CN113185743A - Sealing rubber strip capable of turning directly and preparation method thereof - Google Patents

Sealing rubber strip capable of turning directly and preparation method thereof Download PDF

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Publication number
CN113185743A
CN113185743A CN202110480791.2A CN202110480791A CN113185743A CN 113185743 A CN113185743 A CN 113185743A CN 202110480791 A CN202110480791 A CN 202110480791A CN 113185743 A CN113185743 A CN 113185743A
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temperature
foaming agent
extruder
auxiliary
rubber strip
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CN113185743B (en
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李娜
钟香梅
张晓明
冯一阔
袁云飞
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Ningbo New Anton Sealing And Insulation System Co ltd
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Ningbo New Anton Sealing And Insulation System Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
    • C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
    • C08J9/102—Azo-compounds
    • C08J9/103—Azodicarbonamide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D99/00—Subject matter not provided for in other groups of this subclass
    • B29D99/0053—Producing sealings
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0066—Use of inorganic compounding ingredients
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
    • C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
    • C08J9/104—Hydrazines; Hydrazides; Semicarbazides; Semicarbazones; Hydrazones; Derivatives thereof
    • C08J9/105—Hydrazines; Hydrazides; Semicarbazides; Semicarbazones; Hydrazones; Derivatives thereof containing sulfur
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/04—N2 releasing, ex azodicarbonamide or nitroso compound
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/16—Ethene-propene or ethene-propene-diene copolymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2491/00—Characterised by the use of oils, fats or waxes; Derivatives thereof
    • C08J2491/06—Waxes

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

The application relates to the field of rubber, and particularly discloses a sealing rubber strip for direct turning and a preparation method thereof. The raw materials of the sealing rubber strip comprise the following components in parts by mass: EPDM29-35%, carbon black 23-29%, oil 18-24%, inorganic filler 12-18%, foaming agent 1-3%, zinc oxide 1.5-3.5%, and other auxiliary agent 6-9%. The utility model provides a sealed strip of gluing can be used to outer door and window, and it has sealed heat preservation soundproof advantage.

Description

Sealing rubber strip capable of turning directly and preparation method thereof
Technical Field
The application relates to the field of rubber, in particular to a sealing rubber strip for direct turning and a preparation method thereof.
Background
The main materials and the opening connecting mechanisms of the building outer doors and windows are hard materials, and the opening channels of the outer door and window frames need to be connected by elastomers, so that the sealing, heat-preservation and sound-insulation effects are achieved. Along with the increasing requirements of the external facade of the building on external doors and windows, the sizes of the external doors and windows cannot be unified, and the corner positions are particularly difficult to process when the sealing rubber strips are installed.
The mounting mode of the sealing rubber strip at the corner position mainly has two types: firstly, cutting off a sealing rubber strip, bonding a corner position by using glue or manufacturing a corner mould pressing piece at the corner position, and moving the corner cutting position to a position away from the corner by a certain distance to bond with the sealing rubber strip; and secondly, preparing sealing rubber strips with corresponding sizes according to the sizes of the outer doors and windows by adopting the whole frame rubber strips. The first mode has the risk of cracking and leaking of coming unstuck, and the second mode has outer door and window joint strip size a lot of, and manufacturing procedure is complicated, the problem of inefficiency.
Disclosure of Invention
In order to solve the problem that the corner position of the sealing rubber strip is difficult to process, the application provides the sealing rubber strip capable of turning directly and the preparation method thereof.
In a first aspect, the present application provides a joint strip for direct turning, which adopts the following technical scheme:
the sealing rubber strip capable of turning directly comprises the following raw materials in parts by mass: EPDM29-35%, carbon black 23-29%, oil 18-24%, inorganic filler 12-18%, foaming agent 1-3%, zinc oxide 1.5-3.5%, and other auxiliary agent 6-9%.
