阅读说明：本技术 一种低发泡强粘接弹性聚氨酯灌浆料及其制备方法 (Low-foaming strong-bonding elastic polyurethane grouting material and preparation method thereof ) 是由 魏红超 李宝 项晓睿 于 2021-02-05 设计创作，主要内容包括：本发明公开了一种低发泡强粘接弹性聚氨酯灌浆料及其制备方法。所述灌浆料的原料由限定重量份数的以下原料组成：聚醚多元醇、聚醚二元醇、异氰酸酯、増粘树脂、液体填料及溶剂,其制备方法为将聚醚多元醇与过量异氰酸酯反应,制备以异氰酸酯封端且游离量足够的聚氨酯灌浆料预聚体；再使用聚醚二元醇、増粘树脂、液体填料与剩余过量异氰酸酯反应,制备聚氨酯胶黏剂预聚体；将预聚体混合,加入溶剂得到产物。本发明的得到的灌浆料,用注浆机械注入混凝土裂缝中能够形成密闭孔状发泡的与湿面可粘接的弹性固结体,达到与裂缝侧壁实现满粘接,进而抵抗建筑形变等因素带来的裂缝的变化,实现动态防水的目的,对于解决建筑防水工程具有重要意义。(The invention discloses a low-foaming strong-bonding elastic polyurethane grouting material and a preparation method thereof. The grouting material is prepared from the following raw materials in parts by weight: polyether glycol, isocyanate, tackifying resin, liquid filler and solvent, wherein the preparation method comprises the steps of reacting the polyether glycol with excessive isocyanate to prepare a polyurethane grouting material prepolymer which is terminated by the isocyanate and has enough free amount; reacting polyether diol, tackifying resin and liquid filler with the residual excessive isocyanate to prepare a polyurethane adhesive prepolymer; and mixing the prepolymers, and adding a solvent to obtain a product. The grouting material obtained by the invention can be injected into a concrete crack by a grouting machine to form a closed porous foamed elastic consolidation body which can be bonded with a wet surface, so that full bonding with the side wall of the crack is realized, further, the change of the crack caused by factors such as building deformation is resisted, the aim of dynamic waterproofing is realized, and the grouting material has important significance for solving the waterproofing engineering of buildings.)

1. The low-foaming strong-bonding elastic polyurethane grouting material is characterized by comprising the following raw materials in parts by weight:

20-40 parts of polyether polyol

10-30 parts of polyether glycol

15-30 parts of isocyanate

2-5 parts of tackifying resin

10-15 parts of liquid filler

15-20 parts of a solvent.

2. The low-foaming strong-adhesion elastic polyurethane grouting material as claimed in claim 1, characterized in that the raw materials thereof are composed of the following components in parts by weight:

30-40 parts of polyether polyol

10-20 parts of polyether glycol

18-25 parts of isocyanate

2-5 parts of tackifying resin

10-13 parts of liquid filler

15-20 parts of a solvent.

3. The low-foaming strong-adhesion elastic polyurethane grouting material as claimed in claim 1, characterized in that the raw materials thereof are composed of the following components in parts by weight:

30-40 parts of polyether polyol

15-20 parts of polyether glycol

20-25 parts of isocyanate

2-5 parts of tackifying resin

10-15 parts of liquid filler

15-20 parts of a solvent.

4. The low foaming strong bonding elastic polyurethane grouting material of any one of claims 1 to 3, characterized in that the functionality of the polyether polyol is 3.5 to 4.5, the number average molecular weight is 6000 to 9000, and the polyether polyol is at least one or two of polyether polyol 480, polyether polyol 460, polyether polyol 4110 or polyether polyol 450.

5. The low-foaming strong-adhesion elastic polyurethane grouting material as claimed in any one of claims 1 to 3, characterized in that the number average molecular weight of the polyether diol is 1000 to 4000, and the polyether diol is at least one or two of polyether diol 210, polyether diol 220, polyether diol 230 and polyether diol 240.

6. The low foaming high adhesion elastic polyurethane grouting material of any one of claims 1 to 3, wherein the adhesion-increasing resin is at least one or two of liquid coumarone, C5 petroleum resin, terpene resin, rosin and polyisobutylene.

