CN104910799A - Rosin polyurethane coating and preparation method thereof - Google Patents

Abstract

The invention discloses a rosin polyurethane coating. A castor oil crosslinked prepolymer is adopted at first, a multifunctional structure in castor oil can endow a polymer with certain crosslinking and improve the crosslinking degree of the polymer to ensure that the interaction force among molecular chains is increased and the movement of the molecular chains is blocked; water molecules cannot enter the molecular chains easily to ensure that the polymer is swollen, and then the water absorbing capacity of a rubber film is reduced; meanwhile, the castor oil is triglycerol of fatty acid, long-chain non-polar fatty acid chains in the molecules of the castor oil ensure that the rubber film has good hydrophobic property and the water absorbing capacity is further reduced; meanwhile, the ester groups in the castor oil have relatively high cohesive energy which can improve the tensile strength of the rubber film; however, ethyl cellulose has relatively good heat resistance and thermo-plasticity, has relatively good compatibility with polyurethane, and can improve the comprehensive performance of the prepolymer; and the polyurethane prepolymer and polysilsesquioxane are subjected to blending modification.

Description

A kind of rosin polyurethane coating and preparation method thereof

Technical field

The present invention relates to a kind of coating, particularly relate to a kind of rosin polyurethane coating and preparation method thereof.

Background technology

Aqueous polyurethane emulsion has the advantages such as adjustable, the excellent sticking power of soft durometer and snappiness, be widely used in coating, tackiness agent and ink area, the synthesis mode of at present comparatively ripe anion aqueous polyurethane mainly by introducing hydrophilic radical and internal emulsification on polyurethane molecular segment, have certain water absorbability after film forming, film forming mechanical property, water tolerance, solvent resistance are poor.Usually cross-linking modified and the composite modified water tolerance and the mechanical property that improve glued membrane can be adopted;

In order to improve the performance such as mechanical property, water tolerance of urethane, reduce production cost simultaneously, the present invention replaces traditional petroleum chemicals polyvalent alcohol with Viscotrol C part, prepare a kind of New Emulsion, making its glue film performance obtain further improvement, is that a kind of renewable resources that utilizes is to prepare the effective ways of environment-friendly type high performance emulsion coatings.

Summary of the invention

The object of the invention just there is provided a kind of rosin polyurethane coating and preparation method thereof.

The present invention is achieved by the following technical solutions:

A kind of rosin polyurethane coating, it is characterized in that this coating is that the component A of 1.7-2:1 and B component form by mass ratio, described component A is made up of the raw material of following weight parts:

Triterpenoid saponin 0.8-1, maleated rosin 5-7, tetramethylolmethane 1-2, calcium aluminate 0.3-0.5, polymethyl acrylate 1-2, short and long-chain acyl triglyceride molecules 2-3, ethyl cellulose 2-3, isophorone diisocyanate 50-67, polycarbonate diol 80-100, polysilsesquioxane 1.6-3, BDO 1.3-2, Diisopropyl azodicarboxylate 0.4-0.9, stannous octoate 0.1-0.17, fluoroboric acid 0.1-0.13, Viscotrol C 10-16;

Described B component is made up of the raw material of following weight parts:

Dimethythiotoluene diamine 3-4, hydrogenated castor oil 0.1-0.2, tributyl citrate 4-6, trolamine 0.7-1, titanium dioxide 4-5.

A preparation method for rosin polyurethane coating, comprises the following steps:

Wherein the preparation method of component A comprises the following steps:

(1) joined by above-mentioned triterpenoid saponin in 10-12 deionized water doubly, add ethyl cellulose after stirring, raised temperature is 60-70 DEG C, stirs, and obtains fibre emulsion;

(2) by maleated rosin, tetramethylolmethane mixing, insulated and stirred 3-6 minute at 70-80 DEG C, adds polymethyl acrylate, send in the oil bath of 100-110 DEG C, insulated and stirred 20-30 minute, discharging after cooling, mix with calcium aluminate, send in colloidal mill and grind evenly, obtain modified rosin;

(3) polycarbonate diol is heated to 100-120 DEG C, reduce pressure the 1-2h that dewaters;

(4) joined by Viscotrol C in the Virahol of 5-10 times of weight, add fluoroboric acid, fibre emulsion under agitation condition, insulated and stirred 1-2 hour at 60-65 DEG C, adds ammoniacal liquor, and regulator solution PH is 8-9, obtains Viscotrol C Inositol nf12 99;

