CN108822419B

CN108822419B - Preparation method of high-performance sealing rubber strip for building

Info

Publication number: CN108822419B
Application number: CN201810716861.8A
Authority: CN
Inventors: 岳朝雷
Original assignee: Shanghai Xinke Composite Material Co Ltd
Current assignee: Kejian High Molecular Material Shanghai Co ltd
Priority date: 2018-07-03
Filing date: 2018-07-03
Publication date: 2020-10-20
Anticipated expiration: 2038-07-03
Also published as: CN108822419A

Abstract

The invention discloses a preparation method of a high-performance sealing rubber strip for a building, which relates to the technical field of building sealing rubber strips and comprises the following steps: adding the tri (butoxyethyl) phosphate, neopentyl glycol dimethacrylate, the accelerator, methylisothiazolinone and locust bean gum into a high-speed mixer in batches, and uniformly mixing to obtain a mixed material A; adding chlorosulfonated polyethylene rubber, hydrogenated nitrile rubber, crystalline 1, 2 polybutadiene resin, an anti-aging agent, sepiolite wool, palygorskite powder and a coupling agent into a rubber mixing mill, and fully mixing to obtain a mixed material B; heating, melting, extruding, molding and drying the mixture A, the mixture B and the crosslinking agent. The sealing rubber strip disclosed by the invention is simple and convenient to prepare, compact and stable in product structure, good in sealing performance, flame-retardant, high-low temperature resistant, waterproof, ageing-resistant, excellent in mechanical performance, heat-insulating, sound-insulating, insect-expelling, anti-mildew, energy-saving, environment-friendly, wide in application field and long in service life.

Description

Preparation method of high-performance sealing rubber strip for building

Technical Field

The invention relates to the technical field of building sealing rubber strips, in particular to a preparation method of a high-performance building sealing rubber strip.

Background

The door, window and curtain wall are mainly composed of aluminum alloy or steel-plastic structure, hollow glass and low-E glass or common glass, and the frame of the door, window and curtain wall is sealed with the glass, occupies a large proportion (15 percent) in the whole building energy conservation, the sealing of doors, windows and curtain walls at the present stage is mainly combined or singly used by structural glue and sealing rubber strips, which puts high requirements on the sealing performance and the aging resistance of the sealing glue and the sealing rubber strips, because the poor sealing property directly influences the energy-saving technical index of the building, and the poor aging resistance directly influences the energy-saving use cost of the building, because the service cycle of the sealing material used as a door, a window and a curtain wall is mostly required to be more than 20 years, if the aging resistance and the sealing property of the sealing material used cannot reach the service life of the door, the window and the curtain wall, the sealing material is replaced in advance, the use cost of a building is increased, and financial and material resources are wasted.

In the prior art, most of door and window curtain walls are sealed with glass, structural adhesive and rubber adhesive tapes are used, wherein the structural adhesive mostly uses silicone structural adhesive, the rubber adhesive tapes are mainly PVC adhesive tapes, EPDM adhesive tapes, EVA adhesive tapes, PE foam adhesive tapes and the like, the rubber tapes are inlaid on a frame, except for being in contact with the glass, a part of the rubber adhesive tapes are exposed in the air and emit a certain amount of harmful gas, and the silicone structural adhesive mainly plays a role in fixing.

The above prior art has the following disadvantages: 1. the rubber-plastic modified sealing strip and the PVC sealing strip have low aging resistance, are easy to embrittle and crack in a short time and sharply reduce the water tightness and air tightness after passing through sunlight and high-temperature environments, and can release harmful gases to pollute the environment. The EPDM rubber strip and other elastomer rubber strips have good elasticity, but have poor air tightness and water tightness, poor tracking performance and poor aging resistance, and a large amount of plasticizer is required to be added for keeping good elasticity, so that the EPDM rubber strip and other elastomer rubber strips are separated out after a long time, and the environment is easily polluted. 3. Although the sealing by using the silicone structural adhesive has good elasticity and bonding fastness, the appearance is not neat, the water tightness and the air tightness of the silicone structural adhesive are poor, the construction process is complex, the cost is high, and the efficiency is low. 4. Scribble the EVA adhesive tape or the cotton adhesive tape of PE bubble of pressure-sensitive adhesive, though convenient to use, clean and tidy, but only play the effect of fixed glass and frame, do not have sealed effect.

