Two-component online foaming sealing ring material as well as preparation method and application thereof

Abstract

The invention discloses a two-component online foaming sealing ring material and a preparation method and application thereof, and the two-component online foaming sealing ring material is prepared by foaming the following raw materials in parts by weight: a component A and a component B in a weight ratio of 100: (20-30), the component A comprises the following components in parts by weight: 70-90 parts of polyether polyol I, 0-10 parts of polyether polyol II, 1-2 parts of a chain extender, 0.2-1 part of a foaming agent, 5-20 parts of a solid filler, 0.3-0.6 part of a catalyst, 0.2-1 part of a surfactant, 1-3 parts of a thixotropic agent and 0-3 parts of color paste; the component B is prepared from the following component in parts by weight: modified diphenylmethane diisocyanate. The sealing ring material has an obvious thixotropic effect and a high aspect ratio greater than 0.65, and due to the addition of the low-cost filler, the performance of the sealing ring is not lost, the mechanical property is greatly improved, the cost of raw materials is reduced, the production process can be greatly reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to a two-component online foaming sealing ring material and a preparation method and application thereof, belonging to the technical field of lightweight foam. Background Art

[0002] "Development of Polyurethane Composite Material for Automobile Air Filter" discloses a polyurethane composite material for automobile air filter (Progress in Fine Petrochemicals, Vol. 1, No. 9, 2000). Its main component A liquid contains 70-100 parts by weight of polyether polyol GEP-330N, 0-30 parts by weight of polymer polyol GPOP-36 / 28G, 2-6 parts by weight of chain extender, 2-6 parts by weight of cross-linking agent, 0.6-1.3 parts by weight of composite catalyst, 0.15-0.3 parts by weight of foaming agent, 0.5-1.0 parts by weight of foam stabilizer, 0.05-0.5 parts by weight of pigment, and 0.5-1.0 parts by weight of dispersant. Its main component B liquid is: aminoacetate modified multi-methyl polyphenyl isocyanate, liquefied multi-methyl polyphenyl isocyanate, and polymerized multi-methyl polyphenyl isocyanate. The mixture is stirred and mixed in proportion, and the functionality of the mixture is between 2.1 and 2.4. The polyurethane composite material has the advantages of good storage stability, and the casting process performance and product performance have reached the level of similar foreign products. CN105111395A discloses a method for preparing a polyurethane automobile air filter element, which overcomes the cumbersome heating and dissolving process in the preparation process, and the prepared polyurethane automobile air filter element has good flexibility and mechanical strength.

[0003] However, in the automobile door panels and the current new energy battery housing seals, due to the increasing inconsistency between the structure and the shape, it is impossible to shape the seal ring through the mold shape. If conventional foaming products are used for foaming on a flat plate, the raw materials will be scattered everywhere and cannot be self-shaped well. While improving production efficiency, good process matching problems must also be met. Therefore, it is very necessary to develop a polyurethane air online foaming seal ring with good sealing effect, simple preparation process, excellent thixotropic function, and controllable cost. Summary of the invention

[0004] Purpose of the invention: The first purpose of the present invention is to provide a two-component online foaming sealing ring material, the second purpose of the present invention is to provide a method for preparing the two-component online foaming sealing ring material, and the third purpose of the present invention is to provide the application of the two-component online foaming sealing ring material in sealing automobile door panels or electronic appliance door panels.

[0005] Technical solution: The present invention discloses a two-component online foaming sealing ring material, which is made by foaming the following raw materials in a weight ratio: component A: component B is 100:20-30, wherein component A comprises the following components in parts by weight: 70-90 parts of polyether polyol I, 0-10 parts of polyether polyol II, 1-2 parts of chain extender, 0.2-1 part of foaming agent, 5-20 parts of solid filler, 0.3-0.6 parts of catalyst, 0.2-1 parts of surfactant, 1-3 parts of thixotropic agent, and 0-3 parts of color paste; component B comprises the following components in parts by weight: modified diphenylmethane diisocyanate.

[0006] Furthermore, polyether polyol I includes polyether polyol terminated with ethylene oxide by copolymerizing ethylene oxide and propylene oxide with at least one of glycerol or trimethylolpropane as an initiator, and has a hydroxyl value of 25 to 30 mgKOH / g and a viscosity of 800 to 1500 mpa·s at 25°C.

[0007] Furthermore, the polyether polyol I is selected from at least one of CHE-330N, CHE-2801L or Wanol F3135.

[0008] Furthermore, polyether polyol II includes polyether polyol terminated with propylene oxide by copolymerization and addition of ethylene oxide and propylene oxide with propylene glycol as initiator, and has a hydroxyl value of 52-58 mgKOH / g and a viscosity of 400-800 mpa·s at 25°C.

[0009] Furthermore, the polyether polyol II is selected from one or both of NJ-220 and CHE-220.

[0010] Furthermore, the foaming agent is water.