(5) Viscotrol C Inositol nf12 99 is joined in the polycarbonate diol after dehydration, add stannous octoate, add isophorone diisocyanate under agitation condition, pass into nitrogen, add BDO, at 85-90 DEG C, react 1-2 hour, obtain base polyurethane prepolymer for use as;

(6) joined by above-mentioned Diisopropyl azodicarboxylate in 20-30 acetone doubly, stirring, is initiator solution;

(7) above-mentioned base polyurethane prepolymer for use as is mixed with modified rosin, stir 20-30 minute, add polysilsesquioxane, at 80-85 DEG C, drip above-mentioned initiator solution, dropwise rear ultrasonic disperse 10-20 minute, add each raw material of residue, dehydration, cooling discharging, revolves steaming and sloughs acetone, to obtain final product;

The preparation method of described B component comprises the following steps:

By hydrogenated castor oil, tributyl citrate mixing, insulated and stirred 7-20 minute at 60-80 DEG C, adds trolamine, is stirred to normal temperature, adds each raw material of residue, stirs, to obtain final product.

Using method:

First the dust of substrate surface, foreign material are cleaned out, basic unit must be smooth, solid and dry, A of the present invention, B component mixed according to weight ratio, stir, utilize round brush by mixture uniform application in substrate surface.

Advantage of the present invention is:

First the present invention adopts Viscotrol C crosslinking prepolymers body:

Polyfunctional group structure in Viscotrol C can give polymkeric substance certain being cross-linked, improve the crosslinking degree of polymkeric substance, the interaction force between molecular chain is increased, and molecular chain movement is obstructed, water molecules is difficult to enter molecular chain chien shih polymers swell, therefore glued membrane water-intake rate declines;

Viscotrol C is the Witepsol W-S 55 of lipid acid simultaneously, and in its molecule, the nonpolar fatty acid chain of long-chain makes glued membrane have good hydrophobicity, also reduce further water-absorbent;

Ester group simultaneously in Viscotrol C has higher internal cohesive energy, can improve the tensile strength of glued membrane;

And ethyl cellulose has good thermotolerance, thermoplasticity, with urethane, there is good consistency, the over-all properties of performed polymer can be improved;

Then by base polyurethane prepolymer for use as and polysilsesquioxane blending and modifying:

Due to the nanoparticle that polysilsesquioxane is containing Si-O-Si skeleton structure, can the organism of polymeric inner be stoped in the release being oxidized volatile matter in Sum decomposition process further by structure, possess good thermostability and be easy to functionalized simultaneously, can be incorporated in organic matrix well and improve polymer performance, under oxidated condition, also can generate SiO2 be coated on surface, can make material oxygen barrier, heat insulation, cause flame retardant effect to increase;

Rosin polyurethane coating tensile strength of the present invention is large, and adaptable to basic unit's distortion, cost is low.

Embodiment

Below in conjunction with embodiment, the present invention is described in further detail:

Embodiment 1:

A kind of rosin polyurethane coating, it is characterized in that this coating is that the component A of 1.7-2:1 and B component form by mass ratio, described component A is made up of the raw material of following weight parts:

Triterpenoid saponin 0.8, maleated rosin 5, tetramethylolmethane 2, calcium aluminate 0.5, polymethyl acrylate 2, short and long-chain acyl triglyceride molecules 2, ethyl cellulose 2, isophorone diisocyanate 67, polycarbonate diol 100, polysilsesquioxane 1.6, BDO 1.3, Diisopropyl azodicarboxylate 0.9, stannous octoate 0.17, fluoroboric acid 0.13, Viscotrol C 16;

Described B component is made up of the raw material of following weight parts:

Dimethythiotoluene diamine 3, hydrogenated castor oil 0.2, tributyl citrate 6, trolamine 0.7, titanium dioxide 4-5.

A preparation method for rosin polyurethane coating, comprises the following steps:

Wherein the preparation method of component A comprises the following steps:

(1) joined in the deionized water of 12 times by above-mentioned triterpenoid saponin, add ethyl cellulose after stirring, raised temperature is 70 DEG C, stirs, and obtains fibre emulsion;

(2) by maleated rosin, tetramethylolmethane mixing, at 80 DEG C, insulated and stirred 3 minutes, adds polymethyl acrylate, sends in the oil bath of 110 DEG C, insulated and stirred 30 minutes, and discharging after cooling, mixes with calcium aluminate, sends in colloidal mill and grinds evenly, obtain modified rosin;

(3) polycarbonate diol is heated to 120 DEG C, reduce pressure the 2h that dewaters;