By adopting the technical scheme, the EPDM foaming adhesive tape has good shrinkage performance, and when the adhesive tape is bent, certain product phase change quantity is absorbed after foaming holes of a foaming section are extruded, and a natural radian is formed at a corner position.
The aperture of the existing EPDM foaming rubber strip is small, the surface is rough, the aperture of the sealing rubber strip prepared by the method is large, more energy can be absorbed, the deformation amount is increased, and the surface is soft and smooth.
The zinc oxide is used as an active agent, plays a role in heat conduction, and increases the heat resistance of the sealant strip.
Preferably, the foaming agent is foaming agent AC and/or foaming agent OB.
By adopting the technical scheme, the foaming agent is used for foaming the sealing rubber strip, and when the foaming agent AC and the foaming agent OB are used together, the foaming effect is better than that of the foaming agent AC or the foaming agent OB used singly.
Preferably, the foaming agent is a foaming agent AC and a foaming agent OB, and the mass ratio of the foaming agent AC to the foaming agent OB is (1-3): 1.
by adopting the technical scheme, when the mass ratio of the foaming agent AC to the foaming agent OB is (1-3): the foaming effect of the foaming agent is best when 1 is used.
Too large or too small mass ratio can influence the appearance of the sealing rubber strip, and when the sealing rubber strip is applied to a window frame, the sealing effect, the heat insulation effect and the sound insulation effect of the sealing rubber strip are all deteriorated.
If foaming agent AC is used alone, the integral gas evolution is large, the aperture of the product section is enlarged, even broken holes are formed, meanwhile, holes with small apertures are lacked on the surface and serve as framework supports, surface wrinkles are directly caused, and the sealing effect, the sound insulation effect, the wind pressure resistance and the heat insulation effect are affected due to the fact that the sealing force is poor.
If the OB foaming agent is used independently, the integral gas forming amount is small, the aperture of the section of the product is mainly a small-aperture hole, the product cannot obtain a relatively soft effect, the right-angle turning of the product is difficult, the window closing difficulty is large, and the design concept of the product is basically lost.
Preferably, the oil is a high flash point paraffinic oil.
By adopting the technical scheme, the high-flash-point paraffin oil and the rubber have good compatibility, and the color spraying phenomenon of the sealing rubber strip can be improved. The sealant strip prepared by adding the high-flash-point paraffin oil has the properties of good glossiness, aging resistance and the like.
In a second aspect, the application provides a method for preparing a sealing rubber strip for direct turning, which adopts the following technical scheme:
a preparation method of a sealing rubber strip for direct turning comprises the following preparation steps:
s1, setting the temperature of each section of the main extruder and the auxiliary extruder according to the technological parameters of the vulcanization line;
s2, adjusting the rotating speed of the main extruder and the auxiliary extruder, and extruding adhesive tapes;
s3, pulling the rubber strip to a homogenizing section, and heating;
s4, drawing the heated adhesive tape to spraying equipment for spraying;
and S5, drawing the sprayed adhesive tape to a hot air section for curing.
By adopting the technical scheme, the sealing rubber strip prepared by adopting the steps has the characteristics of smooth and fine surface, soft hand feeling, large compression elasticity, fine and uniform foaming pore diameter and the like.
Preferably, in S1, the temperature of the main machine head is 35-45 ℃, the temperature of the main machine cylinder 1 is 30-40 ℃, the temperature of the main machine cylinder 2 is 30-40 ℃, the temperature of the main machine feeding port is 30-40 ℃, and the temperature of the main machine screw is 25-35 ℃; in S2, the rotation speed of the main machine head is 4.9-5.3 r/min.
By adopting the technical scheme, the fluidity of the rubber material is moderate in the temperature range, the extruded rubber strip meets the required size, and the prepared sealing rubber strip has balanced performance.
If the temperature range is adjusted, the rotation speed of the main extruder needs to be adjusted correspondingly. When the temperature is set to 40-50 c, the rotation speed of the main extruder needs to be correspondingly reduced.