[0011] Furthermore, the solid filler is one or a mixture of white carbon black, calcium carbonate CCS-25, fly ash, lignin, titanium dioxide, talc or barium sulfate.

[0012] Furthermore, the thixotropic agent is one or a mixture of fumed silica, hydrogenated castor oil, polyamide wax or organic bentonite.

[0013] Furthermore, the thixotropic agent used was KS-150 produced by Anhui Zaisheng New Material Technology Co., Ltd.

[0014] Furthermore, the color paste is Bomeishi black paste 031-9NN015.

[0015] Furthermore, the chain extender is selected from at least one of alcohol compounds or amine compounds with a functionality of 2.

[0016] Furthermore, the chain extender is selected from at least one of ethylene glycol (MEG), diethylene glycol (DEG) or 1,4-butanediol (1-4BDO).

[0017] Furthermore, the catalyst is a tertiary amine catalyst.

[0018] Furthermore, the tertiary amine catalyst is a gel-type catalyst selected from at least one of DPA, Z-130, Dabco NE1070, Dabco 33-LV or Dabco 8154;

[0019] Furthermore, the surfactant is a polysiloxane-oxyalkylene block copolymer.

[0020] Furthermore, the surfactant is selected from at least one of B8734 LF2, B8738LF2, S6109 or S6308.

[0021] Further, the modified diphenylmethane diisocyanate is selected from at least one of Wannat-100LL, Cosmonate LL, Lupranate MM103 and Suprasec 2020.

[0022] A method for preparing the two-component online foaming sealing ring material of the present invention comprises the following steps:

[0023] (1) mixing polyether polyol I, polyether polyol II, a chain extender, a catalyst, a surfactant, a solid filler, a thixotropic agent, a color paste and a foaming agent to obtain a mixed solution I;

[0024] (2) preparing carbodiimide-modified diphenylmethane diisocyanate as material II;

[0025] (3) Mix the mixed liquid I and material II at high speed, and inject them into the surface of the material to be sealed, and let them mature.

[0026] Furthermore, in step (1), the mixing and stirring temperature is 20 to 25°C.

[0027] Furthermore, in step (3), the aging time is more than 10 minutes.

[0028] The two-component online foaming sealing ring material of the present invention is used in sealing automobile door panels or electronic appliance door panels.

[0029] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages:

[0030] The invention provides a novel method for preparing an online foaming sealing ring for a polyurethane automobile door panel, an electric cabinet and a battery cover. The method is simple and easy to operate. The polyurethane automobile air filter element prepared by the preparation method has the advantages of high mechanical strength, excellent compression resistance, good thixotropic performance and wide process matching. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a sealing effect diagram of Example 1;

[0032] Figure 2 This is the sealing effect diagram of comparative example 2. DETAILED DESCRIPTION

[0033] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0034] The raw materials and sources used in the following experiments are shown in Table 1.

[0035] Table 1 Raw materials and sources

[0036]

[0037]

[0038] Examples 1 to 3

[0039] (1) Prepare material A according to Table 2, polyether polyol I, polyether polyol II, chain extender, catalyst, surfactant, solid filler, thixotropic agent, color paste and foaming agent, and stir them evenly at a temperature of 20 to 25° C. to obtain material A;

[0040] (2) preparing carbodiimide-modified diphenylmethane diisocyanate as material B;

[0041] (3) Material A and material B are pumped into the material tank A and material tank B of the low-pressure machine respectively, and the high-pressure circulation is started respectively; the weight ratio of material A to material B is set to 100:20-30 on the low-pressure machine, and the temperature of the raw materials is controlled at 25±2°C. After material A and material B are mixed and stirred at high speed by the low-pressure machine, they are quickly injected into the surface of the pre-prepared special-shaped air filter frame, and follow the shape of the special-shaped air filter. After 10 minutes, the surface aging is completed, and the material can be injected at room temperature. The sealing effect of Example 1 is as follows: Figure 1 As shown. Figure 1 It can be seen that the sealing effect is good and the surface is smooth and flat.

[0042] Table 2 Raw materials of various components in Examples 1-3

[0043]

[0044]

[0045] Comparative Examples 1-3

[0046] The preparation process is the same as that of Example 1, except that the raw materials are as shown in Table 3.

[0047] Table 3 Comparative Examples 1-3 Component Raw Materials

[0048]

[0049] The foams prepared in Examples 1-3 and Comparative Examples 1-3 were subjected to tensile tests according to GB / T 6344-2008 "Determination of tensile strength and elongation at break of flexible foam polymeric materials", and compression set tests were conducted according to GB / T6669-2008 "Soft foam polymeric material compression set tester", the surface dry time is the time from the start of pouring the raw materials into the equipment to the time when the surface of the rubber strip is no longer sticky, and the aspect ratio is the ratio of the highest height of the final rubber strip divided by the widest width. The results are shown in Table 4.

