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Ultra-branched polymer used as polythene processing auxiliary agent and synthetic method

A technology of hyperbranched polymers and processing aids, applied in the field of hyperbranched polymers, can solve the problems of low molecular weight, reduced melt viscosity of ultra-high molecular weight polyethylene, single structure, etc.

Active Publication Date: 2009-10-21
溧阳常大技术转移中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, the hyperbranched polymers used to improve the processing fluidity of polymers in all domestic published patents are polycondensates such as polyesters and polyamides, which have the disadvantages of single structure, low molecular weight, and high cost.
For example, CN1488668 adopts 1%~10% hyperbranched polyester-amide to blend with ultrahigh molecular weight polyethylene with a molecular weight of 1 to 3 million. It is found that the melt viscosity of ultrahigh molecular weight polyethylene can be significantly reduced, but the adopted method is not given. Synthetic method of hyperbranched polymer
However, there are no relevant patents on the use of hyperbranched polymers synthesized by the ATRP method with milder conditions to improve the processing fluidity of polyethylene.

Method used

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  • Ultra-branched polymer used as polythene processing auxiliary agent and synthetic method

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Embodiment 1

[0019] 5.08g (0.0333mol) of p-chloromethylstyrene, 39.96g (0.167mol) of lauryl acrylate, 34.66g (0.3333mol) of styrene, 0.495g (0.005mol) of cuprous chloride, and 1.56 g of bipyridine g (0.01mol) was added to a 250mL round-bottomed flask, and reacted at 110°C for 8 hours under magnetic stirring. Dry under vacuum for 48 hours to obtain the target hyperbranched polymer (HBP), with a yield of 75%. hyperbranched polymer 1 H-NMR chart see attached figure 1 ,according to 1 The H-NMR chart calculates that the molar content of lauryl acrylate structural unit in the copolymer is 30%, which is close to the monomer composition of 31.3% when feeding. The product was measured by gel permeation chromatography (GPC). w，GPC =9.4×10 4 ,M n，GPC =3.4×10 4 , M measured by multi-angle laser light scattering (MALLS) w，MALLS =1.3×10 5 . The absolute weight-average molecular weight measured by light scattering is significantly greater than the relative weight-average molecular weight measur...

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Abstract

The invention relates to a hyperbranched polymer that can be used as a polyethylene processing aid and a synthesis method thereof, in particular to a hyperbranched polymer composed of high-carbon alcohol acrylate and styrene and its use of atom transfer radical polymerization synthetic method. The present invention first synthesizes the hyperbranched polymer (parts by weight) through the following formula: p-chloromethylstyrene 1, styrene 6.84~13.68, lauryl acrylate 7.88~23.64, bipyridine (Bpy) 0.21~0.63, chlorine Cuprous chloride (CuCl) 0.065-0.196, the above components are vacuumized, filled with argon or nitrogen for more than 5 times, sealed and then reacted at 100-130°C for 4-12 hours under magnetic stirring. The product is dissolved in acetone and oxidized Filter through an aluminum column, precipitate in ethanol, and dry under vacuum at 25-40°C for several hours to obtain a hyperbranched polymer. Compared with pure HDPE, the melt viscosity of the present invention is obviously lowered, and the tensile performance test shows that its strength changes little.

Description

technical field [0001] The invention relates to a hyperbranched polymer that can be used as a polyethylene processing aid and a synthesis method thereof, in particular to a hyperbranched polymer composed of high-carbon alcohol acrylate and styrene and its use of atom transfer radical polymerization synthetic method. Background technique [0002] In the past 20 years, hyperbranched polymers (Hyperbranched polymers) have been widely concerned in the polymer academic and industrial circles. It refers to polymers with no obvious main chain in the molecule but rich branched structures and surface functional groups. Hyperbranched polymers have approximately spherical three-dimensional molecular structures, few intermolecular and intramolecular chain entanglements, and low solution and melt viscosities. Therefore, it has broad application prospects in high-solid coatings, drug and catalyst carriers, rubber and plastic processing aids, etc. (Yan D, Prog. Polym. Sci., 2004, 29, 183)...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/16C08K5/3432C08L23/06C08F212/08C08K3/16
Inventor 蒋必彪任强
Owner 溧阳常大技术转移中心有限公司
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