Formula of high-toughness ethylene propylene diene monomer cooling water pipe

Abstract

The invention relates to a high-toughness ethylene propylene diene monomer cooling water pipe formula which comprises the following components in parts by weight: 80-120 parts of ethylene propylene diene monomer blend rubber, 0.5-1.5 parts of stearic acid, 8-15 parts of an active agent, 0.5-1.5 parts of an anti-aging agent, 3-7 parts of an auxiliary agent, 70-100 parts of carbon black, 25-40 parts of a functional reinforcing agent, 12-20 parts of a softening agent and 4-7 parts of a cross-linking agent. Weighing the raw materials in parts by weight; step S2, glue mixing; the method has the advantages that many factors such as internal lubricity, ductility, toughness, vulcanization sufficiency and the like of rubber which affect rubber pipe depoling and elbow cracking during depoling are greatly improved, and the problems that the EPDM cooling water pipe is difficult to depoling and easy to crack during depoling are solved.

Description

Technical Field

[0001] The invention relates to the field of rubber materials, and in particular to a high-toughness EPDM rubber cooling water pipe formula. Background Art

[0002] The development of the new energy vehicle industry is of great significance to reducing pollutant emissions in the transportation sector, promoting high-quality reduction of dependence on oil imports, and supporting the construction of a global automotive power. Correspondingly, it also promotes the development of new energy vehicle technology and drives the technological innovation of related supporting parts.

[0003] At present, the pipelines of new energy vehicles have relatively longer and more complex cooling circuits than those of traditional gasoline vehicles. As a result, there are more and more elbows on the rubber tubes of the cooling circuits. The rubber tubes made of traditional polyester rubber have insufficient toughness and internal lubricity, and there are problems such as difficulty in core removal and cracking at the elbows during core removal.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0005] In view of the deficiencies in the prior art, the invention discloses a formula for a high-toughness EPDM rubber cooling water pipe.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A high-toughness EPDM rubber cooling water pipe formula,

[0008] The invention comprises the following components counted by weight: 80-120 parts of EPDM rubber, 0.5-1.5 parts of stearic acid, 8-15 parts of active agent, 0.5-1.5 parts of antioxidant, 3-7 parts of auxiliary agent, 70-100 parts of carbon black, 25-40 parts of functional reinforcing agent, 12-20 parts of softener and 4-7 parts of cross-linking agent.

[0009] Furthermore, the EPDM rubber is compounded by 4045 EPDM rubber, LIR-50 polymer and RICON150DA polymer, and the compounding ratio is 60-80 parts of 4045 EPDM rubber, 15-25 parts of LIR-50 polymer, and 5-15 parts of RICON 150DA polymer.

[0010] Furthermore, the active agent includes 5 to 7 parts of magnesium oxide and 3 to 5 parts of zinc oxide.

[0011] Furthermore, the auxiliary agent includes 2 to 4 parts of auxiliary agent PEG4000 and 1 to 3 parts of STRUKTOL·WB42.

[0012] Furthermore, the carbon black includes 45-60 parts of N550 carbon black and 25-40 parts of N774 carbon black.

[0013] Furthermore, the functional reinforcing agent is micro-nano spherical silicon powder PG-500.

[0014] Furthermore, the active agent includes 8 to 15 parts of softener TOPFINE 2310 and 4 to 8 parts of softener TOPFINE 323.

[0015] Furthermore, the cross-linking agent includes 2 to 4 parts of a vulcanizing agent BIBP 980W and 1.5 to 3 parts of a vulcanizing activator TAIC.

[0016] Furthermore, the antioxidant is antioxidant RD.

[0017] A method for manufacturing a high-toughness EPDM rubber cooling water pipe comprises the following steps:

[0018] Step S1, weighing each component raw material by weight;

[0019] Step S2, mixing rubber, putting 4045 EPDM rubber, LIR-50 polymer, and RICON 150DA polymer into an internal mixer for mixing, draining the rubber after mixing for 3 to 5 minutes, and then thinning the rubber on an open mixer for 6 times to obtain EPDM mixed rubber;

[0020] Step S3, mixing, includes the following steps:

[0021] The first step: put EPDM and rubber into internal mixer;

[0022] The second step: adding weighed stearic acid, activator, antioxidant and additives;

[0023] The third step: adding carbon black, functional reinforcing agent and new softener;

[0024] The fourth step: lift the top bolt and mix the materials twice;

[0025] The fifth step: adding a cross-linking agent;

[0026] The sixth step: lift the upper plug to mix the materials once and discharge the glue at 140-160℃.

[0027] The beneficial effects of the present invention are as follows:

[0028] 1. EPDM rubber is used as the basic material of rubber. The three polymers LIR-50, RICON 150DA and 4045 EPDM rubber work together to form a dense network structure, improve the toughness and ductility of EPDM rubber, avoid the problem of core pulling difficulties when making bent pipes, and avoid breakage of the bends during the use and production of bent pipes.

