阅读说明：本技术 一种双组份盾尾密封脂 (Double-component shield tail sealing grease ) 是由 王烨华 于 2020-10-21 设计创作，主要内容包括：本发明公开了一种双组份盾尾密封脂,包含A,B两个组分。其中A组分包含油脂10-30%,纤维5-10%,润滑剂1-5%,聚乳酸多元醇20%-40%,填料20-40%,其中B组分为聚氨酯固化剂配方。由于双组份配方的特性,可以更快的对水和泥沙进行密封,并且由于有交联部分的存在,其防水密封性能较现有产品更加优异。(The invention discloses a two-component shield tail sealing grease which comprises two components A and B. Wherein the component A comprises 10-30% of grease, 5-10% of fiber, 1-5% of lubricant, 20-40% of polylactic acid polyol and 20-40% of filler, and the component B is a polyurethane curing agent formula. Due to the characteristics of the double-component formula, water and silt can be sealed more quickly, and due to the existence of the cross-linking part, the waterproof sealing performance of the double-component waterproof sealing agent is more excellent than that of the existing product.)

1. The invention relates to a two-component shield tail sealing grease which comprises a component A and a component B, wherein the component A comprises 10-30% of grease, 5-15% of fiber, 1-5% of lubricant, 20-40% of polylactic acid polyol and 20-40% of filler, and the component B is a polyurethane curing agent formula.

2. The method as claimed in claim 1, wherein the grease used in the component A of the present invention is one or more of engine oil, epoxidized soybean oil, mineral oil and castor oil.

3. The fiber of claim 1, wherein the fiber used in the component A is one or more of acrylic fiber and polyester fiber.

4. The method according to claim 1, wherein the lubricant used in the component A of the present invention is one or more of a calcium-based grease, an aluminum-based grease, and a urea-based grease.

5. The method of claim 1, wherein the polylactic acid polyol used in the component A is polymerized by pentaerythritol ring-opening L-lactide.

6. The method as set forth in claim 5, wherein the molecular weight of the polylactic acid polyol used in the component A of the present invention is 2000-3000.

7. The method according to claim 1, wherein the filler used in the component A is one or more of calcium carbonate, barium sulfate, talcum powder, zinc oxide and magnesium oxide.

8. A process according to claim 1, wherein the polyurethane hardener formulation used in the B-component of the invention is a mineral oil solution of isocyanate trimer.

9. According to claim 8, the polyurethane curing agent used in the B component of the present invention is formulated in a mass ratio of 1:4 of isocyanate trimer to mineral oil.

10. The process according to claim 8, wherein the polyurethane curing agent used in the B-component of the present invention is a polyurethane curing agent in which the isocyanate trimer is selected from one or more of IPDI trimer, TDI trimer and HDI trimer.

11. The invention as recited in claim 1, wherein the ratio of the components A and B is 1: 0.2-1.

12. The two-component shield tail sealing grease according to claim 1, which has a high crosslinking speed, can better play a role in sealing, has better waterproof and sealing properties, and can be suitable for severe environments such as seabed and the like.

Technical Field

The invention relates to the field of sealing grease, in particular to shield tail sealing grease of a shield tunneling machine.

Background

With the high-speed development of economy in China, the country increases the investment on infrastructure, wherein subways and tunnels are one of the countries.

In subway or tunnel construction, the shield machine is being widely applied at present due to its fast construction speed and high automation degree. In the construction process of the shield machine, because the tunnel contains a large amount of silt and underground water, a gap is formed between the shield machine and the laid tunnel part, and the gap needs to be temporarily filled with shield tail sealing grease, so that the silt and the underground water can be prevented from entering the excavated tunnel.

The shield machine often meets adverse circumstances when being under construction, for example soil is too wet, and shield tail grease often will have a large amount of silt to get into the construction tunnel under the totally sealed condition yet under this condition, may influence the construction progress this moment. If the situation is severe, it is possible that the entire project may be forced to change lanes and the original location needs to be blocked, which takes a lot of effort.

Therefore, new requirements are put on the onset speed of the peltate tail grease and the sealing strength.

Disclosure of Invention

In order to solve the problems, the invention discloses a two-component shield tail sealing grease. Comprises two components A and B. Wherein the component A comprises 10-30% of grease, 5-15% of fiber, 1-5% of lubricant, 20-40% of polylactic acid polyol and 20-40% of filler, and the component B is a polyurethane curing agent formula.

As a further scheme of the invention, the grease used in the component A of the invention is one or more of engine oil, epoxidized soybean oil, mineral oil and castor oil.

In a further aspect of the present invention, the fat or oil used in the component a of the present invention is preferably a mineral oil.

As a further scheme of the invention, the fiber used in the component A of the invention is one or more of acrylic fiber and polyester fiber.

As a further aspect of the present invention, the lubricant used in the component a of the present invention is one or more of a calcium-based grease, an aluminum-based grease, and a urea-based grease.

As a further embodiment of the invention, the polylactic acid polyol used in the component A of the invention is polymerized by pentaerythritol ring opening L-lactide.

As a further aspect of the present invention, a typical synthesis process of the polylactic acid polyol used in the component A of the present invention is:

(1) 0.1mol of pentaerythritol and 2.2mol of lactide are added to the reactor, stirring is switched on and the temperature is slowly raised to 150 ℃.

(2) Adding 0.01 percent of stannous octoate, and keeping the temperature at 150 ℃ for continuous reaction.

(3) Lactide residue was checked using HPLC until the residue was less than 0.1%.

As a further embodiment of the present invention, the polylactic acid polyol used in the component A of the present invention has a molecular weight of 2000-3000. The molecular weight range is screened in a large amount, the small molecular weight can cause the sealing grease to generate too much stress, so that small gaps are generated, and the large molecular weight cannot play a good mechanical property.

