CN101381447B - Polyurethane resin - Google Patents

Abstract

The invention relates to polyurethane resin, which consists of the following components in weight percentage: 4 to 5 percent of polyethylene glycol adipate, 11 to 13 percent of polytetrahydrofuran glycol, 0.4 to 0.6 percent of ethylene glycol, 1.8 to 1.9 percent of isophorone diamine, 6 to 8 percent of isophorone diisocyanate, 0.08 to 0.1 percent of antioxidant and 73 to 80 percent of organic solvent. The polyurethane resin is applied to produce instep leather of top-grade travel shoes and has good ultraviolet ray yellow stain resistant performance; and under the sunlight, the leather color can be kept unchanged for a long time, and no yellow stain occurs; meanwhile, the polyurethane resin also has good anti freezing property, and no crack generates when the polyurethane resin is used at low temperature for a long time.

Description

A kind of urethane resin

Technical field

The present invention relates to a kind of urethane resin, it is used in particular for not having the production of cold change and cold-resistant lining.

Background technology

The application of urethane resin aspect synthetic leather is mainly reflected in a plurality of fields such as clothes, case and bag, footwear, furniture, automobile, though leather has had the history of decades with the development of urethane resin, but in the face of improving constantly of the market requirement, improved new higher requirement for the urethane resin technology, must possess good cold tolerance as high-grade sneakers upper leather.At present, the many urethane resin cold tolerances that occur on the market are bad, can not satisfy the needs of low temperature life-time service; In addition, xanthochromia takes place in resin leather surface under daylight easily, influences the attractive in appearance of product.

Summary of the invention

Technical problem to be solved by this invention is to overcome the deficiencies in the prior art, and a kind of do not have xanthochromia and the good urethane resin of cold tolerance are provided.

For solving above technical problem, the present invention takes following technical scheme:

A kind of urethane resin, its composition of raw materials is made up of polyester polyol, polyether glycol, chainextender, isocyanic ester, organic solvent and oxidation inhibitor, wherein, polyester polyol is the polyethyleneglycol adipate glycol of molecular weight 2000, polyether glycol is the PTMG of molecular weight 2000, and chainextender is the mixture of ethylene glycol and your ketone diamines of different fluorine, and isocyanic ester is an isoflurane chalcone diisocyanate, in the total mass of urethane resin, the mass content of above-mentioned each component is as follows:

Polyethyleneglycol adipate glycol 4～5%;

PTMG 11～13%;

Ethylene glycol 0.4～0.6%;

Different fluorine that ketone diamines 1.8～1.9%;

Isoflurane chalcone diisocyanate 6～8%;

Oxidation inhibitor 0.08～0.1%;

Organic solvent 73～80%.

Described organic solvent is preferably the mixed solvent of dimethyl formamide and toluene, and wherein the mass ratio of dimethyl formamide and toluene is 1.5～2.0:1.

Above-mentioned urethane resin preferably makes as follows:

(1), synthetic performed polymer: in reactor, add polyethyleneglycol adipate glycol, PTMG, ethylene glycol, oxidation inhibitor, isoflurane chalcone diisocyanate and an amount of organic solvent, solid content is controlled at 70～75%, in 75～85 ℃ of temperature, normal pressure reacted 5～8 hours down, obtained performed polymer;

(2), chain extending reaction: performed polymer is cooled to 38～42 ℃, your the ketone diamines of different fluorine that adds formula ratio carries out chain extending reaction, the temperature of chain extending reaction is 40～50 ℃, under normal pressure, carry out, chain extending reaction obtained viscosity 80～120KCps/25 ℃ in 2～3 hours, the urethane resin of solid content 24～26%.

Because the enforcement of above technical scheme, the present invention compared with prior art has following advantage:

1, selects aliphatic isocyanates for use, avoided using 4,4 ditan 2-isocyanic ester or tolylene diisocyanates, phenyl ring can not occur and under ultraviolet ray, mutation take place and cause the xanthochromic phenomenon of material;

2, the winter hardiness of resin is by the decision of the second-order transition temperature of soft chain segment, select the lower PTMG of second-order transition temperature as main segment, can reduce whole second-order transition temperature, the flexibility that keeps leather surface at low temperatures, the anti-tortuous performance of leather surface is good, cold tolerance is outstanding, at low temperatures life-time service and not cracking.

