CN101230244A - A kind of self-permeable concrete crack repair glue and preparation method thereof - Google Patents

Abstract

The invention discloses a self-permeable concrete crack repair adhesive and a preparation method thereof, which is characterized in that 10-50% of vinyl polyurethane and 10-60% of vinyl mono body, 10-60% of unsaturated epoxy resin, 0.1-10% of accelerator and 0.01-1% of polymerization inhibitor are mixed and stirred evenly, and then the material is discharged, which is the main component A; 60-90% of the plasticized agent, 1 to 35% of silane coupling agent and 1 to 5% of initiator are mixed and stirred evenly, and then discharged to obtain subcomponent B; before use, the main component A and subcomponent B are packaged separately. Mix the main component A and the secondary component B together according to the proportion. The invention integrates the advantages of polyurethane, epoxy resin and acrylate, and has the characteristics of low viscosity, self-permeability, fast curing, high strength, high durability and easy operation, and can be applied to crack repair of roads, dams or airports project.

Description

A kind of self-permeable concrete crack repair glue and preparation method thereof

technical field

The invention belongs to the technical field of building materials, and in particular relates to a self-permeable concrete crack repair glue for roads, dams or airports and a preparation method thereof.

Background technique

Concrete is one of the most widely used building materials in engineering construction. In actual engineering, due to the influence of the environmental conditions of the building, improper design, construction quality and other reasons, concrete cracks and other diseases are relatively common.

In the prior art, the most prominent advantage of the epoxy resin slurry mentioned in Chinese patent CN86104918A is that the viscosity of the slurry is relatively small, but its curing time is long, which usually takes several hours to several days; Shorter initial setting time to shorten construction period and improve efficiency.

Acrylic repair materials have the characteristics of low viscosity and fast curing, but have the disadvantages of large volume shrinkage, hot stickiness and cold brittleness. A fast-curing acrylic structural adhesive reported in Chinese patent CN1198460 is a two-component structural adhesive based on vinyl polyurethane and acrylic, which has the advantages of fast curing time and high bond strength, but due to its The formula needs to add a transition metal chelating agent and a substituted dihydropyridine as a reactive diluent, which is cumbersome.

Polyurethane resin grouting material is a good seam filling material. This kind of material has good cementation, good elasticity, low temperature resistance and fatigue resistance, but usually has a high viscosity and is not suitable for repairing fine seams. Chinese patent CN1247882A reports a kind of two-component polyurethane building sealant and its production process. Its two-component polyurethane is terminated with NCO, and the viscosity reaches more than 200cps, but the high viscosity is not suitable for repairing fine seams.

A kind of sealant for road cracks reported by Chinese patent CN1376756 has good adhesion and elasticity, and can be used for crack repair; but its viscosity is relatively large, and toluene is used as a solvent, which is not environmentally friendly enough.

Chinese patent CN101081933 reports a green and environment-friendly polymer emulsion inorganic powder and nano-material composite modified emulsified asphalt crack repair material, but because it is a water-emulsion type, the water volatilization speed is slow, and the repair glue cures slowly, so it is not suitable for rapid Use in repairing occasions.

Contents of the invention

The purpose of the present invention is to propose a self-permeable concrete crack repair glue and its preparation method, which has the advantages of polyurethane, acrylate and epoxy resin, and has low viscosity, self-permeability, fast curing, high strength and high durability. And it is easy to operate, it can be applied to crack repair projects of roads, dams or airports to solve the problem of cracks.

The self-permeable concrete crack repair glue of the present invention is characterized in that it is divided into two separate formulations of main component A and secondary component B before use, wherein the composition and the mass ratio in each component are as follows:

Main component A: Vinyl polyurethane 10～50%

Vinyl monomer 10～60%

  Unsaturated epoxy resin 10～60%

Accelerator 0.1～10%

Inhibitor 0.01～1%

  Subcomponent B: Plasticizer 60～90%

                                                                                        1～35%

Initiator 1~5%.

