阅读说明：本技术 一种环保型盾尾密封油脂及其制备方法与应用 (Environment-friendly shield tail sealing grease and preparation method and application thereof ) 是由 任彬 于 2020-12-24 设计创作，主要内容包括：本发明属于盾尾密封油脂技术领域,具体涉及一种环保型盾尾密封油脂及其制备方法与应用。本发明的环保型盾尾密封油脂,由下列重量百分比的原料组成,包括基础油10-30份,增粘剂10-25份,添加剂2-5份,纤维2-4份,固体粉料35-55份,其中所述基础油包括牛羊油、大豆油、菜籽油中的一种或多种,使得该密封油脂具有优异的生物降解性能,避免对城市地下水及土壤的污染,安全环保,可满足客户对盾尾密封油脂类环保性的要求指标,根本上解决客户需求,产生十分巨大的市场影响和经济效益。(The invention belongs to the technical field of shield tail sealing grease, and particularly relates to environment-friendly shield tail sealing grease and a preparation method and application thereof. The environment-friendly shield tail sealing grease disclosed by the invention comprises the following raw materials, by weight, 10-30 parts of base oil, 10-25 parts of tackifier, 2-5 parts of additive, 2-4 parts of fiber and 35-55 parts of solid powder, wherein the base oil comprises one or more of adeps bovis seu Bubali, soybean oil and rapeseed oil, so that the sealing grease has excellent biodegradability, avoids pollution to urban underground water and soil, is safe and environment-friendly, can meet the requirement index of a client on the environment friendliness of the shield tail sealing grease, radically solves the client demand, and generates very large market influence and economic benefit.)

1. The utility model provides an environment-friendly shield tail sealing grease which characterized in that: the composite material comprises, by weight, 10-30 parts of base oil, 10-25 parts of a tackifier, 2-5 parts of an additive, 2-4 parts of fibers and 35-55 parts of solid powder, wherein the base oil comprises one or more of adeps bovis seu Bubali, mutton fat, soybean oil and rapeseed oil.

2. The environment-friendly shield tail sealing grease of claim 1, wherein: the tackifier comprises one or more of polyisobutylene, alkyd resin and ethylene propylene rubber.

3. The environment-friendly shield tail sealing grease of claim 1, wherein: the additive is bentonite.

4. The environment-friendly shield tail sealing grease of claim 1, wherein: the fibers are synthetic fibers including one or more of lignin, polypropylene fibers, PLA fibers.

5. The environment-friendly shield tail sealing grease of claim 4, wherein: the mass ratio of the lignin to the polypropylene fiber to the PLA fiber is 1:1.5-2.0: 2.0-3.0.

6. The environment-friendly shield tail sealing grease of claim 1, wherein: the solid powder comprises one or more of anhydrous calcium carbonate and mica powder.

7. A preparation method of environment-friendly shield tail sealing grease is characterized by comprising the following steps: the method for preparing the environment-friendly shield tail sealing grease of any one of claims 1 to 6 comprises the following steps:

s1: adding the base oil into a stirring kettle, stirring, and heating to 40-60 ℃;

s2: slowly adding the additive into the stirring kettle, and continuously stirring for 3-5 min;

s3: adding tackifier into the stirring kettle at constant speed, stirring for 5-6min, and mixing thoroughly;

s4: switching a stirring mode, slowly adding the synthetic fibers into the stirring kettle, and continuously stirring for 1-2 min;

s5: and switching a stirring mode, adding the solid powder into the stirring kettle at a constant speed, and continuously stirring for 35-45min to obtain the environment-friendly shield tail sealing grease.

8. The preparation method of the environment-friendly shield tail sealing grease as claimed in claim 7, wherein the preparation method comprises the following steps: the stirring mode comprises one of a forward rotation stirring mode and a reverse rotation stirring mode.

9. The application of the environment-friendly shield tail sealing grease is characterized in that: applying the environment-friendly shield tail sealing grease of any one of claims 1-6 to the sealing of the shield tail of a shield machine in shield method tunnel construction, and performing environmental protection performance and physical and chemical performance tests; the environmental protection performance test comprises one or more of an earthworm acute toxicity test, a daphnia 21-day breeding test, a short-term toxicity test at a fish embryo-yolk sac absorption stage, a rapid biodegradation test and an inherent biodegradation test; the physical and chemical performance test comprises one or more of penetration/temperature, pumping performance and water pressure sealing performance.