7. The low foaming high adhesion elastic polyurethane grouting material of any one of claims 1 to 3, characterized in that the isocyanate is at least one of toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate or polymethylene polyphenyl polyisocyanate.

8. The low foaming strong bonding elastic polyurethane grouting material as claimed in any one of claims 1 to 3, characterized in that the liquid filler is selected from at least one or two of dibutyl phthalate, dioctyl phthalate, chlorinated paraffin and water-soluble silicone oil; the solvent is at least one or two of dimethyl carbonate, xylene, butyl acetate and carbon tetrachloride.

9. A method for preparing the low-foaming strong-bonding elastic polyurethane grouting material according to any one of claims 1 to 3, which is characterized in that polyether polyol is firstly reacted with partial excessive isocyanate according to the parts to prepare a polyurethane grouting material prepolymer which is blocked by isocyanate and has enough free amount; reacting polyether diol, tackifying resin and liquid filler with the residual excessive isocyanate to prepare a polyurethane adhesive prepolymer; and adding the reacted polyurethane adhesive prepolymer into the polyurethane grouting material prepolymer, and adjusting the viscosity to a grouting degree by using a solvent to obtain the low-foaming strong-bonding elastic polyurethane grouting material.

10. The preparation method of the low-foaming strong-adhesion elastic polyurethane grouting material of claim 9, which is characterized by comprising the following steps:

1) putting polyether polyol into a reaction kettle with a vacuum reduced pressure distillation device and a stirrer, heating to 115-120 ℃, and continuously carrying out vacuum dehydration for 2 hours at the temperature, wherein the vacuum degree is required to be 0.09-0.095 MPa; then, reducing the temperature to 80 +/-5 ℃, adding excessive isocyanate under normal pressure, controlling the temperature to be 85-90 ℃ and reacting for 2.5-3 hours to obtain a polyurethane grouting material prepolymer;

2) putting polyether glycol, tackifying resin and liquid filler into a reaction kettle with a vacuum reduced pressure distillation device and a stirrer, heating to 115-120 ℃, and continuously vacuum dehydrating for 2 hours at the temperature, wherein the vacuum degree is required to be 0.09-0.095 MPa; then, reducing the temperature to 80 +/-5 ℃, adding the residual excessive isocyanate under normal pressure, controlling the temperature to be 85-90 ℃ and reacting for 2.5-3 hours to prepare a polyurethane adhesive prepolymer;

3) respectively cooling the polyurethane grouting material prepolymer and the polyurethane adhesive prepolymer to below 70 ℃, adding the polyurethane adhesive prepolymer into the polyurethane grouting material prepolymer, stirring, vacuum degassing for 15-25 min, and enabling the vacuum degree to be 0.09-0.095 MPa; and adding a solvent to adjust the viscosity to be within the grouting standard, stirring for 5-15 min, discharging and packaging to obtain the low-foaming strong-bonding elastic polyurethane grouting material.

Technical Field

The invention belongs to the technical field of building waterproof materials, relates to a material with the functions of repairing and blocking water of a building structure crack, and particularly relates to a low-foaming strong-bonding elastic polyurethane grouting material and a preparation method thereof.

Background

For water leakage caused by construction cracks, the method of crack grouting is generally adopted to stop the leakage. Polyurethane grouting materials are one of the grouting materials commonly used at present. The polyurethane grouting material is prepared by taking excessive isocyanate prepolymer prepared by reacting polymer polyol with polyisocyanate as a main body and adding other additives, and has the functions of plugging and water prevention. According to the difference of raw materials, the water-soluble polyurethane grouting material and the oil-soluble polyurethane grouting material can be divided. The two polyurethane grouting materials are different in that: the former is prepared from hydrophilic polymer polyol, and the foamed solidification body theoretically has the effect of absorbing water and expanding after leaking stoppage and meeting water; the latter is made of hydrophobic polymer polyol, and the foamed solidification body has good hydrophobic effect and higher strength.