The patent application with the publication number of CN108102233A discloses a flame-retardant and aging-resistant sealing rubber strip, which is prepared from the following raw materials in parts by weight: 50-60 parts of butyl rubber, 40-50 parts of ethylene propylene diene monomer, 20-40 parts of white carbon black, 1.5-4 parts of silane coupling agent, 10-20 parts of naphthenic oil, 0.5-1 part of sulfur, 0.5-0.8 part of accelerator, 3-8 parts of active agent, 5-10 parts of lubricant, 0.5-4 parts of dicumyl peroxide (DCP), 1-2 parts of anti-aging agent, 10-20 parts of flame retardant and 1-10 parts of pigment. The sealing rubber strip has good flame retardance and aging resistance, but the mechanical property is insufficient, and the applicability is influenced.

The patent application with the publication number of CN102504727A discloses a ribbed self-adhesive glass sealing rubber strip and a manufacturing method thereof, the ribbed self-adhesive glass sealing rubber strip is composed of a built-in rubber strip ribbed and a butyl rubber sealing rubber layer coated on the surface of the rubber strip ribbed, and the butyl rubber sealing rubber layer comprises the following raw material components in parts by weight: crosslinked butyl rubber 30, ethylene propylene diene monomer 5, polyisobutylene molecular weight 4000020, polyisobutylene molecular weight 240040, amorphous alpha-olefin copolymer 20, tackifying resin 30, filler 100, silica powder 5, carbon black 10, p-benzoquinone dioxime 0.2 and lead dioxide 0.1; the method comprises the following steps: firstly, banburying and kneading butyl rubber sealing rubber, secondly coating and extruding. The sealing rubber strip has good sealing performance and elasticity, but the temperature resistance is poor, and the applicability is influenced.

Disclosure of Invention

The invention aims to provide a preparation method of a high-performance sealing rubber strip for a building, which is compact and stable and has excellent comprehensive performance.

In order to achieve the purpose, the invention is realized by the following technical scheme:

a preparation method of a high-performance sealing rubber strip for a building comprises the following steps:

step 1: adding the tributoxyethyl phosphate, neopentyl glycol dimethacrylate and the accelerator into a high-speed mixer, mixing and stirring for 3-5min under the conditions that the temperature is 45-55 ℃ and the mixing speed is 1500r/min, then heating to 60-70 ℃, adding methylisothiazolinone and locust bean gum into the high-speed mixer, and fully mixing and stirring to obtain a mixed material A;

step 2: adding chlorosulfonated polyethylene rubber and hydrogenated nitrile rubber into a rubber mixing mill, adding tall oil accounting for 4-6% of the weight of the materials, plasticating for 2-4min at the temperature of 80-100 ℃, heating to 120-;

and step 3: conveying the prepared mixture A, the prepared mixture B and the crosslinking agent to a screw extruder for heating and melting, then extruding the mixture into a die for cooling, forming and drying, wherein the screw rotating speed of the screw extruder is 34-38r/min, and the screw temperature is 85-95 ℃.

Further, the preparation method of the sealing rubber strip comprises the following steps:

step 1: adding the tributoxyethyl phosphate, neopentyl glycol dimethacrylate and the accelerator into a high-speed mixer, mixing and stirring for 3.5-4.5min under the conditions that the temperature is 48-52 ℃ and the mixing speed is 1200-1400r/min, then heating to 62-68 ℃, adding methylisothiazolinone and locust bean gum into the high-speed mixer, and fully mixing and stirring to obtain a mixed material A;

step 2: adding chlorosulfonated polyethylene rubber and hydrogenated nitrile rubber into a rubber mixing mill, adding tall oil accounting for 4.5-5.5% of the weight of the materials, plasticating at 85-95 ℃ for 2.5-3.5min, heating to 123-128 ℃, adding crystalline 1, 2 polybutadiene resin and an anti-aging agent, mixing for 3.5-4.5min, heating to 152-158 ℃, adding sepiolite wool, palygorskite powder and a coupling agent, and mixing for 6.5-7.5min to obtain a mixed material B;

and step 3: conveying the prepared mixture A, the prepared mixture B and the crosslinking agent to a screw extruder for heating and melting, then extruding the mixture into a die for cooling, forming and drying, wherein the screw rotating speed of the screw extruder is 35-37r/min, and the screw temperature is 86-92 ℃.