10. The application of the environment-friendly shield tail sealing grease as claimed in claim 9, wherein: the earthworm acute toxicity in the environmental protection performance is as follows: 14d-LC >1000 mg/kg; 21-day daphnia breeding test: NOEC >10.0mg/L, short-term toxicity test at fish embryo-yolk sac absorption stage: NOEC >10.0 mg/L; fast biodegradation test: the degradation rate in a 10-day observation period in a 28-day test period is more than or equal to 60 percent; intrinsic biodegradation test: the degradation rate in a test period of 28 days is more than or equal to 60 percent; the penetration/25 ℃ in the physical and chemical properties is 220-240; the pumpability is 30 +/-2 s; the water pressure resistant sealing performance is no water dripping.

Technical Field

The invention belongs to the technical field of shield tail sealing grease, and particularly relates to environment-friendly shield tail sealing grease and a preparation method and application thereof.

Background

Since this century, China has vigorously developed national infrastructure projects, such as tunnels for subways, highways, railways, municipal water and sewage pipelines, hydroelectric power, and river and lake crossing, and a shield method is widely adopted in these constructions. In the shield method, in the tunneling process of a shield machine, because a gap exists between a shield shell and the outer wall of a duct piece, in order to prevent water, silt and the like outside the shield shell from entering the shield, the gap between a shield tail and the duct piece must be sealed. The sealing shield tail brush has friction with the duct piece, the shield tail device is easy to damage due to overlarge friction force, and sealing grease needs to be filled between the shield tail sealing brushes so as to reduce the friction force between the duct piece and the shield tail brush. The shield tail sealing grease is one of the most indispensable materials for shield tail sealing in shield construction.

However, in the use of the shield tail sealing grease, the grease can contact underground water and soil, and the leaked part can exist underground for a long time. With the improvement of the national environmental protection requirement, the national green and environmental protection requirements on biodegradability of the shield tail sealing grease, toxicity to fishes and planktons in water, toxicity to residues in soil and the like are also increasingly improved, for example, the Suzhou municipal department specially studies whether the shield tail grease used in the construction of the subway tunnel shield method reaches the standard in national standard detection indexes such as GB/T21809-2008 earthworm acute toxicity, GB/T21828-2008 daphnia 21-day breeding test, GB/T21807-2008 short-term toxicity test at the fish embryo-yolk sac absorption stage, GB/T21801-2008 fast biodegradation, GB/T21818-2008 inherent biodegradation and the like, and the grease produced by each grease brand in China is processed by mineral raw materials and can not be degraded once entering the nature, and has certain toxicity to soil and water, so the shield tail sealing grease which can meet the normal construction use and meet the detection requirements of environmental protection and the like on the ecological environment is urgently needed in the shield construction engineering at present and even in the future.

Disclosure of Invention

The invention provides an environment-friendly shield tail sealing grease and a preparation method and application thereof, aiming at solving the problems that the existing shield tail sealing grease is not biodegradable and is easy to generate harm to the ecological environment and the like.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows: the environment-friendly shield tail sealing grease is composed of the following raw materials, by weight, 10-30 parts of base oil, 10-25 parts of a tackifier, 2-5 parts of an additive, 2-4 parts of fibers and 35-55 parts of solid powder, wherein the base oil comprises one or more of adeps bovis seu Bubali, adeps caprae seu ovis, soybean oil and rapeseed oil.

Further, the tackifier comprises one or more of polyisobutylene, alkyd resin and ethylene propylene rubber.

Further, the additive is bentonite.

Further, the fibers are synthetic fibers comprising one or more of lignin, polypropylene fibers, PLA fibers.

Furthermore, the mass ratio of the lignin, the polypropylene fiber and the PLA fiber is 1:1.5-2.0: 2.0-3.0.

Further, the solid powder comprises one or more of anhydrous calcium carbonate and mica powder.

A preparation method of environment-friendly shield tail sealing grease comprises the following steps:

s1: adding the base oil into a stirring kettle, stirring, and heating to 40-60 ℃;

s2: slowly adding the additive into the stirring kettle, and continuously stirring for 3-5 min;

s3: adding tackifier into the stirring kettle at constant speed, stirring for 5-6min, and mixing thoroughly;

s4: switching a stirring mode, slowly adding the synthetic fibers into the stirring kettle, and continuously stirring for 1-2 min;

s5: and switching a stirring mode, adding the solid powder into the stirring kettle at a constant speed, and continuously stirring for 35-45min to obtain the environment-friendly shield tail sealing grease.

Further, the stirring mode includes one of a forward rotation stirring mode and a reverse rotation stirring mode.

The environment-friendly shield tail sealing grease is applied to sealing of a shield tail of a shield machine in shield method tunnel construction, and environmental protection performance and physical and chemical performance tests are carried out; the environmental protection performance test comprises one or more of an earthworm acute toxicity test, a daphnia 21-day breeding test, a short-term toxicity test at a fish embryo-yolk sac absorption stage, a rapid biodegradation test and an inherent biodegradation test; the physical and chemical performance test comprises one or more of penetration/temperature, pumping performance and water pressure sealing performance.