In the process of injecting the polyurethane grouting material into the crack by the injection equipment, the slurry can quickly react with water, foam and solidify, and flow, expand and solidify under the action of mechanical injection pressure and carbon dioxide expansion pressure generated by reaction foaming to enable the slurry to enter the crack, and a leakage channel can be quickly blocked by filling a foaming solidification body, so that the aim of quickly stopping leakage and water is fulfilled.

However, in the existing construction waterproofing applications, it was found that both grouting materials had the following problems:

(1) the time for the grouting material to expand after actually reacting with water is long, namely the grouting material starts to react with water to generate carbon dioxide for foaming and expanding and still continues to expand after consolidation and plugging; in the process, great pressure is generated in the transverse vertical direction of the crack at the grouting position, and secondary damage is easily generated to the building; the extension of cracks is caused, and the complete plugging can be realized only by multiple times of grouting;

(2) the grouting material foams quickly when meeting water, has high expansion ratio, and the polyurethane prepolymer and the wet wall surface of a crack can only block leakage by extrusion expansion filling instead of full-lamination bonding due to the isolation of an interface water film, so that the effect of completely blocking water cannot be achieved;

(3) after the expansion of the foaming solidification body is terminated no matter in the water-based or oil-based grouting material, carbon dioxide generated by the reaction, a solvent in the grouting material and water coated by the rapid reaction continuously run off in the foamed continuous holes. The consolidation body is continuously shrunk after losing the support of gas, solvent and moisture, and is easy to leak again;

(4) after the grouting material solidified body is dried and shrunk, the structure is compact, the elasticity is poor, and the grouting material solidified body is difficult to adapt to deformation caused by stress and temperature of a building. The building material is easy to be damaged under the action of building stress, so that the plugging and the waterproofing are invalid.

Due to a plurality of problems of the existing polyurethane grouting material, the plugging requirement of different building structure cracks is difficult to meet. For example: in public traffic buildings such as subways and the like, the stress of the buildings is concentrated at a cracking part due to the repeated vibration of vehicles, so that secondary leakage is easily caused; in large and high-rise civil buildings, cracks are slowly deformed due to sedimentation and structural factors, and grouting materials are difficult to deal with the change of the cracks; in underground buildings such as tunnels and pipe galleries, the water pressure change in cracks is large, and grouting materials cannot cope with the erosion of water pressure on contact surfaces continuously only by filling. At present, the diversification of the building form and structure leads the grouting material to be anti-cracking and difficult to meet the current waterproof and leakage-stopping requirements by adhesion.

Therefore, the development of a plugging grouting material which can meet the building requirements is urgently needed.

Disclosure of Invention

Aiming at the problem of waterproof failure caused by the problems of high expansion, high shrinkage, high brittleness, quick foaming, poor bonding and the like of the existing polyurethane grouting material in the prior art, the invention provides the low-foaming strong-bonding elastic polyurethane grouting material, and the grouting material is injected into a concrete crack by a grouting machine to form a closed porous foaming elastic consolidation body which can be bonded with a wet surface, so that full bonding with the side wall of the crack is realized, further, the change of the crack caused by factors such as building deformation is resisted, and the aim of dynamic waterproofing is realized; the second purpose of the invention is to provide a preparation method of the low-foaming strong-bonding elastic polyurethane grouting material.

The low-foaming strong-bonding elastic polyurethane grouting material is characterized by comprising the following raw materials in parts by weight:

20-40 parts of polyether polyol

10-30 parts of polyether glycol

15-30 parts of isocyanate

2-5 parts of tackifying resin

10-15 parts of liquid filler

15-20 parts of a solvent.

Further, the raw materials preferably comprise the following components in parts by weight:

30-40 parts of polyether polyol

10-20 parts of polyether glycol

18-25 parts of isocyanate

2-5 parts of tackifying resin

10-13 parts of liquid filler

15-20 parts of a solvent.

Further, the raw materials preferably comprise the following components in parts by weight:

30-40 parts of polyether polyol

15-20 parts of polyether glycol

20-25 parts of isocyanate

2-5 parts of tackifying resin

10-15 parts of liquid filler

15-20 parts of a solvent.

