Car antifreeze, as an important medium in the engine cooling system, protects the normal driving of the car at all times. The PA66 (Nylon Double Six), after being modified by hydrolysis resistance, is endowed with the characteristics of anti-freeze fluid for automobiles, which can be used for manufacturing automotive parts such as water chambers, cooling pipes, and cooling pots. Since 2017, the major ADN adiponitrile manufacturers have continuously declared force majeure, and the price of PA66 (nylon double six) has risen, and PA6 (nylon single six) as the best alternative to PA66 has been well received by auto parts suppliers And OEM favored. In 2018 and 2019, PA6 has sprung up on various parts and components. The first- and second-tier auto parts suppliers in the industry rely on the huge price difference advantage of PA6, even in the Chinese auto industry is facing severe production and sales challenges in 2019. It can also stop losses in time, and some manufacturers have even completed the annual profit target.
Industry problems
However, among all the auto parts, there is one application from beginning to end, and it is still impossible to use nylon 6 to replace nylon 66. It is the part in the cooling system mentioned above. Due to its molecular chain structure characteristics, PA6 will be severely corroded during the immersion of the cooling fluid, leading to the failure of parts and even leakage of the cooling fluid.
AKRO-PLASTIC Engineering Plastics has successfully developed the world's first hydrolysis-resistant nylon single six (PA6). Considerable in terms of functionality, test resistance and safety, this material has made The test came out frequently.
Material characteristics: not only resistant to hydrolysis
This is a new PA6 / PP alloy modified material. Through the introduction of polyolefin molecular chain groups, the major properties of nylon materials are optimized:
While improving water absorption and moisture absorption, dimensional stability is higher
Flow performance is greatly improved
Impact performance is enhanced
Enhanced chemical resistance
Lower density and lower unit cost
PA6 base material is cheaper than PA66, and the comprehensive cost reduction can reach more than 20%
Rigorous testing
Different OEMs have different definitions for hydrolysis-resistant materials, including coolant type, temperature, and immersion time.
In the above three German test standards, AKRO's new hydrolysis-resistant PA6 material has passed the tests of VW Volkswagen and BMW:
According to the VW Volkswagen hydrolysis resistance material test standard, after completing the entire cycle, the remaining value of the bending strength must be ≥ 25MPa.
As can be seen from the test results, both AKROMID® PA6 GF30 HR and the PA66 GF30 HSLR that have been approved by VW have passed the test, but the remaining bending strength of AKROMID® PA6 GF30 HR is much higher than the required 25MPa, and its hydrolysis resistance is more Excellent.
Test results from BMW
According to BMW's hydrolysis resistance material test standard, after completing the entire cycle, the remaining tensile strength, tensile modulus, flexural modulus and elongation at break of the material are tested. As can be seen from the test results, AKROMID® PA6 GF30 HR has met the minimum requirements and passed the test.
Overcome problems and bid farewell to the risk of leakage
Even for the PA66 material that is resistant to hydrolysis modification, after immersed in high-temperature glycol cooling liquid, the phenomenon of surface cracking is a historical problem that cannot be solved. This has led to a significant increase in the risk of coolant leakage during long-term driving.
The AKROMID® PA6 GF30 HR developed by AKRO did not crack on the surface after 3,000 hours of 135 ° C cooling fluid immersion, which completely solved the industry's problems.
Without DPPD
What is DPPD
DPPD, chemical name: N, N’-diphenyl-p-phenylenediamine, is commonly used as an additive in the polyamide (commonly known as nylon) industry for hydrolysis and aging resistance. The safety of engineering plastic components used in the automotive industry is regularly checked in accordance with the REACH directive. Recently, DPPD has been classified as a high-risk component, so this will mean that polyamide materials with a DPPD content exceeding 0.1% will need to be declared.
DPPD-free hydrolysis-resistant nylon
AKRO-PLASTIC's hydrolysis-resistant polyamide-based materials have been widely used in the coolant-resistant applications of passenger cars, trucks, and special vehicles for a long time. We have developed DPPD-free hydrolysis-resistant hydrolysis-resistant materials for newer regulations Polyamide material, including this hydrolysis-resistant PA6 GF30.
AKRO-PLASTIC, based on years of technology precipitation from Germany, insists on customer first and is willing to provide more and better product solutions to global customers.