This is because the glue is in a semi-solid state and the higher the temperature, the more fluid the glue is, so that a corresponding reduction in the rotation speed is required, which would otherwise result in an extruded strip of larger dimensions and not meeting the dimensional requirements.
Meanwhile, the rubber material in the application has high requirement on temperature, and if the temperature is further increased to 50-60 ℃, the rubber material is in a semi-vulcanized state, so that the subsequent process is influenced.
Preferably, in S1, the temperature of the auxiliary machine head is 25-35 ℃, and the temperature of the auxiliary machine barrel 1 is 25-35 ℃; in S2, the rotation speed of the auxiliary machine head is 22.7-23.3 r/min.
By adopting the technical scheme, the fluidity of the rubber material is moderate in the temperature range, the extruded rubber strip meets the required size, and the prepared sealing rubber strip has balanced performance. If the temperature range is adjusted, the rotation speed of the auxiliary extruder needs to be correspondingly adjusted.
Preferably, the rotating speed of the main extruder is adjusted to 3-4r/min, and the speed is increased to 4.9-5.3r/min after the rubber strip is extruded for 1 minute; then the rotation speed of the auxiliary extruder is adjusted to 5-6r/min, and the speed is increased to 22.7-23.3r/min after the rubber strip is extruded for 1 minute.
By adopting the technical scheme, the extrusion time of the main extruder and the auxiliary extruder is 1 minute, so that the flowability of the rubber material is ensured, and the problems that the pressure is increased and safety accidents occur due to the too fast flowing of the rubber material are avoided.
If the rotation speed of the auxiliary extruder is directly adjusted to 22.7-23.3r/min, the rotation speed is not adjusted to 5-6r/min and the rotation speed is increased to 22.7-23.3r/min after extrusion for 1 minute, equipment explosion can be caused.
The cavity is arranged in the middle of the die, and the direct speed increase to 22.7-23.3r/min can cause the pressure in the cavity to be increased at a stroke, so that components in the cavity are deformed, a runner of the rubber material is changed, the shape and the size of the prepared rubber strip are changed, and the required shape and size cannot be met.
Preferably, in S3, the homogenizing section is heated using a salt bath.
Through adopting above-mentioned technical scheme, after rubber extrudes high temperature heating, because the inhomogeneous can lead to partial molecular chain not complete cross-linking of being heated, the mode that adopts salt bath heating can make rubber be heated evenly to improve the crosslinking degree of molecular chain, improve the performance of rubber then.
Preferably, in S5, the temperature of the hot air section is 250-270 ℃.
By adopting the technical scheme, the hot air section is arranged for drying the sprayed adhesive tape, so that the drying of the surface of the adhesive tape is accelerated.
If there is not hot-blast section, the adhesive tape surface is moist state, and when the adhesive tape was placed, the friction between adhesive tape and the adhesive tape can lead to spraying liquid to drop from the adhesive tape surface to influence the spraying effect.
In summary, the present application has the following beneficial effects:
1. the EPDM foaming adhesive tape has good shrinkage performance, and when the adhesive tape is bent, certain product phase change quantity is absorbed after foaming holes of a foaming section are extruded, and a natural radian is formed at a corner position;
2. the zinc oxide is used as an active agent, plays a role in heat conduction and increases the heat resistance of the sealing rubber strip;
3. the high flash point paraffin oil has good compatibility with rubber, and can improve the color spraying phenomenon of the sealing rubber strip;
4. the salt bath heating mode can ensure that the rubber is heated uniformly, thereby improving the crosslinking degree of molecular chains and further improving the performance of the rubber;
5. the sealing rubber strip prepared by the method has the advantages of smooth and fine surface, soft hand feeling, large compression elasticity and fine and uniform foaming pore diameter.
Drawings
FIG. 1 is a schematic cross-sectional view of a joint strip in an embodiment of the present application.
Description of reference numerals: 1. auxiliary adhesive tapes; 2. a main rubber strip.
Detailed Description
The present application will be described in further detail with reference to fig. 1 and the examples.