(4) joined by Viscotrol C in the Virahol of 10 times of weight, add fluoroboric acid, fibre emulsion under agitation condition, at 65 DEG C, insulated and stirred 1 hour, adds ammoniacal liquor, and regulator solution PH is 9, obtains Viscotrol C Inositol nf12 99;

(5) Viscotrol C Inositol nf12 99 is joined in the polycarbonate diol after dehydration, add stannous octoate, add isophorone diisocyanate under agitation condition, pass into nitrogen, add BDO, react 1 hour at 90 DEG C, obtain base polyurethane prepolymer for use as;

(6) joined by above-mentioned Diisopropyl azodicarboxylate in 20-30 acetone doubly, stirring, is initiator solution;

(7) above-mentioned base polyurethane prepolymer for use as is mixed with modified rosin, stir 20 minutes, add polysilsesquioxane, at 85 DEG C, drip above-mentioned initiator solution, dropwise rear ultrasonic disperse 20 minutes, add each raw material of residue, dehydration, cooling discharging, revolves steaming and sloughs acetone, to obtain final product;

The preparation method of described B component comprises the following steps:

By hydrogenated castor oil, tributyl citrate mixing, at 60 DEG C, insulated and stirred 20 minutes, adds trolamine, is stirred to normal temperature, adds each raw material of residue, stirs, to obtain final product.

Performance test:

Tensile strength 6.0MPa;

Tear strength 21N/mm;

Elongation at break: 570%;

Watertightness: 0.3MPa, 30min: waterproof.

Claims (2)

1. a rosin polyurethane coating, it is characterized in that this coating is that the component A of 1.7-2:1 and B component form by mass ratio, described component A is made up of the raw material of following weight parts:

Triterpenoid saponin 0.8-1, maleated rosin 5-7, tetramethylolmethane 1-2, calcium aluminate 0.3-0.5, polymethyl acrylate 1-2, short and long-chain acyl triglyceride molecules 2-3, ethyl cellulose 2-3, isophorone diisocyanate 50-67, polycarbonate diol 80-100, polysilsesquioxane 1.6-3, BDO 1.3-2, Diisopropyl azodicarboxylate 0.4-0.9, stannous octoate 0.1-0.17, fluoroboric acid 0.1-0.13, Viscotrol C 10-16;

Described B component is made up of the raw material of following weight parts:

Dimethythiotoluene diamine 3-4, hydrogenated castor oil 0.1-0.2, tributyl citrate 4-6, trolamine 0.7-1, titanium dioxide 4-5.

2. a preparation method for rosin polyurethane coating as claimed in claim 1, is characterized in that comprising the following steps:

Wherein the preparation method of component A comprises the following steps:

(1) joined by above-mentioned triterpenoid saponin in 10-12 deionized water doubly, add ethyl cellulose after stirring, raised temperature is 60-70 DEG C, stirs, and obtains fibre emulsion;

(2) by maleated rosin, tetramethylolmethane mixing, insulated and stirred 3-6 minute at 70-80 DEG C, adds polymethyl acrylate, send in the oil bath of 100-110 DEG C, insulated and stirred 20-30 minute, discharging after cooling, mix with calcium aluminate, send in colloidal mill and grind evenly, obtain modified rosin;

(3) polycarbonate diol is heated to 100-120 DEG C, reduce pressure the 1-2h that dewaters;

(4) joined by Viscotrol C in the Virahol of 5-10 times of weight, add fluoroboric acid, fibre emulsion under agitation condition, insulated and stirred 1-2 hour at 60-65 DEG C, adds ammoniacal liquor, and regulator solution PH is 8-9, obtains Viscotrol C Inositol nf12 99;

(5) Viscotrol C Inositol nf12 99 is joined in the polycarbonate diol after dehydration, add stannous octoate, add isophorone diisocyanate under agitation condition, pass into nitrogen, add BDO, at 85-90 DEG C, react 1-2 hour, obtain base polyurethane prepolymer for use as;

(6) joined by above-mentioned Diisopropyl azodicarboxylate in 20-30 acetone doubly, stirring, is initiator solution;

(7) above-mentioned base polyurethane prepolymer for use as is mixed with modified rosin, stir 20-30 minute, add polysilsesquioxane, at 80-85 DEG C, drip above-mentioned initiator solution, dropwise rear ultrasonic disperse 10-20 minute, add each raw material of residue, dehydration, cooling discharging, revolves steaming and sloughs acetone, to obtain final product;

The preparation method of described B component comprises the following steps:

By hydrogenated castor oil, tributyl citrate mixing, insulated and stirred 7-20 minute at 60-80 DEG C, adds trolamine, is stirred to normal temperature, adds each raw material of residue, stirs, to obtain final product.