Furthermore, the functionality of the polyether polyol used in the invention is 3.5-4.5, the number average molecular weight is 6000-9000, and the polyether polyol is at least one or two of polyether polyol 480, polyether polyol 460, polyether polyol 4110 and polyether polyol 450.

Further, the number average molecular weight of the polyether diol used in the invention is 1000-4000, and the polyether diol is at least one or two of polyether diol 210, polyether diol 220, polyether diol 230 and polyether diol 240.

Further, the tackifying resin used in the invention is at least one or two selected from liquid coumarone, C5 petroleum resin, terpene resin, rosin and polyisobutylene.

Further, the isocyanate used in the present invention is at least one of toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate or polymethylene polyphenyl polyisocyanate.

Further, the liquid filler used in the invention is selected from at least one or two of dibutyl phthalate, dioctyl phthalate, chlorinated paraffin and water-soluble silicone oil; the solvent is at least one or two of dimethyl carbonate, xylene, butyl acetate and carbon tetrachloride.

The invention also discloses a preparation method of the low-foaming strong-bonding elastic polyurethane grouting material, which comprises the steps of reacting polyether polyol with partial excessive isocyanate according to parts to prepare a polyurethane grouting material prepolymer which is blocked by isocyanate and has enough free amount; reacting polyether diol, tackifying resin and liquid filler with the residual excessive isocyanate to prepare a polyurethane adhesive prepolymer; and adding the reacted polyurethane adhesive prepolymer into the polyurethane grouting material prepolymer, and adjusting the viscosity to the grouting degree by using a solvent to obtain the low-foaming strong-bonding elastic polyurethane grouting material, wherein the excessive isocyanate refers to the excessive molar quantity of the isocyanate relative to the polyether glycol and the polyether glycol, namely the feeding molar ratio of the isocyanate to the polyether glycol and the polyether glycol is more than 1.

Furthermore, the preparation method of the low-foaming strong-bonding elastic polyurethane grouting material provided by the invention specifically comprises the following steps:

1) putting polyether polyol into a reaction kettle with a vacuum reduced pressure distillation device and a stirrer, heating to 115-120 ℃, and continuously carrying out vacuum dehydration for 2 hours at the temperature, wherein the vacuum degree is required to be 0.09-0.095 MPa; then, reducing the temperature to 80 +/-5 ℃, adding part of isocyanate under normal pressure, controlling the temperature to be 85-90 ℃ and reacting for 2.5-3 hours to obtain a polyurethane grouting material prepolymer;

2) putting polyether glycol, tackifying resin and liquid filler into a reaction kettle with a vacuum reduced pressure distillation device and a stirrer, heating to 115-120 ℃, and continuously vacuum dehydrating for 2 hours at the temperature, wherein the vacuum degree is required to be 0.09-0.095 MPa; then, reducing the temperature to 80 +/-5 ℃, adding the rest isocyanate under normal pressure, controlling the temperature to be 85-90 ℃ and reacting for 2.5-3 hours to prepare a polyurethane adhesive prepolymer;

3) respectively cooling the polyurethane grouting material prepolymer and the polyurethane adhesive prepolymer obtained in the step 1) and the step 2) to below 70 ℃, adding the polyurethane adhesive prepolymer into the polyurethane grouting material prepolymer, stirring, vacuum degassing for 15-25 min, and enabling the vacuum degree to be 0.09-0.095 MPa; and adding a solvent to adjust the viscosity to be within the grouting standard, stirring for 5-15 min, discharging and packaging to obtain the low-foaming strong-bonding elastic polyurethane grouting material.