Further, the preparation method of the sealing rubber strip is carried out according to the following steps:

step 1: adding the tributoxyethyl phosphate, the neopentyl glycol dimethacrylate and the accelerator into a high-speed mixer, mixing and stirring for 4min under the conditions that the temperature is 50 ℃ and the mixing speed is 1300r/min, then heating to 65 ℃, adding the methylisothiazolinone and the locust bean gum into the high-speed mixer, and fully mixing and stirring to obtain a mixed material A;

step 2: adding chlorosulfonated polyethylene rubber and hydrogenated nitrile rubber into a rubber mixing mill, adding tall oil which accounts for 5 percent of the weight of the materials, plasticating for 3min at the temperature of 90 ℃, heating to 125 ℃, adding crystalline 1, 2 polybutadiene resin and an anti-aging agent, mixing for 4min, heating to 155 ℃ again, adding sepiolite wool, palygorskite powder and a coupling agent, and mixing for 7min to obtain a mixed material B;

and step 3: conveying the prepared mixture A, the prepared mixture B and the crosslinking agent to a screw extruder for heating and melting, then extruding the mixture into a die for cooling, forming and drying, wherein the screw rotating speed of the screw extruder is 36r/min, and the screw temperature is 90 ℃.

Further, the sealing rubber strip is composed of the following raw materials in parts by weight:

61 parts of chlorosulfonated polyethylene rubber;

30 parts of hydrogenated nitrile rubber;

15 parts of crystalline 1, 2 polybutadiene resin;

4 parts of methylisothiazolinone;

6 parts of tributoxyethyl phosphate;

7 parts of neopentyl glycol dimethacrylate;

10 parts of locust bean gum;

2.7 parts of sepiolite wool;

13 parts of palygorskite powder;

3.3 parts of a crosslinking agent;

0.8 part of a coupling agent;

accelerator 1.3 parts

1.5 parts of anti-aging agent.

Further, the molecular weight of the crystalline 1, 2 polybutadiene resin was 90000, and the amount of crystallizable substances was 24%.

Furthermore, the cross-linking agent is obtained by combining three components of triallyl isocyanurate, divinyl benzene and bis (2-ethylhexyl) peroxydicarbonate according to the mass ratio of (3.5-4.5) to (2.2-2.7) to (1.4-1.6).

Furthermore, the crosslinking agent is obtained by combining triallyl isocyanurate, divinylbenzene and bis (2-ethylhexyl) peroxydicarbonate according to a mass ratio of 4:2.4: 1.5.

Further, the coupling agent is obtained by combining gamma-aminopropyltriethoxysilane and titanate coupling agent 201 according to the mass ratio of 2.5: 1.4.

Further, the accelerator is obtained by combining an accelerator DM and an accelerator DCP according to the mass ratio of 3.4: 1.6.

Furthermore, the anti-aging agent is obtained by combining an anti-aging agent AW, an anti-aging agent CPPD and an anti-aging agent RD according to the mass ratio of 2.5:1.4: 3.6.

