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04
2020-11
Wholesale price from a methyl MQ silicone resin manufacturer
A white or pale yellow powder, with an M:Q ratio of 0.6–0.9:1. It exhibits excellent heat and low‑temperature resistance, moderate flexibility, good film‑forming properties, water repellency, favorable adhesion, and superior release characteristics. It can be used to formulate high‑temperature‑resistant coatings, water‑repellent agents, mold release agents, tackifiers for pressure‑sensitive adhesives, reinforcing agents for silicone rubbers, defoamers, epoxy adhesives, and more.
2020-11-04
04
2020-11
Bactericidal, mold-inhibiting, and preservative—direct sales from a Jiangsu manufacturer.
I. Technical Specifications: Appearance: Amber‑colored, transparent liquid Density: 1.06–1.18 g/mL Active ingredient: ≥5% pH: 2.0–3.0 II. Dosage: 1. Adjust the dosage appropriately based on the microbial count in the production environment, seasonal climatic conditions, water source, raw materials, and other factors; the typical concentration of the preservative is 0.5–2‰. 2. In the application medium, a recommended dosage of 1–2.5‰ is suggested. III. Applications: This product is widely used in coatings, white latex adhesives, glues, agrochemicals, metal cutting fluids, beer label adhesives, printing pastes, inks, dyes, color pastes, printing auxiliaries, textile auxiliaries, paraffin liquids, wood processing, leather tanning, metal cleaning solutions, water treatment, and other industries.
2020-11-04
15
2020-06
Reinforcing filler for silicone rubber
Silicone rubber is a type of specialty synthetic rubber—a linear polysiloxane polymer with a Si–O–Si backbone—exhibiting outstanding properties such as heat resistance, cold resistance, ozone resistance, radiation resistance, electrical insulation, and biocompatibility. It has found widespread applications across numerous industries, including aerospace, electrical and electronic engineering, chemical instrumentation, automotive, and mechanical engineering, as well as in medical and healthcare fields and everyday life. Due to the high molecular flexibility of raw silicone rubber and weak intermolecular interactions, its mechanical strength is very low (not exceeding 0.4 MPa), rendering it practically useless without reinforcement. Adding reinforcing fillers is therefore the primary approach to enhancing its physical and mechanical properties. After reinforcement, the crosslinking structure of silicone rubber becomes more complex, leading to a significant increase in strength. The most commonly used reinforcing filler for silicone rubber is precipitated silica (5102), which also delivers the best reinforcement effect. Today, there are over thirty commercially available grades of precipitated silica specifically formulated for dimethyl‑based liquid silicone rubbers, with manufacturers including Degussa, Wacker, CABOT, and Shenyang Chemical Plant. Based on their preparation methods, precipitated silicas can be broadly classified into gas‑phase silica and precipitation‑method silica. However, regardless of the type, compatibility issues persist: the addition of these fillers often causes a sharp rise in compound viscosity. When high flowability and transparency are required, precipitated silica proves inadequate as a filler. While precipitated silica markedly improves the mechanical properties of rubber, silicone compounds reinforced with this filler tend to exhibit reduced transparency. Moreover, as the amount of precipitated silica increases, the compound’s viscosity rises sharply, complicating processing and adversely affecting subsequent manufacturing steps, thus failing to meet the demands of products that require both high strength and good fluidity. In such cases, using MQ resin as a reinforcing agent offers a superior alternative. MQ resin demonstrates excellent dispersibility and compatibility within silicone rubber and can achieve reinforcement through chemical bonding with the polymer matrix. Compared with precipitated silica, MQ resin possesses the following advantages: (1) Composed of both organic and inorganic components, MQ resin closely resembles the basic structural framework of silicone rubber. This unique composition ensures exceptional compatibility; incorporation of MQ resin does not significantly alter the compound’s viscosity. Wang Xinxin conducted a comparative study of MQ resin versus precipitated silica in reinforcing room‑temperature vulcanizing (RTV) liquid silicone rubber, demonstrating that, at comparable mechanical strengths, products reinforced with MQ resin exhibited superior viscosity control and adhesion performance compared to those reinforced with precipitated silica. (2) MQ resin consists of M‑units and Q‑units; by tailoring the substituents attached to the M‑units, MQ resin can be readily modified to suit specific applications. As a reinforcing material, MQ resin can be used alone or blended with other fillers. Factors influencing its reinforcing effectiveness include the M/Q ratio and the types of functional groups present. The M/Q ratio determines the compatibility between MQ resin and silicone rubber, while the nature of the functional groups affects the strength of the chemical bonds formed between them, thereby impacting the overall mechanical performance of the silicone rubber.
2020-06-15
15
2020-06
Domestic Business Department
13770937137(Ms. Ge)
No. 5, Lingxiao Road, Lukou Subdistrict, Jiangning District, Nanjing City
Foreign Trade Department