Continuous production method of rubber and plastic insulation board
By adjusting the addition method of accelerator and activator and optimizing the mixing parameters, the problem of high space occupation and cost caused by the placement of semi-finished films is solved, and the continuous production of rubber and plastic insulation boards is realized, which improves production efficiency and maintains excellent materials. performance.
Patent Information
- Application Number
- CN202411397687.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-09
- Publication Date
- 2024-12-06
AI Technical Summary
In the production process of traditional rubber and plastic foam insulation materials, semi-finished films need to be placed at least half a month to stabilize their performance, resulting in large space occupation, high cost and low production efficiency, which is particularly obvious in large-scale industrial production.
By adjusting the addition method of accelerator and activator, combined with the optimization of mixing parameters, the continuous production of rubber and plastic insulation boards is achieved, avoiding the placement step of semi-finished film, improving production efficiency and reducing costs.
The continuous production of high-quality rubber and plastic insulation boards has been achieved, which reduces storage space and management costs, significantly improves production efficiency, and reduces production costs, while maintaining excellent performance of materials, such as low thermal conductivity, fire resistance, flame retardant, Moisture-proof and moisture-proof, shock-absorbing and other characteristics.
Smart Images
Figure CN119081209A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of rubber-plastic thermal insulation boards, and in particular to a continuous production method of rubber-plastic thermal insulation boards. Background Art
[0002] Rubber-plastic foam insulation material is a kind of insulation material made of nitrile rubber (NBR) and polyvinyl chloride (PVC) as the main raw materials. Rubber-plastic foam insulation material has the advantages of low thermal conductivity, fire retardant, moisture resistance, shock absorption, environmental health, long service life, beautiful appearance and easy installation. It is widely used in the insulation of cold and hot medium pipes or containers in the fields of central air conditioning, construction, chemical industry, medicine, textile, metallurgy, shipbuilding, automobile, electrical appliances, etc.
[0003] The production process of rubber-plastic foam insulation materials is generally to first refinish the raw materials and ingredients, then mix, extrude, foam at high temperature, cool and shape, and then carry out a series of cutting processes into different types of products, such as rubber-plastic insulation pipes, rubber-plastic insulation boards and shell protection materials, and then package them and finally put them on the market. In this traditional rubber-plastic foam insulation material preparation process, the semi-finished mixed film is generally not directly put into the extrusion process, but the semi-finished film needs to be placed for at least half a month, and the subsequent process flow can be carried out after the performance of the semi-finished product is stable, so as to reduce the risk of quality problems such as blistering, delamination, cracking, and rough surface after the semi-finished film is mixed with the accelerator.
[0004] However, the placement process of semi-finished film takes up a lot of space, increases the storage and management costs of semi-finished products, and reduces the production efficiency of finished products. These problems are particularly obvious in large-scale industrial production. Therefore, how to overcome the above problems and provide a continuous production method for obtaining high-quality rubber-plastic insulation boards without placing semi-finished films separately is of great significance to improving the production efficiency of rubber-plastic insulation boards and reducing the production cost of rubber-plastic insulation boards. Summary of the invention
[0005] To solve the above problems, the present invention provides a continuous production method for rubber-plastic insulation boards. The method realizes the continuous production of high-quality rubber-plastic insulation boards by adjusting the addition method of promoters and activators in combination with the adjustment of mixing parameters, thereby improving the production efficiency of rubber-plastic insulation boards and reducing the preparation cost of rubber-plastic insulation boards.
[0006] The continuous production method of the rubber-plastic insulation board of the present invention comprises the following steps:
[0007] S1. After preheating the internal mixer, add nitrile rubber, antioxidant, antioxidant, light stabilizer, polyethylene glycol, solid paraffin, stearic acid, phosphorus flame retardant and mix well;
[0008] S2, mixing polyvinyl chloride, aluminum hydroxide, coloring reinforcing agent, foaming agent and plasticizer uniformly to obtain a mixture, dividing the mixture into two parts, putting the first part of the mixture into an internal mixer for primary mixing, and then putting the second part of the mixture into a second mixing;
[0009] S3, after the mixing is completed, the material is unloaded and the rubber material is transferred to the open mixing mill. After swinging the material for 100 seconds, the accelerator and the activator are added, and then the material swinging is continued for 180 seconds;
[0010] S4, rolling the rubber into sheets and cooling them, extruding them into sheets and sending them into a foaming furnace for foaming, cooling, cutting and packaging them after foaming, and obtaining rubber-plastic insulation boards.