The preparation method of the above-mentioned self-permeable concrete crack repair glue of the present invention is characterized in that 10-50% vinyl polyurethane, 10-60% vinyl mono body, 10-60% unsaturated epoxy resin, 0.1-10% accelerator and 0.01-1% polymerization inhibitor are mixed and stirred evenly, and then packaged to obtain the main component A; 10-90% accelerator Plasticizer, 1-10% of silane coupling agent and 1-5% of initiator are mixed and stirred evenly, and then the material is discharged to obtain sub-component B; before use, the main component A and sub-component B are packaged separately, and used When mixing the main component A and the subcomponent B together, the mass ratio of the main component A to the subcomponent B is 50:1-10.

The vinyl monomers include acrylic acid, butyl acrylate, ethyl acrylate, propyl acrylate, methyl acrylate, methyl methacrylate, methacrylic acid, alkyl acrylates with no more than 20 carbon atoms in the alkyl group, Alkyl Methacrylate, Acrylamide, Methacrylamide, Styrene, Alpha-Alkyl Styrene, Acrylonitrile, Methacrylonitrile, Vinyl Methyl, Vinyl Ethyl, Vinyl Propyl, Vinyl Butyl, Formaldehyde hydroxyethyl acrylate, hydroxypropyl methacrylate and/or beta-hydroxypropyl acrylate.

The unsaturated epoxy resin includes unsaturated bisphenol A type epoxy resin, E type epoxy resin, furfurone epoxy resin or polybutadiene epoxy resin.

The accelerator includes hexamethylenetetramine, N,N-dimethylaniline N,N-dimethylaniline, dimethylamine or dibenzylamine.

The polymerization inhibitor includes hydroquinone, m-cresol, p-cresol or p-hydroxyanisole.

The plasticizer includes dimethyl phthalate, dibutyl phthalate or dioctyl phthalate.

The initiator includes benzoyl peroxide, potassium persulfate, ammonium persulfate, azobisisobutyronitrile, hydrogen peroxide, tert-butyl hydroperoxide, formaldehyde, ascorbic acid, sodium formaldehyde sulfoxylate, sodium metasulfite or sulfuric acid ammonium ferrous.

The most prominent advantage of the crack repair glue of the present invention is that the viscosity of the system is small, and by adjusting the proportion of the main component A and the auxiliary component B, it can be adjusted to solidify within a few minutes to tens of minutes; for shallow crack treatment , No need for pressure grouting, directly pour the mixed resin on the joint surface, and it can penetrate into the fine concrete cracks by itself, so it becomes a self-seeping crack repair glue. Many existing restoration techniques and products either have unsatisfactory effects, are complicated to prepare or use, are expensive, or cannot adapt to various changing construction situations. Compared with the elastic epoxy chemical grouting material slurry proposed by Chinese patent CN86104918A, its viscosity is small, it is gradually polymerized and solidified, and the curing time is often, which is not conducive to accelerating the construction period; and the present invention makes the unsaturated epoxy resin , acrylate and unsaturated polyurethane complete the curing reaction. Due to the characteristics of fast reaction and fast termination of free radical polymerization, the curing time only takes a few minutes to tens of minutes, which solves the problem of long curing time. Compared with the fast-curing acrylic structural adhesive proposed by Chinese patent CN1198460, although it has the advantage of fast curing time of acrylic resin, it needs to be replaced by a chelating agent of transition metal because of the need to add a transition metal chelating agent in its formula. Hydropyridine is used as active diluent, which is more complicated; the crack repair adhesive of the present invention does not need to use transition metal chelating agent and dihydropyridine as active diluent, and only uses vinyl monomer as diluent, which simplifies the raw materials and makes the preparation method simple . Compared with the two-component polyurethane building sealant proposed by Chinese patent CN1247882A, although it has the advantages of good polyurethane cementation, good elasticity, low temperature resistance, and fatigue resistance, its viscosity is as large as 200 cps or more, which is not suitable for fine joint construction. However, the crack repair glue of the present invention uses vinyl monomers to dilute vinyl polyurethane, and has a viscosity of only 10 to 50 cps during use, which solves the problem of high viscosity and is suitable for repairing small and small seams. Compared with the road crack sealant reported in Chinese patent CN1376756, because it uses toluene as a solvent, it is not environmentally friendly enough; and the present invention does not use toluene, nor benzene and xylene as organic solvents, but uses vinyl monomers for dilution. After the base monomer is cured, it becomes a high polymer and does not volatilize, which solves the problem that the glue is not environmentally friendly. Compared with the green environment-friendly polymer emulsion inorganic powder and nano-material composite modified emulsified asphalt crack repair material reported in Chinese patent CN101081933, because it completes the glue curing reaction through the volatilization of water, the water volatilization is slow, so the glue solidifies Slow, need more than 24 hours, not suitable for fast repair occasions; and the crack repair adhesive of the present invention completes the curing reaction through free radical polymerization, and the curing time only needs a few minutes to tens of minutes. In summary, the crack repair adhesive of the present invention complements the advantages and properties of the three major resins of polyurethane, acrylate and epoxy resin, and integrates advantages in one. It is especially suitable for occasions that need to achieve the purpose of rapid repair, and does not use organic solvents. An environmentally friendly crack repair glue.

