when adhesive strength is very low just with bottom
It applies and separates.Embodiment 2-9 increases buffer layer, and adhesive strength significantly improves, and 2 buffer layer elasticity modulus of embodiment and hardness are inclined
Low, buffer function is poor, and primary coat is caused to separate with buffer layer, and 8 buffer layer elasticity modulus of embodiment and intensity are higher, and also difficulty plays very
Good buffer function, buffer layer are separated with elastomer.When 100% tensile modulus of elasticity of buffer layer is in 2.5 ~ 5.5MPa, hardness is 45
The plane of disruption is elastomer when adhesive strength is tested when ~ 83A.Illustrate elasticity modulus and hardness in a specific range, buffer layer with
Epoxy primary coat and elastomer adhesive property are excellent, and the adhesive strength of each interlayer is greater than the cohesive force of elastomer, and joint filling will not be from mixed
Solidifying soil seam body cracking, elastomer will not fall off.Buffer layer firmly bonds together prime coat and elastomer layer, reduces bottom
Apply the risk separated with elastomer.To guarantee joint filling bonding, cushion performance more preferably, preferably 100% tensile modulus of elasticity 3 of buffer layer ~
4.5MPa, buffer layer of the hardness in 55 ~ 80A.
As can be seen from Table IV, as elasticity modulus≤0.2MPa, elastomer joint filling has resistance to well at -30 DEG C and 60 DEG C
Fatigability, without any bonding or Cohesive failure, when elasticity modulus is bigger than normal, fracture or cracking occur for elastomer joint filling.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (10)
1. a kind of joint filling structure with modified isocyanate buffer layer, it is characterised in that including coated on concrete seam body (1)
The priming coat (2) on upper edge and side, priming coat (2) surface for being located at concrete seam body (1) side are equipped with buffer layer (3), buffering
Elastomer (4) are filled between layer (3).
2. a kind of joint filling structure with modified isocyanate buffer layer described in accordance with the claim 1, it is characterised in that described
Thickness≤the 2mm of modified buffer layer (3), buffer layer (3) and priming coat (2) adhesive strength >=2.5MPa are Nian Jie with elastomer strong
Degree >=2.5MPa, 100% tensile modulus of elasticity 2.5-5.5MPa, hardness 45-83A.
3. a kind of joint filling structure with modified isocyanate buffer layer according to claim 2, it is characterised in that described
100% tensile modulus of elasticity of buffer layer (3) is between 3-4.5MPa, and hardness is between 55-80A.
4. according to a kind of construction technology of joint filling structure with modified isocyanate buffer layer described in claim 1-3,
Be characterized in that the following steps are included:
1), moisture content≤35% of test concrete seam body (1)；
2) concrete, is stitched into edge and side on body (1) and is polishing to smooth, cleaning；
3) priming coat (2), is uniformly brushed to edge and side on concrete seam body (1)；
4), after priming coat (2) drying is tack-free to surface, buffer layer (3) is coated on side priming coat in a manner of blade coating
(2) on；
5), layer (3) to be buffered it is dry to surface it is tack-free after, the cast elastomers (4) between buffer layer (3).
5. a kind of construction technology of the joint filling structure with modified isocyanate buffer layer according to claim 4, special
Sign is that the buffer layer (3) are double-component polyurethane coating, including first component and second component, and component A and component B are according to matter
Measure the ratio mixing than 1:1.5-1:2.5；
The component A includes the raw material of following mass parts: 2 20-90 parts of degree of functionality polyethers, 5-20 parts of 3 degree of functionality polyethers, plasticising
10-40 parts of agent, 1-10 parts of naphthenic oil, 10-20 parts of isocyanates；
The component B includes the raw material of following mass parts: 2 5-15 parts of degree of functionality polyethers, amine solid chain extender 4,4'- diamino
2-10 parts of base -3,3'- dichloro diphenyl methane (MOCA), amine liquid chain extender 4,4'- diamino -3,3'- diethyl-hexichol first
0-8 parts of alkane (MOEA), 50-100 parts of powder, dispersing aid 0-3 parts of coupling, 0.3-2 parts of catalyst, disappears at 50-180 parts of plasticizer
0.2-0.8 parts of infusion.