[0050] Table 4 Foam performance data prepared in Examples 1-3 and Comparative Examples 1-3

[0051]

[0052]

[0053] As can be seen from Tables 3 and 4, the raw material temperature of Example 1-3 is 23±2°C, the milky time can be controlled to be above 30 seconds, which meets the current process requirements, the dispensing time is 30S, the dispensing flow rate is 6g / s, the gun head moving speed is 75mm / S, the surface drying requirement is within 10 minutes, the compression permanent deformation is ≤15%, the aspect ratio is ≥0.65, and dispensing can be performed on products of different sizes.

[0054] From the comparison of Table 2, Table 3 and Table 4, it can be seen that the milky time of Comparative Example 1 is 20 seconds, the reaction is too fast, it is easy to block the gun head, the actual height is also short, and the density is too high. The density difference between Example 1 and Comparative Example 3 is about 20%. The aspect ratio of Comparative Example 3 is only 0.6, which is not suitable for the current products on the market (requirement ≥ 0.65), and the reaction time of Comparative Example 3 is too long to meet the mass production requirements. The effect diagram of Comparative Example 2 is as follows Figure 2 As shown. Figure 2 It can be seen that the top shrinks after sealing. Therefore, it can be seen that the effects of Comparative Examples 1-3 obtained by not meeting the ratio of raw materials specified in the present invention are not as good as the sealing effects of Examples 1-3.

Claims

1. A two-component online foaming sealing ring material, characterized in that: The two-component online foaming sealing ring material is made by foaming the following raw materials in a weight ratio: component A: component B is 100:20-30, wherein component A includes the following components in weight: 70-90 parts of polyether polyol I, 0-10 parts of polyether polyol II, 1-2 parts of chain extender, 0.2-1 part of foaming agent, 5-20 parts of solid filler, 0.3-0.6 parts of catalyst, 0.2-1 parts of surfactant, 1-3 parts of thixotropic agent, and 0-3 parts of color paste; component B includes the following components in weight: modified diphenylmethane diisocyanate.

2. The two-component online foaming sealing ring material according to claim 1, characterized in that: Polyether polyol I includes a polyether polyol capped with ethylene oxide by copolymerizing ethylene oxide and propylene oxide with at least one of glycerol or trimethylolpropane as an initiator, and has a hydroxyl value of 25 to 30 mgKOH / g and a viscosity of 800 to 1500 mPa·s at 25°C; polyether polyol II includes a polyether polyol capped with propylene oxide by copolymerizing ethylene oxide and propylene oxide with propylene glycol as an initiator, and has a hydroxyl value of 52 to 58 mgKOH / g and a viscosity of 400 to 800 mPa·s at 25°C.

3. The two-component online foaming sealing ring material according to claim 3, characterized in that: The foaming agent is water; the solid filler is one or a mixture of white carbon black, calcium carbonate, fly ash, lignin, titanium dioxide, talc or barium sulfate; the thixotropic agent is one or a mixture of fumed silica, hydrogenated castor oil, polyamide wax or organic bentonite; the color paste is Bomax black paste 031-9NN015.

4. The two-component online foaming sealing ring material according to claim 1, characterized in that: The chain extender is selected from at least one of alcohol compounds or alcoholamine compounds with a functionality of 2; the catalyst is a tertiary amine catalyst; and the surfactant is a polysiloxane-olefin oxide block copolymer.

5. The two-component online foaming sealing ring material according to claim 4, characterized in that: The chain extender is selected from at least one of ethylene glycol, diethylene glycol or 1,4-butanediol.

6. The two-component online foaming sealing ring material according to claim 4, characterized in that: The tertiary amine catalyst is a gel-type catalyst, selected from at least one of DPA, Z-130, Dabco NE1070, Dabco 33-LV or Dabco 8154; the surfactant is selected from at least one of B8734 LF2, B8738LF2, S6109 or S6308.

7. The two-component online foaming sealing ring material according to claim 1, characterized in that: The modified diphenylmethane diisocyanate is selected from at least one of Wannat-100LL, Cosmonate LL, Lupranate MM103 and Suprasec2020.

8. A method for preparing the two-component online foaming sealing ring material according to any one of claims 1 to 7, characterized in that: The following steps are involved: (1) polyether polyol I, polyether polyol II, chain extender, catalyst, surfactant, solid filler, thixotropic agent, color paste and foaming agent are mixed and stirred to obtain material A; (2) preparing carbodiimide-modified diphenylmethane diisocyanate as material B; (3) Mix material A and material B at high speed, inject into the surface of the material to be sealed, and let mature.

9. The preparation method according to claim 8, characterized in that: In step (1), the mixing and stirring temperature is 20 to 25° C., and in step (3), the aging time is more than 10 minutes.

10. Use of the two-component online foaming sealing ring material according to any one of claims 1 to 7 in sealing automobile door panels or electronic appliance door panels.

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