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Vinyl chloride-vinylidene chloride (VDC)/acrylic acid (AA)/methyl methacrylate (MMA)/acrylonitrile (AN) copolymerized polyvinyl dichloride (PVDC) emulsion and preparation method thereof

An emulsion and copolymerization technology, which is applied in the field of VDC/AA/MMA/AN copolymerized PVDC emulsion and its preparation, can solve the problems of discoloration and poor thermal stability of products, and achieve the effects of good elasticity, good water resistance and good compatibility

Inactive Publication Date: 2013-07-10
NANTONG REPAIR AIR CHEM BIOENG
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Problems solved by technology

The disadvantage is poor thermal stability. It is easy to decompose and release hydrogen chloride at the processing temperature to form olefin chains, resulting in discoloration of the product. At the same time, these olefin chains form many cross-linked network structures. This structure is insoluble in any solvent and difficult to melt.

Method used

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  • Vinyl chloride-vinylidene chloride (VDC)/acrylic acid (AA)/methyl methacrylate (MMA)/acrylonitrile (AN) copolymerized polyvinyl dichloride (PVDC) emulsion and preparation method thereof
  • Vinyl chloride-vinylidene chloride (VDC)/acrylic acid (AA)/methyl methacrylate (MMA)/acrylonitrile (AN) copolymerized polyvinyl dichloride (PVDC) emulsion and preparation method thereof

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Embodiment

[0024] Raw material and content:

[0025]

[0026]

[0027] The specific operation process: first add 2230 kg of deionized water, a small amount of co-reducing agent, 15 kg of sodium alkane sulfonate and 2.885 kg of organic hydrogen peroxide into the reactor to fully replace the air inside with nitrogen, and inhale 10% of the mixed Monomer, then heat up, add initiator A and B solutions when the temperature rises to 30°C, when the temperature rises to 55°C, when the pressure drops significantly, the remaining mixed monomers are continuously added to the In the reaction kettle, keep the temperature at 50-55°C at the same time, control the injection time of the mixed monomer to 7 hours, and the injection time of the initiator to 8 hours. After the addition of the mixed monomer, continue to add the initiator for 1 hour. At this time, the pressure will drop to a certain level and remain unchanged. After the pressure remains unchanged for 30 minutes, stop adding the initiator,...

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Abstract

The invention relates to a vinyl chloride-vinylidene chloride (VDC) / acrylic acid (AA) / methyl methacrylate (MMA) / acrylonitrile (AN) copolymerized polyvinyl dichloride (PVDC) emulsion and a preparation method thereof. The emulsion consists of the following components according to parts by weight: 90-96 parts of a vinylidene chloride monomer, 1-2 parts of an acrylic monomer, 4-5 parts of acrylonitrile, 3-4 parts of a methyl methacrylate monomer, 0.2-0.3 part of am initiator, 1-2 parts of an emulsifier, 90-100 parts of a dispersant and 0.0001-0.0002 part of a pH regulating agent. According to the emulsion, the content of the vinylidene chloride monomer is increased, so that a good water resistance is guaranteed after drying latex, and acrylate soft monomer is added to guarantee a certain softness of processed fabric. A thin film coated by the emulsion disclosed by the invention is comparatively hard, and has good elasticity and barrier property; and in addition, the aqueous latex disclosed by the invention, in comparison with acrylic emulsion, has a good solubility, and has a quite excellent modification effect by combining with an acrylic emulsion-type processing agent.

Description

technical field [0001] The invention relates to a VDC / AA / MMA / AN copolymerized PVDC emulsion and a preparation method thereof. Background technique [0002] The main component of polyvinylidene chloride (PVDC for short) is vinylidene chloride (VDC). Due to its symmetrical molecular structure and the presence of hydrophobic chlorine, it has high crystallinity and melting point, and is water-resistant and oxygen-resistant. The performance is good, and the gas barrier property is not affected by the ambient humidity. It is widely used in food, medicine, military industry and other fields. The disadvantage is that the thermal stability is poor, and it is easy to decompose and release hydrogen chloride at the processing temperature to form olefin chains, resulting in discoloration of the product. At the same time, these olefin chains form many cross-linked network structures, which are insoluble in any solvent and difficult to melt. [0003] PVDC is made by copolymerization of vi...

Claims

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Application Information

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IPC IPC(8): C08F214/08C08F220/06C08F220/44C08F220/14C08F2/30C08F2/26
Inventor 姚炎华朱鹏葛亮孙玉蓉
Owner NANTONG REPAIR AIR CHEM BIOENG
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