CN110295024A - Cable tube sealing agent and its application method - Google Patents

Abstract

The invention discloses a kind of cable tube sealing agent and its application method, cable tube sealing agent includes two component of A, B, and component A includes: 70~80 parts of polyether diols in parts by weight；2~4 parts of chain extender；5~8 parts of crosslinking agent；1~1.5 part of organic silicon surfactant；1.5~2 parts of water and 1~1.5 part of amine catalyst for trimerization；B component is 90:(8~10 with mass ratio with polyphenyl polymethylene polyisocyanates (PAPI) by methyl diphenylene diisocyanate (MDI)) ratio mix；A, the ratio of two kinds of component proportions of B is by quality ratio are as follows: 100:(70~80).The present invention carries out segmented closure to cable tube using expansion type cable tube sealing agent, integrate waterproof, closure, antitheft, can achieve permanent seal, corrosion-resistant, protection against rodents, ant destruction multiple effect.

Description

Cable duct sealant and method of use thereof

technical field

The invention relates to the technical field of power cable installation, in particular to a cable pipe sealing agent and a method for using the same.

Background technique

As the requirements for power facilities become more and more standardized, the level requirements for the sealing of cable duct holes are also getting higher and higher. The power supply design and operation departments have clear requirements for the sealing of cable duct holes. It can be seen that it is extremely important to do a good job of sealing the cable pipe hole, which is an important guarantee for the safe operation of power supply facilities.

At present, there are many materials and structures for cable pipe hole sealing. The existing sealing materials include fireproof mud, styrofoam, rubber, cement, etc., and the sealing structures include rubber pipe sealers, pipe sealing modules, and flanged pipe seals. Plugs, inflatable pipe plugging airbags, etc. During the use of traditional plugging materials and plugging structures, there are problems such as short service life, poor environmental protection, insufficient fire resistance, smoke blocking, oil resistance, water resistance, and corrosion resistance. , can not meet the needs of the development of the power cable field.

Contents of the invention

Aiming at the deficiencies existing in the prior art, the present invention provides a cable pipe sealing agent and its application method, which adopts the expandable cable pipe sealing agent to block the cable pipe in sections, integrating waterproof, sealing and anti-theft , can achieve multiple effects of permanent sealing, corrosion resistance, rodent and ant protection.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A component comprises by weight:

Component B is formed by mixing diphenylmethane diisocyanate and polyphenylpolymethylene polyisocyanate in a mass ratio of 90: (8-10);

The ratio of the distribution ratio of the two components of A and B is calculated by mass ratio: 100: (70-80).

In order to achieve the flame retardant effect, further, the cable duct sealing agent also includes component C, which is a composite high-efficiency flame retardant; the proportion of the three components of A, B, and C is calculated by mass ratio: 100: (70~80): (25~30).

In order to further improve the flame retardant effect, it is preferred that the composite high-efficiency flame retardant is expanded graphite powder with a mesh number of 200-300.

Preferably, the dihydroxy polyether is at least one of N-210, N-220, and N-240.

Preferably, the chain extender is 3,3'-dichloro-4,4'-diaminodiphenylmethane. 3,3'-Dichloro-4,4'-diaminodiphenylmethane is an elastomer chain extender with high hydroxyl value and low viscosity.

Preferably, the crosslinking agent is polyether polyol DV-125. Crosslinking agents increase foam hardness and cure speed.

Preferably, the amine trimerization catalyst is at least one of DMP-30, DABCO TMR, and polycat 41.

A method for using a cable duct sealing agent, comprising the following steps:

S1. Prepare A and B components into W material and B material respectively, and fill W material and B material in plastic bags respectively; or prepare A into W material, and mix B and C components in proportion Finally, it is prepared into material B, and material W and material B are filled in plastic bags respectively;

S2. Put the first blocking plate ring on the cable and stuff it into the cable tube at a depth of 7-10cm;

S3. Put the second blocking plate ring on the cable and stuff it into the cable tube at a depth of 1 to 4 cm; the first blocking plate, the cable, and the second blocking plate form an injection molding space, and the second blocking plate is provided with a communication The injection port of the injection molding space;

S4. Mix W material and B material in a plastic bag according to the set ratio, knead the mixed liquid quickly for 15 to 90 seconds, and then inject the mixed liquid into the injection molding space through the cannula; wait for a few minutes, and the mixed liquid expands and solidifies. The cable duct is glued together.