The invention has the following beneficial effects: the sealing rubber strip for the building forms a compact and stable three-dimensional reticular polymer framework through the ingenious selection of production raw materials and the creative improvement of a preparation process thereof, and the synergistic interaction of the chlorosulfonated polyethylene rubber, the hydrogenated nitrile rubber, the crystalline 1, 2 polybutadiene resin and other components in the raw materials, and has the following characteristics:

(1) the manufacturability; the energy-saving and environment-friendly composite material is energy-saving and environment-friendly, no irritant gas is generated in the using process, no pollution contour or mark is left on the section bar or glass, the raw material compatibility is good, and the production efficiency is high;

(2) functionality: the heat preservation and sound insulation performance is good, the insect and fungus expelling performance is good, the insulation and static electricity resistance are good, the vibration reduction effect is good, and the functionality is strong;

(3) mechanical properties: the prepared sealing rubber strip product has excellent elasticity, high tensile strength, large elongation at break, small hardness change fluctuation and compression deformation resistance, and the prepared sealing rubber strip product has good tensile recovery;

(4) other properties: the flame retardant has high flame retardant grade, good temperature resistance, ozone aging resistance, good sealing property, water resistance, permeability resistance, long service life and difficult cracking and shrinkage deformation.

Detailed Description

The following examples are provided to more clearly illustrate the technical solutions of the present invention, and should not be construed as limiting the scope of the present invention.

All the raw materials and the preparation components thereof in the embodiment can be obtained through a public commercial channel;

example 1

The embodiment relates to a high-performance sealing rubber strip for buildings and a preparation method thereof, wherein the sealing rubber strip is prepared from the following raw materials in parts by weight:

58 parts of chlorosulfonated polyethylene rubber;

25 parts of hydrogenated nitrile rubber;

12 parts of crystalline 1, 2 polybutadiene resin;

3 parts of methylisothiazolinone;

4 parts of tributoxyethyl phosphate;

5 parts of neopentyl glycol dimethacrylate;

8 parts of locust bean gum;

2 parts of sepiolite wool;

10 parts of palygorskite powder;

2.5 parts of a crosslinking agent;

0.6 part of a coupling agent;

1 part of an accelerator;

1 part of anti-aging agent.

The selection of the cross-linking agent, the coupling agent, the accelerator and the anti-aging agent in the raw materials is shown in the following table 1:

TABLE 1

The preparation method of the sealing rubber strip is mainly carried out according to the following steps:

step 1: adding the tributoxyethyl phosphate, the neopentyl glycol dimethacrylate and the accelerator into a high-speed mixer, mixing and stirring for 5min under the conditions that the temperature is 45 ℃ and the mixing speed is 1000r/min, then heating to 60 ℃, adding the methylisothiazolinone and the locust bean gum into the high-speed mixer, and fully mixing and stirring to obtain a mixed material A;

step 2: adding chlorosulfonated polyethylene rubber and hydrogenated nitrile rubber into a rubber mixing mill, adding tall oil accounting for 4 percent of the weight of the materials, plasticating for 4min at the temperature of 80 ℃, heating to 120 ℃, adding crystalline 1, 2 polybutadiene resin and an anti-aging agent, mixing for 5min, heating to 150 ℃ again, adding sepiolite wool, palygorskite powder and a coupling agent, and mixing for 8min to obtain a mixed material B;

and step 3: conveying the prepared mixture A, the prepared mixture B and the crosslinking agent to a screw extruder for heating and melting, then extruding the mixture into a die for cooling, forming and drying, wherein the screw rotating speed of the screw extruder is 34r/min, and the screw temperature is 85 ℃.

Example 2

60 parts of chlorosulfonated polyethylene rubber;

28 parts of hydrogenated nitrile rubber;

14 parts of crystalline 1, 2 polybutadiene resin;

3.5 parts of methylisothiazolinone;

5 parts of tributoxyethyl phosphate;

6 parts of neopentyl glycol dimethacrylate;

9 parts of locust bean gum;

2.4 parts of sepiolite wool;

12 parts of palygorskite powder;

3 parts of a crosslinking agent;

0.7 part of a coupling agent;

1.2 parts of an accelerator;

1.4 parts of anti-aging agent.

