Preparation of water phase suspended swelling graft polypropylene

A polypropylene polymer, swelling grafting technology, applied in the field of preparation of aqueous phase suspension grafted polypropylene polymer, can solve the problems such as the decrease of the molecular weight of the grafted product, the high price of grafted polypropylene, and the deterioration of the mechanical properties of the substrate , to achieve the effects of improved mechanical properties, controllable molecular weight, and compatibilization effect

Inactive Publication Date: 2005-05-11
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the grafted polypropylene synthesized generally adopts the melt reaction extrusion method and the solid-phase bulk grafting method, but the grafting rate of the products of the two methods is not high (less than about 1%), and the molecular weight of the grafted product drops sharply, which affects the strength of the material. Deterioration of the mechanical properties of the base material
During the melting grafting process, maleic anhydride is highly volatile and highly irritating to human eyes, nose, and oral mucosa, and the toxic gas produced is likely to cause environmental pollution
There are also monomers such as unreacted maleic anhydride that are difficult to remove and easily cause yellowing of plastics. For many liquid monomers, it is more difficult to add a large amount of melt to participate in effective grafting reactions. The grafting efficiency of monomers Low, resulting in expensive grafted polypropylene
[0003] "Research on Maleic Anhydride Styrene Double Monomer Grafted Polypropylene" (China Plastics 1999, 013 (001) p31-38; author: Zhou Chunhuai, Yang Junzhong) pointed out that polypropylene is grafted with maleic anhydride polyethylene by melting method Dual monomers, the grafting rate of maleic anhydride increases with the addition of styrene, but the addition of a small amount of styrene can better inhibit the degradation of polypropylene, but not all monomer systems can increase the grafting rate, sometimes also inhibits grafting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1: the influence of reaction temperature on grafting rate

[0040] Take three parts of 90 grams of homopolymerized powder polypropylene by weighing respectively, add 2 grams of maleic anhydride, 10 grams of xylene, 240 grams of H 2 0, 5 gram of calcium carbonate powders add 500 milliliters four mouthfuls of reaction flasks that reflux condenser is equipped with, be warming up to respectively specified temperature in table 1, every part respectively adds 1 gram of dibenzoyl peroxide (BPO), reacts 1 hour, Filter, wash product, measure grafting rate after drying, the grafting rate under different temperature is as table 1:

[0041] Table 1:

[0042] Reaction temperature, °C 80 90 100

[0043] Grafting rate, % 0.4 0.6 0.9

[0044] It can be seen from Table 1 that the grafting reaction with higher temperature has a higher grafting rate. Elevating the reaction temperature can increase the rate of free radical generation and increase the reactivity of macromolec...

Embodiment 2

[0045] Embodiment 2: the influence of reaction time on grafting rate

[0046] Take four parts of 100 grams of copolymerized powder polypropylene respectively, add 4 grams of maleic anhydride, 15 grams of xylene, 300 grams of H 2 0, 10 grams of talcum powder add 500 milliliters of four-necked reaction flasks that reflux condenser is housed, respectively warming up to 90 ℃, add 2 grams of dibenzoyl peroxide (BPO), filter by the reaction time shown in table 2, Wash the product, measure the grafting rate after drying, and the grafting rate of different reaction times is as table 2:

[0047] Table 2:

[0048] Response time, hours 1.0 3.0 5.0

[0049] Grafting rate, % 1.7 1.9 2.0

[0050] It can be seen from Table 2 that with the prolongation of the reaction time, the monomers and macromolecular free radicals are fully contacted with the prolongation of time, and the grafting rate is improved. Simultaneously, the monomers and free radicals are continuously reduced. No longer imp...

Embodiment 3

[0051] Embodiment 3: the impact of grafting monomer type on grafting rate

[0052] Take by weighing six parts of 80 grams of homopolymerized powder polypropylene respectively, 4 grams of different grafting monomers, as shown in table 3, respectively add 15 grams of toluene, 300 grams of H 2 O, add 5 grams of magnesium oxide powder into 500 milliliters of four-necked reaction flask equipped with a reflux condenser, heat up to 102 ° C, add 3 grams of dicumyl peroxide (DCP), react for 2.5 hours, filter, wash the product, and dry After measuring the grafting rate, the grafting rate of different grafting monomers is as table 3:

[0053] table 3:

[0054] Graft monomer MAH AA MMA ST VAC BA

[0055] Grafting rate, % 1.0 1.2 1.6 1.5 1.3 1.3

[0056] As shown in Table 3, under the same conditions, maleic anhydride (MAH) is not easy to homopolymerize to form branched chains, while other monomers such as acrylic acid (AA) are easily homopolymerized monomers, so the ratio of monomers suc...

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PUM

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Abstract

A preparation method for graft polypropylene polymer by water phase Suspension and Swelling involves: polypropylene powder; graft monomer; water; coated dosage; initiator; and sweller. The process is carried out by: having the temperature of the reactor with uniform mixture of polypropylene powder, water dispersing medium, graft monomer, sweller, coated dosage raised to 80-100deg.C ; stirring it for 1-6 hours after the initiator putted in; then cooling, filtering, washing with clean water and drying. It features: temperate reacting conditions; easily controlling; high rate and high efficiency of grafting; environmental protection. And the polymer is extensive for compatible assistant of high molecular material blend, compound high molecular material for filling, covering material, and printing ink.

Description

(1) Technical field [0001] The present invention belongs to the preparation method of grafted polypropylene high molecular polymer, especially the preparation method of aqueous phase suspension grafted polypropylene polymer that has monomer and polypropylene to participate in the graft synthesis in water dispersion medium, this method The prepared polymer compound can be widely used as a compatibilizing aid for blended polymer materials, filler composite polymer materials, coatings, inks and the like. (2) Background technology [0002] The grafted polypropylene reactive monomer is an ideal phase solvent for improving polyolefins and polar polymers, and can be widely used as a compatibilizing agent for blended polymer materials, filler composite polymer materials, coatings, inks, etc. In addition, grafted polypropylene polymers are also widely used as additives for non-polar polymers to improve the surface spraying and bonding properties of products. At present, the grafted ...

Claims

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Application Information

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IPC IPC(8): C08F2/18C08F255/02
Inventor 邬润德童筱莉
Owner ZHEJIANG UNIV OF TECH
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