Further, the acute toxicity of earthworms in environmental protection performance: 14d-LC >1000 mg/kg; 21-day daphnia breeding test: NOEC >10.0mg/L, short-term toxicity test at fish embryo-yolk sac absorption stage: NOEC >10.0 mg/L; fast biodegradation test: the degradation rate in a 10-day observation period in a 28-day test period is more than or equal to 60 percent; intrinsic biodegradation test: the degradation rate in a test period of 28 days is more than or equal to 60 percent; the penetration/25 ℃ in the physical and chemical properties is 220-240; the pumpability is 30 +/-2 s; the water pressure resistant sealing performance is no water dripping.

The environment-friendly shield tail sealing grease disclosed by the invention is composed of the following raw materials, by weight, 10-30 parts of base oil, 10-25 parts of tackifier, 2-5 parts of additive, 2-4 parts of fiber and 35-55 parts of solid powder, wherein the base oil comprises one or more of adeps bovis seu Bubali, soybean oil and rapeseed oil, so that the sealing grease has excellent biodegradability, avoids pollution to urban underground water and soil, is safe and environment-friendly, can meet the requirement index of a client on the environment friendliness of the shield tail sealing grease, radically solves the client requirement, and generates very large market influence and economic benefit.

Drawings

Fig. 1 is a flow chart of a preparation method of the environment-friendly shield tail sealing grease.

Detailed Description

The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The environment-friendly shield tail sealing grease comprises, by weight, 10-30 parts of base oil, 10-25 parts of tackifier, 2-5 parts of additive, 2-4 parts of fiber and 35-55 parts of solid powder, wherein the base oil comprises adeps bovis seu Bubali, soybean oil, rapeseed oil and the like, so that the sealing grease has excellent biodegradability, avoids pollution to urban underground water and soil, is safe and environment-friendly, can meet the requirement index of a client on the environment-friendliness of the shield tail sealing grease, radically solves the client requirement, and generates great market influence and economic benefit.

As a preferred embodiment of the present invention, it may also have the following additional technical features: the tackifier comprises polyisobutylene, alkyd resin, ethylene propylene rubber and the like, wherein the polyisobutylene is called PB for short, is a colorless, tasteless and transparent excellent tackifier, has good tackifying effect and good low temperature resistance, is nontoxic and environment-friendly, is used in shield tail sealing grease for a high water pressure resistant shield, can improve the viscosity of the grease and ensures the sealing water pressure resistance; the alkyd resin has a group with stronger polarity and stronger charge, can react with the surface of a metal substrate to form a stronger chemical bond, and can enhance the bonding capability of fibers and grease in a product, so that the adhesion and the bonding force of shield tail sealing grease are improved; the ethylene propylene rubber is a synthetic rubber taking ethylene and propylene as main monomers, has excellent low-density high filling property, weather resistance, ozone resistance, heat resistance, acid and alkali resistance, water vapor resistance, color stability, oil filling property and normal-temperature flow, can be filled in the clearance between the holes of the steel wire brush, effectively prevents the infiltration of soil and sand, and plays a role in sealing and protecting. The tackifier is matched with each other for use, so that the bonding capability of the sealing grease is improved, and the sealing property and the water resistance of the sealing grease are improved.

In the embodiment, the additive is bentonite which is a thickening rheological agent and can be mixed with base oil to prepare a lubricant, so that the lubricating property of the sealing grease is improved, and meanwhile, the bentonite is matched with other substances to improve the waterproof effect and the adhesive capacity of the sealing grease.

In this embodiment, the fibers are synthetic fibers including one or more of lignin, polypropylene fibers, PLA fibers; the mass ratio of the lignin, the polypropylene fiber and the PLA fiber is 1:1.5-2.0:2.0-3.0, preferably 1:1.6:2.5, so that the synthetic fiber can be matched with other substances in a formula, and the waterproof effect and the adhesive capacity of the sealing grease are improved. The lignocellulose is nontoxic and environment-friendly, can be biodegraded, has a three-dimensional net structure, is particularly suitable for shield tail sealing grease for a high water pressure resistant shield as a framework component of the grease, ensures the high water pressure resistance of the shield tail sealing grease, and can improve the waterproof effect and the adhesive capacity of the sealing grease by being matched with polypropylene fibers and PLA fibers.

In the embodiment, the solid powder comprises one or more of anhydrous calcium carbonate and mica powder, has the unique advantages of small heat conductivity coefficient, flame retardance, light weight, sound absorption, insulation, high mechanical strength, no toxicity or irritation to a human body and the like, and is used in the shield tail sealing grease for the shield with high water resistance to improve the water pressure resistance and the consistency.