Detailed ways:

Below in conjunction with specific embodiment, further illustrate the present invention.

Example 1:

Before preparing main component A, first prepare vinyl polyurethane, concrete preparation method is as follows:

Weigh 58 grams of N-210 polyoxypropylene diol and 50 grams of diphenylmethane diisocyanate after vacuum dehydration, add them into a three-necked flask, control the temperature at 60°C and react under mechanical stirring for 2 hours, then add methacrylic acid hydroxyl 34 grams of propyl ester, heated up to 90°C and reacted for 2 hours, cooled to 25°C, and discharged to obtain vinyl polyurethane.

In a 2000ml three-necked flask, successively add 100 grams of vinyl polyurethane, 500 grams of hydroxypropyl methacrylate, 500 grams of unsaturated epoxy resin, 2.2 grams of dimethylbenzylamine and 0.5 grams of hydroquinone, and stir evenly, that is Winner component A.

Mix 49 grams of dimethyl phthalate, 36 grams of benzoyl peroxide and 2 grams of silane coupling agent, and stir evenly to obtain subcomponent B.

Test methods for product performance:

Tensile strength: According to GB/T2568-1995, test with XLM-intelligent electronic tensile testing machine (Jinan Languang), and the tensile speed is 200mm/min;

Viscosity: Test the viscosity of the mixed glue with the NDJ-T9 rotational viscometer (Tongji University Electromechanical Plant);

Hardness: tested by Shore D hardness tester.

Effect:

1. When using, prepare the slurry according to the mass ratio of main component A: sub-component B = 50:1, mix well and inject into the crack. The glue starts to solidify in 5 minutes, and the glue solidifies completely after 20 minutes, and the crack repair is completed. According to the above test method, the performance of the proportioned product in this example is: curing time 20 minutes, viscosity 30cps when applied, 22°C Shore D hardness 75, and compressive strength 30MPa.

2. When using, prepare the slurry according to the mass ratio of main component A: sub-component B = 50:10, mix well and inject into the crack. The glue starts to solidify in 3 minutes, and the glue solidifies completely after 10 minutes, and the crack is repaired. According to the above test method, the performance of the proportioned product in this example is: curing time 10 minutes, viscosity 32cps when applied, 22°C Shore D hardness 76, and tensile strength 32MPa.

Example 2:

In a 2000ml three-necked flask, sequentially add 300 grams of vinyl polyurethane, 600 grams of butyl methacrylate, 100 grams of unsaturated epoxy resin, 2.2 grams of dimethylbenzylamine and 0.5 grams of hydroquinone, and stir evenly, that is, the winner Component A.

Mix 49 grams of dibutyl phthalate, 36 grams of benzoyl peroxide and 30 grams of silane coupling agent, and stir evenly to obtain subcomponent B.

The test method of product performance is the same as embodiment 1.

