34results about How to "TVOC reduction" patented technology

A process for production of wood-base materials from lignocellulosic comminution product is disclosed. The wood-base materials are treated with at least one additive in the course of their production to reduce or diminish the emission of volatile organic compounds (VOCs) and, optionally, very volatile organic compounds (VVOCs), in particular terpenes and acids. The treatment is effected with one additive, being a porous carbon, like activated carbon. In another aspect, the present application is directed to the use of porous carbon, in particular, activated carbon, to reduce or diminish the emission of VOC, and optionally, VVOC, to reduce or diminish the emission of terpene and acids and aldehydes. Also, wood-base materials which are obtainable with the process or wood-based materials produced by using the additives mentioned above and which have reduced emission of VOCs, in particular terpenes and acids but also aldehydes are disclosed.

The invention belongs to the technical field of polypropylene materials, and discloses environment-friendly flame retardant low-odor modified polypropylene and a preparation method and application of modified polypropylene in inner decoration of a school bus. The environment-friendly flame retardant low-odor modified polypropylene comprises the following components by weight percent: 40-90% of polypropylene, 4-30% of a flame retardant, 2-20% of an antismoke agent, 2-5% of an odor adsorbent, 1-5% of a TVOC (Total Volatile Organic Compound) remover and 0.3-1.2% of a stabilizer. According to polypropylene provided by the invention, the effect of excellent mechanical property, good flame retardant effect and low smoke density is realized by selecting a special low-odor nitrogen and phosphorus halogen-free flame retardant and metal hydroxide as the antismoke agent. The odor adsorbent and the TVOC remover are added to effectively remove TVOC and other small molecular matters, so that the modified polypropylene which satisfies the demand on excellent mechanical property, good flame retardant effect, low smoke density, low odor and low TVOC is prepared, and the modified polypropylene can be suitable for inner decoration of the school bus.

The invention relates to a formaldehyde-free antibacterial bamboo straw composite substrate and a preparation method thereof, wherein the preparation method includes in-situ preparation of an antibacterial adhesive: using lignin to reduce silver ions in situ to generate nano-silver to obtain an antibacterial adhesive Preparation of composite base material: the base material includes bamboo scraps and / or straw scraps with a length of 0.3-20.0mm and a thickness of 0.3-0.7mm, which are mixed to obtain a mixture of surface layer and core layer; aldehyde-free antibacterial Preparation of bamboo straw composite substrate: mix and sizing the upper surface layer mixture, the lower surface layer mixture and the core layer mixture with antibacterial adhesive and / or isocyanate adhesive respectively to obtain the sizing For mixing materials, the mixed materials after sizing are paved, hot-pressed and post-treated to obtain the formaldehyde-free antibacterial bamboo straw composite base material. The method provided by the invention makes full use of the existing bamboo and straw resources, and the prepared composite base material has extremely low formaldehyde emission, meets the requirements of the "formaldehyde-free wood-based panels and their products" standard, and has excellent antibacterial properties.

The invention relates to a polyvinyl acetate emulsion and a preparation method thereof. The polyvinyl acetate emulsion is prepared from raw materials comprising the following parts by weight: 15-35 parts of vinyl acetate; 0.1-0.7 parts of acrylic acid; 1-25 parts of vinyl acetate-ethylene copolymer; 0.6 parts of ethylene glycol diacetate ‑4 parts; 3‑9 parts of polyvinyl alcohol; 0.01‑0.4 parts of sodium lauryl sulfate; 0.01‑0.7 parts of antifreeze; 0.1‑5 parts of additives; 45‑75 parts of water. In the polyvinyl acetate emulsion, the content of formaldehyde and TVOC is less than the national standard, does not contain APEO and phthalate, and meets the foreign limit standard.