In the application, the carbon black is selected from fast extrusion carbon black; EPDM selects 5-11% of rubber material with medium Mooney, ethylene and high ENB content and 23-29% of rubber material with high Mooney, medium ethylene and high ENB content for combined use; the foaming agent AC is azodicarbonamide; the foaming agent OB is 4,4' -oxybis-benzenesulfonyl hydrazide.
Examples
Referring to fig. 1, the sealing rubber strip comprises an auxiliary rubber strip 1 and a main rubber strip 2, the auxiliary rubber strip 1 is made of unfoamed EPDM and is formed by extrusion of an auxiliary extruder, and the main rubber strip 2 is made of foamed EPDM in the present application and is formed by extrusion of a main extruder.
The preparation method of the sealing rubber strip for direct turning comprises the following preparation steps:
s1, mounting
Mounting the main extruder and the auxiliary extruder on a compounding machine head, and locking the main extruder and the auxiliary extruder by screws;
s2 setting parameters
Setting the temperature of each section of the main extruder and the auxiliary extruder according to the technological parameters of the vulcanization line;
wherein the temperature of the main machine head is 35-45 ℃, the temperature of the main machine cylinder 1 is 30-40 ℃, the temperature of the main machine cylinder 2 is 30-40 ℃, the temperature of the main machine feeding port is 30-40 ℃, the temperature of the main machine screw rod is 25-35 ℃, and the rotating speed of the main machine head is 4.9-5.3 r/min.
The temperature of the auxiliary machine head is 25-35 ℃, the temperature of the auxiliary machine barrel 1 is 25-35 ℃, and the rotation speed of the auxiliary machine head is 22.7-23.3 r/min;
s3, weighing
Weighing the raw materials in proportion, wherein the specific components and the dosage are shown in table 1;
s4, feeding
Firstly, opening a main extruder, feeding at a low speed of 3-4r/min, feeding the raw materials into the main extruder, after extruding for 1 m, returning the speed of the extruder to zero, and digging out the rubber material in a machine head by using a pry bar;
then opening an auxiliary extruder, feeding at a low speed of 3-4r/min, feeding the EPDM rubber material into the extruder, after extruding 20 m, enabling the speed of the extruder to return to zero, and leveling the rubber material at a discharge port of a machine head by using a crowbar;
s5, mode locking
Loading the heated mold into a machine head and locking the mold;
s6, speed regulation
Firstly, adjusting the rotating speed of a main extruder to 4.7-5.0r/min, and accelerating the speed to 5.1r/min after extruding the rubber strip for 1 minute; then adjusting the rotating speed of the auxiliary extruder to 5r/min, and accelerating the speed to 23r/min after extruding the rubber strips for 1 minute;
s7, homogenizing
Pulling the adhesive tape to a homogenizing section, and heating to obtain a heated adhesive tape;
the method comprises the following specific steps: the adhesive tapes are drawn to a conveying table and enter a homogenizing section to be heated in a salt bath, and after the adhesive tapes exit the homogenizing section and enter a hot air section, the adhesive tapes are sequentially drawn to a tractor;
wherein the temperature of the hot air section is 250-270 ℃;
s8, spraying
Drawing the heated adhesive tape to spraying equipment for spraying to obtain the sprayed adhesive tape;
the method comprises the following specific steps: opening the spraying equipment, adjusting the spraying surface of the spray gun, and spraying the part of the adhesive tape needing to be sprayed;
wherein the spraying liquid adopted by the spraying is KJW-831S;
s9, curing
The adhesive tape after spraying is pulled to a hot air section for curing to obtain a cured adhesive tape;
s10, cooling
And cooling the solidified adhesive tape, and inspecting and collecting the adhesive tape after cooling.