By adopting the technology, compared with the prior art, the invention has the following beneficial effects:

1) the invention changes the rapid reaction foaming of the general polyurethane grouting material with a body-type structure prepolymer into a structure-added linear structure prepolymer and reduces the problem-type structure reaction end heads by changing the grouting material reaction structure and the solidification body structure, controls the reaction speed by the prepolymerization reaction process and adjusting the material proportion, and overcomes the defects of high foaming multiplying power, large foaming strength, too rapid foaming and sharp increase of the internal pressure of a grouting part;

2) the polyurethane grouting material reacts with water to be divided into two parts, namely, the multi-end polyurethane grouting material prepolymer and the free isocyanate which react quickly react with water react first to quickly expand and block leakage; then, the prepolymer and the viscosity increasing material with linear degree perform a chain-expanding reaction to improve the elasticity and provide a bonding effect under the condition that the former removes water in the grouting joint;

3) the expanded frame structure of the polyether polyol is combined with the linear structure of the dihydric alcohol to form a composite network structure, the structure is changed from the original body type structure into a structure combining the linear structure and the body type structure, the closed pore rate of a foaming body is improved, the structural flexibility is improved, and the crack width and the shear change caused by the settlement deformation, the temperature difference deformation and the structural stress change of a building are resisted; the grouting material is prevented from being internally broken and the concrete interface is prevented from being cracked due to deformation, and the polyurethane grouting material which has no damage to the structure, good bonding effect under a humid condition and good elastic effect of a consolidation body is formed;

4) the low-foaming strong-bonding elastic polyurethane grouting material disclosed by the invention is low in foaming rate when meeting water, high in bonding strength of a damp base surface of a consolidation body and good in elastic effect, and not only can prevent secondary damage of strong foaming to a building; meanwhile, the solidified body is prevented from being damaged or separated from the grouting joint under the natural shrinkage conditions of water loss, solvent volatilization and the like, and the problem of secondary leakage is effectively prevented; the low-foaming strong-bonding elastic polyurethane grouting material can also resist the crack width and shear change caused by settlement deformation, temperature difference deformation and structural stress change of a building, and prevent the internal fracture and the cracking of a concrete interface of the grouting material caused by deformation.

Detailed Description

The present invention will be further described with reference to the following examples. The scope of the invention is not limited thereto:

in the embodiment, the property test refers to a test method of national building material industry standard polyurethane grouting material JC/T2041-2010.

In the examples, the bonding strength test is carried out by referring to the 7.1A method in the national standard of the people's republic of China, namely the Experimental method for waterproof coating for buildings GB/T16777-2008.

Example 1

A low-foaming strong-bonding elastic polyurethane grouting material is prepared from the following components in parts by weight;

46035 parts of polyether polyol

22016 parts of polyether glycol

22 parts of toluene diisocyanate

Liquid coumarone 3 parts

11 parts of dibutyl phthalate

13 parts of dimethyl carbonate

The preparation method of the low-foaming strong-bonding elastic polyurethane grouting material comprises the following steps:

1) putting 35 parts of polyether polyol 460 into a reaction kettle with a vacuum reduced pressure distillation device and a stirrer, heating to 115 ℃, continuously dehydrating for 2 hours under the condition that the vacuum degree is 0.093MPa, after dehydration, reducing the temperature to 80 ℃, adding 11 parts of toluene diisocyanate under normal pressure, and reacting for 2.5 hours at 87 ℃ to obtain a polyurethane grouting material prepolymer;

2) putting 16 parts of polyether glycol 220, 3 parts of liquid coumarone and 11 parts of dibutyl phthalate into a reaction kettle with a vacuum reduced pressure distillation device and a stirrer, heating to 116 ℃, dehydrating for 2 hours under the condition that the vacuum degree is 0.092MPa, reducing the temperature to 80 ℃ after the dehydration is finished, adding 11 parts of toluene diisocyanate under normal pressure, and reacting for 2.5 hours at the temperature of 85 ℃ to obtain a polyurethane adhesive prepolymer;

3) cooling the polyurethane grouting material prepolymer obtained in the step 1) and the polyurethane adhesive prepolymer obtained in the step 2) to below 66 ℃, adding the polyurethane adhesive prepolymer into the polyurethane grouting material prepolymer, and stirring and vacuum degassing for 15min under the condition that the vacuum degree is 0.091 MPa; then adding 13 parts of dimethyl carbonate as a solvent, and stirring for 10min to obtain the low-foaming strong-adhesion elastic polyurethane grouting material which is light yellow liquid and has no pungent smell, wherein specific performance indexes are shown in table 1.