The invention discloses a biological peculiar smell scavenger and a production method thereof. The scavenger comprises bacillus megaterium (CGMCC 1.2393), candida utillis (CGMCC 2.1012) and azotobacter chroococcum (CGMCC 1.2391). The production method for the scavenger comprises the following steps of: inoculating the activated bacillus megaterium, candida utillis and azotobacter chroococcum into a silicate group bacteria culture medium, a wort culture medium and a nitrogen-fixing culture medium to perform seed liquid culture respectively; and mixing the three seed liquids in a mass part ratio of 0.5-1.5: 1-2: 1-2, and adjusting the concentration of the mixed solution as required. The biological peculiar smell scavenger sprayed to a place with peculiar smell can remarkably reduce the stench TVOC, particularly has obvious effect of reducing ammonia, aldehyde and benzene, and has the advantages of low cost, no secondary pollution and convenient use.

A polyester resin, including:(a) a constitutional unit derived from at least one tetravalent carboxylic acid selected from Compounds (A) and (B);a constitutional unit derived from a bisphenol A-alkylene oxide adduct; anda constitutional unit derived from an aliphatic alcohol having a boiling point of lower than or equal to 290° C.,where the polyester resin is free of a constitutional unit derived from a monovalent carboxylic acid, an acid value of the polyester resin is 8 to 55 mg KOH / g, and an amount of the tetravalent carboxylic acid is 1 to 30 mol % when an total amount of the tetravalent carboxylic acid, and other polyvalent carboxylic acid excluding the Compounds (A) and (B) is set to 100 mol %,where X1, X2, X3 and X4 each independently represent a trivalent organic group, and Z1 and Z2 each independently represent a single bond or a divalent organic group, wherein tetravalent carboxylic acid is, for example, 3,3′,4,4′-biphenyltetracarboxylic dianhydride, 2,2′,6,6′-biphenyltetracarboxylic dianhydride, 4,4′-oxydiphthalic dianhydride, 9,9-bis(3,4-dicarboxyphenyl) fluorene dianhydride, and / or 4,4′-(4,4′-isopropylidenediphenoxy) diphthalic anhydride.

The present disclosure provides a novel transition metal compound which exhibits excellent catalytic activity and is useful in the preparation of a polypropylene having high impact strength, and a method for preparing a homo polypropylene using the same.

The invention provides a one-component silane-modified polyether sealant for automobiles and a preparation method thereof. The raw materials of the one-component silane-modified polyether sealant for automobiles include silane-modified polyether resins and functional fillers. The raw materials of functional fillers include nano activated carbon, carbonate, silicate, photocatalyst and heat activated catalyst. The present invention utilizes nano-activated carbon, carbonate and silicate to adsorb organic gases, and since the composite material also contains photocatalysts and heat-activated catalysts, the adsorbed small molecules can be catalyzed, oxidized, and degraded under the conditions of light and heating. The degradation products are mainly water and carbon dioxide, thereby reducing the TVOC of the product and avoiding the desorption problem of nano-activated carbon at high temperature.

The invention relates to a low-diffusion polypropylene composition which comprises the following components in percentage by weight: 55-99.8 percent of polypropylene composite material and 0.2-5 percent of organopolysiloxane silicone oil, wherein the organopolysiloxane silicone oil comprises one or a plurality of hydrogen-type polysiloxane, hydroxyl polysiloxane, methyl polysiloxane, ethenyl polysiloxane, amino polysiloxane, epoxy polysiloxane and methoxyl polysiloxane silicone oil. A preparation method of the low-diffusion polypropylene composition comprises the following steps of: weighing the components of polypropylene, talcum powder, a toughening agent, an antioxidant, a light stabilizer and the organopolysiloxane silicone oil in percentage by weight; mixing the polypropylene, the toughening agent, the antioxidant, the light stabilizer and the organopolysiloxane silicone oil for 1-2 minutes in a high speed mixer firstly and then adding the talcum powder and mixing for 3-5 minutes; and extruding and pelletizing the mixed materials by using a double screw extruder, wherein the process conditions are that: the temperature of a first area is 200-210 DEG C, the temperature of a second area is 210-220 DEG C, the temperature of a third area is 210-220 DEG C and the temperature of a fourth area is 200-215 DEG C, the retention time is 1-2 minutes, and the pressure is 10-20MPa. Thelow-diffusion polypropylene composition has the advantages that: the organopolysiloxane silicone oil forms a layer of even film on the surface of the talcum powder, which can block up a TVOC (Total Volatile Organic Compound) of the polypropylene material so as to reduce the pollution.