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Continuous polymerization process

一种聚合物、乳液聚合的技术，应用在化学仪器和方法、化学/物理/物理化学过程、化学/物理过程等方向，能够解决易于发生聚沉等问题，达到避免波动问题、提高设备效率的效果

Inactive Publication Date: 2010-07-14
WACKER CHEM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] Disadvantages of discontinuous polymerization processes in which large volume batches containing dispersed polymer particles have to be pumped in circulation are prone to coagulation due to shear forces introduced by the pump

Method used

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  • Continuous polymerization process

Examples

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Embodiment

[0071] In the pre-emulsion reactor VE, 74 kg of hydrolyzed 88 mol% and An aqueous phase of a 20% solution of polyvinyl alcohol having a viscosity of 4 mPa·s, 98 kg of water and an organic phase consisting of 182 kg of vinyl acetate and 50 kg of ethylene were mixed. The pH is adjusted to 4.0 with 50 g of formic acid, 230 g of Brüggolit and 20 g of ferric ammonium sulfate are added. The mixture was heated to 65°C.

[0072] In reactors R2 and R3 each having a volume of 18 liters, 15 kg of an aqueous dispersion of a vinyl acetate-ethylene copolymer comprising 83 wt. % vinyl acetate and 17 wt. 7% by weight has a degree of hydrolysis of 88% by mole and Stabilized with polyvinyl alcohol having a viscosity of 4 mPa·s. The homogenized mixture was fed from the storage vessel VE into the reactor system at a flow rate of 12 kg / h. For this purpose, the mixture is conducted into the tubular heat exchanger R1, after leaving the heat exchanger into the reactor R2 and from there into the...

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Abstract

The invention provides a process for preparing polymers based on vinyl ester, ethylene and optionally further comonomers in the form of aqueous polymer dispersions thereof or of water-redispersible polymer powders by means of free-radically initiated continuous emulsion polymerization and optionally drying of the resulting polymer dispersions, characterized in that the emulsion polymerization is carried out in a cascade comprising at least one upstream heat exchanger and at least two downstream pressurized stirred tank reactors connected in series, such that the conversion on leaving the heatexchanger is at least 10% of the overall polymerization conversion.

Description

technical field [0001] The present invention relates to a process for the preparation of protective colloid-stabilized polymers based on vinyl esters, ethylene and optionally other comonomers as aqueous polymer dispersions or polymers redispersible in water In powder form, the process is carried out by continuous emulsion polymerization and optionally drying the aqueous polymer dispersion thus obtained. Background technique [0002] Protective colloid-stabilized polymers are used in many applications, for example as coatings or adhesives for various substrates, in particular in the form of their aqueous dispersions or water-redispersible polymer powders. Polyvinyl alcohol is usually used as a protective colloid. The use of polyvinyl alcohol is worthwhile since polyvinyl alcohol itself contributes to the strength (eg cohesive strength values ​​in tile adhesives) compared to systems stabilized by low molecular weight compounds (emulsifiers). Currently, preference is given to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F6/00C08F2/22C08F210/02C08F218/04
CPCB01J2219/00092C08F6/003C08F218/08B01J2219/00094B01J19/1862C08F210/02C08L23/0869C08L31/02C08F2/001C08F2/22
Inventor H-P·魏策尔R·布劳恩施佩格
Owner WACKER CHEM GMBH
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