Composite modified polyformaldehyde material for preparing water supply pipe insert

Abstract

The invention discloses a composite modified polyformaldehyde material for preparing a water supply pipe insert. The material comprises the following ingredients: 100 weight parts of polyformaldehyde containing 25% of glass fiber, 20-30 weight parts of CaCO3-MBS copolymer mixture, 0.5-1 weight parts of carbon black color masterbatch, and 0.0002-0.0005 weight parts of white oil, wherein the CaCO3-MBS copolymer mixture comprises 100 weight parts of rigidity reinforcing agent, 1-2 weight parts of coupling agent, 2-4 weight parts of dispersant, 10-15 weight parts of impact modifier, 0.5-1 weight parts of anti-aging agent, 1-3 weight parts of first processing auxiliary agent, and 1-2 weight parts of second processing auxiliary agent, the rigidity reinforcing agent is light CaCO3 at 700 meshes, the first processing auxiliary agent is PE-wax, and the second processing auxiliary agent is calcium stearate. The material has excellent physical properties, thus the material can be used for processing the water supply pipe insert.

Description

technical field [0001] The invention relates to an engineering plastic, in particular to a composite modified polyoxymethylene material used for preparing an inlay of a water supply pipe. Background technique [0002] In the prior art, the inserts of water supply pipe fittings (see GB / T18742.3-2002 for details) are usually made of brass pipe fittings after machining and then chrome-plated or nickel-plated. prepared. However, brass inserts for water supply pipe fittings for domestic water supply pipes for hot and cold domestic water have the following disadvantages: [0003] 1. Since the outer surface of the brass water supply pipe insert is plated with chromium or nickel, it is not conducive to the control of the heavy metal chromium or nickel content in drinking water, and long-term drinking of water in contact with the above insert will threaten to human health. [0004] 2. The production and processing of brass water supply pipe fittings has high energy consumption, lo...

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Problems solved by technology

[0003] 1. Since the outer surface of the inner part of the brass water supply pipe fitting is plated with chrome or nickel, this is not conducive to the control of the content of heavy metal chromium or nickel in drinking water. Long-term drinking of water that is in contact with the above-mentioned inner part will threaten to human health

[0004] 2. The production and processing process of brass water supply pipe fittings has high energy consumption, low yield, and the electroplating process pollutes the environment. The entire production and processing process is not environmentally friendly

[0005] 3. Since the above water supply pipe fittings are made of brass, the processing cost is high, and a large amount of precious copper resources are also consumed

[0006] 4. Due to the large difference in thermal deformation rate between the inner parts of the brass water supply pipe fittings and the polypropylene pipe fittings, after long-term use, the surface of the inner parts of the water supply pipe fittings is easily oxidized, resulting in the difference between the inner parts of the water supply pipe fittings and the polypropylene pipe fittings. water leakage at the contact

[0009] However, due to the yield point tensile strength, hardness, rigidity, rupture point tensile strength, tensile coefficient, deflection coefficient, thermal deformation temperature, linear thermal expansion coefficient, sol temperature, tensile coefficient and other properties of the above-mentioned polyoxymethylene modified materials The indicators are all low, and the continuous use temperature range is small, the above-mentioned polyoxymethylene modified materials cannot be used to process the inner parts of water supply pipe fittings

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