[0029] 2. Micro-nano spherical silicon powder PG-500 is used as a functional reinforcing agent. It is quasi-spherical in shape. Due to its high sphericity and uniform particle size distribution, it has good fluidity and high filling properties. In the polymer base material, it can fill the gap more effectively, improve the density of the material, and give the rubber good internal lubricity and ductility, which is conducive to the rapid core removal of the hose and improves the toughness of the rubber pipe.

[0030] 3. The combined use of two high temperature resistant softeners TOPFINE2310 and TOPFINE323 with different molecular weights can increase the plasticity of the rubber, reduce the viscosity of the rubber and the temperature during mixing, improve the dispersion and mixing properties, improve the elongation properties of the rubber, and improve the tearing of the rubber under high temperature conditions.

[0031] 4. Additive EG4000, namely polyethylene glycol 4000, is a medium molecular weight polymer with good water solubility, lubricity, moisture retention and dispersibility. The alcohol group (i.e. -OH group) reacts with the acidic substances (such as H+ ions) on the surface of the acidic filler to generate corresponding alcohol salts and water, thereby reducing the acidity of the filler, while wetting the surface of the acidic filler, improving the bonding performance of the filler with the rubber matrix, improving the interaction between the rubber molecular chain and the filler, making it easier for the rubber molecular chain to combine with the filler surface, thereby improving the vulcanization efficiency and cross-linking density, and then promoting vulcanization and improving the vulcanization degree of the rubber.

[0032] 5. The additive STRUKTOL·WB42 can significantly improve the fluidity of rubber during processing. This may be due to the special chemical structure of the additive, which can play a lubricating role between rubber molecular chains, thereby reducing the friction resistance between molecular chains, making the rubber material easier to flow and shape during processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of the steps for making a high-toughness EPDM rubber cooling water pipe. DETAILED DESCRIPTION

[0034] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0035] Embodiment 1:

[0036] A high-toughness EPDM cooling water pipe formula comprises raw material components counted by weight: 60 parts of 4045 EPDM rubber, 25 parts of LIR-50 polymer, 15 parts of RICON·150DA polymer, 1 part of stearic acid, 6 parts of magnesium oxide, 4 parts of zinc oxide, 1 part of antioxidant RD, 3 parts of PEG4000, parts of STRUKTOL·WB42, 60 parts of N550 carbon black, 30 parts of N774 carbon black, 30 parts of micro-nano spherical silicon powder PG-500, 8 parts of TOPFINE2310, 5 parts of TOPFINE323, 3.3 parts of BIBP 980W and 2.1 parts of TAIC.

[0037] Preparation method of EPDM cooling water pipe, such as Figure 1 As shown, the following steps are included:

[0038] Step S1, weighing each component raw material according to weight.

[0039] Step S2, mixing rubber, putting the 4045 EPDM rubber, LIR-50 polymer and RICON·150DA polymer weighed as required into an internal mixer for mixing rubber. The mixing time is 3 to 5 minutes, followed by rubber discharge, and then thinning through the open mixer for 6 times to obtain EPDM mixed rubber.

[0040] Step S3, mixing, includes the following steps:

[0041] The first step: put the EPDM rubber into the internal mixer again.

[0042] The second step: put stearic acid, magnesium oxide, zinc oxide, antioxidant RD, PEG4000 and STRUKTOL·WB42 into the internal mixer.

[0043] The third step: put N774 carbon black, micro-nano spherical silicon powder PG-500, TOPFINE2310TOPFINE323 into the internal mixer.

[0044] The fourth step: the internal mixer lifts the top bolt twice to complete the material mixing.

[0045] Step 5: Add BIBP 980W and TAIC into the internal mixer.

[0046] The sixth step: the internal mixer lifts the top bolt once to complete the material mixing, and finally discharges the glue at 140-160℃.

[0047] Finally, the obtained rubber is fed into a pipe mold for extrusion molding.

[0048] Embodiment 2:

[0049] The difference from Example 1 is:

[0050] A high-toughness EPDM rubber cooling water pipe formula comprises raw material components counted by weight: 70 parts of 4045 EPDM rubber, 20 parts of LIR-50 polymer, 10 parts of RICON 150DA polymer, 1 part of stearic acid, 6 parts of magnesium oxide, 4 parts of zinc oxide, 1 part of antioxidant RD, 3 parts of PEG4000, 2 parts of STRUKTOL WB42, 50 parts of N550 carbon black, 30 parts of N774 carbon black, 30 parts of micro-nano spherical silicon powder PG-500, 12 parts of TOPFINE2310, 5 parts of TOPFINE323, 3.3 parts of BIBP 980W and 2.1 parts of TAIC.

[0051] The preparation method of the EPDM rubber cooling water pipe is the same as that in Example 1.

[0052] Embodiment 3:

[0053] The difference from Example 1 is:

[0054] A high-toughness EPDM cooling water pipe formula comprises raw material components counted by weight: 70 parts by weight of 4045 EPDM rubber, 15 parts by weight of LIR-50 polymer, 15 parts by weight of RICON 150DA polymer, 1 part by weight of stearic acid, 6 parts by weight of magnesium oxide, 4 parts by weight of zinc oxide, 1 part by weight of antioxidant RD, 3 parts by weight of PEG4000, 2 parts by weight of STRUKTOL WB42, 50 parts by weight of N550 carbon black, 30 parts by weight of N774 carbon black, 30 parts by weight of micro-nano spherical silicon powder PG-500, 12 parts by weight of TOPFINE2310, 5 parts by weight of TOPFINE323, 3.3 parts by weight of BIBP 980W and 2.1 parts by weight of TAIC.

