Method for preparing hard sandwich cross-linked PVC foam material

A foaming material and sandwich technology, which is applied in the field of foaming material preparation, can solve problems such as limiting process parameters, increasing process control difficulty, affecting acidity, etc., and achieves high toughness, excellent mechanical strength, and improved foaming efficiency.

Active Publication Date: 2017-05-10
JIANGSU YUEKE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In addition, it is also reported that the use of alkaline PVC and hexahydrophthalic anhydride with a K value of 70 can improve production efficiency, but because alkaline PVC affects the acidity of the reaction environment, it increases the difficulty of process control and limits the process parameters.

Method used

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  • Method for preparing hard sandwich cross-linked PVC foam material
  • Method for preparing hard sandwich cross-linked PVC foam material
  • Method for preparing hard sandwich cross-linked PVC foam material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A method for preparing a rigid sandwich cross-linked PVC foam material, adopts the following steps:

[0050] (1) Weigh raw materials by weight: 100 parts of polyvinyl chloride resin, 5 parts of chlorinated polyethylene, 80 parts of isocyanate (MDI), 2 parts of this ionic liquid surfactant, 10 parts of blowing agent, 10 parts of acid anhydride , 3 parts of stabilizer, and AIBN as the initiator, wherein the isocyanate used is 2,2'-dimethyl-3,3',5,5'-triphenylmethane tetraisocyanate, ionic liquid surfactant for the following molecular structure:

[0051]

[0052] Among them, R 1 , R 2 , R 3 , R 4 Respectively H, OH, SH, Me, X is Br, blowing agent is cyclohexane, acid anhydride is maleic acid rod, polysebacic anhydride, a kind of in hexahydrophthalic anhydride, what adopted in the present embodiment is maleic acid rod to acid anhydride. The stabilizer is one of metal stabilizers such as epoxidized oil such as soybean oil, linseed oil, magnesium oxide, calcium-zinc ...

Embodiment 2

[0059] A method for preparing a rigid sandwich cross-linked PVC foam material, adopts the following steps:

[0060] (1) Raw material preparation: Weigh polyvinyl chloride resin, chlorinated polyethylene, isocyanate, ionic liquid surfactant, foaming agent, acid anhydride, stabilizer agent as a raw material, and azobisisobutyronitrile as an initiator, wherein the isocyanate used is 2,4-toluene diisocyanate, and the ionic liquid surfactant has the following molecular structure:

[0061]

[0062] Among them, R 1 , R 2 , R 3 , R 4 Both are H, X is I, the blowing agent is 2,2'-azobisisobutyronitrile, the acid anhydride is polysebacic anhydride, and the stabilizer is magnesium oxide;

[0063] (2) Pre-stirring and heating: Put all the components in the formula into the kneader and mix them evenly. Components do not react chemically;

[0064] (3) Plastic molding: Pour the obtained mixture into the mold, close the mold, pressurize and heat, and the heating temperature is 100°C....

Embodiment 3

[0068] A method for preparing a rigid sandwich cross-linked PVC foam material, adopts the following steps:

[0069] (1) Material preparation: weigh polyvinyl chloride resin, chlorinated polyethylene, isocyanate, ionic liquid surfactant, foaming agent, acid anhydride, stabilizer agent as a raw material, and azobisisobutyronitrile as an initiator, wherein the isocyanate used is 4,4'-methylenebis(phenylisocyanate), and the ionic liquid surfactant has the following molecular structure:

[0070]

[0071] Among them, R 1 , R 2 , R 3 , R 4 Both are H, X is PF 6 , the foaming agent is 2,2'-azobisisobutyronitrile, the acid anhydride is hexahydrophthalic anhydride, and the stabilizer is calcium-zinc complex agent;

[0072] (2) Pre-stirring and heating: Put all the components in the formula into the kneader and mix them evenly. Components do not react chemically;

[0073] (3) Plastic molding: Pour the obtained mixture into the mold, pressurize and heat the mold, and the heating...

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Abstract

The invention relates to a method for preparing a hard sandwich cross-linked PVC foam material. The method comprises the following steps: weighing PVC resins, chlorinated polyethylene, isocyanate, an ionic liquid surfactant, a foaming agent, anhydride and a stabilizer as raw materials, taking azodiisobutyronitrile as an initiator, and adding the components into a kneading machine for uniformly mixing; carrying plasticizing, molding, blank demolding, water vapor demolding and cross-linking, drying in a drying oven, and the like, thereby obtaining the hard sandwich cross-linked PVC foam material. Compared with the prior art, the PVC foam material disclosed by the invention has the advantage that the comprehensive performance is greatly improved.

Description

technical field [0001] The invention relates to a preparation method of a foaming material, in particular to a method for preparing a rigid sandwich cross-linked PVC foaming material. Background technique [0002] Rigid PVC foam products have many advantages, such as fine and uniform cells and excellent mechanical properties. Cross-linked rigid PVC foam is widely used in sandwich composite applications such as wind energy, yachts, sports equipment, railways and aerospace. However, there are still some problems in the process of producing PVC foam materials. For example, due to different production processes, the PVC foam process may cause degradation, long curing time after foaming, and PVC foam products have insufficient toughness and poor mechanical properties. And the color of the product, etc. About the stability of the processing process of cross-linked rigid PVC foam materials. The patent publication reports that adding 3%-15% epoxy components in the formula as a st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/06C08L23/28C08K5/29C08K5/37C08K5/3445C08J9/14C08J9/10B29C39/44
Inventor 李利红周利峰
Owner JIANGSU YUEKE NEW MATERIAL
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