Caulking compound for cement concrete roadbed joint and preparation method and application thereof

Abstract

The invention discloses a caulking compound for cement concrete roadbed joints as well as a preparation method and application of the caulking compound. Every 100 parts by weight of the caulking compound for the cement concrete roadbed joint comprises the following components in parts by weight: 30-60 parts of hydroxyl-terminated polydimethylsiloxane; 1-5 parts of dimethyl silicone oil; 30 to 50 parts of nano active calcium carbonate; 3-8 parts of a cross-linking agent; 1-3 parts of a chain extender; 0.01 to 0.05 part of a catalyst; 1-5 parts of a silane coupling agent; wherein the hydroxyl-terminated polysiloxane comprises hydroxyl-terminated polysiloxanes with the viscosity of 50,000-500,000 or a mixture of the hydroxyl-terminated polysiloxanes. The prepared caulking compound is easy to construct, the surface drying speed is high after construction, surface drying only needs 30 minutes, VOC is ultralow, and almost no odor exists. In addition, the water absorption rate of the polyurethane waterproof paint is less than 1%, and is far lower than the stipulation of 5% in the polyurethane waterproof paint standard GB / T19250-2013.

Description

Technical Field

[0001] The invention belongs to the field of glue materials, and particularly relates to a caulking glue for cement concrete roadbed joints, a preparation method and application thereof. Background Art

[0002] In recent years, with the construction of new high-speed railways and expressways in my country, the gradual improvement of infrastructure construction, and the further improvement of hardened rural roads, more and more cement facilities have been damaged due to the erosion of rainwater.

[0003] The joints of cement concrete roadbed include longitudinal construction joints, longitudinal contraction joints, transverse construction joints, transverse contraction joints, transverse expansion joints, etc. These joints are the weak links of cement concrete roadbed and are most easily damaged. The main reasons for the damage of cement concrete roadbed joints are the quality of caulking materials and the quality of caulking construction. One of the purposes of caulking is to prevent water seepage, and another purpose is to prevent mud, sand, stone chips and other debris from falling into the joints, causing the plate edges to crack when the plate expands in summer.

[0004] The traditional solution for filling the joints of cement concrete roadbed is to use asphalt or polyurethane caulking glue for filling. However, asphalt and polyurethane caulking glue are not resistant to high temperature exposure, weather aging and low temperature, and have insufficient strength and elongation. They are prone to cracking and breaking, debonding and failure. Summary of the invention

[0005] In view of this, the technical problem to be solved by the present invention is to propose a caulking glue for cement concrete roadbed joints, which can be directly constructed on the surface of the cement concrete roadbed to form a seamless waterproof layer, which is resistant to sunlight and ultraviolet aging, has good adhesion, and has a high displacement capacity.

[0006] The caulking glue for cement concrete roadbed joints of the present invention has the appearance of a paste-like sealing paste, and has the excellent properties of polyurethane and silicone, such as very high mechanical strength and good elasticity, as well as excellent hydrophobicity and weather resistance. The caulking glue adopts one or more silane products with different functionalities.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0008] A caulking adhesive for cement concrete roadbed joints, comprising the following components in parts by weight per 100 parts by weight of the caulking adhesive:

[0009] 30-60 parts of hydroxy-terminated polydimethylsiloxane;

[0010] 1-5 parts of dimethyl silicone oil;

[0011] 30-50 parts of nano-activated calcium carbonate;

[0012] 3-8 parts of cross-linking agent;

[0013] 1-3 parts of chain extender;

[0014] Catalyst 0.01-0.05 parts;

[0015] Silane coupling agent 1-5.

[0016] The terminal hydroxyl polydimethylsiloxane includes terminal hydroxyl polydimethylsiloxane with a viscosity of 50,000 to 500,000 or a mixture thereof.

[0017] The dimethyl silicone oil has a viscosity of 350cs-1000cs.

[0018] The particle size of the nano-activated calcium carbonate is nanometer-scale, and may include 60-80 nanometer-scale calcium carbonate, 80-100 nanometer-scale calcium carbonate, 100-120 nanometer-scale calcium carbonate, and may be specifically selected from at least one of Warner CCS-28 nano-activated calcium carbonate, Shitong 307 nano-activated calcium carbonate, and Yanyi CC-809 nano-activated calcium carbonate.

[0019] The chain extender is any one of dimethyl dibutyl ketone oxime silane, methyl vinyl dibutyl ketone oxime silane, dimethyl diacetone oxime silane and methyl vinyl diacetone oxime silane.

[0020] The crosslinking agent is a mixture of methyl tributylacetoximate silane and vinyl tributylacetoximate silane, with a mass ratio of 2-5:1.

[0021] The silane coupling agent includes one or more of KH-550, KH-792, KH-560, KH-540 and some oligomers.

[0022] The catalyst includes one or more of dibutyltin dilaurate, dibutyltin diacetate, and chelated tin catalyst.

