TMC-311W
Titanate coupler
CAS:
Molecular Formula:
TMC-311W - Names and Identifiers
| Name | Titanate coupler |
| Synonyms | TMC-311W Titanate coupler |
TMC-311W - Physico-chemical Properties
| Use | Used in polyolefin, polyvinyl chloride resin, synthetic rubber, paint and other polymer materials |
TMC-311W - Classification and Function
Coupling agent can improve the interface characteristics between polymer materials and fillers. It is a type of substance with amphoteric structure. Some groups in their molecules can react with chemical groups on the surface of inorganic substances to form a strong chemical bond. The other part of the group has organophilic properties, which can react with organic molecules or physically entangle, so as to firmly combine the two materials with different properties. This makes the use of inorganic substances with a wide range of sources, low prices or specific properties as fillers or enhancers for plastics, which can not only reduce the cost of plastics, but also endow products with other valuable properties, such as improving mechanical properties, product size stability, etc., and expand the application range of plastics.
There are many kinds of coupling agents, commonly used are titanate, aluminate, silane and other varieties.
(1) The titanate coupling agent molecule contains an alkoxy group and three long-chain molecular structural units. When the coupling agent interacts with the powdery filler, the alkoxy group seizes the protons on the surface of the filler, and the protons are derived from the filler The bound water, including crystal water, chemically adsorbed water and physically adsorbed water, forms chemical bonds, and covers the molecular layer of the coupling agent on the surface of the filler. The three long-chain molecular structural units at the other end of the coupling agent can be chemically crosslinked or physically entangled with polymer molecules, and finally the inorganic filler and polymer are well combined to improve the tensile strength of the material, Elongation and impact strength. At the same time, the effect of the coupling agent reduces the surface energy of the filler, improves the dispersion ability of the filler in the resin, reduces the viscosity of the filling system, increases the filling amount, reduces mechanical wear, saves power consumption, and reduces cost.
(2) Silane coupling agent is the most widely used coupling agent. Its general structure is Rsix3. R is an active functional group with affinity or reaction ability with polymer molecules, such as amino group, mercapto group, vinyl group, epoxy group, cyano group, methacryloxy group, etc. X is an alkoxy group that can be hydrolyzed. When used as a coupling agent, X group is first hydrolyzed to form silanol, and then reacts with hydroxyl group on the surface of the filler.
(3) Since most of the products of silane coupling agent and titanate coupling agent are liquid, this brings trouble to the addition of high-mixing machines, and the color of these products will also affect the filling of the modified masterbatch. Therefore, the aluminate coupling agent and the solid wax-like new type of light white composite coupling agent, because the solid wax-like material is easy to measure and add, easy to use, and light and white in color, it has been favored by manufacturers of inorganic powder modified materials such as calcium carbonate.
Last Update：2024-04-10 22:29:15
TMC-311W - Molecular Structure and Mechanism of Action
The molecular structure of the titanate coupling agent can be divided into 6 functional areas. Each functional area has its own characteristics and plays its own role in the coupling agent.
General formula of titanate coupling agent and 6 functional areas
Fig. 1 is the general formula of titanate coupling agent and 1 ≤M≤ 4,M N≤ 6 in 6 functional areas. R-short carbon chain alkane group; R & prime;-long carbon chain alkane group; X--C, n, p, s and other elements; Y-hydroxyl, amino, double bond and other groups.
Functional area 1 --(RO)M is a group coupled with inorganic fillers and pigments. The titanate coupling agent is chemically adsorbed or chemically reacted with trace hydroxyl groups or protons on the surface of inorganic pigments or fillers through the alkoxy group, and is coupled to the surface of inorganic pigments and fillers to form a monolayer, and at the same time isopropanol is released.
Functional area 2 -- Ti-O... ester group transfer and cross-linking group. Some titanate coupling agents can transfer and cross-link ester groups and carboxyl groups in organic polymers, resulting in cross-linking between titanates, fillers or pigments and organic polymers, which promotes the increase of system viscosity to be thixotropic.
Functional area 3-X-the group that connects the titanium center. The group includes long chain alkoxy group, phenol group, carboxyl group, sulfuric acid group, phosphate group, pyrophosphate group, etc. These groups determine the characteristics and functions of titanate coupling agents. For example, sulfonic acid groups give certain thixotropy, pyrophosphoric acid has flame retardancy, rust prevention, increased adhesion, and phosphite coordination groups have antioxidant functions. Through the selection of this part of the group, the titanate coupling agent can have multiple functions.
