Guangzhou Longkai Chemical Co., Ltd.
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Titanate has good coupling effect on thermoplastic polymer and filler
Author:LongKom  Time:2013-3-31

What are the advantages of titanate coupling agent as a type of coupling agent? How about its application? Titanate coupling agent is a coupling agent derived from titanium, which can react with free protons on the inorganic surface to form a unique organic monolayer on the inorganic surface. There are no multi-molecular layers on the interface, and the chemical structure of TiLink titanate can produce novel surface energy changes and react with polymers, resulting in the decrease of viscosity of non-filled and filled polymer composites.

When the polymer system is added, it can promote adhesion, catalyze, improve dispersion and rheological properties, improve impact strength, and do not produce brittleness; improve mechanical properties, so that the inorganic loading capacity is more than 50% of the filler; prevent phase separation; prevent corrosion and so on.

The reactivity of titanate coupling agent can be applied to different substrates, especially to some materials with poor modification effect of titanate coupling agent, such as calcium carbonate, barium sulfate, carbon black, nitrate, hydroxide, cellulose, inorganic pigments, aromatic fibers and carbon fibers, organic matter and polymer, as well as typical mineral fillers and inorganic compounds derived from metal oxides.

The addition of a titanate (or zirconate) coupling agent with hydrolysis and heat resistance to an unfilled polymer can act as a catalyst for in-situ RE-POLYMERIZATION in the melt phase of extrusion, blow-moulding and injection moulding processes, thus improving the processing and mechanical properties of the material. At the same time, titanate coupling agent is a compatibilizer of two or more polymers through re-polymerization, copolymerization or graft infiltration. When a new alkoxy (i.e. a new alkoxy group with quaternary carbon atoms) titanate is used in a polymer without filler, a bipolar electron transfer circuit will be formed when the well is combined with it, which acts as an antistatic agent without frosting and moisture. Titanate coupling agents can also react with various materials, such as CaCO3, BaSO4 and carbon black. Ceramics, Bodhisattva pigments and lake pigments, cellulose. Peroxide, arylphthalide amine fibers and carbon fibers, and inorganic compounds derived from minerals and metal oxides. Tetrafunctional compounds based on organometallic titanium (Ti) or zirconium (Zr) and silicon (Si) can be used as useful coupling agents because the tetravalence of their central atoms leads to electron sharing.

Each type has its inherent limitations. For example, the hydrolysis resistance and strength of Ti-O-M bond are superior to that of Si-O-M bond when coupling metal substrates. However, when silicon is coupled, the strength of Zr-O-Si or Si-O-Si bonds is superior to that of Ti-O-Si bonds.

In addition, in the presence of peroxide, Qin also acts as an oxidant, thus removing free radicals without peroxide and weakening the curing effect. However, germanium is an activator for peroxide, which can accelerate the curing reaction. Moreover, lead ester is superior to titanate as a binder promoter for halogenated base materials.

Titanate coupling agent was developed by Kentucky Petrochemical Company in the late 1970s. For thermoplastic polymers and dry fillers, good coupling effect can be achieved; this kind of coupling agent can be expressed by general formula: ROO (4-n) Ti (OX-R'Y) n (n=2,3); RO-is a hydrolyzable short-chain alkoxy group, which reacts with the surface hydroxyl of inorganic substances to achieve chemical coupling; OX-can be carboxyl, alkoxy, sulfonic, phosphorous groups, etc., these groups are very important and determine titanium. The special functions of esters, such as thixotropy given by sulfonic groups to organic compounds, flame retardant, rust-proof and adhesion-enhancing properties of pyrophosphate oxides, antioxidant and flame-resistant properties of phosphite oxides, can make titanate coupling agents possess both coupling and other special properties through the choice of OX-and R'-is a long carbon bonded alkyl group, which is relatively soft, capable and organic polymerization. The bending entanglement of the compound improves the compatibility of the organic and inorganic substances and improves the impact strength of the material; Y is hydroxyl, amino, epoxy or double bonded groups, which are connected at the end of the titanate molecule and can be chemically reacted with the organic substances. In the plastics industry, fillers can be activated to increase filling capacity, reduce resin consumption, reduce product cost, improve processing performance, increase product gloss and improve quality.

In the rubber industry, filler modification can play a reinforcing role, reduce the amount of rubber and antioxidant, improve the wear resistance and aging resistance of products, and its gloss has been significantly improved.

The application in paint industry can increase the amount of pigment filler, improve the dispersibility, have anti-sedimentation effect, prevent hair blossom, improve the strength of paint film, have bright color, and also have the characteristics of drying. It can also reduce the baking temperature and shorten the baking time for baking paint.

The dispersibility of pigments can be improved remarkably when applied in the pigments industry. It can shorten the grinding dispersing time and make the products bright.

In the paper industry, the dispersion of calcium carbonate or talc powder is improved, the loss is greatly reduced, the filling capacity is increased, the strength of paper is strengthened, and the printing performance of paper is improved.

The application in oilfield industry can improve gelling property, heat resistance temperature, downhole depth and permeability of fracturing fluid, and has remarkable effect on enhancing oil recovery.

The application in the magnetic material industry has greatly improved the dispersion of magnetic powder.