CN103450435A

CN103450435A - Method for preparing wool anti-shrinking agent by using epoxy resin-modified waterborne polyurethane

Info

Publication number: CN103450435A
Application number: CN2013103807018A
Authority: CN
Inventors: 曹月华
Original assignee: Tongxiang Puyuan Woolen Knitting Technology Service Center
Current assignee: Tongxiang Puyuan Woolen Knitting Technology Service Center
Priority date: 2013-08-28
Filing date: 2013-08-28
Publication date: 2013-12-18
Anticipated expiration: 2033-08-28
Also published as: CN103450435B

Abstract

The invention provides a method for preparing a wool anti-shrinking agent by using epoxy resin-modified waterborne polyurethane. The method comprises the following steps of: carrying out a reaction on toluene diisocynate (TDI) and polyethylene glycol (PEG2000) for 2 hours at 75-80 DEG C; cooling to 70-75 DEG C and then adding a chain extender 1,4-butanediol (BDO), and reacting for 1-2 hours; then adding epoxy resin E-44, a hydrophilic chain extender dimethylolpropionic acid (DMPA) and N-methylpyrrolidone, reacting for 3 hours at 65-70 DEG C, and adding an appropriate amount of acetone to control the viscosity of the reaction system; and cooling to 40 DEG C, adding triethylamine to neutralize, emulsifying in normal-temperature water, adding a chain extender ethylenediamine, adding water in the obtained emulsion to prepare aqueous solution in a solid content of 20-30%, thus obtaining the wool anti-shrinking agent. In the method provided by the invention, waterborne polyurethane is modified by epoxy resin, so that the anti-shrinking agent is good in water resistance, weather resistance and film-forming strength; wool after anti-shrinking finishing is scrub-resistant, good in anti-shrinking performance, and soft in hand feel.

Description

A kind of epoxy resin modified aqueous polyurethane prepares the method for wool shrinkproof agent

Technical field

The present invention relates to a kind of preparation method of fabrics for shrinkage agent, particularly a kind of preparation method of wool shrinkproof agent.

Background technology

The scale structure of wool surfaces is a principal feature of wool fiber, and this structure can cause the incorgruous frictional influence of fiber, thereby makes wool fiber have felting property.

The essence of shrink proof finish is the form that changes the wool surface scale, and the restriction wool occurs mutually to tangle.The main shrinkproof technology of chlorination of using in existing industrial production, the method Technology is ripe, shrinkproof result is good, but larger to the damage of wool, can cause the wool fabric mechanical strength to be lost, arrangement process complexity, and the AOX of its release can cause environmental problem.Comparatively speaking, resin method has environmental protection, the advantage such as easy to process, wherein in the molecular chain of aqueous polyurethane sanforzing agent, contain active group, form the polymeric film with cross-linked network structure at wool surface after arrangement, and with wool fiber between produce chemical bond and be connected, therefore there is splendid shrinkproof result, and shrinkproof weather resistance is fine.

Common waterborne blocked polyurethane can rapid osmotic to wool fabric inside, in the even film forming of fiber surface, still, have that solid content is low, shortcomings such as film forming properties, weathering resistance and poor water resistance, affect shrinkproof result.

Summary of the invention

The purpose of this invention is to provide a kind of method that epoxy resin modified aqueous polyurethane prepares the wool shrinkproof agent.

What the present invention will solve is the defects such as film-forming properties, weathering resistance and poor water resistance that existing sanforzing agent exists.

Technical scheme of the present invention is: the invention provides a kind of method that epoxy resin modified aqueous polyurethane prepares the wool shrinkproof agent, at least comprise the steps:

In container, add tolylene diisocyanate (TDI) and polyoxyethylene glycol (PEG2000), be warming up to 75～80 ℃, reaction 2h, be cooled to 70～75 ℃, adds small molecule chain extender BDO (BDO), reacts 1～2h; Add epoxy resin E-44, hydrophilic chain extender dimethylol propionic acid (DMPA) and N-Methyl pyrrolidone, react 3h under 65～70 ℃, and add proper amount of acetone to control the viscosity of reaction system; After being cooled to 40 ℃, add the triethylamine neutralization, emulsification in normal-temperature water, add the quadrol chain extension, obtains epoxy resin modified water-based polyurethane emulsion, adds water and be mixed with the aqua that solid content is 20～30%, can obtain the wool shrinkproof agent.

The mol ratio of described raw material TDI and PEG2000 is 1.5:1～2.0:1, and the weight percent that the weight percent that the weight percent of epoxy resin E-44 is 3%～5%, BDO is 3%～4%, DMPA is 3%～5%.

The beneficial effect that the present invention produces is: in the present invention, use epoxy resin to waterborne polyurethane modified, make this sanforzing agent have preferably water tolerance, weathering resistance and become film toughness, the wool after shrink proof finish is anti-to be washed by rubbing with the hands, and shrinkproof performance is good, soft.

Embodiment

Below in conjunction with embodiment, the invention will be further described.

Embodiment 1

In container, add tolylene diisocyanate (TDI) and polyoxyethylene glycol (PEG2000), both mol ratios are 2.0:1, be warming up to 75～80 ℃, reaction 2h, be cooled to 70～75 ℃, add small molecule chain extender 1,4-butyleneglycol (BDO), the weight percent of BDO is 4%, reacts 1～2h; Add epoxy resin E-44, hydrophilic chain extender dimethylol propionic acid (DMPA) and N-Methyl pyrrolidone, react 3h under 65～70 ℃, the weight percent that wherein weight percent of E-44 is 5%, DMPA is 5%, adds proper amount of acetone to control the viscosity of reaction system; After being cooled to 40 ℃, add the triethylamine neutralization, emulsification in normal-temperature water, add the quadrol chain extension, obtains epoxy resin modified water-based polyurethane emulsion, adds water and be mixed with the aqua that solid content is 20～30%, can obtain the wool shrinkproof agent.

Claims

1. an epoxy resin modified aqueous polyurethane prepares the method for wool shrinkproof agent, it is characterized in that the method at least comprises that to be prepared as follows step as follows: in container, add tolylene diisocyanate TDI and polyoxyethylene glycol PEG2000, be warming up to 75～80 ℃, reaction 2h, be cooled to 70～75 ℃, adds small molecule chain extender 1,4-butyleneglycol BDO, react 1～2h; Add epoxy resin E-44, hydrophilic chain extender dimethylol propionic acid DMPA and N-Methyl pyrrolidone, react 3h under 65～70 ℃, and add proper amount of acetone to control the viscosity of reaction system; After being cooled to 40 ℃, add the triethylamine neutralization, emulsification in normal-temperature water, add the quadrol chain extension, obtains epoxy resin modified water-based polyurethane emulsion, adds water and be mixed with the aqua that solid content is 20～30%, can obtain the wool shrinkproof agent.

2. a kind of epoxy resin modified aqueous polyurethane as claimed in claim 1 prepares the method for wool shrinkproof agent, the mol ratio that it is characterized in that raw material TDI and PEG2000 is 1.5:1～2.0:1, the weight percent of epoxy resin E-44 is 3%～5%, the weight percent that the weight percent of BDO is 3%～4%, DMPA is 3%～5%.