Preparation process of imitation PU material

A preparation process and technology of PU materials, applied in the field of preparation process of imitation PU materials, can solve the problems of easy occurrence of harmful substances, loss of viscosity, poor weather resistance, etc., and achieve the effect of wide hardness range, outstanding cold resistance, and high mechanical strength

Pending Publication Date: 2022-04-26
张国祥
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Polyvinyl chloride (PVC) is one of the earliest industrialized and widely used general-purpose thermoplastics. It has the advantages of light weight, high strength, insulation, flame retardancy, corrosion resistance, excellent comprehensive performance, low price and wide source of raw materials; but also There are the following disadvantages: poor toughness, easy to be brittle when impacted, poor weather resistance (brittleness, hardening, degumming at sub-zero temperature), used in leather production, prone to harmful substances; easy to squeeze the oil in PVC under low temperature out, loses stickiness and degumming

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0018] A kind of preparation technology of imitation PU material, comprises the following steps:

[0019] Step 1: Pour the powdered hydrogenated styrene and powdered AS resin into a banbury mixer, heat to 70-90°C, then add maleic anhydride, mix and stir evenly, so that the maleic anhydride is mixed with hydrogenated styrene and When the AS resin is heated and mixed, the chemical bond between the AS resin and hydrogenated styrene is interrupted to obtain a mixture A1 of network chemical bonds; wherein, maleic anhydride, powdered hydrogenated styrene and powdered AS resin are 2-5% by mass. : 23-30: 65-75 ratio for mixing and banburying;

[0020] Step 2: Pour A1 into the internal mixer with the temperature set at 130-140°C for banburying again, and add nitrile rubber and hydrogenated styrene at the same time to carry out the second banburying. Through the heating and stirring of this banburying, mix A1 again The reticular chemical bond recombination is dendritic chemical bond an...

Embodiment 1

[0025] A kind of preparation technology of imitation PU material, comprises the following steps:

[0026] Step 1: Pour the powdered hydrogenated styrene and powdered AS resin into the banbury mixer, heat to 70°C, then add maleic anhydride, mix and stir evenly, so that the maleic anhydride is mixed with hydrogenated styrene and AS resin When heating and mixing, the chemical bonds between AS resin and hydrogenated styrene are broken to obtain a mixture of network chemical bonds A1; among them, maleic anhydride, powdered hydrogenated styrene and powdered AS resin are in a mass percentage of 2:23:75 Mixing and banburying in proportion;

[0027] Step 2: Pour A1 into the internal mixer with the temperature set at 130°C for banburying again, and add nitrile rubber and hydrogenated styrene at the same time to carry out the second banburying. Shape chemical bond is recombined into dendritic chemical bond and obtains mixture A2; Wherein, nitrile rubber, hydrogenated styrene and mixture...

Embodiment 2

[0033] A kind of preparation technology of imitation PU material, comprises the following steps:

[0034] Step 1: Pour the powdered hydrogenated styrene and powdered AS resin into a banbury mixer, heat to 90°C, then add maleic anhydride, mix and stir evenly, so that the maleic anhydride is mixed with hydrogenated styrene and AS resin When heating and mixing, the chemical bonds between AS resin and hydrogenated styrene are broken to obtain a mixture of network chemical bonds A1; wherein, maleic anhydride, powdered hydrogenated styrene and powdered AS resin are in a mass percentage of 5:30:65 Mixing and banburying in proportion;

[0035] Step 2: Pour A1 into the internal mixer with the temperature set at 140°C for banburying again, and add nitrile rubber and hydrogenated styrene at the same time to carry out the second banburying. Through the heating and stirring of this banburying, the netting of A1 is mixed again. Shape chemical bond is recombined into dendritic chemical bond...

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Abstract

A preparation process of an imitation PU material comprises the following steps: step 1, firstly pouring powdery hydrogenated styrene and powdery AS resin into an internal mixer, then adding maleic anhydride, and uniformly mixing and stirring to obtain a mixture A1 with net-shaped chemical bonds; 2, pouring A1 into the internal mixer with the temperature set to be 130-140 DEG C in the bin for internal mixing again, and meanwhile, adding nitrile rubber and hydrogenated styrene for secondary internal mixing to obtain a mixture A2; step 3, allowing A2 to stand, recombining the dendritic chemical bond of A2 into a net-shaped chemical bond, and completing grafting to obtain A; and step 4, then putting the final product A into a granulator, and shearing through stirring blades to obtain a finished product. The PU-imitating material prepared by the invention is wide in hardness range, high in mechanical strength, outstanding in cold resistance and good in molding processing performance, has outstanding oil resistance, water resistance, mildew resistance, hydrolysis resistance, high temperature resistance and excellent oxidation resistance, is adjustable in air tightness and air permeability, and is free of VOCs precipitation after being used for a long time.

Description

technical field [0001] The invention belongs to the field of material preparation, and in particular relates to a preparation process of imitation PU material. Background technique [0002] Polyvinyl chloride (PVC) is one of the earliest industrialized and widely used general-purpose thermoplastics. It has the advantages of light weight, high strength, insulation, flame retardancy, corrosion resistance, excellent comprehensive performance, low price and wide source of raw materials; but also There are the following disadvantages: poor toughness, easy to be brittle when impacted, poor weather resistance (brittleness, hardening, degumming at sub-zero temperature), used in leather production, prone to harmful substances; easy to squeeze the oil in PVC under low temperature out, lose its stickiness and degumming. First of all, by changing the ratio of the reactive components of the PU-like material, products with different hardness can be obtained, and with the increase of hard...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L9/02C08L25/12C08L53/02
CPCC08L9/02C08L2201/08C08L25/12C08L53/025
Inventor 张国祥
Owner 张国祥
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