Preferably, the first and second blocking boards are soft sponge boards or pearl cotton boards with a thickness of 7-9 cm.

Preferably, the volume of the mixed liquid injected into the injection molding space is 1/5-1/7 of the injection molding space.

Beneficial effects of the present invention:

1. It solves the aging problem of existing anti-blocking products and can realize permanent sealing.

2. The plugging agent of the present application is used in a small amount, and after expansion, it is bonded to the cable pipe as a whole. It has high oil resistance, water resistance, and corrosion resistance, and its cost performance is better than that of existing products.

3. The plugging agent of the present application can meet the plugging of various cable pipe holes and cable cross-sections, and has strong flexibility and wide applicability.

4. The plugging agent of this application is easy to use, strong in operability, and high in efficiency. After the plugging agent expands, coating fireproof mud or a layer of fireproof paint on the outermost layer of the cable pipe can also realize the fireproof function.

Description of drawings

FIG. 1 is a schematic diagram of the plugging structure formed when the plugging agent prepared in Example 1 of the present application is used.

Fig. 2 is a schematic diagram of mixing material W and material B when the plugging agent prepared in Example 1 of the present application is used.

Fig. 3 is a schematic diagram of kneading and mixing liquid when the plugging agent prepared in Example 1 of the present application is used.

Fig. 4 is a schematic diagram of injecting the mixed liquid into the injection molding space when the plugging agent prepared in Example 1 of the present application is used.

Fig. 5 is a schematic diagram of the plugging agent prepared in Example 1 of the present application, when the mixed liquid expands and is bonded with the cable pipe as a whole.

Detailed ways

In order to further illustrate how the present invention is implemented, the preparation of the anti-blocking agent provided by the present invention and its application method are described in detail below in conjunction with examples, but it should be pointed out that the protection scope of the present invention is not limited by these examples .

In the following examples, GB 4208-2008 standard is used for water resistance testing; GB/T 1690-2010 method is used for corrosion resistance determination of cable skin; GB/T 528-2009 method is used for mechanical strength; GB/T 528-2009 method is used for fire resistance performance. T8625-2005 standard testing.

The weak acid condition means that the anti-blocking agent obtained in the examples is soaked in 5% hydrochloric acid for 24 hours to detect its mechanical strength, which is used to determine the acid and alkali resistance of the preservative.

Weak base condition means that the anti-blocking agent obtained in the example is soaked in 5% sodium hydroxide for 24 hours to detect its mechanical strength, which is used to determine the weak alkali resistance of the preservative.

The raw materials used in the following examples are all commercially available.

Example 1

The cable duct sealing agent consists of two components, A and B, in parts by weight, and the raw materials are as follows:

A component

B component

Diphenylmethane diisocyanate (MDI) 0.507kg

Polyphenyl polymethylene polyisocyanate (PAPI) 0.045kg

Prepare A and B two components into W material and B material respectively, and its preparation method is:

(1) Preparation of material W: weigh component A in parts by weight and stir evenly in a stainless steel reaction kettle. The stirring speed is 3000~4000n/min; the stirring time is 1~2min. Fill W material in the plastic bag that is provided with discharge port and seal and preserve.

(2) Preparation of material B: weigh component B in parts by weight and stir evenly in a stainless steel reaction kettle. The stirring speed is 3000~4000n/min; the stirring time is 1~2min. Fill material B in a plastic bag with a discharge port and keep it sealed.