The selection of the cross-linking agent, the coupling agent, the accelerator and the anti-aging agent in the raw materials is shown in the following table 2:

TABLE 2

step 1: adding the tributoxyethyl phosphate, neopentyl glycol dimethacrylate and the accelerator into a high-speed mixer, mixing and stirring for 4.5min under the conditions that the temperature is 48 ℃ and the mixing speed is 1200r/min, then heating to 62 ℃, adding methylisothiazolinone and locust bean gum into the high-speed mixer, and fully mixing and stirring to obtain a mixed material A;

step 2: adding chlorosulfonated polyethylene rubber and hydrogenated nitrile rubber into a rubber mixing mill, adding tall oil accounting for 4.5 percent of the weight of the materials, plasticating for 3.5min at the temperature of 85 ℃, heating to 123 ℃, adding crystalline 1, 2 polybutadiene resin and an anti-aging agent, mixing for 4.5min, then heating to 152 ℃ again, adding sepiolite wool, palygorskite powder and a coupling agent, and mixing for 7.5min to obtain a mixed material B;

and step 3: conveying the prepared mixture A, the prepared mixture B and the crosslinking agent to a screw extruder for heating and melting, then extruding the mixture into a die for cooling, forming and drying, wherein the screw rotating speed of the screw extruder is 35r/min, and the screw temperature is 86 ℃.

Example 3

61 parts of chlorosulfonated polyethylene rubber;

30 parts of hydrogenated nitrile rubber;

15 parts of crystalline 1, 2 polybutadiene resin;

4 parts of methylisothiazolinone;

6 parts of tributoxyethyl phosphate;

7 parts of neopentyl glycol dimethacrylate;

10 parts of locust bean gum;

2.7 parts of sepiolite wool;

13 parts of palygorskite powder;

3.3 parts of a crosslinking agent;

0.8 part of a coupling agent;

accelerator 1.3 parts

1.5 parts of anti-aging agent.

The selection of the cross-linking agent, the coupling agent, the accelerator and the anti-aging agent in the raw materials is shown in the following table 3:

TABLE 3

Example 4

62 parts of chlorosulfonated polyethylene rubber;

32 parts of hydrogenated nitrile rubber;

16 parts of crystalline 1, 2 polybutadiene resin;

4.5 parts of methylisothiazolinone;

7 parts of tributoxyethyl phosphate;

8 parts of neopentyl glycol dimethacrylate;

11 parts of locust bean gum;

3.0 parts of sepiolite wool;

14 parts of palygorskite powder;

3.6 parts of a crosslinking agent;

0.9 part of a coupling agent;

1.4 parts of an accelerator;

1.6 parts of anti-aging agent.

The selection of the cross-linking agent, the coupling agent, the accelerator and the anti-aging agent in the raw materials is shown in the following table 4:

TABLE 4

step 1: adding the tributoxyethyl phosphate, neopentyl glycol dimethacrylate and the accelerator into a high-speed mixer, mixing and stirring for 3.5min under the conditions that the temperature is 52 ℃ and the mixing speed is 1400r/min, then heating to 68 ℃, adding methylisothiazolinone and locust bean gum into the high-speed mixer, and fully mixing and stirring to obtain a mixed material A;

step 2: adding chlorosulfonated polyethylene rubber and hydrogenated nitrile rubber into a rubber mixing mill, adding tall oil which accounts for 5.5 percent of the weight of the materials, plasticating for 2.5min at the temperature of 95 ℃, heating to 128 ℃, adding crystalline 1, 2 polybutadiene resin and an anti-aging agent, mixing for 3.5min, then heating to 158 ℃ again, adding sepiolite wool, palygorskite powder and a coupling agent, and mixing for 6.5min to obtain a mixed material B;

and step 3: conveying the prepared mixture A, the prepared mixture B and the crosslinking agent to a screw extruder for heating and melting, then extruding the mixture into a die for cooling, forming and drying, wherein the screw rotating speed of the screw extruder is 37r/min, and the screw temperature is 92 ℃.

Example 5

64 parts of chlorosulfonated polyethylene rubber;

35 parts of hydrogenated nitrile rubber;

18 parts of crystalline 1, 2 polybutadiene resin;

5 parts of methylisothiazolinone;

8 parts of tributoxyethyl phosphate;

10 parts of neopentyl glycol dimethacrylate;

12 parts of locust bean gum;

3.5 parts of sepiolite wool;

16 parts of palygorskite powder;

4 parts of a crosslinking agent;

1 part of a coupling agent;

1.5 parts of an accelerator;

and 2 parts of an anti-aging agent.