[0011] Furthermore, the mass proportions of each raw material in the production method are as follows: 15-25 parts of nitrile rubber, 15-25 parts of polyvinyl chloride, 1-2 parts of polyethylene glycol, 0.1-1 parts of stearic acid, 15-28 parts of plasticizer, 1-6 parts of accelerator, 0.1-1.5 parts of active agent, 2-8 parts of coloring reinforcing agent, 10-15 parts of foaming agent, 1-5 parts of solid paraffin, 0.2-1 parts of antioxidant, 0.5-1.5 parts of antioxidant, 0.8-3 parts of light stabilizer, 15-25 parts of aluminum hydroxide, and 0.5-2 parts of phosphorus flame retardant.
[0012] Preferably, the mass parts of each raw material in the production method are as follows: 16 parts of nitrile rubber, 20 parts of polyvinyl chloride, 1.4 parts of polyethylene glycol, 0.3 parts of stearic acid, 15.6 parts of plasticizer, 3.51 parts of accelerator, 0.59 parts of activator, 4 parts of coloring reinforcing agent, 13.5 parts of foaming agent, 1.6 parts of solid paraffin, 0.8 parts of antioxidant, 1.2 parts of antioxidant, 2.3 parts of light stabilizer, 18 parts of aluminum hydroxide, and 1.2 parts of phosphorus flame retardant.
[0013] Furthermore, the plasticizer is one or both of chlorinated paraffin oil and epoxidized soybean oil. Preferably, the plasticizer is composed of chlorinated paraffin oil and epoxidized soybean oil in a mass ratio of (15-25):(1-3).
[0014] Furthermore, the accelerator is one or both of accelerator DPTT and accelerator PZ. Preferably, the accelerator is composed of accelerator DPTT and accelerator PZ in a mass ratio of (1-5):(0.1-1.5).
[0015] Furthermore, the active agent is zinc oxide and zinc benzenesulfinate. Preferably, the active agent is composed of zinc oxide and zinc benzenesulfinate in a mass ratio of 0.37:0.22.
[0016] Furthermore, the coloring reinforcing agent is carbon black.
[0017] Furthermore, the foaming agent is an AC foaming agent.
[0018] Furthermore, the antioxidant is antioxidant 264.
[0019] Furthermore, the antioxidant is the antioxidant DTPD.
[0020] Furthermore, the light stabilizer is light stabilizer 1010.
[0021] Furthermore, the phosphorus-based flame retardant is phosphite.
[0022] Furthermore, the preheating temperature of the internal mixer is 35°C.
[0023] Furthermore, the mass ratio of the first mixture to the second mixture is 2:1.
[0024] Furthermore, the primary mixing temperature is 45°C-50°C, the primary mixing time is 2 min, the secondary mixing temperature is 55°C-60°C, the secondary mixing time is 9.5 min, and the two mixing speeds are both 40-45 r / min.
[0025] Furthermore, two sweeps were performed during the secondary mixing process, wherein the first sweep was performed at 6 minutes after the secondary mixing, and the second sweep was performed at 7.5 minutes after the secondary mixing.
[0026] Furthermore, the unloading temperature is 170°C-175°C, and the temperature is kept for 30 seconds before unloading.
[0027] Further, the temperature of the feed port of the open mill is 35°C-45°C, the temperature of the extruder is 35°C-50°C, the temperature of the screw is 25°C-35°C, and the temperature of the die is 40°C-50°C. Preferably, the temperature of the feed port of the open mill is 45°C, the temperature of the extruder is 40°C, the temperature of the screw is 30°C, and the temperature of the die is 50°C.
[0028] Furthermore, the foaming furnace is divided into 7 zones, wherein the temperature of zone one is 125°C, the temperature of zone two is 130°C, the temperature of zone three is 142°C, the temperature of zone four is 153°C, the temperature of zone five is 165°C, the temperature of zone six is 170°C, and the temperature of zone seven is 175°C.
[0029] Compared with the prior art, the beneficial technical effects of the present invention are:
[0030] The continuous production method of the rubber-plastic insulation board of the present invention realizes the continuous production of high-quality rubber-plastic insulation boards by adjusting the adding method of the promoter and the activator and optimizing the mixing parameters, reduces the storage space and management costs, significantly improves the production efficiency, and reduces the production cost.
[0031] The rubber-plastic thermal insulation board produced by the invention has multiple excellent properties such as low thermal conductivity, fire retardancy, moisture resistance, shock absorption, etc., and is suitable for multiple fields. BRIEF DESCRIPTION OF THE DRAWINGS
[0032] The present invention will be further described below in conjunction with the accompanying drawings.