TABLE 1 Low-foaming strongly-adhesive elastomeric polyurethane grouting material Performance parameters

Example 2

A low-foaming strong-bonding elastic polyurethane grouting material is prepared from the following components in parts by weight;

48030 parts of polyether polyol

23024 parts of polyether glycol

20 parts of diphenylmethane diisocyanate

Polyisobutylene 1200 ten thousand molecular weight 4 parts

11 parts of No. 52 chlorinated paraffin

13 portions of dimethylbenzene

The preparation method of the low-foaming strong-bonding elastic polyurethane grouting material comprises the following steps:

1) 30 parts of polyether polyol 480 are put into a reaction kettle with a vacuum reduced pressure distillation device and a stirrer, the temperature is increased to 118 ℃, the vacuum degree is 0.092MPa, and the continuous vacuum dehydration is carried out for 2 hours at the temperature. After the dehydration is finished, reducing the temperature to 80 ℃, adding 10 parts of diphenylmethane diisocyanate under normal pressure, and controlling the temperature to be 90 ℃ to react for 2.5 hours to obtain a polyurethane grouting material prepolymer;

2) 24 parts of polyether 230, 4 parts of polyisobutylene with the molecular weight of 1200 and 11 parts of 52# chlorinated paraffin are put into a reaction kettle with a vacuum reduced pressure distillation device and a stirrer, the temperature is increased to 117 ℃, the vacuum degree is 0.092MPa, and the continuous vacuum dehydration is carried out for 2 hours at the temperature. After the dehydration is finished, reducing the temperature to 80 ℃, adding 10 parts of diphenylmethane diisocyanate under normal pressure, and controlling the temperature to be 90 ℃ to react for 2.5 hours to obtain a polyurethane adhesive prepolymer;

3) cooling the polyurethane grouting material prepolymer obtained in the step 1) and the polyurethane adhesive prepolymer obtained in the step 2) to 68 ℃, adding the polyurethane adhesive prepolymer into the polyurethane grouting material prepolymer, and degassing for 15min at the vacuum degree of 0.095 MPa; then adding dimethylbenzene, and stirring for 10min to obtain the low-foaming strong-bonding elastic polyurethane grouting material which is light yellow liquid, wherein specific performance indexes are shown in table 2.

Table 2 performance parameters of low foaming preemptive-jointing elastic polyurethane grouting material

Example 3

A low-foaming strong-bonding elastic polyurethane grouting material is prepared from the following components in parts by weight;

411036 parts of polyether polyol

Polyether glycol 24020 parts

Hexamethylene diisocyanate 20 parts

Liquid coumarone 3 parts

9 parts of water-soluble silicone oil

Butyl acetate 12 parts

The preparation method of the low-foaming strong-bonding elastic polyurethane grouting material comprises the following steps:

1) 36 parts of polyether polyol 4110 are put into a reaction kettle with a vacuum reduced pressure distillation device and a stirrer, the temperature is increased to 115 ℃, the vacuum degree is 0.095MPa, and continuous vacuum dehydration is carried out for 2 hours at the temperature. After the dehydration is finished, reducing the temperature to 80 ℃, adding 12 parts of hexamethylene diisocyanate under normal pressure, and controlling the temperature at 90 ℃ to react for 2.5 hours to obtain a polyurethane grouting material prepolymer;

2) 20 parts of polyether glycol 240, 3 parts of liquid coumarone and 9 parts of water-soluble silicone oil are put into a reaction kettle with a vacuum reduced pressure distillation device and a stirrer, the temperature is raised to 120 ℃, the vacuum degree is 0.095MPa, and the continuous vacuum dehydration is carried out for 2 hours at the temperature. After the dehydration is finished, reducing the temperature to 80 ℃, adding 8 parts of hexamethylene diisocyanate under normal pressure, and controlling the temperature to be 90 ℃ to react for 2.5 hours to obtain a polyurethane adhesive prepolymer;

3) cooling the polyurethane grouting material prepolymer obtained in the step 1) and the polyurethane adhesive prepolymer obtained in the step 2) to 70 ℃, adding the polyurethane adhesive prepolymer into the polyurethane grouting material prepolymer, and degassing for 15min under the vacuum degree of 0.09 MPa; then adding 13 parts of butyl acetate as a solvent, and stirring for 10min to obtain the low-foaming strong-bonding elastic polyurethane grouting material which is light yellow liquid, wherein specific performance indexes are shown in table 3.