The selection of the cross-linking agent, the coupling agent, the accelerator and the anti-aging agent in the raw materials is shown in the following table 5:

TABLE 5

step 1: adding the tributoxyethyl phosphate, the neopentyl glycol dimethacrylate and the accelerator into a high-speed mixer, mixing and stirring for 3min at the temperature of 55 ℃ and the mixing speed of 1500r/min, heating to 70 ℃, adding the methylisothiazolinone and the locust bean gum into the high-speed mixer, and fully mixing and stirring to obtain a mixed material A;

step 2: adding chlorosulfonated polyethylene rubber and hydrogenated nitrile rubber into a rubber mixing mill, adding tall oil accounting for 6 percent of the weight of the materials, plasticating for 2min at the temperature of 100 ℃, heating to 130 ℃, adding crystalline 1, 2 polybutadiene resin and an anti-aging agent, mixing for 3min, heating to 160 ℃ again, adding sepiolite wool, palygorskite powder and a coupling agent, and pressurizing to mix for 6min to obtain a mixed material B;

and step 3: conveying the prepared mixture A, the prepared mixture B and the crosslinking agent to a screw extruder for heating and melting, then extruding the mixture into a die for cooling, forming and drying, wherein the screw rotating speed of the screw extruder is 38r/min, and the screw temperature is 95 ℃.

Comparative example 1

The comparative example relates to a sealing rubber strip, compared with the example 1, two base materials of chlorosulfonated polyethylene rubber and hydrogenated nitrile rubber are replaced by chloroprene rubber, and other raw materials, content and preparation method of the sealing rubber strip are the same as those in the example 1.

Comparative example 2

The comparative example relates to a sealing rubber strip, compared with the example 2, only the components of the cross-linking agent are different, and other raw materials, the content and the preparation method of the sealing rubber strip are the same as those of the example 2;

the cross-linking agent in this comparative example had the following composition: bis (2-ethylhexyl) peroxydicarbonate.

Comparative example 3

The comparative example relates to a sealing rubber strip, compared with the example 3, only the components of the coupling agent are different, and other raw materials, the content and the preparation method of the sealing rubber strip are the same as those of the example 3;

the coupling agent in this comparative example had the following composition: gamma-aminopropyltriethoxysilane.

Comparative example 4

The comparative example relates to a sealing rubber strip, compared with the example 4, only the accelerator component is different, and other raw materials, the content and the preparation method of the sealing rubber strip are the same as those of the example 4;

the accelerator in this comparative example had the following composition: and (3) an accelerator DM.

Comparative example 5

The comparative example relates to a sealing rubber strip, compared with the example 5, only the anti-aging agent component is different, and other raw materials, the content and the preparation method of the sealing rubber strip are the same as those of the example 5;

the components of the anti-aging agent in the comparative example are: aging inhibitor AW and aging inhibitor RD, the mass ratio is 2: 1.

Comparative example 6

The comparative example relates to a joint strip, which is prepared by a preparation method different from that of example 5, and has the same raw material components and content as those of example 5:

the preparation method of the joint strip of the comparative example is as follows:

adding all the raw materials except the cross-linking agent into a rubber mixing mill, adding tall oil which is 2 percent of the weight of the materials in the rubber mixing mill, gradually heating and raising the temperature until the temperature reaches 150 ℃, mixing for 8min, conveying the mixed raw materials and the cross-linking agent into a screw extruder, heating and melting, extruding into a die, cooling, molding and drying, wherein the rotating speed of a screw of the screw extruder is 30r/min, and the temperature of the screw is 80 ℃.