[0033] Figure 1 The rubber-plastic insulation board prepared in Example 1 of the present invention;
[0034] Figure 2 The rubber-plastic insulation board prepared in Comparative Example 1 of the present invention;
[0035] Figure 3 The rubber-plastic insulation board prepared in Comparative Example 2 of the present invention;
[0036] Figure 4 The rubber-plastic insulation board prepared in Comparative Example 3 of the present invention;
[0037] Figure 5 The rubber-plastic insulation board prepared in Comparative Example 4 of the present invention;
[0038] Figure 6 For the control sample. DETAILED DESCRIPTION
[0039] The technical solution provided by the present invention is further described below in conjunction with embodiments.
[0040] Embodiment 1 A continuous production method of a rubber-plastic insulation board comprises the following steps:
[0041] S1, preheat the internal mixer to 35 ° C and keep it warm for 1 min, then add 16 parts by mass of nitrile rubber, 2640.8 parts by mass of antioxidant, 1.2 parts by mass of antioxidant DTPD, 2.3 parts by mass of light stabilizer 1010, 1.4 parts by mass of polyethylene glycol, 1.6 parts by mass of solid paraffin, 0.3 parts by mass of stearic acid, and 1.2 parts by mass of phosphite and mix them evenly;
[0042] S2, 20 parts by mass of polyvinyl chloride, 18 parts by mass of aluminum hydroxide, 4 parts by mass of carbon black, 13.5 parts by mass of AC foaming agent, 14 parts by mass of chlorinated paraffin oil, and 1.6 parts by mass of epoxidized soybean oil are added to obtain a mixture, and the mixture is divided into two parts at a mass ratio of 2:1, the first part of the mixture is put into an internal mixer for a first mixing at 50°C for 2 minutes, and then the second part of the mixture is put into an internal mixer for a second mixing at 60°C for 9.5 minutes, and after the mixing is completed, the temperature is raised to 174°C and kept warm for 30 seconds before unloading; two cleanings are performed during the secondary mixing, wherein the first cleaning is performed at 6 minutes of the secondary mixing, and the second cleaning is performed at 7.5 minutes of the secondary mixing, and the cleaning is specifically: using a scraper to clean the powder on the pressure hammer and the wall of the internal mixing chamber into the internal mixing chamber; the speed of the two mixings is 42r / min;
[0043] S3, after the mixing is completed, the material is unloaded and the rubber material is transferred to the open mill. The feed port temperature of the open mill is set to 45°C, the extruder temperature is 40°C, the screw temperature is 30°C, and the head temperature is 50°C. After swinging the material for 100s, 2.45 parts of accelerator DPTT, 1.06 parts of accelerator PZ, 0.37 parts of activator zinc oxide, and 0.22 parts of zinc benzenesulfinate are added, and then the material is continued to swing for 180s to make the accelerator and the activator evenly dispersed;
[0044] S4. The rubber material is rolled into a sheet and then cooled. After extrusion molding, it is sent to a foaming furnace for foaming. The foaming furnace is divided into 7 zones, wherein the temperature of zone 1 is 125°C, the temperature of zone 2 is 130°C, the temperature of zone 3 is 142°C, the temperature of zone 4 is 153°C, the temperature of zone 5 is 165°C, the temperature of zone 6 is 170°C, and the temperature of zone 7 is 175°C. After foaming, it is cooled, cut, and packaged to obtain a rubber-plastic insulation board.
[0045] Comparative Example 1
[0046] Same as Example 1, except that the accelerator and the activator are added during the secondary cleaning.
[0047] Comparative Example 2
[0048] Same as Example 1, except that the accelerator and the activator are added after the secondary mixing is completed and the temperature is raised to 174°C.
[0049] Comparative Example 3
[0050] Same as Example 1, except that the mixing speed is 38 r / min.
[0051] Comparative Example 4
[0052] Same as Example 1, except that the mixing speed is 48 r / min.
[0053] Test Example 1
[0054] The product performance of Example 1 and Comparative Examples 1-4 was tested, and the products produced by normal process were used as controls. The test results are shown in Table 1:
[0055] Table 1
[0056]
[0057] Observing the products obtained in the examples and comparative examples and combining the test results, it can be found that the product prepared in Example 1 ( Figure 1 ) and control samples ( Figure 6 ) has no significant difference in appearance, and is comparable to the control sample in comprehensive performance, and is even slightly better than the control sample in parameters such as oxygen index, smoke density, and vacuum volume water absorption.
[0058] The product of Comparative Example 1 ( Figure 2 ) Bubbling and stratification occurred, and the product of comparative example 2 ( Figure 3 ) Bubbling, stratification and cracking may occur, which may be caused by the premature addition of promoters and surfactants.