[0023] The preparation method of the caulking glue for cement concrete roadbed joints of the present invention comprises the following steps:

[0024] In the first step, terminal hydroxyl polydimethylsiloxane, calcium carbonate and dimethyl silicone oil are stirred and dehydrated at high temperature and vacuum to form a base material, and the base material is cooled;

[0025] In the second step, the catalyst, silane coupling agent, cross-linking agent and chain extender are added, and the mixture is evenly mixed by vacuum stirring to obtain the slurry, which is then packaged into finished products.

[0026] The temperature of high-temperature vacuum stirring dehydration is 110-130°C.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The caulking adhesive prepared by the present invention is a single component, easy to apply, and has a fast surface drying speed after application, which takes only 30 minutes to dry (GB / T13477-2002). It has ultra-low VOC and is almost odorless. In addition, its water absorption rate is less than 1%, which is also far lower than the 5% requirement in the polyurethane waterproof coating standard GB / T19250-2013. DETAILED DESCRIPTION

[0029] In order to allow those skilled in the art to understand the present invention more clearly and intuitively, the present invention will be further described below.

[0030] Example 1

[0031] The caulking glue for cement concrete roadbed joints of the present embodiment comprises the following components in parts by weight:

[0032] Components Dosage (parts by weight) 80,000 viscosity terminal hydroxyl polydimethylsiloxane 44.45 350cs dimethyl silicone oil 3 CCS28 nano activated calcium carbonate 45 Crosslinking agent 5 Chain extender: dimethyl dibutyl ketoxime silane 1 KH-550 1 KH-560 0.5 Dibutyltin dilaurate 0.05

[0033] In this embodiment, the crosslinking agent is a mixture of methyl tributylidene oxime silane and vinyl tributylidene oxime silane, with a mass ratio of 4:1.

[0034] The preparation method of the caulking glue used for the above-mentioned cement concrete roadbed joint is as follows:

[0035] Step 1: Mix terminal hydroxyl polydimethylsiloxane, calcium carbonate and dimethyl silicone oil at 110-130℃ under vacuum stirring and dehydration to make a base material, and wait for the base material to cool to about 40℃;

[0036] Step 2: Add dibutyltin dilaurate, KH-550, KH-560, cross-linking agent, and chain extender, and mix them evenly under vacuum to obtain the slurry, and finally package them into finished products.

[0037] The prepared caulking adhesive has the following properties:

[0038]

[0039]

[0040] Example 2

[0041] The caulking glue for cement concrete roadbed joints of the present embodiment comprises the following components in parts by weight:

[0042] Components Dosage (parts by weight) 50,000 viscosity terminal hydroxyl polydimethylsiloxane 42.45 500cs dimethyl silicone oil 5 CCS28 Calcium Carbonate 45 Crosslinking agent 5 Chain extender: Methyl vinyl dibutyl ketone oxime silane 1 KH-550 1 KH-560 0.5 Dibutyltin dilaurate 0.05

[0043] In this embodiment, the crosslinking agent is a mixture of methyl tributylidene oxime silane and vinyl tributylidene oxime silane, with a mass ratio of 3:1.

[0044] The preparation method of the caulking glue for cement concrete roadbed joints in this embodiment is the same as that in Example 1.

[0045] The prepared caulking adhesive has the following properties:

[0046] performance result Dry time 30 minutes Consistency 9.5cm Tensile Strength 0.35MPa Elongation at break 880％ hardness 20Shore A Water absorption 0.85％

[0047] Example 3

[0048] The caulking glue for cement concrete roadbed joints of the present embodiment comprises the following components in parts by weight:

[0049] Components Dosage (parts by weight) 80,000 viscosity terminal hydroxyl polydimethylsiloxane 52.45 1000cs dimethyl silicone oil 5 CCS28 Calcium Carbonate 35 Crosslinking agent 5 Chain extender: dimethyl diacetone oxime silane 1 KH-550 1 KH-560 0.5 Dibutyltin dilaurate 0.05

[0050] In this embodiment, the crosslinking agent is a mixture of methyl tributylidene oxime silane and vinyl tributylidene oxime silane, with a mass ratio of 5:1.

[0051] The preparation method of the caulking glue for cement concrete roadbed joints in this embodiment is the same as that in Example 1.

[0052] The prepared caulking adhesive has the following properties:

[0053] performance result Dry time 30 minutes Consistency 9.6cm Tensile Strength 0.30MPa Elongation at break 1020％ hardness 16Shore A Water absorption 0.89％

[0054] Comparative Example 1

[0055] The caulking glue for cement concrete roadbed joints of this comparative example comprises the following components in parts by weight:

[0056] Components Dosage (parts by weight) 80,000 viscosity terminal hydroxyl polysiloxane 45.45 350cs dimethyl silicone oil 3 CCS28 Calcium Carbonate 45 Crosslinking agent 5 Chain Extender 0 KH-550 1 KH-560 0.5 Dibutyltin dilaurate 0.05

[0057] In this comparative example, the crosslinking agent is a mixture of methyl tributylidene oxime silane and vinyl tributylidene oxime silane, with a mass ratio of 4:1.