Comparative example 7

The comparative example relates to a common sealing rubber strip sold in the market, which is prepared from the following raw materials in parts by weight: 50 parts of butyl rubber, 40 parts of ethylene propylene diene monomer, 1.5 parts of dicumyl peroxide, 20 parts of white carbon black, KH5501.5 parts of silane coupling agent, 10 parts of paraffin, 1.5 parts of sulfur, 0.6 part of accelerator DM, 1.5 parts of anti-aging agent RD and 12 parts of flame retardant.

Performance detection

In order to verify the beneficial effects of the invention, the sealing rubber strips of the above examples 1-5 and comparative examples 1-7 (both are D-type 9mm × 7.5mm), the sealing rubber strips of the examples 1-5 are respectively and correspondingly named as #1- #5, and the sealing rubber strips of the comparative examples 1-7 are respectively and correspondingly named as #6- #12, and the performance indexes of the following tables 6 and 7 are detected, wherein the detection standard refers to "sealing rubber strips for building doors and windows and curtain walls GB/T24498-2009":

TABLE 6

TABLE 6

The combination of table 6 and table 7 above gives:

compared with the national standard requirement: the sealing rubber strip of the invention improves the tensile strength by 124.0 to 142.0 percent, improves the elongation at break by 70.0 to 76.8 percent, reduces the compression permanent deformation by 61.4 to 66.3 percent, reduces the change rate of the tensile strength by 71.2 to 75.2 percent and reduces the change rate of the elongation at break by 69.0 to 73.3 percent;

the comparison ratio is as follows: the sealing rubber strip of the invention improves the tensile strength by 6.7 to 92.1 percent, improves the elongation at break by 9.8 to 36.4 percent, reduces the compression permanent deformation by 26.6 to 58.3 percent, reduces the change rate of the tensile strength by 37.9 to 70.2 percent and reduces the change rate of the elongation at break by 29.1 to 67.6 percent;

and the method has comprehensive and obvious improvement on other physical properties, temperature resistance, ozone resistance, aging resistance and the like, and has obvious progress compared with the prior art, and the technical scheme has no obvious property.

In combination with the beneficial effects of the present invention, the applicant makes the following explanation on the preparation method of the part of the components and the sealing rubber strip in the present invention:

(one) crosslinking agent: the acrylic internal crosslinking agent is the most commonly used type of high polymer material, the applicant originally adopts the single component or the composite component of the acrylic internal crosslinking agent to obtain no desired technical effect, and after a large number of experiments, the applicant unexpectedly finds that the three components of triallyl isocyanurate, divinyl benzene and bis (2-ethylhexyl) peroxydicarbonate are cooperatively used, so that the purpose of the invention can be realized, a large number of uniformly distributed bridges can be quickly formed among the structural molecular chains in the sealing rubber strip, the constructed three-dimensional net structure is compact and stable, and the strength physical property of the rubber strip is further improved; if the composition or/and content of the cross-linking agent in the present invention is changed, the beneficial effects of the present invention cannot be well realized.

(II) coupling agent: the gamma-aminopropyltriethoxysilane is a silane coupling agent which is commonly used in the preparation and production of the sealing rubber strip, but the gamma-aminopropyltriethoxysilane is used as a single component to be applied to a production raw material system, which is not suitable and is difficult to achieve the purpose of the invention, and then the applicant skillfully utilizes the gamma-aminopropyltriethoxysilane and the titanate coupling agent 201 in a synergistic manner according to the mass ratio of (2-3) to (1-2), and obtains corresponding technical effects unexpectedly, so that the physical properties, the aging resistance and the like are obviously improved; if the composition or/and content of the coupling agent in the present invention is changed, the beneficial effects of the present invention cannot be well realized.

(III) accelerator: through a large number of experiments, the applicant finds that a mixed type accelerator obtained by combining the accelerator DM and the accelerator DCP according to the mass ratio of (3-4) to (1-2) is more suitable for the raw material preparation system of the invention, and the synergistic cooperation effect of the accelerator DM and the accelerator DCP can greatly improve the reaction acceleration efficiency and effectively improve the comprehensive performance of the finished sealing rubber strip; if the composition or/and content of the accelerator in the present invention is changed, the beneficial effects of the present invention cannot be well realized.

