The invention discloses a polymer type phosphorus-nitrogen intumescent flame retardant and a preparation method therefor, and relates to a chemical synthetic agent and a preparation method therefor. The polymer type phosphorus-nitrogen intumescent flame retardant is prepared from the following raw materials: diethylamine, phosphorus oxychloride and hexamethylene diamine. The preparation method for the flame retardant comprises the following steps: step one, reacting diethylamine with phosphorus oxychloride (POCl3) under certain conditions to generate a phosphorus-containing and nitrogen-containing intermediate diethylphosphoramidic dichloride; step two, reacting the diethylphosphoramidic dichloride with hexamethylene diamine for a certain period of time under the introduction of an inert gas, and obtaining a faint yellow sticky liquid through filtering, washing, drying and the like of a product. The compound has relatively high expansibility and a high char yield, and can be used for a plurality of polymers as an additive or reaction type flame retardant to improve the flame retardant property of the polymer material. The polymer type phosphorus-nitrogen intumescent flame retardant is simple in process production condition, relatively high in product purity and yield, simple and convenient in after-treatment process, and has development potential.

Polymeric type phosphorus and nitrogen intumescent flame retardant and preparation method therefor

Polymerization inhibitor compositions are provided. The polymerization inhibitor compositions may include at least one hydroxylamine of a nitroxide and at least one phenylenediamine. Methods of inhibiting the unwanted polymerization of monomers are also provided. The methods include adding the presently disclosed polymerization inhibitor compositions to a fluid containing the monomers. The monomers may be ethylenically unsaturated monomers, such as acrylic acid, methacrylic acid, acrylonitrile, methacrylonitrile, acrolein, methacrolein, acrylate, methacrylate, acrylamide, methacrylamide, vinyl acetate, butadiene, ethylene, propylene, and styrene.

Nitroxide hydroxylamine and phenylenediamine combinations as polymerization inhibitors for ethylenically unsaturated monomer processes

The invention provides a halamine antibacterial agent, its preparation method and application. The halamine antibacterial agent is a compound with a structure shown in formula (I). The preparation method consists of: in the presence of an acid-binding agent, taking cyanuric chloride or cyanuric fluoride or their derivative, and 2, 2, 6, 6-tetramethyl-4-piperidinol as synthesis raw materials to prepare a halamine antibacterial agent precursor with a structure shown in formula (II), and then reacting the precursor with a sodium hypochlorite solution to prepare a halamine antibacterial agent finished product. The halamine antibacterial agent can be applied in textile antibacterial finishing. Specifically, a textile to be treated is dipped in a finishing solution containing the halamine antibacterial agent precursor and a metal salt catalyst for finishing, and finally a halogenation reaction is carried out so as to obtain an antibacterial textile. The method provided in the invention for preparation of the halamine antibacterial agent has the advantages of low cost, simple process, low reaction temperature, no toxicity or pollution, and is in line with the requirements of ecological textile antibacterial finishing. According to the invention, the application process has the characteristics of simple operation and low reaction energy consumption, and antibacterial textiles with good antibacterial properties can be prepared.

Halamine antibacterial agent, its preparation method and application

The invention discloses a low-alkalinity polymeric hindered amine light stabilizing agent and a preparation method thereof. The light stabilizing agent has a structure as shown in a formula I which is described in the specification. The light stabilizing agent has excellent light stabilizing effect, large molecular weight extraction resistance, good compatibility and a wide application scope. Moreover, the invention also discloses a preparation method for the light stabilizing agent. The preparation method has the advantages of simple operation, high product yield, narrow molecular weight distribution, etc.