As a further scheme of the invention, the filler used in the component A of the invention is one or more of calcium carbonate, barium sulfate, talcum powder, zinc oxide and magnesium oxide.

As a further variant of the invention, the polyurethane curing agent used in the component B according to the invention is formulated as a mineral oil solution of isocyanate trimer.

As a further variant of the invention, the component B of the invention uses a polyurethane hardener formulation in which the ratio of isocyanate trimer to mineral oil is 1:4 by mass.

As a further embodiment of the present invention, the polyurethane curing agent used in the component B of the present invention is formulated in which the isocyanate trimer may be one or more selected from IPDI trimer, TDI trimer and HDI trimer.

As a further scheme of the invention, the mixture ratio of the components A and B is 1: 0.2-1.

As a further scheme of the invention, the mixture ratio of the components A and B is preferably 1: 0.3-5.

As a further scheme of the invention, the formula of the components A and B of the invention needs two pipe slots, a temporary mixing section is arranged at the tail part of the shield machine, and the components A and B are extruded after mixing.

The technical scheme provided by the invention has the beneficial effects that:

by the cross-linking characteristic of the double-component formula, the shield tail sealing grease disclosed by the invention has the advantages of high effect taking speed, better waterproof sealing property and suitability for severe environment areas.

The cross-linking formula of the component A adopts a polylactic acid polyol structure, so that the cross-linking part can be slowly decomposed after the tunnel is built, and the damage to the environment is reduced.

Drawings

FIG. 1 is a graph showing the onset of action of test example 1, as a percentage of NCO groups titrated every 15 minutes after mixing of the A and B components is complete.

Detailed description of the invention

The present invention will be described in further detail with reference to examples. The raw materials used in the invention are all commercial products.

The present invention will be further described below by way of specific examples.

In the following examples, those whose operations are not subject to the conditions indicated, are carried out according to the conventional conditions or conditions recommended by the manufacturer. The raw materials except the polylactic acid polyol in the scheme of the invention are all purchased from Chinese medicines and alatin.

Example 1

The component A comprises 25g of engine oil, 12g of acrylic fiber, 3g of calcium-based lubricating grease, 30g of 3000-molecular-weight polylactic acid polyol and 30g of calcium carbonate. And the component B is 36g of IPDI trimer curing agent formula, wherein the mass ratio of IPDI to mineral oil is 1: 4.

Example 2

The component A comprises 20g of epoxidized soybean oil, 12g of polyester fiber, 4g of aluminum-based lubricating grease, 30g of 2000-molecular-weight polylactic acid polyol and 34g of talcum powder. The component B is 42g of TDI trimer curing agent formula, wherein the mass ratio of IPDI to mineral oil is 1: 4.

Example 3

The component A comprises 30g of castor oil, 5g of acrylic fiber, 5g of urea grease, 25g of 2500-molecular-weight polylactic acid polyol and 25g of barium sulfate. And the component B is an HDI trimer curing agent formula of 38g, wherein the mass ratio of IPDI to mineral oil is 1: 4.

Example 4

The component A comprises 30g of mineral oil, 7g of polyester fiber, 2g of urea grease, 21g of 3000-molecular-weight polylactic acid polyol and 40g of zinc oxide. And the component B is 25g of IPDI trimer curing agent formula, wherein the mass ratio of IPDI to mineral oil is 1: 4.

Example 5

The component A comprises 15g of mineral oil, 5g of acrylic fiber, 3g of calcium-based lubricating grease, 40g of 3000-molecular-weight polylactic acid polyol and 37g of magnesium oxide. The component B is 38g of TDI trimer curing agent formula, wherein the mass ratio of IPDI to mineral oil is 1: 4.

Example 6

The component A comprises 20g of epoxidized soybean oil, 15g of polyester fiber, 5g of aluminum-based lubricating grease, 25g of 2500-molecular-weight polylactic acid polyol and 35g of talcum powder. The component B is 27g of HDI trimer curing agent formula, wherein the mass ratio of IPDI to mineral oil is 1: 4.

Example 7

The component A comprises 10g of mineral oil, 10g of acrylic fibers, 4g of aluminum-based lubricating grease, 40g of 2000 molecular weight polylactic acid polyol and 36g of calcium carbonate. And the component B is 72g of IPDI trimer curing agent formula, wherein the mass ratio of IPDI to mineral oil is 1: 4.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

The invention relates to a two-component curing shield tail sealing grease. Thus, the onset time and the hydraulic pressure tightness were tested.

The onset of action was tested as in example 1 and the percentage of NCO groups was titrated every 15 minutes after the A and B components were mixed to obtain the curve shown in FIG. 1.

As can be seen from fig. 1, the onset of action of the present invention is very fast, with nearly 30% of the cure already at 15 minutes and the substantial cure is complete within 120 minutes.

And (3) testing the hydraulic pressure resistance sealing performance:

the shield tail sealing grease is placed in a grease cavity by using a testing method of the Zhongxie Wuzhong group, and air pressure of 3.5mpa is applied to detect whether water leakage exists. The invention additionally attempts the water leakage situation under the condition of 4.5mpa and 6mpa pressure on the basis of the air pressure of 3.5 mpa.

As can be seen from the data in the table, the two-component shield tail sealing grease of the invention is completely watertight under the pressure of 3.5mpa, and only 2 groups of examples show tiny water drops under the pressure of 6mpa at the maximum, while the commercially available product shows continuous water drops under the pressure of 6mpa, so that the two-component shield tail sealing grease of the invention has better waterproof sealing property and is a shield tail sealing grease with excellent performance.