(IV) an anti-aging agent: similarly, the selection of the anti-aging agent component is not randomly obtained or originally existed, and is obtained by a great amount of experiments of the applicant, in the research and development, the applicant finds that the anti-aging agent AW, the anti-aging agent CPPD and the anti-aging agent RD are cooperatively used, and is more suitable for the preparation reaction system of the sealing rubber strip, the two components are combined and utilized according to the mass ratio of (2-3) to (1-2) to (3-4), so that the oxidation resistance, the stability and the service life of the material can be obviously improved; if the components or/and the content of the anti-aging agent are changed, the beneficial effects of the invention cannot be well realized.

Of course, because of the design considerations and the objectives of the sealant strip of the present invention, the selection of the remaining components and the selection of the amounts of the components of the sealant strip of the present invention are also not obvious and can no longer be easily envisioned by one skilled in the art in conjunction with the prior art. The method for preparing the sealing rubber strip is further embodied, and the preparation method adopts three steps I-III, the raw materials are added in batches and in portions, the steps are simple and orderly, the conventional one-time addition (such as comparative example 6) in the prior art is not adopted, the process is suitable for the special proportion of the raw material components for producing the sealing rubber strip, and the excellent characteristics of the finally prepared sealing rubber strip can be ensured only by adopting the process.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A preparation method of a high-performance sealing rubber strip for a building comprises the following steps:

and step 3: conveying the prepared mixture A, the prepared mixture B and the crosslinking agent to a screw extruder for heating and melting, then extruding the mixture into a die for cooling, forming and drying, wherein the rotating speed of a screw of the screw extruder is 34-38r/min, and the temperature of the screw is 85-95 ℃;

the anti-aging agent is obtained by combining an anti-aging agent AW, an anti-aging agent CPPD and an anti-aging agent RD according to the mass ratio of 2.5:1.4: 3.6.

2. The preparation method of the high-performance sealing rubber strip for the building as claimed in claim 1, characterized by comprising the following steps:

3. The preparation method of the high-performance sealing rubber strip for the building as claimed in claim 1, characterized by comprising the following steps:

4. The preparation method of the high-performance sealing rubber strip for the building as claimed in claim 1, wherein the sealing rubber strip is prepared from the following raw materials in parts by weight:

61 parts of chlorosulfonated polyethylene rubber;

30 parts of hydrogenated nitrile rubber;

15 parts of crystalline 1, 2 polybutadiene resin;

4 parts of methylisothiazolinone;

6 parts of tributoxyethyl phosphate;

7 parts of neopentyl glycol dimethacrylate;

10 parts of locust bean gum;

2.7 parts of sepiolite wool;

13 parts of palygorskite powder;

3.3 parts of a crosslinking agent;

0.8 part of a coupling agent;

accelerator 1.3 parts

1.5 parts of anti-aging agent.

5. The method for preparing a high-performance sealing rubber strip for buildings according to claim 1, wherein the molecular weight of the crystalline 1, 2 polybutadiene resin is 90000, and the crystallizable substance accounts for 24%.

6. The method of claim 1, wherein the cross-linking agent is a combination of triallyl isocyanurate, divinylbenzene and bis (2-ethylhexyl) peroxydicarbonate at a mass ratio of (3.5-4.5) to (2.2-2.7) to (1.4-1.6).

7. The method for preparing the high-performance sealing rubber strip for the buildings according to claim 6, wherein the crosslinking agent is obtained by combining triallyl isocyanurate, divinylbenzene and bis (2-ethylhexyl) peroxydicarbonate according to a mass ratio of 4:2.4: 1.5.

8. The preparation method of the high-performance sealing rubber strip for the building as claimed in claim 1, wherein the coupling agent is gamma-aminopropyltriethoxysilane, and the titanate coupling agent 201 are combined according to a mass ratio of 2.5: 1.4.

9. The method for preparing the high-performance sealing rubber strip for the buildings according to claim 1, wherein the accelerator is obtained by combining an accelerator DM and an accelerator DCP according to a mass ratio of 3.4: 1.6.