As shown in fig. 1, a method for preparing an environment-friendly shield tail sealing grease comprises the following steps:

s1: adding the base oil into a stirring kettle for stirring, starting forward rotation stirring, and heating to 40-60 ℃;

s2: slowly adding the additive into the stirring kettle, and continuously stirring for 3-5 min;

s3: adding tackifier into the stirring kettle at constant speed, stirring for 5-6min, and mixing thoroughly;

s4: switching to a reverse stirring mode, slowly adding the synthetic fibers into the stirring kettle, and continuously stirring for 1-2min, so that all the raw materials can be fully and uniformly mixed, and the occurrence of lumps is effectively avoided;

s5: and (3) starting a forward rotation stirring mode, adding the solid powder into the stirring kettle at a constant speed, and continuously stirring for 35-45min to obtain the environment-friendly shield tail sealing grease.

The embodiments of the present invention are described in further detail below.

Example one

600g of adeps bovis seu Bubali and adeps Caprae seu Ovis are poured into a stirring kettle at constant speed, and are started to rotate positively to stir, and are heated to 60 ℃. Then slowly pouring 60g of the treated bentonite into a stirring kettle, continuously stirring for 3-5min, then pouring 300g of polyisobutylene and 150g of alkyd resin into the stirring kettle at a constant speed, continuously stirring for 5min, fully mixing uniformly, then switching to a reverse stirring mode, slowly adding 60g of synthetic fiber into the stirring kettle, and stirring for 1-2 min; and finally, starting a forward rotation stirring mode, pouring 75g of mica powder and 1350g of calcium powder into a stirring kettle at a constant speed, and keeping stirring for 40min to obtain the environment-friendly shield tail sealing grease.

Example two

430g of rapeseed oil is poured into a stirring kettle at a constant speed, and is stirred in a forward rotation manner, and the temperature is raised to 50 ℃. Then slowly pouring 100g of the treated bentonite into a stirring kettle, continuously stirring for 3-5min, then pouring 220g of polyisobutylene and 230g of alkyd resin into the stirring kettle at a constant speed, continuously stirring for 5min, fully mixing uniformly, switching to a reverse stirring mode, slowly adding 55g of synthetic fiber into the stirring kettle, and stirring for 1-2 min; and finally, starting a forward rotation stirring mode, pouring 75g of mica powder and 1400g of calcium powder into a stirring kettle at a constant speed, and keeping stirring for 40min to obtain the environment-friendly shield tail sealing grease.

EXAMPLE III

500g of soybean oil is poured into a stirring kettle at a constant speed, and is started to rotate positively to stir, and the temperature is raised to 40 ℃. Then, slowly pouring 125g of the treated bentonite into a stirring kettle, continuously stirring for 3-5min, then pouring 100g of ethylene propylene rubber and 430g of alkyd resin into the stirring kettle at a constant speed, continuously stirring for 5min, fully mixing uniformly, switching to a reverse stirring mode, slowly adding 55g of synthetic fiber into the stirring kettle, and stirring for 1-2 min; and finally, starting a forward rotation stirring mode, pouring 75g of mica powder and 1350g of calcium powder into a stirring kettle at a constant speed, and keeping stirring for 40min to obtain the environment-friendly shield tail sealing grease.

The application of the environment-friendly shield tail sealing grease is characterized in that the environment-friendly shield tail sealing grease prepared in the embodiment 1-3 is applied to sealing of a shield tail of a shield machine in shield method tunnel construction, and environmental protection performance and physical and chemical performance are tested; wherein, the environmental protection performance test comprises an earthworm acute toxicity test, a daphnia 21-day breeding test, a short-term toxicity test at a fish embryo-yolk sac absorption stage, a rapid biodegradation test and an inherent biodegradation test; the physical and chemical performance tests comprise penetration/temperature, pumpability, hydraulic pressure resistance, and the like, and specific detection results are shown in table 1.

TABLE 1 environmental protection and physical and chemical properties data of environmental protection shield tail sealing grease

Through the detection of the indexes (as shown in table 1) of the 3 embodiments of the invention, the environment-friendly shield tail sealing grease has excellent biodegradability, avoids pollution to urban underground water and soil, is safe and environment-friendly, can meet the requirement index of a client on the environment-friendliness of the shield tail sealing grease, fundamentally solves the client requirement, and can generate great market influence and economic benefit. The environment-friendly shield tail sealing grease prepared by the invention can be applied to sealing of the shield tail of a shield machine in shield method tunnel construction by strictly controlling the control of raw material selection, process feeding sequence, stirring time, detection items and the like.

The above additional technical features can be freely combined and used in superposition by those skilled in the art without conflict.

It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes in the features and embodiments, or equivalent substitutions may be made therein by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.