The using method of the cable duct sealing agent prepared in embodiment 1 is:

The first step is to prepare the plugging structure: refer to Figure 1, take a black pearl cotton board ring with a thickness of 8cm, wrap it on a cable with a diameter of 160mm and stuff it into a cable tube with an inner diameter of 200mm to a depth of 8cm, and take another one with a thickness of 8cm The black pearl cotton board ring is set on the cable and stuffed into the cable tube to a depth of 1cm; the volume of the first black pearl cotton board, cable and second black pearl cotton board is: (π·0.1 ² -π·0.08 ² ) 0.07=7.9168×10 ^-4 m ³ injection molding space, the second black pearl cotton board is provided with an injection port connecting the injection molding space;

The second step, refer to Figure 2, take out the black W material and brown B material in the packaging box, pour W material into B material, the mass ratio of W material to B material is 100:80;

The third step, refer to Figure 3, knead the mixed liquid quickly for 15-90 seconds;

The fourth step, referring to Figure 4, is to inject the mixed liquid into the injection molding space through the cannula; the volume of the injected mixed liquid is 1.13×10 ^-4 m ³ =113ml;

The fifth step, refer to Figure 5, after waiting for a few minutes, the mixed liquid expands and solidifies and bonds with the cable tube as a whole.

The physical and chemical properties of the plugging agent obtained in Test Example 1 are shown in Table 1.

Table 1 The physical and chemical properties of the plugging agent obtained in Example 1

Example 2

The cable duct sealing agent consists of two components, A and B, in parts by weight, and the raw materials are as follows:

A component

B component

Diphenylmethane diisocyanate (MDI) 0.5432kg

Polyphenylpolymethylene polyisocyanate (PAPI) 0.048kg

The method of preparation and use of the plugging agent in Example 2 is basically the same as in Example 1, except that the two components A and B are mixed together at a mass ratio of 100:70. The physical and chemical properties of the plugging agent obtained in Example 2 are shown in Table 2.

Table 2 The physical and chemical properties of the plugging agent obtained in Example 2

Example 3

The cable duct sealing agent consists of two components, A and B, in parts by weight, and the raw materials are as follows:

A component

B component

Diphenylmethane diisocyanate (MDI) 0.579kg

Polyphenylpolymethylene polyisocyanate (PAPI) 0.0514kg

The preparation and use method of the plugging agent in Example 3 are basically the same as in Example 1, except that the two components A and B are mixed together at a mass ratio of 100:75. The physical and chemical properties of the plugging agent obtained in Example 3 are shown in Table 3 below.

Table 3 Physical and chemical properties of the plugging agent obtained in Example 1

Implementation 4

The cable pipe sealing agent is composed of two components A, B, and C, in parts by weight, and the raw materials are as follows:

A component

B component

Diphenylmethane diisocyanate (MDI) 0.507kg

Polyphenylpolymethylene polyisocyanate (PAPI) 0.05635kg

C component Expanded graphite powder with a mesh number of 200 0.2kg

Prepare A and B two components into W material and B material respectively, and its preparation method is:

(1) W material: preparation and packing method are identical with embodiment 1.

(2) Material B: Weigh components B and C in parts by weight and stir them evenly in a stainless steel reactor. The stirring speed is 3000~4000n/min; the stirring time is 1~2min. Fill material B in a plastic bag with a discharge port and keep it sealed.

The using method of the cable duct sealing agent of embodiment 4 is:

The first step is to prepare the plugging structure: refer to Figure 1, take a soft sponge plate ring with a thickness of 8cm on a cable with a diameter of 160mm and stuff it into a cable tube with an inner diameter of 200mm to a depth of 8cm, and take another 8cm thick sponge The soft sponge plate is looped on the cable and inserted into the cable tube to a depth of 1cm; the volume enclosed by the first soft sponge plate, the cable and the second soft sponge plate is: (π·0.1 ² -π·0.08 ² )·0.07＝7.9168 ×10 ^-4 m ³ injection molding space, the second black pearl cotton board is provided with an injection port connected to the injection molding space;

The second step, refer to Figure 2, take out the black W material and brown B material in the packaging box, pour W material into B material, the mass ratio of A, B, and C is 100:70:25;

The third step, refer to Figure 3, knead the mixed liquid quickly for 15-90 seconds;

The fourth step, referring to Figure 4, is to inject the mixed liquid into the injection molding space through the cannula; the volume of the injected mixed liquid is 1.13×10 ^-4 m ³ =113ml;

The fifth step, refer to Figure 5, after waiting for a few minutes, the mixed liquid expands and solidifies and bonds with the cable tube as a whole.