Functional area 4-R is a long-chain entangled group. Long aliphatic carbon chains are relatively soft, can be bent and wound with organic base materials, enhance the binding force with base materials, improve their compatibility, improve the melting fluidity and processing performance of inorganic fillers, pigments and base materials systems, shorten the mixing time, increase the filling amount of inorganic fillers, and give flexibility and stress transfer functions, thereby improving extension, tearing and impact strength.
Functional area 5 -- Y is the curing reaction group. When the active group is linked to the organic framework of titanium, the titanate coupling agent and the organic polymer can be crosslinked by chemical reaction. For example, unsaturated double bonds can be crosslinked with unsaturated resins to combine inorganic fillers, pigments and organic bases.
Functional area 6-N is the number of non-hydrolyzed groups. The number of non-hydrolyzed groups in the titanate coupling agent has at least two or more. There are 2 or 3 non-hydrolyzing groups in chelated titanate coupling agent; there are 3 non-hydrolyzing groups in monoalkoxy titanate coupling agent. Due to the action of multiple non-hydrolyzing groups in the molecule, the winding can be strengthened, and the surface energy can be drastically changed due to the large number of carbon atoms, which greatly reduces the viscosity of the system.
Last Update：2024-04-10 22:29:15
TMC-311W - Monoalkoxytitanate coupling agent
Titanate coupling agents can be divided into 3 types according to their chemical structure: mono-alkoxy type, chelating type and coordination type.
Monoalkoxy titanate coupling agent has the most varieties, with various functional groups and characteristics, a wide range of applications, moderate prices, widely used in plastics, rubber, coatings, adhesive industry.
The appearance of this product is wine red viscous liquid, pH 3, decomposition temperature 260 ℃, density 0.976 g/cm ~((3), flash point 178 ℃, refractive index 1.447. It is easy to hydrolyze when exposed to water and is soluble in organic solvents.
(1) Monoalkoxy titanate coupling agent has good compatibility with semi-polar materials, plays the role of intermolecular bridge, can improve the mechanical strength of composite materials, can significantly improve the various mechanical properties of composite materials, can be used for surface treatment of calcium carbonate, talc, pigments and other inorganic materials, increase the amount of filler, reduce the amount of resin, thereby reducing the cost of composite materials.
(2) Monoalkoxy titanate coupling agent has obvious effect in polypropylene, polyethylene and other resins, which can enhance the impact strength, toughness and corrosion resistance of products, increase fluidity, and thus improve the processing performance of products.
(3) When the monoalkoxy titanate coupling agent is used in magnetic materials, the magnetic powder treated by the coupling agent can have better dispersibility in the resin, which can increase the filling amount of the magnetic powder and increase the magnetic material The fluidity of the product strengthens the toughness of the product and improves the quality of the magnetic product.
The following figure shows the mechanism diagram of the interaction between monoalkoxy titanate coupling agent and inorganic powder
Last Update：2024-04-10 22:29:15
TMC-311W - Pyrophosphate titanate coupling agent
the appearance of pyrophosphate titanate coupling agent product is translucent yellow viscous liquid, pH 2, decomposition temperature 210 ℃, density 1.050g/cm3, flash point 130 ℃, refractive index 1.465. This kind of variety has better water resistance than general monoalkoxy titanates. It is suitable for surface treatment of inorganic powders with medium water content, but it has worse water resistance than chelated titanates. It has a wide range of applications in coatings, which can significantly improve the dispersibility, anti-settling and storage stability of carbon black, phthalocyanine blue, iron red, medium chrome yellow and other pigments in the base material, and shorten the number of grinds And time, improve the adhesion and appearance quality of the coating film, and have the effects of flame retardant, corrosion resistance, increased adhesion and catalytic curing.
This product can improve the mechanical strength of composite materials and improve the compatibility of inorganic fillers and resins. It mainly treats polyvinyl chloride, polyamide and other resins filled with inorganic materials such as calcium carbonate, talc, and pigments, and increases the number of filler added. Reduce the amount of resin and reduce the cost of composite materials. When used in rubber products, it can improve the tear strength, elongation at break, tensile strength, and increase the fluidity and aging resistance of the material. Used in coatings, it can reduce the viscosity of the system, increase the amount of solid filling, increase the leveling, and give the coating good wear resistance and corrosion resistance. In addition, pyrophosphate titanate coupling agent can also be used to fill Al(OH)3 with glass fiber reinforced polyester glass fiber reinforced plastic to improve the flame retardancy of products.