Low-alkalinity polymeric hindered amine light stabilizing agent and preparation method thereof

The invention provides a preparing method for 3,5-bis(tertiary butyl)-4-hydroxybenzoic acid hexadecane alkyl ester. The preparing method comprises the steps that 3,5-bis(tertiary butyl)-4-hydroxybenzoic acid, cetyl alcohol and a catalyst are added into a reaction vessel, flow of inert gas is introduced, a heat-preserving reaction is carried out at the temperature of 80 DEG C-160 DEG C, TLC tracks and monitors the reaction till the reaction endpoint, and reaction liquid is subjected to after-treatment to obtain 3,5-bis(tertiary butyl)-4-hydroxybenzoic acid hexadecane alkyl ester. By means of the preparing method, it is unnecessary to adopt other solvent, production cost is saved, and waste gas exhaustion of organic solvent is avoided in the synthesis process; the inert gas serves as a water-carrying agent and a protective agent, operation and control are simple, production safety is good, the color of products is improved, and the method has remarkable economic benefits and has remarkable environmental protection significance.

Preparing method for 3,5-bis(tertiary butyl)-4-hydroxybenzoic acid hexadecane alkyl ester

Method for preparing light stabilizer hexadecyl 3,5-di-tert-butyl-4-hydroxybenzoate

The invention discloses a preparation method of 2,2'-methylenebis[6-(2H-benzotriazole-2-yl)-4-tertiary butyl] phenol as an ultraviolet light absorber. The preparation method comprises the following steps of: carrying out diazotization on ortho-nitroaniline, carrying out a coupling reaction on 2,2'-methylenebis(4-tert-butylphenol) and the ortho-nitroaniline subjected to diazotization, and then carrying out a reduction ring-closure reaction to obtain the 2,2'-methylenebis[6-(2H-benzotriazole-2-yl)-4-tertiary butyl] phenol product. According to the preparation method disclosed by the invention, the 2,2'-methylenebis[6-(2H-benzotriazole-2-yl)-4-tertiary butyl] phenol is synthesized by taking the ortho-nitroaniline and the 2,2'-methylenebis(4-tert-butylphenol) as the raw materials, so that the preparation method has the advantages of simple separation and purification processes, short reaction time, high yield of product, high purity of product, low energy consumption, low environment pollution and low cost, and is suitable for large-scale industrial production.

Preparation method of 2,2'-methylenebis[6-(2H-benzotriazole-2-yl)-4-tertiary butyl] phenol as ultraviolet light absorber

The invention discloses a method for preparing a light stabilizer tri(1-cyclohexyloxy-2,2,6,6-tetramethyl-4-oxy-piperidyl)-1,3,5-triazine. The method comprises the following step of: reacting cyanuric chloride, 2,2,6,6-tetramethyl-4-piperidinol and alkali serving as raw materials in the presence of a catalyst to obtain the tri(1-cyclohexyloxy-2,2,6,6-tetramethyl-4-oxy-piperidyl)-1,3,5-triazine. The tri(1-cyclohexyloxy-2,2,6,6-tetramethyl-4-oxy-piperidyl)-1,3,5-triazine is prepared from tri(2,2,6,6-tetramethyl-4-oxy-piperidyl)-1,3,5-triazine, cyclohexane and an oxidant serving as the raw materials, the separation and purification processes are simple, reaction time is short, the yield of the product is over 95 percent, the purity of the product is high, energy consumption is low, environmental pollution is light, cost is low, and the method is an ideal process for implementing industrial production.

Method for preparing light stabilizer tri(1-cyclohexyloxy-2,2,6,6-tetramethyl-4-oxy-piperidyl)-1,3,5-triazine

Preparation method of light stabilizer tris(2,2,6,6-tetramethyl-4-oxy-piperidyl)-1,3,5-triazine

The invention discloses a preparation method of a light stabilizer intermediate acrylic acid (2'-chloroethyl) ester. According to the invention, acrylic acid and 2-chloroethanol are used as raw materials to react in the presence of a catalyst and a solvent to prepare acrylic acid (2'-chloroethyl) ester. The synthesis of acrylic acid (2'-chloroethyl) ester has advantages of simple separation and purification process, short reaction time, high purity of the product, less energy consumption, less environmental pollution and low cost, and is an ideal technology for realizing industrial production. By the adoption of the preparation method, the product yield can reach over 91%.

Preparation method of light stabilizer intermediate acrylic acid (2'-chloroethyl) ester

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