Example 1
The preparation method of the sealing rubber strip for direct turning comprises the following preparation steps:
s1, mounting
Mounting the main extruder and the auxiliary extruder on a compounding machine head, and locking the main extruder and the auxiliary extruder by screws;
s2 setting parameters
Setting the temperature of each section of the main extruder and the auxiliary extruder according to the technological parameters of the vulcanization line;
wherein the temperature of the main machine head is 40 ℃, the temperature of the main machine barrel 1 is 35 ℃, the temperature of the main machine barrel 2 is 35 ℃, the temperature of the feeding port of the main machine is 35 ℃, the temperature of the screw rod of the main machine is 30 ℃, and the rotating speed of the main machine head is 5.1 r/min.
The temperature of the auxiliary machine head is 30 ℃, the temperature of the auxiliary machine barrel 1 is 30 ℃, and the rotating speed of the auxiliary machine head is 23 r/min;
s3, weighing
Weighing the raw materials in proportion, wherein the specific components and the dosage are shown in table 1;
s4, feeding
Firstly, opening a main extruder, feeding at a low speed of 3-4r/min, feeding the raw materials into the main extruder, after extruding for 1 m, returning the speed of the extruder to zero, and digging out the rubber material in a machine head by using a pry bar;
then opening an auxiliary extruder, feeding at a low speed of 3-4r/min, feeding the EPDM rubber material into the extruder, after extruding 20 m, enabling the speed of the extruder to return to zero, and leveling the rubber material at a discharge port of a machine head by using a crowbar;
s5, mode locking
Loading the heated mold into a machine head and locking the mold;
s6, speed regulation
Adjusting the rotating speed of the main extruder and the auxiliary extruder to extrude adhesive tapes;
the method comprises the following specific steps: firstly, adjusting the rotating speed of a main extruder to 4r/min, and accelerating the speed to 5.1r/min after extruding the rubber strips for 1 minute; then adjusting the rotating speed of the auxiliary extruder to 5r/min, and accelerating the speed to 23r/min after extruding the rubber strips for 1 minute;
s7, homogenizing
Pulling the adhesive tape to a homogenizing section, and heating to obtain a heated adhesive tape;
the method comprises the following specific steps: the adhesive tapes are drawn to a conveying table and enter a homogenizing section to be heated in a salt bath, and after the adhesive tapes exit the homogenizing section and enter a hot air section, the adhesive tapes are sequentially drawn to a tractor;
wherein the temperature of the hot air section is 270 ℃;
s8, spraying
Drawing the heated adhesive tape to spraying equipment for spraying to obtain the sprayed adhesive tape;
the method comprises the following specific steps: opening the spraying equipment, adjusting the spraying surface of the spray gun, and spraying the part of the adhesive tape needing to be sprayed;
wherein the spraying liquid adopted by the spraying is KJW-831S;
s9, curing
The adhesive tape after spraying is pulled to a hot air section for curing to obtain a cured adhesive tape;
s10, cooling
And cooling the solidified adhesive tape, and inspecting and collecting the adhesive tape after cooling.
Examples 2 to 5
The joint strip of examples 2-5 was prepared in the same manner as in example 1, except that the amounts of the respective components of the raw materials and the process parameters were different, as shown in tables 1 and 2.
TABLE 1 raw material composition and amount of joint strip in examples 1-5
Figure DEST_PATH_IMAGE001
。
TABLE 2 Process parameters for examples 1-5
Figure 436611DEST_PATH_IMAGE002
。
Example 6
The process for the preparation of the joint strip in this example was identical to that of example 1, except that the blowing agent was only blowing agent AC, and the total mass of blowing agent was 3g, without any change.
Example 7
The process for the preparation of the joint strip in this example was identical to that of example 1, except that the blowing agent was blowing agent OB only, and the total mass of the blowing agent was 3g, without any change.
Example 8
The preparation method of the joint strip in the embodiment is the same as that in embodiment 1, except that the mass ratio of the foaming agent AC to the foaming agent OB is 1: 2.
example 9
The preparation method of the joint strip in the embodiment is the same as that in embodiment 1, except that the mass ratio of the foaming agent AC to the foaming agent OB is 4: 1.
example 10
The method of making the joint strip in this example was the same as in example 1, except that the oil was a low flash point paraffin oil.