[0059] The product of Comparative Example 3 ( Figure 4 ) has a rough surface, pinhole-like, and unclear lines. The reason may be that the speed of the internal mixer is too low during the mixing process, the heat is insufficient, and the material distribution is uneven, resulting in the subsequent vulcanization and foaming process cannot proceed smoothly. The product of comparative example 4 ( Figure 5 ) Bubbling, stratification and surface cracking may occur. The reason may be that the speed of the internal mixer is too fast during the mixing process, resulting in premature vulcanization, which in turn leads to unstable subsequent production.
[0060] It can be seen that the preparation process of the present invention needs to strictly control the timing of adding the accelerator and the activator and the rotation speed of the internal mixer during the mixing process to ensure that the preparation of the product can proceed smoothly.
[0061] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of the present invention. At the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.
Claims
1. A continuous production method for rubber-plastic insulation board, characterized in that: The following steps are involved: S1. After preheating the internal mixer, add nitrile rubber, antioxidant, antioxidant, light stabilizer, polyethylene glycol, solid paraffin, stearic acid, phosphorus flame retardant and mix well; S2, mixing polyvinyl chloride, aluminum hydroxide, coloring reinforcing agent, foaming agent and plasticizer uniformly to obtain a mixture, dividing the mixture into two parts, putting the first part of the mixture into an internal mixer for primary mixing, and then putting the second part of the mixture into a second mixing; S3, after the mixing is completed, the material is unloaded and the rubber material is transferred to the open mixing mill. After swinging the material for 100 seconds, the accelerator and the activator are added, and then the material swinging is continued for 180 seconds; S4, rolling the rubber into a sheet and cooling it, extruding it into a sheet and sending it into a foaming furnace for foaming, cooling, cutting and packaging after the foaming is completed to obtain a rubber-plastic insulation board; The primary mixing temperature is 45°C-50°C, the primary mixing time is 2 minutes, the secondary mixing temperature is 55°C-60°C, the secondary mixing time is 9.5 minutes, and the two mixing speeds are both 40-45 r / min.
2. The production method according to claim 1, characterized in that The mass proportions of the raw materials in the production method are as follows: 15-25 parts of nitrile rubber, 15-25 parts of polyvinyl chloride, 1-2 parts of polyethylene glycol, 0.1-1 parts of stearic acid, 15-28 parts of plasticizer, 1-6 parts of accelerator, 0.1-1.5 parts of active agent, 2-8 parts of coloring reinforcing agent, 10-15 parts of foaming agent, 1-5 parts of solid paraffin, 0.2-1 parts of antioxidant, 0.5-1.5 parts of antioxidant, 0.8-3 parts of light stabilizer, 15-25 parts of aluminum hydroxide, and 0.5-2 parts of phosphorus flame retardant.
3. The production method according to claim 2, characterized in that: The mass parts of each raw material in the production method are as follows: 16 parts of nitrile rubber, 20 parts of polyvinyl chloride, 1.4 parts of polyethylene glycol, 0.3 parts of stearic acid, 15.6 parts of plasticizer, 3.51 parts of accelerator, 0.59 parts of active agent, 4 parts of coloring reinforcing agent, 13.5 parts of foaming agent, 1.6 parts of solid paraffin, 0.8 parts of antioxidant, 1.2 parts of antioxidant, 2.3 parts of light stabilizer, 18 parts of aluminum hydroxide, and 1.2 parts of phosphorus flame retardant.
4. The production method according to claim 1, characterized in that The accelerator is one or both of accelerator DPTT and accelerator PZ.
5. The production method according to claim 1, characterized in that: The active agents are zinc oxide and zinc benzenesulfinate.
6. The production method according to claim 1, characterized in that: The mass ratio of the first mixed material to the second mixed material is 2:
1.
7. The production method according to claim 1, characterized in that: During the secondary mixing, cleaning was performed twice, wherein the first cleaning was performed at 6 minutes of secondary mixing, and the second cleaning was performed at 7.5 minutes of secondary mixing.
8. The production method according to claim 1, characterized in that: The unloading temperature is 170°C-175°C, and the temperature is kept for 30 seconds before unloading.
9. The production method according to claim 1, characterized in that: The temperature of the feeding port of the mixing mill is 35°C-45°C, the temperature of the extruder is 35°C-50°C, the temperature of the screw is 25°C-35°C, and the temperature of the die is 40°C-50°C.
10. The production method according to claim 1, characterized in that: The foaming furnace is divided into 7 zones, wherein the temperature of zone 1 is 125°C, the temperature of zone 2 is 130°C, the temperature of zone 3 is 142°C, the temperature of zone 4 is 153°C, the temperature of zone 5 is 165°C, the temperature of zone 6 is 170°C, and the temperature of zone 7 is 175°C.