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High-whiteness polyvinyl chloride resin and preparation method thereof

A technology of polyvinyl chloride resin and high whiteness, applied in the field of polyvinyl chloride resin, can solve the problems of low whiteness of polyvinyl chloride resin, achieve excellent thermal stability, improve stability, and run smoothly

Active Publication Date: 2017-06-27
ЦИНХАЙ СОЛТ ЛЕЙК ИНДАСТРИ ГРУП КО ЛТД
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to provide a high whiteness polyvinyl chloride resin and its preparation method, which is used to solve the problem of low whiteness of the polyvinyl chloride resin prepared by the existing preparation method

Method used

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  • High-whiteness polyvinyl chloride resin and preparation method thereof
  • High-whiteness polyvinyl chloride resin and preparation method thereof
  • High-whiteness polyvinyl chloride resin and preparation method thereof

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preparation example Construction

[0039] The present invention provides the following technical scheme: a preparation method of high-whiteness polyvinyl chloride resin, comprising the following steps:

[0040] Step 1: Add vinyl chloride monomer, initiator, dispersant and water into the polymerization kettle, start the polymerization reaction and time it;

[0041] Step 2: When the polymerization reaction time reaches 230-250 minutes, start to measure the pressure drop in the polymerization kettle, and when the pressure drop in the polymerization kettle reaches the set value or the polymerization reaction time reaches 440-460 minutes, add diethylhydroxylamine to compound A terminator is added to terminate the polymerization reaction to obtain a polyvinyl chloride slurry;

[0042] Step 3: stripping and drying the polyvinyl chloride slurry obtained in step 2 to obtain polyvinyl chloride resin.

[0043] The reaction mechanism of suspension polymerization is as follows:

[0044] Suspension polymerization of PVC is...

Embodiment 1

[0087] Such as figure 1 As shown, the present embodiment provides a kind of preparation method of high whiteness polyvinyl chloride resin, comprises the steps:

[0088] Step 1: Coating the Kettle

[0089] In suspension polymerization, there is a phenomenon of sticking to the kettle, which not only affects the heat transfer of the polymerization reaction, but also affects the quality of the product. The present invention uses a kettle coating agent, preferably, NOXOL WSW produced by Italian CIRS company is used to spray on the inner surface and inside of the polymerization kettle The surface of the component is used to inhibit the wall sticking during the polymerization reaction, so that the inner wall surface of the polymerization tank will not stick to the wall even after multiple continuous polymerizations.

[0090] Step 2. Feeding

[0091] Add the corresponding ratio of vinyl chloride monomer, initiator, dispersant and water into the polymerization kettle, heat to the pol...

Embodiment 2

[0117] Prepare PVC resin according to the step in embodiment 1, but proportioning is (by weight) in step 2:

[0118] Ammonium bicarbonate: 12

[0119] Vinyl chloride monomer: 23700;

[0120] Initiator: CNP (50% aqueous solution) 9, EHP (50% aqueous solution) 18;

[0121] Dispersant: HPMC (dry basis) 1.8, 88% PVA (dry basis) 4,

[0122]55% PVA (40% aqueous solution) 3, 72.5% PVA (dry basis) 13;

[0123] Water: 28500.

[0124] In step 3, when the pressure drop in the polymerization tank reaches the set value of 0.10Mpa, 25 parts by weight of diethylhydroxylamine compound terminator are added, wherein the diethylhydroxylamine compound terminator includes 82wt% diethylhydroxylamine , 8wt% stabilizer tribasic lead sulfate and 10wt% antioxidant 1076.

[0125] The pressure and temperature changes after the reaction are shown in Table 2; the whiteness and thermal stability time of the finished PVC resin are shown in Table 3.

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Abstract

The invention discloses a preparation method of high-whiteness polyvinyl chloride resin. The preparation method comprises the following steps: 1, adding a vinyl chloride monomer, an initiator, a dispersant and water into a polymerization kettle, beginning a polymerization reaction and performing timing, 2, measuring a pressure drop in the polymerization kettle when the polymerization reaction time reaches 230-250 min, and adding a diethylhydroxylamine compound terminator to terminate the polymerization reaction to obtain polyvinyl chloride slurry when the pressure drop in the polymerization kettle reaches a set value or the polymerization reaction time reaches 440-460 min, and 3, performing steam stripping and drying on the polyvinyl chloride slurry obtained in Step 2 to obtain the polyvinyl chloride resin. According to the high-whiteness polyvinyl chloride resin and the preparation method of the polyvinyl chloride resin, the whiteness of the polyvinyl chloride resin is higher, stable between 88 and 91, considerably higher than an industrial standard, and very competitive; the thermal stability time is stable between 173 s and 188 s by detection; the thermal stability is excellent.

Description

technical field [0001] The invention relates to the technical field of polyvinyl chloride resin, in particular to a high-whiteness polyvinyl chloride resin and a preparation method thereof. Background technique [0002] Polyvinyl Chloride (PVC for short) is a high molecular compound polymerized by Vinyl Chloride Monomer (VCM for short). PVC resin is a kind of synthetic material that is popular, popular and widely used at present. It has become the second largest general-purpose resin in the world after polyethylene resin, accounting for 29% of the world's total consumption of synthetic resin. . PVC resin is easy to process, and can be processed by molding, lamination, injection molding, extrusion, calendering, blow molding, etc. PVC resin is mainly used to produce plastic soft products such as artificial leather, film, wire sheath, etc. Hard plastic products such as doors, windows, pipes and valves. [0003] Polymerization methods of PVC resin generally include solution p...

Claims

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Application Information

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IPC IPC(8): C08F114/06C08F2/20C08F2/38C08L27/06
CPCC08F2/20C08F2/38C08F114/06C08L27/06C08L2201/08
Inventor 李俊仁包庆山蔡生吉赵云峰初建成演尚前马海峰李红春王海晏武建刚李桂萍王娜
Owner ЦИНХАЙ СОЛТ ЛЕЙК ИНДАСТРИ ГРУП КО ЛТД
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