One-step method for preparing grafted polyolefin wax emulsion

A technology for grafting polyolefin and polyolefin wax, applied in the field of modified polyolefin, can solve the problems of side reactions, difficult separation of products, and inability of PP wax to turn yellow and black.

Inactive Publication Date: 2014-05-07
NINGBO NENGZHIGUANG NEW MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the above-mentioned technology for preparing polyolefin wax emulsion, the polyolefin wax is usually solution-grafted or melt-grafted first, and then emulsified. The solution method requires a large amount of toxic organic solvents such as xyl

Method used

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  • One-step method for preparing grafted polyolefin wax emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Step 1, solid phase grafting reaction

[0064] The reaction kettle used is as figure 1 shown.

[0065] In the autoclave 1 with a high-speed stirrer, 1 kg of polypropylene wax (provided by Klein), 30 g of maleic anhydride, and 15 g of xylene were sequentially added, and the temperature was raised while stirring evenly for 10 minutes to fully mix the raw materials. After adding 20g of the initiator dibenzoyl peroxide (BPO), in order to prevent the sublimation and volatilization of maleic anhydride, the reaction kettle was strictly sealed with a sealing cover 11, and the temperature was continued to rise to 100-130°C, and the reaction was performed at a constant temperature for 1-2 hours.

[0066] Step 2, removal of grafted comonomer and xylene

[0067] After the reaction is finished, cool down to below 40°C, add acetone from the feed port 10 of the reactor, and then fully stir to dissolve free maleic anhydride and a small amount of xylene (playing the role of purify...

Embodiment 2

[0079] Step 1, solid phase grafting reaction

[0080] In an autoclave with a high-speed stirrer, add 1.5kg polypropylene wax (provided by Klein), 50g glycidyl acrylate and 25g xylene in sequence, and stir evenly for 10 minutes while raising the temperature to fully mix the raw materials . After adding 15g of initiator dicumyl peroxide (DCP), continue to heat up to the range of 100-130°C, and react at constant temperature for 1-2 hours.

[0081] Step 2, removal of grafted comonomer and xylene

[0082] After the reaction, cool to below 40°C, add acetone and stir fully to dissolve free glycidyl acrylic acid and a small amount of xylene, and discharge acetone and acrylic acid through the 200-400 mesh filter device installed at the outlet of the reactor. The glycidyl ether grafted polypropylene wax remains in the reactor 1.

[0083] Step 3, emulsification

[0084] After the acetone is fully volatilized, add 300g of emulsifier, 3g of water, 100g of NaOH, and 35g of sodium ...

Embodiment 3

[0087] Step 1, solid phase grafting reaction

[0088] In an autoclave with a high-speed stirrer, add 1.2kg of polypropylene wax (provided by Klein), 43g of methyl methacrylate and 18g of xylene in sequence, and stir evenly for 10 minutes while raising the temperature, so that each raw material is fully mix. After adding 30g initiator dibenzoyl peroxide in batches, continue to heat up to within the range of 100-130°C, and react at constant temperature for 1-2 hours.

[0089] Step 2, removal of grafted comonomer and xylene

[0090] After the reaction is finished, cool to below 40°C, add acetone and stir fully to dissolve free methyl methacrylate and a small amount of xylene, and discharge acetone through the 200-400 mesh filter device added at the outlet of the reactor. The methyl methacrylate grafted polypropylene wax remains in the reactor 1.

[0091] Step 3, emulsification

[0092]After the acetone is fully volatilized, add 330g of emulsifier, 3g of water, 160g of N...

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Abstract

The invention provides a one-step method for preparing grafted polyolefin wax. The one-step method comprises the following steps: grafting a graft comonomer onto a polyolefin wax main chain according to a solid phase graft technology to obtain comonomer grafted polyolefin wax; feeding a resolvent to the comonomer grafted polyolefin wax to resolve unreacted unsaturated polar monomers and dimethyl benzene, removing the resolvent, feeding an emulsifier, pyrosulfite, water and alkali, stirring for mixing, and ensuring the temperature to be any temperature or in any temperature range of 160 DEG C to 180 DEG C for heat-insulating reaction to obtain a grafted polyolefin wax emulsion. The method has the advantages that the consumption of harm resolvent dimethyl benzene, operation time and cost are greatly reduced; compared with those in a common grafted product, free maleic anhydride and dimethyl benzene in the grafted polyolefin wax prepared according to the method are removed more easily and completely.

Description

technical field [0001] The invention relates to a method for modifying polyolefin, in particular to a method for preparing grafted polyolefin wax emulsion. Background technique [0002] Due to its low density, low cost, strong plasticity, and certain corrosion resistance and mechanical strength, polyolefins are used in many fields as films, fibers, and various profiles. However, polyolefins have low polarity and small intermolecular forces. Therefore, polyolefin materials have poor paintability, hydrophilicity, adhesion or compatibility, and poor blending, filling or bonding properties with other materials. [0003] Polyolefin waxes include low-molecular-weight waxy polyolefins, such as polyolefin waxes prepared by metallocene catalysts disclosed in patent CN1206728A, which are more commonly formed by high-temperature oxidation and chain scission of polyolefins. During the oxidation process, carboxylic acid , can provide the polarity of polyolefin, but found in the process ...

Claims

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Application Information

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IPC IPC(8): C08F255/02C08J3/03C08L51/06C03C25/28C08F2/01B01J19/00B01J19/18
Inventor 吴香发
Owner NINGBO NENGZHIGUANG NEW MATERIALS TECH
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