Low-hardness solvent-proof polyurethane elastomer and preparation method thereof
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A technology of polyurethane elastomer and low hardness, which is applied in the field of printing products and can solve problems such as low mechanical properties
Active Publication Date: 2013-11-27
LIMING RES INST OF CHEM IND
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Problems solved by technology
The solvent resistance of polysuccinate polyester system is better than that of polyadipate polyester, but the mechanical properties are lower
Method used
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Embodiment 1
[0029] Synthesis of component A: first mix 1000g of polyester polyol LM2856 and 30g of talc powder, then add colloid mill (the minimum adjustment distance of the grinding disc is 0.01mm) for secondary mixing and dispersion, then take 515g into the reactor, heat to 125°C, vacuum Dehydration was carried out for 2 hours, the material temperature was lowered to 70°C, 100g of TDI was added, and the reaction was carried out at 95°C under nitrogen protection for 1.5h.
[0030] Synthesis of component B: 92gGLY, 191gTIPA, 75gTEA, 0.07g bismuth carboxylate and 0.7g defoamer were added to the reactor for stirring and mixing, and the temperature was controlled at 50°C for 1 hour.
[0031] Elastomer preparation: Mix A and B according to the mass ratio of 100 / 9.2, defoam, pour into a 2mm mold at 130°C, demould for 60 minutes, vulcanize for 20 hours at 125°C, and measure performance after 7 days at room temperature. The properties of the obtained materials are shown in Table 2. Example 2
Embodiment 2
[0032] Synthesis of component A: first mix 1000g of polyester polyol LM7510, 200g of DEP and 60g of calcium carbonate, add colloid mill for secondary mixing and dispersion, then take 630g into the reactor, heat to 125°C, dehydrate under vacuum for 2h, The temperature was lowered to 70°C, 150g of TDI was added, and the reaction was carried out at 75°C under nitrogen protection for 2h.
[0033] Synthesis of component B: Add 134g TMP, 19.1gTIPA, 23gTEA, 0.1g bismuth isooctanoate and 0.6g defoamer into the reactor for stirring and mixing, the temperature is controlled at 70°C and the mixing time is 1h.
[0034] Preparation of elastomer: Mix A and B at a mass ratio of 100 / 6, defoam, pour into a 2mm mold at 110°C, demould for 90 minutes, vulcanize at 120°C for 20 hours, and measure performance after 7 days at room temperature. The properties of the obtained materials are shown in Table 2.
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Abstract
The invention discloses a low-hardness solvent-proof polyurethane elastomer and a preparation method thereof. The raw material of the low-hardness solvent-proof polyurethane elastomer comprises two parts including a component A and a component B, wherein the component A comprises 100 parts of polyester polyatomic alcohol, 15 to 30 parts of toluene diisocyanate, 0 to 20 parts of soften flux, and 3 to 10 parts of filling material; the component B comprises 100 parts of chain extendor, 0 to 0.5 part of foam killer, and 0.02 to 0.05 part of catalyst. The chain extendor is composed of an alcohol amine chain extendor and a three-functionality alcohol chain extendor, wherein the alcohol amine chain extendor adopts a mixture of TIPA (triisopropanolamine) and DEA (diethanol amine) or TEA ( triethavolamine), and the mixture molar ratio is 1 to 0.5-1.5; the three-functionality alcohol chain extendor is made of GLY (glycerine),TMP (trimethylolpropane) or TME (trimethylolethane); the molar ratio of the three-functionality alcohol chain extendor to the alcohol amine mixture is 1 to 0.25-1.5. The material has a better mechanical property, and better solvent resisting performance and cutting machinability, and can be used in the fields of color coating and the like.
Description
technical field [0001] The invention relates to a low-hardness solvent-resistant polyurethane elastomer and a preparation method thereof, in particular to a product with good mechanical properties and solvent resistance that can be used in printing fields such as color coating. Background technique [0002] The color coating process refers to the use of cold-rolled strip steel, galvanized steel strip (electro-galvanized and hot-dip galvanized) as the substrate on the continuous unit, after surface pretreatment (degreasing treatment), and a layer of coating by roller coating. Or multi-layer liquid paint of different colors, after baking and cooling to get the process of color-coated sheet. Color plates are widely used in construction, decoration, home appliances, automobiles, ships and other industries. Since the paint used in the color coating production line contains a variety of solvents, the roller coater needs a low-hardness solvent-resistant polyurethane rubber roller,...
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