6. a kind of construction technology of the joint filling structure with modified isocyanate buffer layer according to claim 5, special
Sign is that the 2 degree of functionality polyethers includes 0-30 parts of 1000 molecular weight polyether, 0-50 parts of 2000 molecular weight polyether, 4000 molecular weight
0-90 parts of polyethers, for one or more of above-mentioned three kinds mixing；
Isocyanates is toluene di-isocyanate(TDI), methyl diphenylene diisocyanate, any one in Carbodiimide-Modified MDI
Kind or two or more mixing；
Plasticizer is that one or more of acetyl tri-n-butyl citrate, neck dibatyl phithalate, chlorinated paraffin are mixed
It closes；
The component A includes 1-10 parts of mineral oil；
The component B further include: 0-2 parts of pigment, 0-2 parts of thixotropic agent.
7. a kind of construction technology of the joint filling structure with modified isocyanate buffer layer according to claim 5, special
Sign is:
The second component powder includes 0-80 parts of talcum powder, 0-90 parts of coarse whiting；
The coupling dispersing agent is polymeric carboxylic, high molecular polymer, any one or two kinds in modified polyorganosiloxane class
Mixing.
8. a kind of construction technology of the joint filling structure with modified isocyanate buffer layer according to claim 5, special
Sign is:
The catalyst is organo-bismuth, organotin, any in liquid amines catalyst triethylenediamine, N- dionin quinoline
Two or more mixing；
The thixotropic agent is one or more kinds of mixing of organobentonite, fumed silica, rilanit special；
The defoaming agent is the mixing of one or both of polysiloxane-based, modified polyorganosiloxane class defoaming agent.
9. a kind of construction technology of the joint filling structure with modified isocyanate buffer layer according to claim 5, special
Sign is:
The component A preparation process is as follows:
2 degree of functionality polyethers, the 3 degree of functionality polyethers 330N, plasticizer, mineral oil, naphthenic oil of metering are added in a kettle, are arranged
Oily circulating temperature controls 110 ± 5 DEG C of machine temperature, and anti-matchmaker's temperature starts to vacuumize to 90 DEG C, keeps pressure 0.04-0.05MPa 30
~ 40min boosts to -0.08-0.1MPa when anti-matchmaker's temperature is raised to 105 ~ 110 DEG C, is kept for 1.5 ~ 2 hours, tests it and contain
Water rate stops vacuumizing until moisture content≤0.05%, and oily circulating temperature is arranged and controls machine temperature 60 C, anti-matchmaker's temperature is down to 65
DEG C hereinafter, isocyanates is added, heating, anti-matchmaker's temperature in 80 ± 3 DEG C of reaction 2.5-3h, when measure reaction system-NCO content
Stop reaction when reaching theoretical value, cools to 60 DEG C, 20 ± 5min of vacuum defoamation obtains component A.
10. a kind of construction technology of the joint filling structure with modified isocyanate buffer layer according to claim 5, special
Sign is:
The component B preparation process is as follows:
2 degree of functionality polyethers DL-2000D, plasticizer, MOEA, the coupling dispersing aid of metering are added in a kettle, setting oil follows
90 ± 5 DEG C of ring temperature controller temperature, anti-matchmaker's temperature 60 ± 5 DEG C of addition talcum powder, dicalcium powders, MOCA, anti-matchmaker's temperature 70 C add
Enter phthalocyanine blue, 90 DEG C start to vacuumize, and keep 30 ~ 40min of pressure -0.04 ~ -0.05MPa, and oily circulating temperature is arranged and controls machine
110 ± 5 DEG C of temperature, when anti-matchmaker's temperature is warming up to 105 ~ 110 DEG C, pressure is adjusted to -0.08 ~ -0.1MPA, holding 1.5 ~ 2 is small
When, its moisture content is tested, until moisture content≤0.05%, stops vacuumizing, temperature 60 C is set hereinafter, plus catalyst, thixotroping
Agent, defoaming agent keep pressure -0.06 ~ -0.07MPa stirring 20 ± 5min of deaeration to get the second component.
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| CN201811633446.2A CN109763422B (en) | 2018-12-29 | 2018-12-29 | Joint filling structure with modified isocyanate buffer layer and construction process thereof |
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| CN201811633446.2A CN109763422B (en) | 2018-12-29 | 2018-12-29 | Joint filling structure with modified isocyanate buffer layer and construction process thereof |
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| CN112281687A (en) * | 2020-10-20 | 2021-01-29 | 南京道润交通科技有限公司 | Steel bridge deck pavement pit defect repairing structure and repairing method |
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