Embodiment

Below be specific embodiments of the invention, technical scheme of the present invention is further described, but the present invention is not limited to these embodiment.

Composition of raw materials according to the urethane resin of present embodiment is made up of following component: your ketone diamines 18.66g, isoflurane chalcone diisocyanate 64.53g of the polyethyleneglycol adipate glycol 40.33g of dimethyl formamide 482.64g, toluene 266.87g, molecular weight 2000, PTMG 121g, the antioxidant BHT 0.88g of molecular weight 2000, ethylene glycol 5.18g, different fluorine.

Urethane resin prepares as follows:

(1) prepolymerization reaction: in reactor, drop into toluene 97.74g, polyethyleneglycol adipate glycol 40.33g, PTMG 121g, ethylene glycol 5.18g, antioxidant BHT 0.88g, drop into isoflurane chalcone diisocyanate 64.53g after stirring 20～30min, this moment, solid content should be controlled at 70.35%, temperature is controlled at 75～85 ℃, reacts to get performed polymer in 7 hours;

(2) chain extending reaction: continue in reactor, to add DMF369.49g, toluene 169.13g, cooling simultaneously, temperature of reaction is reduced to about 40 ℃, drop into different fluorine that ketone diamines 16.79g, append different fluorine that ketone diamines again according to reaction tackify situation, the qualified back of viscosity adds DMF113.15g, and temperature is controlled at 40～50 ℃, react that to obtain viscosity in 3 hours be 100KCps/25 ℃, the urethane resin of solid content 25%.

The applicating example explanation of present embodiment:

With 100 parts of resins and after flow agent, proper quantity of defoaming agent, 3 parts of colors, 35 parts of toluene and 35 parts of DMF mix also deaeration in right amount, be coated on the separate-type paper with scraper, via oven drying after 10～15 minutes, coating liquid type tackiness agent (or directly using when adhesive linkage with this resin) again is affixed on wet method Base or the ultra-fine fibre through the later half dry doubling of oven drying 2～3 minutes (or direct wet combining without baking oven) and gets product.The cold-resistant complications of this finished product are pressed ISO5423-1992, ISO-4643:1992, SATRAPM-25-1992 test :-20 ℃ times 80,000 times flawless; The xanthochromia of anti-UV is pressed the HG/T3689-2001 test for 〉=4 grades.

Claims (3)

1. urethane resin, its composition of raw materials is by polyester polyol, polyether glycol, chainextender, isocyanic ester, organic solvent and oxidation inhibitor are formed, it is characterized in that: described polyester polyol is the polyethyleneglycol adipate glycol of molecular weight 2000, described polyether glycol is the PTMG of molecular weight 2000, described chainextender is the mixture of ethylene glycol and your ketone diamines of different fluorine, described isocyanic ester is an isoflurane chalcone diisocyanate, total mass in urethane resin, following and their summation of the mass content of above-mentioned each component is 100%

Polyethyleneglycol adipate glycol 4～5%;

PTMG 11～13%;

Ethylene glycol 0.4～0.6%;

Different fluorine that ketone diamines 1.8～1.9%;

Isoflurane chalcone diisocyanate 6～8%;

Oxidation inhibitor 0.08～0.1%;

Organic solvent 73～80%.

2. a kind of urethane resin according to claim 1 is characterized in that: described organic solvent is the mixed solvent of dimethyl formamide and toluene, and wherein the mass ratio of dimethyl formamide and toluene is 1.5～2.0: 1.

3. a kind of urethane resin according to claim 1 is characterized in that: described resin makes through following steps successively:

(1), synthetic performed polymer: in reactor, add polyethyleneglycol adipate glycol, PTMG, ethylene glycol, oxidation inhibitor, isoflurane chalcone diisocyanate and an amount of organic solvent, solid content is controlled at 70～75%, in 75～85 ℃ of temperature, normal pressure reacted 5～8 hours down, obtained performed polymer;

(2), chain extending reaction: performed polymer is cooled to 38～42 ℃, your the ketone diamines of different fluorine that adds formula ratio carries out chain extending reaction, the temperature of chain extending reaction is 40～50 ℃, under normal pressure, carry out, chain extending reaction obtained viscosity 80～120KCps/25 ℃ in 2～3 hours, the urethane resin of solid content 24～26%.