The physical and chemical properties of the plugging agent obtained in Test Example 4 are shown in Table 4 below.

Table 4 The physical and chemical properties of the plugging agent obtained in Example 4

Implement 5

The cable pipe sealing agent is composed of two components A, B, and C, in parts by weight, and the raw materials are as follows:

A component

B component

Diphenylmethane diisocyanate (MDI) 0.579kg

Polyphenylpolymethylene polyisocyanate (PAPI) 0.0514kg

C component Expanded graphite powder with a mesh number of 300 0.2kg

The preparation and use methods of the plugging agent in Example 5 are the same as in Example 4, and the physical and chemical properties of the plugging agent obtained in Example 5 are shown in Table 5 below.

Table 5 The physical and chemical properties of the plugging agent obtained in Example 5

It can be seen from the above examples that the plugging agent prepared by the present application has excellent mechanical properties, good acid and alkali corrosion resistance and water impact resistance, and its strength retention rate can reach more than 97% in an acid and alkali environment; the sealing performance is good , The sealing index can reach more than 8 grades.

Claims (10)

1. A cable duct sealing agent, comprising two components of A and B, is characterized in that, the A component comprises in parts by weight: Component B is formed by mixing diphenylmethane diisocyanate and polyphenylpolymethylene polyisocyanate in a mass ratio of 90: (8-10); The ratio of the distribution ratio of the two components of A and B is calculated by mass ratio: 100: (70-80). 2. cable duct sealing agent as claimed in claim 1, is characterized in that, also comprises C component, and C component is composite high-efficiency flame retardant; Calculated as: 100: (70-80): (25-30). 3. The cable duct sealing agent according to claim 2, characterized in that the composite high-efficiency flame retardant is expanded graphite powder with a mesh number of 200-300. 4. The cable duct sealing agent according to claim 1 or 2, characterized in that the dihydroxy polyether is at least one of N-210, N-220, and N-240. 5. The cable duct sealing agent according to claim 1 or 2, characterized in that the chain extender is 3,3'-dichloro-4,4'-diaminodiphenylmethane. 6. The cable duct sealing agent according to claim 1 or 2, characterized in that the crosslinking agent is polyether polyol DV-125. 7. The cable duct sealing agent according to claim 1 or 2, characterized in that the amine trimerization catalyst is at least one of DMP-30, DABCO TMR, and polycat 41. 8. the using method of cable duct sealing agent as claimed in claim 1 or 2, is characterized in that, comprises the following steps: S1. Prepare A and B components into W material and B material respectively, and fill W material and B material in plastic bags respectively; or prepare A into W material, and mix B and C components in proportion Finally, it is prepared into material B, and material W and material B are filled in plastic bags respectively; S2. Put the first blocking plate ring on the cable and stuff it into the cable tube at a depth of 7-10cm; S3. Put the second blocking plate ring on the cable and stuff it into the cable tube at a depth of 1 to 4 cm; the first blocking plate, the cable, and the second blocking plate form an injection molding space, and the second blocking plate is provided with a communication The injection port of the injection molding space; S4. Mix W material and B material in a plastic bag according to the set ratio, knead the mixed liquid quickly for 15 to 90 seconds, and then inject the mixed liquid into the injection molding space through the cannula; wait for a few minutes, and the mixed liquid expands and solidifies. The cable duct is glued together. 9. The method of using the cable duct sealing agent according to claim 8, wherein the first and second sealing plates are soft sponge plates or pearl cotton plates with a thickness of 7-9 cm. 10. The method of using the cable duct sealing agent according to claim 8, characterized in that the volume of the mixed liquid injected into the injection molding space is 1/5-1/7 of the injection molding space.