The following figure shows the moisture absorption mechanism of pyrophosphate titanate coupling agent
Last Update：2024-04-10 22:29:15
TMC-311W - Coordination coupling agent
The coordination coupling agent uses more than 2 phosphites as ligands to move the lone pair of electrons on the phosphorus atom to the titanium atom in the titanate to form 2 valence bonds. Taking OTDLPI-46(KR-46) as an example, its molecular structure is:
Coordination coupling agent OTDLPI-46(KR-46)
It can be seen from the above formula that the titanium atom changes from a 4-valent bond to a 6-valent bond, which reduces the reactivity of the titanate and improves the water resistance. Therefore, the coordination titanate coupling agent has good water resistance and can be used in solvent-based coatings or water-based coatings. Most of the coordination titanate coupling agents are not dissolved in water. They can be directly ground at high speed to emulsify and disperse in water. Surfactants or hydrophilic co-solvents can be added to disperse them in water to surface treatment of inorganic powder.
Last Update：2024-04-10 22:29:15
TMC-311W - Chelating coupling agent
American KENRICH Company divides chelated titanate coupling agent into two systems. One system is a product containing oxyacetic acid chelate group, which is called chelating 100 type; The other is a product containing ethylene glycol chelating agent, which is called chelating 200 type.
Chelating titanate has good water resistance and high hydrolytic stability. It can be applied to the surface treatment of inorganic powders in very humid filler systems, such as wet precipitation of silica, talcum powder, glass fiber, and reinforced carbon black.
(1) chelating 100 type. Take bis (octyl pyrophosphate) hydroxyacetate titanate CTDPP-138S(KR-138S) as an example. It has the same corrosion resistance, flame retardancy and good adhesion characteristics as TTOPP-38S, and has better water resistance than TTOPP-38S. It can be dissolved in toluene, xylene and other solvents coated with modified inorganic powder, also can be alkanolamine or amine reagent quaternary ammonium salt dissolved in water coated with modified inorganic powder. Commonly used amine reagents include 2-dimethylamino-2-methyl-1-propanol (DMAMP-80), triethanolamine, triethylamine, etc.
(2) chelating 200 type. Take bis (dioctyl phosphate) ethylene (alcohol) titanate ETDOP-212S(KR-212S) as an example. This type of titanate has good water resistance and can be dissolved in organic solvents to coat modified inorganic powder. It can also be quaternized with alkanolamine or amine reagents and dissolved in water to modify inorganic powder.
Last Update：2024-04-10 22:29:15
TMC-311W - Usage and Precautions
The dosage of titanate coupling agent is to make all isopropoxy groups in the titanate coupling agent molecule react with hydroxyl groups or protons provided by the surface of inorganic powder. Excessive amount is not necessary. The approximate dosage of titanate coupling agent is 0.1% ~ 3.0% of the dosage of filler or pigment. The finer the particle size of the treated filler or pigment, the larger the specific surface area, the greater the amount of titanate coupling agent. The most appropriate amount can be obtained by viscosity determination method; high melting point polymers usually use low molecular weight liquids, such as mineral oil instead of model tests. The amount of titanate is determined from 0, 0.25%, 0.5%, 0.75%, 1.0%, 1.5%, 2.0% and 3.0% of filler quality. The biggest drop in viscosity is the amount of more suitable titanate coupling agent.
The titanate coupling agent should pay special attention to the following issues during use:
(1) Strictly control the temperature and prevent the decomposition of titanate coupling agent.
(2) Try to avoid using additives with surfactants, because they will interfere with the coupling reaction of titanate coupling agents on the interface. If these additives must be used, these additives should be added after the inorganic powder, coupling agent and polymer base are fully mixed.
(3) Most titanate coupling agents can undergo transesterification with ester plasticizers to varying degrees. Therefore, the dosing sequence should be careful to avoid contact with ester plasticizers first to avoid side reactions and failure.
(4) Pay attention to uniform dispersion. Only the uniform dispersion of titanate coupling agent and the uniform action with inorganic powder particles can achieve uniform coating modification and reduce the amount of titanate coupling agent.
(5) Pay attention to the combination of technology to improve the coupling effect. For example, the combination of titanate coupling agents and other surface modifiers can produce synergistic effects and reduce modification costs.
Last Update：2024-04-10 22:29:15
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Product Name: Titanate coupler Request for quotationTel: 15335994747
Email: 3521670276@qq.com
Mobile: 15335994747
QQ: 3521670276
Wechat: A2020071098
Spot supply
Product Name: Titanate coupler Request for quotationTel: 15335994747
Email: 3521670276@qq.com
Mobile: 15335994747
QQ: 3521670276
Wechat: A2020071098
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