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Preparation method of low-VOC bonding resin

A technology for bonding resin and tackifying resin, applied in the direction of adhesive types, graft polymer adhesives, polymer adhesive additives, etc., can solve the problem of low VOC content, high VOC content, affecting performance and Safety performance and other issues, to achieve the effect of concise process route and improved efficiency

Active Publication Date: 2018-09-18
NINGBO NENGZHIGUANG NEW MATERIALS TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the VOC content of the existing adhesive resin used for automobile plastic fuel tanks is high, which affects its performance and safety performance, the purpose of the present invention is to provide a method for preparing an adhesive resin with low VOC content. The adhesive resin prepared by the method is The VOC content of the composite resin is low, and the bonding strength with the EVOH layer is improved, and it has good fluidity and aging resistance, thereby improving the performance and safety performance of automotive plastic fuel tanks

Method used

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  • Preparation method of low-VOC bonding resin
  • Preparation method of low-VOC bonding resin
  • Preparation method of low-VOC bonding resin

Examples

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Effect test

Embodiment 1～6

[0024] A preparation method of an adhesive resin with low VOC content, comprising the following steps:

[0025] (1) 75g of linear low-density polyethylene, 0.1g of maleic anhydride, 0.01g of 2,5-dimethyl-2,5 bis(tert-butylperoxy)hexane, 1g of C5 petroleum resin and ethylene-butylene 1 g of ethylene copolymer grafted maleic anhydride is mixed in proportion, then sent into a twin-screw extruder for melting, shearing, dehydration and drying after granulation and cooling to obtain the nascent adhesive resin;

[0026] (2) Send the adhesive resin into the supercritical device, pass through the purification solvent, first pressurize to 7-45MPa, then heat to convert the purification solvent into a supercritical fluid, and keep it in the supercritical state for 40min, and then remove it pressure, repeat the above step of pressurizing and heating 5 times, remove the VOC substances in the adhesive resin, and obtain the adhesive resin with low VOC content.

[0027] Wherein each embodimen...

Embodiment 7～10

[0035] A preparation method of an adhesive resin with low VOC content, comprising the following steps:

[0036] (1) metallocene polyethylene 80g, maleic acid 2.5g, dicumyl peroxide 0.3g, C9 petroleum resin 6g and ethylene-octene copolymer grafted maleic anhydride 5g are mixed in proportion, then sent into bismuth The screw extruder melts, shears, and then granulates, cools, dehydrates and dries to obtain the primary adhesive resin;

[0037] (2) Put the nascent adhesive resin into the supercritical device, add the purification solvent, first pressurize to 7-45MPa, then heat to convert the purification solvent into a supercritical fluid, and keep it in the supercritical state for 20min, and then unload Remove the pressure, repeat the above step of pressurizing and heating 3 times, remove the VOC substances in the adhesive resin, and obtain the adhesive resin with low VOC content. Wherein the purification solvent, pressure and temperature used in each embodiment are shown in Tab...

Embodiment 11～13

[0044] A preparation method of an adhesive resin with low VOC content, comprising the following steps:

[0045] (1) 28.5g of medium-density polyethylene, 66.5g of ultra-low-density polyethylene, 5g of maleic anhydride, 0.5g of dibenzoyl peroxide, 10g of hydrogenated C5 petroleum resin and ethylene-octene copolymer grafted horse 10 g of toric anhydride is mixed in proportion, then sent into a twin-screw extruder for melting, shearing, granulation, dehydration and drying after cooling to obtain the nascent adhesive resin;

[0046] (2) Send the nascent adhesive resin into a supercritical device, pass in a purification solvent and add an entrainer, first pressurize to 7-45MPa, heat to convert the purification solvent into a supercritical fluid, and keep it in a supercritical state for 10 minutes , Then the pressure is removed, and the above-mentioned pressurization and heating steps are repeated twice to obtain an adhesive resin with low VOC content. The purification solvent, ent...

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Abstract

The invention relates to the technical field of bonding resins, and concretely relates to a preparation method of a low-VOC bonding resin. The preparation method comprises the following steps: preparing a primary bonding resin from a matrix resin, a graft monomer, an initiator, a tackifying resin and a functional assistant through a double screw extruder, feeding the primary bonding resin into a supercritical device, and removing VOCs from the primary bonding resin by a purifying solvent to obtain the low-VOC bonding resin, wherein the purifying solvent is one or more of carbon dioxide, 1,1,1,2-tetrachloroethane, methane, ethane, propane, ethylene and propylene. The supercritical fluid purification of the primary bonding resin in the method greatly reduces the content of the VOCs in orderto effectively improve the use performance and the safety performance of an automobile plastic fuel tank; and the preparation method has the advantages of environmentally-friendly and efficient preparation process, and simple process route, and the tackifying resin and the functional assistant can improve the flowability, the adhesion and the aging resistance of the bonding resin.

Description

technical field [0001] The invention relates to the technical field of adhesive resins, in particular to a method for preparing an adhesive resin with low VOC content. Background technique [0002] Compared with traditional metal fuel tanks, automotive plastic fuel tanks have obvious advantages. At present, the utilization rate of domestic small passenger cars has exceeded 75%. Among them, the mainstream plastic fuel tank is a high-barrier multi-layer composite plastic fuel tank, which consists of the following six layers from the inside to the outside: HDPE / adhesive layer / EVOH (or PA) / adhesive layer / recycled HDPE / HDPE, adhesive layer It is formed by bonding the adhesive resin to overcome the huge difference in polarity between HDPE and EVOH materials, in which the adhesive resin and HDPE form a permanent bond through molecular-level diffusion, mixing and entanglement, and the adhesive resin and EVOH react chemically , polar interaction and melt-diffusion bonding. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J151/06C09J11/08C08F255/02C08F222/06C08F6/28
CPCC08F6/28C08F255/02C08L2205/025C08L2205/03C09J11/08C09J151/06C08F222/06C08F222/02C08L51/08C08L57/02C08L51/06Y02P20/54
Inventor 贾静璇陈波张祥洲赵平李威威程斌君张发饶
Owner NINGBO NENGZHIGUANG NEW MATERIALS TECH
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