Example 11
The method of manufacturing a joint strip in this example was the same as in example 1, except that
In S7, the rubber strip is pulled into a conveying table and enters a homogenizing section without salt bath heating.
Example 12
The preparation method of the sealing rubber strip in the embodiment is the same as that in the embodiment 1, and the difference is only that the specific step of S7 is as follows: the adhesive tape is drawn to enter a microwave feeding section of the conveying table, after the adhesive tape exits from the microwave feeding section and enters a first section hot air section, the microwave is started, the microwave power is adjusted to 5.2KW, and the adhesive tape is sequentially drawn to the tractor.
Example 13
The method of manufacturing a joint strip in this example was the same as in example 1, except that
In S2, the temperature of the main machine cylinder 1 is 40-50 ℃, and the temperature of the main machine cylinder 2 is 40-50 ℃.
Example 14
The method of manufacturing a joint strip in this example was the same as in example 1, except that
In S2, the temperature of the main machine cylinder 1 is 50-60 ℃, and the temperature of the main machine cylinder 2 is 50-60 ℃.
Comparative example
Comparative example 1
The process for the preparation of the joint strip of this comparative example was the same as in example 1, except that no zinc oxide was added to the starting material.
Comparative example 2
The joint strip of this comparative example was prepared in the same manner as in example 1, except that no foaming agent was added to the raw materials.
Performance test
The joint sealants obtained in examples 1 to 11 and comparative examples 1 to 2 were tested for their properties, as shown in Table 3, and as shown in Table 4.
TABLE 3 test items, technical indexes and test methods of joint strip
Figure DEST_PATH_IMAGE003
。
TABLE 4 test results of examples 1 to 11 and comparative examples 1 to 2
Figure 340370DEST_PATH_IMAGE004
。
It can be seen from the combination of examples 1-3 and table 4 that the sealing rubber strip prepared by using the raw material mixture ratio of the present application has the characteristics of smooth and fine surface, soft hand feeling, large compression elasticity, fine and uniform foaming pore diameter, etc., and can be used for sealing a window frame and realizing direct turning of a corner position.
As can be seen by combining examples 1 and 4 to 5 with Table 4, when the mass ratio of blowing agent AC to blowing agent OB is (1 to 3): 1, the foaming agent has good foaming effect on the sealing rubber strip, and the prepared sealing rubber strip has smooth and fine surface, soft hand feeling and large compression elasticity.
When the foaming agent is only the foaming agent AC or the foaming agent OB, the foaming effect of the foaming agent on the bead is poor, and the bead has high hardness, small pore size, and a rough surface, as can be seen by combining examples 1 and 6 to 7 with table 4. When compressed, it cannot absorb much energy, resulting in a reduced amount of deformation.
When the mass ratio of the foaming agent AC to the foaming agent OB is smaller or larger, the foaming effect of the foaming agent on the sealing rubber strip is different from that of the sealing rubber strip when the mass ratio of the foaming agent AC to the foaming agent OB is (1-3): 1, the foaming effect of the foaming agent on the sealing rubber strip.
It can be seen from the combination of example 1 and example 10 and table 4 that the high-flash-point paraffin oil can improve the glossiness of the joint strip, and the surface glossiness of the joint strip prepared by using the low-flash-point paraffin oil in example 10 is lower than that of the joint strip prepared by using the high-flash-point paraffin oil in example 1, and the surface of the joint strip in example 10 is rough.
In example 11, the joint strip obtained without salt bath heating had high hardness and reduced tensile strength and elongation at break, as seen in combination of example 1 and example 11 and table 4.
When example 1 and example 12 were combined and table 4 was repeated, it was found that the foam cell diameter of the joint strip obtained in example 12 was not uniform when microwave heating was used in place of salt bath heating in example 1 in example 12.
