A kind of preparation method of polyvinyl chloride special resin modified by supramolecular quadruple hydrogen bond upy unit

A technology of quadruple hydrogen bond and polyvinyl chloride, which is applied in the field of preparation of supramolecular quadruple hydrogen bond UPy unit modified polyvinyl chloride special resin, which can solve the problem of unstable product quality, cross-linked polyvinyl chloride, cross-linking agent dispersion Inhomogeneity, easy to produce gel particles and other problems, to achieve the effect of easy processing, strong self-aggregation ability, and self-repairing processing

Inactive Publication Date: 2020-05-08
XINJIANG INST OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Through irreversible covalent crosslinking, polyvinyl chloride can improve tensile strength, heat resistance, aging resistance, stress crack resistance and dimensional stability, etc., but it has the following disadvantages: uneven dispersion of crosslinking agent, crosslinking agent It is difficult to control, easy to produce gel particles, unstable product quality and difficult to recycle cross-linked polyvinyl chloride products, etc.
For the modification of PVC resin, the reversible cross-linking modification method of more reversible covalent bonding is Diels-Alder (D-A) reaction, and the preparation of PVC special-purpose resin with non-covalent multiple hydrogen bonds has not been reported yet.

Method used

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  • A kind of preparation method of polyvinyl chloride special resin modified by supramolecular quadruple hydrogen bond upy unit

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] a. Rinse the polymerization kettle clean, add 100% deionized water into the reaction polymerization kettle, start stirring, add dispersant polyvinyl alcohol / hydroxypropyl methylcellulose 0.03%, containing supramolecular quadruple hydrogen bond UPy unit Cross-linking agent is cross-linking agent A0.005%, initiator peroxydicarbonate (2-ethylhexyl) 0.01%, buffering agent ammonium bicarbonate 0.01%, puts on the still lid, vacuumizes and discharges the air in the still, then Press in 100 parts of vinyl chloride monomer, stir for 10 minutes, then heat up to the polymerization temperature of 55°C, keep the temperature constant, and control the reaction time for 6 hours;

[0036] b. When the reaction pressure drops to the control point of 0.15MPa, add 0.01% of the terminator acetone thiosemicarbazone, continue to stir for 10 minutes, and discharge the slurry. The slurry is centrifuged, dried, and sieved to obtain a special resin for modified polyvinyl chloride.

Embodiment 2

[0038]a. Rinse the polymerization kettle clean, add 100% deionized water into the reaction polymerization kettle, start stirring, add dispersant polyvinyl alcohol / hydroxypropyl methylcellulose 0.03%, containing supramolecular quadruple hydrogen bond UPy unit Cross-linking agent is cross-linking agent A0.005%, initiator peroxydicarbonate (2-ethylhexyl) 0.01%, buffering agent ammonium bicarbonate 0.01%, puts on the still lid, vacuumizes and discharges the air in the still, then Press in 100 parts of vinyl chloride monomer, stir for 10 minutes, then heat up to the polymerization temperature of 60°C, keep the temperature constant, and control the reaction time for 8 hours;

[0039] b. When the reaction pressure drops to the control point of 0.15MPa, add 0.01% of the terminator acetone thiosemicarbazone, continue to stir for 10 minutes, and discharge the slurry. The slurry is centrifuged, dried, and sieved to obtain a special resin for modified polyvinyl chloride.

Embodiment 3

[0041] a. Rinse the polymerization kettle clean, add 100% deionized water in the reaction polymerization kettle, start stirring, add dispersant polyvinyl alcohol / hydroxypropyl methylcellulose 0.08%, initiator peroxydicarbonic acid (2-ethyl Acetyl hexyl ester) 0.1%, buffer agent ammonium bicarbonate 0.1%, put on the lid of the kettle, evacuate the air in the kettle, then press 100 parts of vinyl chloride monomer, stir for 10min and then heat up to the polymerization temperature of 55°C, constant temperature, control The reaction time is 7 hours, and the cross-linking agent containing the supramolecular quadruple hydrogen bond UPy unit is continuously and uniformly added into the kettle as the cross-linking agent A 0.01%;

[0042] b. When the reaction pressure drops to the control point pressure, add 0.01% terminator acetone thiosemicarbazone, continue to stir for 10 minutes, and discharge the slurry. The slurry is centrifuged, dried, and sieved to obtain a special resin for modi...

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Abstract

The invention relates to a preparation method of supramolecular quadruple hydrogen-bond ureido-pyrimidinone (UPy) unit modified polyvinyl chloride (PVC) special resin. UPy-containing acrylate crosslinking agents are used for modifying PVC, and UPy-containing styrene crosslinking agents are used for modifying the PVC. Compared with the existing crosslinking agents, the crosslinking agents selectedfor use in the method have the beneficial effects that UPy quadruple hydrogen-bond system can form a self-complementary quadruple hydrogen-bond interaction, and is good in stability, strong in self-polymerization ability and very high in binding constant; furthermore, the strong non-covalent cross-linking effect is reversible and has a self-recovery ability; high molecular polymers are formed by means of self-assembly through the interaction of non-covalent hydrogen bonds; the combination of repeating units is based on the interaction of the hydrogen bonds, so that the repeating units can be separated and recombined under appropriate conditions and are reversible; therefore, the PVC polymer not only has the properties of the traditional polymers, but also has the excellent characteristicsof stimulative responsibility, self-repairing property, easy processing and the like, and can be used as special resin for smart materials and self-healing materials.

Description

technical field [0001] The invention relates to a preparation method of a supramolecular quadruple hydrogen bond UPy unit modified polyvinyl chloride special resin. Background technique [0002] Polyvinyl chloride (PVC) is a polymer material that uses a chlorine atom to replace a hydrogen atom in polyethylene, and is an amorphous polymer with a small amount of crystalline structure. Polyvinyl chloride macromolecular structure exists The unstable structures such as head-to-head structure, branched chain, allyl chloride, and tertiary chlorine make it have disadvantages such as poor thermal deformation resistance and aging resistance. PVC is a linear polymer in which most VCM monomers are connected in a head-to-tail structure, the carbon atoms are arranged in a zigzag shape, all atoms are connected by σ bonds, and all carbon atoms are sp 3 hybridization. Since the molecular chain of PVC resin contains a large number of polar bonds C-Cl bonds, there is a large force between ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F214/06C08F220/36C08F212/32C08F2/20
CPCC08F2/20C08F212/32C08F214/06C08F220/36
Inventor 张亚刚王璐璐吾满江·艾力尹兆明赵永禄王雅玲杨秀玲殷杰郝涛施彦彬
Owner XINJIANG INST OF ENG
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