In the early photoresist column report, we introduced in detail the classification of photoresist, downstream applications, domestic and foreign competition models and detailed explanations of domestic photoresist companies. Under the pressure of geopolitics, the independent controllability of the upstream material industry chain of photoresist is more prominent. At present, there is no systematic report on the upstream material of photoresist in the market. Therefore, we launched the photoresist series 2.0 to report the upstream raw materials of photoresist, including monomers, resins, photoinitiators, solvents, etc., to analyze the mainstream raw materials of semiconductor photoresist, study its industry barriers, and analyze the current market competition model. . The purpose of the present invention is to provide mbr integrated device computing. The first step is to use water-soluble persulfate as an initiator to micropolymerize acrylic acid and ester to form an emulsion, and then directly separate the acrylic acid polymer through acid precipitation to directly remove most of the COD. The second step is through the galvanic cell effect of microelectrolysis. The new ecology [H] and flocculation effect further removed part of COD and improved the biochemical properties of wastewater. The third step is to degrade the dissolved organic pollutants remaining in the wastewater through the membrane bioreactor. First, a common safety hazard is fibrosis. Grass silk is easy to become brittle in the environment of ultraviolet radiation, temperature change, acid rain and so on. After weathering and aging, it becomes flocculent or even powder, and the particles are easily inhaled into the respiratory tract and lungs, causing health risks. Grass silk also needs to add a lot of anti-ultraviolet agent, anti-aging agent, coagulant and other formulations. These additives are valuable. Some manufacturers often discount here, and even add secondary recycled materials to reduce costs, thereby greatly reducing the strength, toughness and anti-aging properties of grass silk, shortening the service life, and it is difficult to judge from the appearance.Photoinitiator 651 (BDK) supplier  Analysis of item a, shielding effect is a physical process unrelated to free radical polymerization; item B, self-acceleration effect refers to the phenomenon that the polymerization reaction rate automatically accelerates in the middle of free radical polymerization; item C, conjugation effect refers to the The electronic effect of changing the distribution of π electrons (or P electrons) in the system; D term, the induced decomposition is actually the transfer reaction of free radicals to the initiator, and peroxide is a kind of free radical polymerization initiator. Free radical polymerization: Initiators include azo (AIBN), organic peroxy, inorganic peroxy, redox initiation systems (water soluble and oil soluble). When selecting an initiator, first select the type of initiator according to the polymerization method, and then select the activation energy and appropriate half-life initiator according to the polymerization temperature. Initiators are generally selected with half-life and polymerization time of the same order of magnitude. 2. Ultraviolet lamp: exposed skin to ultraviolet lamp, mild redness, itching, dandruff; severe sunburn or sun keratinization, and even cause skin tumors, cancer, etc. Ultraviolet rays also destroy human skin cells and cause skin aging. The invisible killer silver ion factory, silver ion antibiotic, high-quality silver ion factory, silver ion smelly socks, must be used with care. Two-photon polymerization [3] refers to the process in which materials generate reactive groups after two-photon absorption, resulting in the growth of monomer and oligomer chains, as shown in Figure 1.3.Benzoin Dimethyl Ether Benzoin diethyl ether 2,2-Dimethoxy-2-phenylacetophenone benzil α,α-dimethylacetal Benzoin Dimethyl Ether (DMPA) benzil dimethyl ketal 2,2-Dimethoxy-phenylacetophenone Benzoin dimethyl ether α,α-Dimethoxy-α-phenylacetophenone Benzoin diethyl ether Photoinitiator 651 Photoinitiator BDK 2,2-Dimethoxy-2-phenylacetophenone Photoinitiator 651 Photoinitiator BDK UV-651 PI-BDK DMPA manufacturer  The reactive groups formed by photoinitiators through two-photon absorption are divided into two categories: free radicals and cations. The growth and termination of the polymer chain is the same, except for the different reactive groups generated by the photoinitiator. 6) Honeycomb pitted surface appears on the surface. Generally speaking, there are many forms of structural surface damage, among which honeycomb, pockmarked surface and holes are the most macroscopic manifestations. The main reason is that the surface of the template is not coated with release agent, and the cleaning is not thorough, resulting in uneven surface. Another point is that the vibrating construction is not operated in strict accordance with the corresponding specifications, such as unreasonable mold removal time and particle size, and poor protection. In addition, from the perspective of concrete, the mix ratio and mixing uniformity have a great influence on the surface damage, and the concrete particles around the reinforcement are not uniform, resulting in project quality problems. For more information, please follow the official WeChat account: Construction Engineering Home. However, for coughs caused by lower respiratory tract infections (such as bronchitis, bronchitis, pneumonia, etc.), especially with sticky phlegm that is not easy to cough, sputum medicine (especially sputum solvent) combined with antibiotics, or aerosol-related drug treatment, removes airway secretions , to promote the repair of respiratory mucosa, or have a certain effect, can use phlegm medicine. According to the different application scope, PVC can be divided into general-purpose PVC resin, high-polymer PVC resin and cross-linked PVC resin. General-purpose polyvinyl chloride resin is polymerized by vinyl chloride monomer under the action of an initiator; high-polymer polyvinyl chloride resin refers to a resin added with a chain extender in the polymerization system of vinyl chloride monomer; cross-linked polyvinyl chloride The resin is a resin in which a crosslinking agent containing diene and polyene is added to the vinyl chloride monomer polymerization system. Due to the simple preparation method and wide range of uses, most of the polyvinyl chloride resins circulating in the spot market are general-purpose polyvinyl chloride resins, while highly polymerized and cross-linked polyvinyl chloride resins are generally widely used in special fields.

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