[0058] The preparation method of the caulking glue for cement concrete roadbed joints in this comparative example is the same as that in Example 1.

[0059] The prepared caulking adhesive has the following properties:

[0060] performance result Dry time 30 minutes Consistency 9.5cm Tensile Strength 0.60MPa Elongation at break 280％ hardness 30Shore A Water absorption 0.80％

[0061] Comparative Example 2

[0062] The caulking glue for cement concrete roadbed joints of this comparative example comprises the following components in parts by weight:

[0063] Components Dosage (parts by weight) 50,000 viscosity terminal hydroxyl polydimethylsiloxane 42.45 500cs dimethyl silicone oil 5 Conventional calcium carbonate particle size 2000 mesh 45 Crosslinking agent 5 Chain extender: Methyl vinyl dibutyl ketone oxime silane 1 KH-550 1 KH-560 0.5 Dibutyltin dilaurate 0.05

[0064] In this comparative example, the crosslinking agent is a mixture of methyl tributylidene oxime silane and vinyl tributylidene oxime silane, with a mass ratio of 3:1.

[0065] The preparation method of the caulking glue for cement concrete roadbed joints in this comparative example is the same as that in Example 1.

[0066] The prepared caulking adhesive has the following properties:

[0067] performance result Dry time 30 minutes Consistency 12cm Tensile Strength 0.50MPa Elongation at break 190％ hardness 40Shore A Water absorption 0.72％

[0068] It can be seen from the caulking glue prepared in the examples and comparative examples that the caulking glue of the present invention is a glue product with low modulus and high elongation at break. Changing the particle size of calcium carbonate or removing the chain extender greatly reduces the elongation at break. Therefore, the selection of calcium carbonate and the use of the chain extender are crucial to the performance of the caulking glue of the present invention.

[0069] The above description of the embodiments is to facilitate the understanding and application of the present invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the embodiments herein, and improvements and modifications made to the present invention by those skilled in the art based on the disclosure of the present invention should be within the scope of protection of the present invention.

Claims

1. A caulking adhesive for cement concrete roadbed joints, characterized in that: Every 100 parts by weight of the caulking adhesive includes the following components in parts by weight: 30-60 parts of hydroxy-terminated polydimethylsiloxane; 1-5 parts of dimethyl silicone oil; 30-50 parts of nano-activated calcium carbonate; 3-8 parts of cross-linking agent; 1-3 parts of chain extender; Catalyst 0.01-0.05 parts; Silane coupling agent 1-5; The terminal hydroxyl polydimethylsiloxane includes terminal hydroxyl polydimethylsiloxane with a viscosity of 50,000 to 500,000 or a mixture thereof.

2. The caulking adhesive for cement concrete roadbed joints according to claim 1, characterized in that: The dimethyl silicone oil has a viscosity of 350cs-1000cs.

3. The caulking adhesive for cement concrete roadbed joints according to claim 1, characterized in that: The particle size of the nano-activated calcium carbonate is nanometer-scale, and is selected from at least one of Warner CCS-28 nano-activated calcium carbonate, Shitong 307 nano-activated calcium carbonate, and Yanyi CC-809 nano-activated calcium carbonate.

4. The caulking adhesive for cement concrete roadbed joints according to claim 1, characterized in that: The chain extender is any one of dimethyl dibutyl ketone oxime silane, methyl vinyl dibutyl ketone oxime silane, dimethyl diacetone oxime silane and methyl vinyl diacetone oxime silane.

5. The caulking adhesive for cement concrete roadbed joints according to claim 1, characterized in that: The crosslinking agent is a mixture of methyl tributylacetoximate silane and vinyl tributylacetoximate silane, with a mass ratio of 2-5:

1.

6. The caulking adhesive for cement concrete roadbed joints according to claim 1, characterized in that: The silane coupling agent includes: one or more of KH-550, KH-792, KH-560, and KH-540.

7. The caulking adhesive for cement concrete roadbed joints according to claim 1, characterized in that: The catalyst includes one or more of dibutyltin dilaurate, dibutyltin diacetate, and chelated tin catalyst.

8. A method for preparing a caulking adhesive for cement concrete roadbed joints according to any one of claims 1 to 6, characterized in that: The steps include: The first step is to stir and dehydrate terminal hydroxyl polydimethylsiloxane, calcium carbonate and dimethyl silicone oil under high temperature and vacuum to make a base material, and wait for the base material to cool down; In the second step, the catalyst, silane coupling agent, cross-linking agent and chain extender are added, and the mixture is evenly mixed by vacuum stirring to obtain the slurry, which is then packaged into finished products.

9. The preparation method according to claim 7, characterized in that: The temperature of high temperature vacuum dehydration is 110-130℃.

10. Use of the caulking adhesive for cement concrete roadbed joints as claimed in any one of claims 1 to 6 in filling cement concrete roadbed joints.

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