[0055] The preparation method of the EPDM rubber cooling water pipe is the same as that in Example 1.

[0056] Product performance testing:

[0057] The rubber products prepared in Examples 1 to 3 were tested according to the SMTC 5320003 test standard. The results are shown in Table 1.

[0058]

[0059] Table 1

[0060] Test result analysis:

[0061] Rubber performance at room temperature: hardness, low temperature resistance and ozone resistance meet the standards, tensile strength is increased by nearly 40% compared with the standard, elongation at break is increased by 13-26%, and tear strength is increased by nearly 30%.

[0062] The rubber products obtained in Examples 1 to 3 were processed into cooling water pipe assemblies, and tested according to the SMTC 9313001 test standard. The test results are shown in Table 2.

[0063] Inspection items Standard value Example 1 Example 2 Example 3 Permanent deformation 160℃×22h(%) ≤80 78 75 75 Peel strength between inner and outer layers (N / cm) ≥2.4 3 2.8 2.7 pulse ≥180,000 ≥180,000 ≥180,000 ≥180,000

[0064] Table 2

[0065] Test result analysis:

[0066] The water pipes were stored at 160°C for 22 hours, and their deformation did not exceed the standard.

[0067] The strength of the inner and outer glass layers of the water pipe is increased by nearly 10% compared to the standard.

[0068] Pulse detection is OK.

[0069] In summary, the technical indicators of the formula of the present invention fully meet the technical standards, and have greatly improved many factors affecting the core removal of the hose and the cracking of the elbow during the core removal, such as the internal lubricity, ductility, toughness, and sufficient vulcanization of the rubber. The problem of long and complex EPDM rubber cooling water pipes being difficult to remove and easy to crack during the core removal is greatly reduced, and its production process performance is improved.

[0070] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0071] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A high-toughness EPDM rubber cooling water pipe formula, characterized in that: The invention comprises the following components counted by weight: 80-120 parts of EPDM rubber, 0.5-1.5 parts of stearic acid, 8-15 parts of active agent, 0.5-1.5 parts of antioxidant, 3-7 parts of auxiliary agent, 70-100 parts of carbon black, 25-40 parts of functional reinforcing agent, 12-20 parts of softener and 4-7 parts of cross-linking agent.

2. The high-toughness EPDM rubber cooling water pipe formula according to claim 1 is characterized by: The EPDM blended rubber is prepared by compounding 4045 EPDM rubber, LIR-50 polymer and RICON 150DA polymer, and the compounding ratio is 60-80 parts of 4045 EPDM rubber, 15-25 parts of LIR-50 polymer and 5-15 parts of RICON 150DA polymer.

3. The high-toughness EPDM rubber cooling water pipe formula according to claim 1 is characterized in that: The active agent includes 5 to 7 parts of magnesium oxide and 3 to 5 parts of zinc oxide.

4. The high-toughness EPDM rubber cooling water pipe formula according to claim 1, characterized in that: The auxiliary agent includes 2 to 4 parts of auxiliary agent PEG4000 and 1 to 3 parts of STRUKTOL·WB42.

5. The high-toughness EPDM rubber cooling water pipe formula according to claim 1, characterized in that: The carbon black includes 45-60 parts of N550 carbon black and 25-40 parts of N774 carbon black.

6. The high-toughness EPDM rubber cooling water pipe formula according to claim 1, characterized in that: The functional reinforcing agent is micro-nano spherical silicon powder PG-500.

7. The high-toughness EPDM rubber cooling water pipe formula according to claim 1, characterized in that: The active agent includes 10-8 to 15 parts of softener TOPFINE23 and 3-4 to 8 parts of softener TOPFINE32.

8. The high-toughness EPDM rubber cooling water pipe formula according to claim 1, characterized in that: The cross-linking agent includes 2-4 parts of a vulcanizing agent BIBP 980W and 1.5-3 parts of a vulcanizing activator TAIC.

9. The high-toughness EPDM rubber cooling water pipe formula according to claim 1, characterized in that: The antioxidant is antioxidant RD.

10. A method for manufacturing a high-toughness EPDM rubber cooling water pipe according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step S1, weighing each component raw material by weight; Step S2, mixing rubber, putting 4045 EPDM rubber, LIR-50 polymer, and RICON 150DA polymer into an internal mixer for mixing, draining the rubber after mixing for 3 to 5 minutes, and then thinning the rubber on an open mixer for 6 times to obtain EPDM mixed rubber; Step S3, mixing, includes the following steps: The first step: put EPDM and rubber into internal mixer; The second step: adding weighed stearic acid, activator, antioxidant and additives; The third step: adding carbon black, functional reinforcing agent and new softener; The fourth step: lift the top bolt and mix the materials twice; The fifth step: adding a cross-linking agent; The sixth step: lift the upper plug to mix the materials once and discharge the glue at 140-160℃.

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