When using, prepare the slurry according to the mass ratio of main component A: sub-component B = 50:10, mix well and inject into the crack. The glue starts to solidify in 3 minutes, and the glue solidifies completely after 10 minutes, and the crack repair is completed. The measured properties of the proportioned product in this example are: curing time of 10 minutes, viscosity of 30 cps during application, Shore D hardness of 65 at 22° C., and compressive strength of 28 MPa.

Example 3:

In a 2000ml three-necked flask, add 100 grams of vinyl polyurethane, 200 grams of methyl methacrylate, 100 grams of butyl acrylate, 600 grams of unsaturated epoxy resin, 10 grams of dimethylbenzylamine and 1 gram of hydroquinone in sequence. , Stir evenly to get the main component A.

Mix 90 grams of dimethyl phthalate, 5 grams of azobisisobutyronitrile and 5 grams of KH550 silane coupling agent, and stir evenly to obtain subcomponent B.

Test method is the same as embodiment 1.

When using, configure the slurry according to the mass ratio of main component A: sub-component B = 50:5, mix well and pour it into the crack. The glue starts to solidify in 4 minutes, and the glue solidifies completely after 15 minutes, and the crack repair is completed. The measured properties of the proportioned product in this example are: curing time 15 minutes, viscosity 50 cps when applied, Shore D hardness 55 at 22°C, and compressive strength 38 MPa.

Example 4:

In a 2000ml three-necked flask, add 500 grams of vinyl polyurethane, 300 grams of methyl methacrylate, 100 grams of butyl acrylate, 100 grams of unsaturated epoxy resin, 0.5 grams of dimethyl benzylamine and 0.01 grams of hydroquinone in sequence. , Stir evenly to get the main component A.

Mix 90 grams of dioctyl phthalate, 5 grams of benzoyl peroxide and 5 grams of KH550 silane coupling agent, and stir evenly to obtain subcomponent B.

Test method is the same as embodiment 1.

When using it, configure the slurry according to the mass ratio of main component A: sub-component B = 50:5, mix well and pour it into the crack. The glue starts to solidify in 5 minutes, and after 30 minutes, the glue is completely cured and the crack is repaired. The measured properties of the proportioned product in this example are: curing time 30 minutes, viscosity 48 cps when applied, Shore D hardness 50 at 22°C, and compressive strength 33 MPa.

Example 5:

In a 2000ml three-necked flask, add 100 grams of vinyl polyurethane, 100 grams of hydroxypropyl methacrylate, 500 grams of methyl methacrylate, 100 grams of butyl acrylate, 100 grams of styrene, 100 grams of unsaturated epoxy resin, and two 10 grams of methylbenzylamine and 1 gram of hydroquinone were stirred evenly to obtain the main component A.

Mix 60 grams of dimethyl phthalate, 35 grams of benzoyl peroxide and 5 grams of KH550 silane coupling agent, and stir evenly to obtain subcomponent B.

Test method is the same as embodiment 1.

When using, configure the slurry according to the mass ratio of main component A: sub-component B = 50:1, mix well and pour it into the crack. The glue starts to solidify in 4 minutes, and the glue solidifies completely after 20 minutes, and the crack repair is completed. The measured properties of the proportioned product in this example are: curing time 20 minutes, viscosity 20 cps when applied, Shore D hardness 75 at 22°C, and compressive strength 39 MPa.

comparative analysis:

In the foregoing embodiment, if other conditions remain unchanged, the amount of vinyl polyurethane is changed from 10% to 50%, the amount of vinyl monomer is changed from 10% to 60%, the amount of unsaturated epoxy resin is changed from 10% to 60%, The quality of accelerator is changed from 0.1% to 10%, the amount of polymerization inhibitor is changed from 0.01% to 1%, the mass ratio of plasticizer is changed from 60% to 90%, the amount of silane coupling agent is changed from 1% to 35%, The quality of the initiator is changed from 1% to 5%, and the product with satisfactory performance can be obtained.