The reason for this may be: the microwave heating mode leads to the condition of excessive vulcanization, and when the surface of the sealing rubber strip is completely vulcanized, the inside of the sealing rubber strip is not completely vulcanized, so that the foaming pore diameter is not uniform, and further the performance of the sealing rubber strip is not balanced.
Combining example 1 and examples 13-14 with table 4, it can be seen that the temperature has a large influence on the joint strip, and a joint strip with good performance can be obtained only by matching the appropriate temperature range and rotation speed.
The temperature range in example 13 is 40-50 ℃, the temperature range in example 14 is 50-60 ℃, the size of the sealing rubber strip is inconsistent with the requirement due to the fact that the rotating speed is not changed correspondingly, and the size of the sealing rubber strip in example 14 is larger than that of the sealing rubber strip in example 13.
Combining example 1 and comparative example 1 with table 4, it can be seen that the addition of zinc oxide can act as an activator, thereby improving the mechanical properties of the joint strip.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims (10)

1. The sealing rubber strip capable of turning directly is characterized by comprising the following raw materials in parts by mass: EPDM29-35%, carbon black 23-29%, oil 18-24%, inorganic filler 12-18%, foaming agent 1-3%, zinc oxide 1.5-3.5%, and other auxiliary agent 6-9%.
2. A direct turn joint strip according to claim 1, wherein: the foaming agent is foaming agent AC and/or foaming agent OB.
3. A direct turn joint strip according to claim 2, wherein: the foaming agent is foaming agent AC and foaming agent OB, and the mass ratio of the foaming agent AC to the foaming agent OB is (1-3): 1.
4. a direct turn joint strip according to claim 1, wherein: the oil is a high flash point paraffin oil.
5. A method of making a direct turn joint strip according to any of claims 1 to 4, comprising the steps of:
s1, setting the temperature of each section of the main extruder and the auxiliary extruder according to the technological parameters of the vulcanization line;
s2, adjusting the rotating speed of the main extruder and the auxiliary extruder, and extruding adhesive tapes;
s3, pulling the rubber strip to a homogenizing section, and heating;
s4, drawing the heated adhesive tape to spraying equipment for spraying;
and S5, drawing the sprayed adhesive tape to a hot air section for curing.
6. The method for manufacturing a direct-turn joint strip according to claim 5, wherein: in S1, the temperature of a main machine head is 35-45 ℃, the temperature of a main machine cylinder 1 is 30-40 ℃, the temperature of a main machine cylinder 2 is 30-40 ℃, the temperature of a main machine feeding port is 30-40 ℃, and the temperature of a main machine screw is 25-35 ℃; in S2, the rotation speed of the main machine head is 4.9-5.3 r/min.
7. The method of making a direct turn bead as claimed in claim 6, wherein: in S1, the temperature of the auxiliary machine head is 25-35 ℃, and the temperature of the auxiliary machine barrel 1 is 25-35 ℃; in S2, the rotation speed of the auxiliary machine head is 22.7-23.3 r/min.
8. The method of making a direct turn bead as claimed in claim 7, wherein: firstly, adjusting the rotating speed of a main extruder to 3-4r/min, and after extruding the rubber strips for 1 minute, increasing the speed to 4.9-5.3 r/min; then the rotation speed of the auxiliary extruder is adjusted to 5-6r/min, and the speed is increased to 22.7-23.3r/min after the rubber strip is extruded for 1 minute.
9. The method for manufacturing a direct-turn joint strip according to claim 5, wherein: in S3, the homogenization section is heated using a salt bath.
10. The method for manufacturing a direct-turn joint strip according to claim 5, wherein: in S5, the temperature of the hot air section is 250-270 ℃.
CN202110480791.2A 2021-04-30 2021-04-30 Sealing rubber strip capable of turning directly and preparation method thereof Active CN113185743B (en)

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CN105330985A (en) * 2015-11-12 2016-02-17 浙江百纳橡塑设备有限公司 Salt bath vulcanization technology for ethylene propylene diene monomer foamed profile
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