TABLE 3 Performance parameters of Low-foaming, strongly-bonding, elastomeric polyurethane grouting materials

Example 4

A low-foaming strong-bonding elastic polyurethane grouting material is prepared from the following components in parts by weight;

46023 parts of polyether polyol

22016 parts of polyether glycol

Liquid diphenylmethane diisocyanate 10 parts

11 parts of toluene diisocyanate

16 portions of liquid coumarone

11 parts of dibutyl phthalate

13 parts of dimethyl carbonate

The preparation method of the low-foaming strong-bonding elastic polyurethane grouting material comprises the following steps:

1) putting 23 parts of polyether polyol 460 and 13 parts of liquid coumarone into a reaction kettle with a vacuum reduced pressure distillation device and a stirrer, heating to 115 ℃, continuously dehydrating for 2 hours under the condition that the vacuum degree is 0.093MPa, after dehydration, reducing the temperature to 80 ℃, adding 10 parts of liquid diphenylmethane diisocyanate under normal pressure, controlling the temperature at 90 ℃ and reacting for 2.5 hours to obtain a polyurethane grouting material prepolymer;

2) putting 16 parts of polyether glycol 220, 3 parts of liquid coumarone and 11 parts of dibutyl phthalate into a reaction kettle with a vacuum reduced pressure distillation device and a stirrer, heating to 116 ℃, dehydrating for 2 hours under the condition that the vacuum degree is 0.092MPa, reducing the temperature to 80 ℃ after the dehydration is finished, adding 11 parts of toluene diisocyanate under normal pressure, and reacting for 2.5 hours at the temperature of 85 ℃ to obtain a polyurethane adhesive prepolymer;

3) cooling the polyurethane grouting material prepolymer obtained in the step 1) and the polyurethane adhesive prepolymer obtained in the step 2) to below 66 ℃, adding the polyurethane adhesive prepolymer into the polyurethane grouting material prepolymer, and stirring and vacuum degassing for 15min under the condition that the vacuum degree is 0.091 MPa; then adding 13 parts of dimethyl carbonate as a solvent, and stirring for 10min to obtain the low-foaming strong-adhesion elastic polyurethane grouting material which is light yellow liquid and has no pungent smell, wherein specific performance indexes are shown in table 4.

TABLE 4 Low-foaming strongly-adhesive elastomeric polyurethane grouting material performance parameters

Comparative example 1

The existing preparation method of the single-component hydrophilic polyurethane grouting material is prepared by the following raw materials and mass components thereof;

polyether 505S 100 parts

51.5 parts of liquefied MDI

35 portions of octyl phthalate

Polyalkylsiloxane 1.5 parts

The preparation method of the single-component hydrophilic polyurethane grouting material comprises the following steps:

step 1: adding 100 parts of polyether 505s and 35 parts of octyl phthalate into a reaction kettle with a vacuum reduced pressure distillation device and a stirrer, and dehydrating for 2.5 hours at 100 ℃ under vacuum and negative pressure of 0.081 MPa;

step 2: cooling to 80 deg.C, adding 51.5 parts of liquefied MDI, and charging N₂Protecting, heating to 90 ℃ and reacting for 3 hours;

and step 3: cooling to 30 ℃, adding polyalkylsiloxane, and stirring for 5min to be uniform to obtain the single-component hydrophilic polyurethane grouting material, wherein specific performance indexes are shown in table 5.

TABLE 5 polyurethane grouting material performance parameters obtained in comparative example 1

From the results of the above examples and comparative examples, it is clear that the low-foaming strong-bonding elastic polyurethane grouting material of the present invention has a low foaming ratio and a high bonding strength after grouting, so that the low-foaming strong-bonding polyurethane grouting material of the present invention does not damage the building structure during grouting, and the grouting solidification body is not easily shrunk and the grouting part is not easily peeled off, and has a good waterproof effect.