In the above examples, if other conditions remain unchanged, methyl methacrylate and butyl acrylate are used instead of hydroxypropyl methacrylate, or they are used in combination, and products with satisfactory performance can be obtained. This is because these monomers All of them contain double bonds, and can participate in free radical polymerization to form high polymers to obtain products. Other vinyl monomers containing double bonds can be used as raw materials of the present invention, and products with satisfactory performance can be obtained.

The initiator used in the present invention is a commonly used initiator in free radical polymerization, and is similar to benzoyl peroxide, which can provide free radicals to complete the free radical polymerization reaction.

As can be seen from the above examples, the present invention synthesizes polyurethane prepolymers and reacts with epoxy resins and acrylates to prepare a series of concrete crack repair adhesives with low viscosity, fast curing speed, and strong material strength after curing. High, high hardness, and good toughness, it is a very good environmental protection crack repair material.

Claims (8)

1. a self-seepage concrete crack repairing glue is divided into two kinds of prescriptions that separate of major constituent A and side ingredient B before it is characterized in that using, moiety wherein and in component separately shared mass ratio as follows:

Major constituent A: vinyl urethane 10～50%

Vinyl monomer 10～60%

Unsatured epoxy resin 10～60%

Promotor 0.1～10%

Stopper 0.01～1%

Side ingredient B: softening agent 60～90%

Silane coupling agent 1～35%

Initiator 1～5%.

2. the preparation method of the described self-seepage concrete crack repairing glue of claim 1, it is characterized in that by each moiety in component separately shared mass ratio with the stopper mixing and stirring of 10～50% vinyl urethane, 10～60% vinyl monomer, 10～60% unsatured epoxy resin, 0.1～10% promotor and 0.01～1% after the discharging packing, promptly get major constituent A; Discharging after softening agent with 10～90%, 1～10% silane coupling agent and 1～5% the initiator mixing and stirring promptly gets side ingredient B; Before using major constituent A and side ingredient B are packed respectively, major constituent A and side ingredient B are mixed during use again, major constituent A is 50: 1～10 with the fit quality ratio of side ingredient B.

3. self-seepage concrete crack repairing glue or its preparation method as claimed in claim 1 or 2 are characterised in that described vinyl monomer comprises vinylformic acid, butyl acrylate, ethyl propenoate, propyl acrylate, methyl acrylate, methyl methacrylate, methacrylic acid, carbonatoms is no more than 20 alkyl acrylate in the alkyl, alkyl methacrylate, acrylamide, Methacrylamide, vinylbenzene, alpha-alkyl phenylethylene, vinyl cyanide, methacrylonitrile, the ethene methyl esters, the ethene ethyl ester, the ethene propyl ester, the ethene butyl ester, hydroxyethyl methylacrylate, Rocryl 410 and/or senecioate-hydroxypropyl acrylate.

4. self-seepage concrete crack repairing glue or its preparation method as claimed in claim 1 or 2 are characterised in that described unsatured epoxy resin comprises undersaturated bisphenol A type epoxy resin, E type Resins, epoxy, epoxy furfural acetone resin or polybutadiene epoxy resin.

5. self-seepage concrete crack repairing glue or its preparation method as claimed in claim 1 or 2 are characterised in that described promotor comprises vulkacit H, N, accelerine N, accelerine, dimethylamine or dibenzylamine.

6. self-seepage concrete crack repairing glue or its preparation method as claimed in claim 1 or 2 are characterised in that described stopper comprises Resorcinol, meta-cresol, p-cresol or MEHQ.

7. self-seepage concrete crack repairing glue or its preparation method as claimed in claim 1 or 2 are characterised in that described softening agent comprises dimethyl phthalate, dibutyl phthalate or dioctyl phthalate (DOP).

8. self-seepage concrete crack repairing glue or its preparation method as claimed in claim 1 or 2 are characterised in that described initiator comprises benzoyl peroxide, Potassium Persulphate, ammonium persulphate, Diisopropyl azodicarboxylate, hydrogen peroxide, the hydrogen peroxide tert-butyl ester, formaldehyde, xitix, sodium sulfoxylate formaldehyde, sodium metabisulphite or ferrous ammonium sulphate.