47results about How to "Improve heat and humidity stability" patented technology

The invention relates to a leather retanning method. The method comprises the following steps of: water washing, rewetting to soften, retanning with chrome, neutralization, dyeing to fill, adding grease, dyeing in set and the like; and finally, drying, finishing and coating to obtain the finished product, i.e. leather. In the invention, the process of retanning with chrome is adjusted and a proper environment-friendly tanning agent is adopted, so the content of chrome in chrome liquid can be reduced, the fullness and the toughness of the leather is effectively improved, dyed color is uniform,the heat and humidity resistant stability of the leather can be improved, the physical performances of the leather are uniform, and the finished leather is soft and bend-resistant and is high in tensile strength; the amount of used water in the processing process is small, and the generated industrial waste water is little, so environment protection is facilitated; and the process period is relatively short, so the electric energy consumption is low, the cost is low, and the method has a better economic benefit.

A resin composition including a polylactic acid resin, a thermoplastic resin other than a polylactic acid, and a carbodiimide compound having a specific cyclic structure. Provided is a resin composition that exhibits improved compatibility between the polylactic acid resin and the thermoplastic resin other than a polylactic acid.

The invention discloses a method for preparing a urea-modified phosphonium salt tanning agent. The preparation of the tanning agent is characterized in that 160-200 parts by mass of a tetrahydroxymethyl phosphonium salt solution is added to a heat-resistant, pressure-resistant and corrosion-resistant tank equipped with a stirrer and a thermometer. in the reaction kettle. Raise the temperature to 70-90°C, adjust pH=4.5-6.5 with alkali, slowly add 25-40 parts by mass of peroxide, react for 2.0-4.0 hours, cool, adjust pH=6.0-6.5, and obtain a light yellow solution. Add 30-60 parts by mass of urea and 150-200 parts by mass of deionized water into another reactor and mix them. Add 10-15 parts by mass of the catalyst, raise the temperature to 40°C-50°C and react for 2.0-3.0 hours, and adjust the pH=5.0-6.0. Add the above-mentioned light yellow solution, heat up to 60-90°C, react for 4.0-6.0 hours, cool down to 30-40°C, slowly add 20-30 parts by mass of peroxide, and react for 1.0-2.0 hours to obtain a light yellow viscous Thick liquid chrome-free main tanning agent for leather.

A special modified bitumen waterproofing membrane based on BIPV technology is characterized in that the modified bitumen waterproofing membrane is a three-layer composite structure, which is a waterproof material layer, a weather-resistant layer, and a waterproof reinforcement layer in order from top to bottom. The invention also provides a method for preparing a modified bitumen waterproofing membrane specially based on the BIPV technology, which includes the steps of stirring the bitumen, adding a modifier, grinding, cooling and the like.

The invention discloses an epoxy leather tanning agent and a preparation method thereof. The preparation method comprises the steps that a part of epoxy chloropropane is dropwise added into isophoronediamine at first and reacts at the temperature of 25-35 DEG C for 2-4 h, after polyatomic alcohol and a catalytic agent are sequentially added, the other part of the epoxy chloropropane is dropwise added, after all the epoxy chloropropane is added, the temperature is raised to 50-70 DEG C, reaction is conducted for 3-8 h, an alkali compound is dropwise added when the temperature is lowered to 20-45 DEG C, reaction is conducted for 2-4 h, finally, a neutralizer is added for neutralization till the pH value is neutral, an upper-layer product is rotated and filtered, the epoxy leather tanning agent comprising the following formula is obtained, and the formula can be seen in the specification. The epoxy leather tanning agent is low in production cost, can be stably stored for longer than 6 months at the normal temperature, and is low in viscosity, good in heat stability, wide in molecular weight distribution and short in tanning time, the tanned leather is pure white, full and good in hydrothermal stability and yellowing resistance, and the storage stability is good.

The invention discloses a transparent flame-retardant polycarbonate composite material. Through the compounding of two kinds of polycarbonate with a specific weight-average molecular weight range and the compounding of a selected flame retardant with a specific content, not only good flame-retardant properties can be achieved. Effect and moisture and heat aging resistance, and can maintain good transparency.

The invention relates to a preparation method for a leather tanning agent, in particular to a preparation method for a leather tanning agent with function of strengthening and toughening collagenous fibers. The leather tanning process is a qualitative change process converting raw hide into leather, and can endow the leather with good heat and humidity resistant stability, flexibility and physical and mechanical properties; however, a chrome tanning agent commonly adopted has serious harm to the environment, while a conventional non-chrome tanning agent is hard to meet the requirement on goodservice performance of the leather. The preparation method takes montmorillonite and acrylic monomers as raw materials, and adopts a monomer in-situ intercalation polymerization method to synthesize the toughening type leather tanning agent; and the toughening type leather tanning agent is used for tanning the leather, can greatly improve the strength and toughness of crust leather, and can reduce the dosage of the chrome tanning agent by 75 percent.

The invention discloses a method for using carbodiimide catalyzed amino-terminated hyperbranched polymers for leather tanning, and particularly relates to a method which is characterized in that the carbodiimide catalyzed amino-terminated hyperbranched polymers and a raw leather collagen fiber net generate multi-point covalent cross-linking; in the tanning step, the carbodiimide catalyzed amino-terminated hyperbranched polymers and the raw leather collagen fiber net are used for generating multi-point covalent cross-linking, so that the amino-terminated hyperbranched polymers and the raw leather collagen fiber net are used for generating multi-point covalent cross-linking, and thus the damp heat resistance stability and other physical mechanical performance of finished product leather tanned by the amino-terminated hyperbranched polymers can be improved. Under the catalysis of the carbodiimide, the amino-terminated hyperbranched polymers have the capability of singly bearing a tanningagent; a filling agent is re-tanned; the application range of the amino-terminated hyperbranched polymers to leather chemical engineering is expanded. The tanning method provided by the invention usescarbodiimide as the tanning catalyst, and uses the amino-terminated hyperbranched polymers as basic materials; when the method is applied to the leather tanning work section, the finished product leather has the advantages of good damp heat resistance stability, excellent physical mechanical performance, richness, softness and the like are realized.