31results about How to "Low monomer residue" patented technology

The invention discloses a preparation method for super absorbent resin. In the method, acrylic acid is used as a raw material; an alkaline aqueous liquid is used as a neutralizer to neutralize the acrylic acid; then a cross-linking agent and an initiator are added for implementing polymerization; after the polymerization is finished, resin grains are obtained in sequence through pelleting, drying and crashing; surface treatment is implemented on the resin grains to obtain the super absorbent resin with the advantages of low monomer residue, high pressure resistance and absorbency, fast absorbent speed, excellent condensation resistance and good flowability. The preparation method has fast rate of polymerization and is very stable. The polymer gel grains obtained through reaction can be independently dispersed and can not be mutually stuck and caked. The preparation method has simple technology, high efficiency and high energy utilization.

The invention discloses polyvinyl dichloride (PVDC) coating latex special for cigarette films and a preparation method and application of the PVDC coating latex special for the cigarette films. The PVDC latex is prepared from a certain amount of mixed monomers of vinylidene chloride, methyl acrylate and itaconic acid, a ptomotor, an initiator, an emulgator and a seed emulgator, and the preparation method is seed emulsion polymerization. According to the preparation method, microcrystalline wax capable of having a defoaming effect is added to enable the residual quantity of monomers in the latex is smaller. The cigarette films made of the latex has heat sealing performance and a high barrier property, and can maintain the scent of cigarettes and enable the cigarettes to not go bad and not be affected with damp. The heat sealing strength of the cigarette films is equal to or larger than 3N / 15mm, the coating weight is 3g / m<2>, the permeation amount of water vapor is equal to or smaller than 6g / m<2>*24h, the permeation volume of oxygen is equal to or smaller than 36g / m<2>*24h, and the residual quantity of vinylidene chloride monomers is equal to or smaller than 1mg / kg or is not detected.

The invention discloses a paper coating water-based emulsion and a preparation method and applications thereof. Aiming at the problem that the barrier property of the current paper coating emulsion is not good, the invention provides the paper coating water-based emulsion. The method comprises the following steps: using a certain amount of vinylidene chloride, acrylonitrile, methacrylate and methacrylic acid as a mixed monomer, selecting a special seed emulsifier and a mixed emulsifier, adopting seed emulsion polymerization, and finally obtaining the paper coating water-based emulsion. The paper coating water-based emulsion has good stability, environmental protection and good barrier property. A vacuum desorption post-processing method is adopted in the later period of emulsion polymerization, so that the monomer residual quantity of the obtained water-based emulsion is low. The prepared coated paper has no foreign smell, cannot pollute food or drugs, and is more beneficial to applications to the package field of food, drugs and the like.

The invention relates to a preparation method of water-soluble polymer, and especially relates to a preparation method of ultrahigh molecular weight sulfonic acid-type polyacrylamide copolymer used for tertiary oil recovery oil displacement agents. The ultrahigh molecular weight heatproof salt-resistant sulfonic acid-type acrylamide copolymer prepared by the invention has a high molecular weight, good solubility and a low monomer residual quantity, and thus can be used for polymer oil displacement agents for high-temperature high-salt oil reservoirs. The invention is used in the petroleum exploitation field.

The present invention relates to an acrylic ester compound used for coating, and the compound has the structure of formula (I). The acrylic ester compound used in coatings provided by the invention has lipophilic polycyclic aliphatic groups and hydrophilic hydroxyl groups at the same time, and high polymerization reactivity, and is used for solvent-based acrylic coatings, and the coatings exhibit excellent weather resistance Resistance, abrasion resistance, high gloss and fullness, etc.; for water-based acrylic coatings, the compound's hydrophilic hydroxyl groups and lipophilic alicyclic groups show good compatibility in emulsified systems, and polymerization activity High, low monomer residue, after film formation, the coating exhibits excellent properties such as weather resistance, water and oil resistance, impact resistance and high gloss. Moreover, the preparation method has simple technological process, easy control of conditions, less side reactions, high conversion rate of reaction raw materials, and high product purity.

The invention discloses a method of preparing a biodegradable super absorbent resin by using an eggshell membrane. The super absorbent resin is prepared by employing an ultrasonic irradiation polymerization technique to make a reaction in a water phase system. The super absorbent resin is prepared particularly by the following steps: 1. modifying the inner membrane of the egg; 2. polymerizing thesuper absorbent resin at room temperature. The method is characterized by realization of absorbent resin polymerization at room temperature, no need of external heating modes such as water bath and air, no limitation of a radiation source (e.g., Co60, etc.), and can realize the absorbent resin polymerization at room temperature only by modifying the eggshell membrane, a cross-linking agent and a single-component initiator. The method shortens reaction time, simplifies preparation technology, needs no nitrogen protection and prepares a product with strong water absorbing capacity. The preparedproduct can be used for medical supplies, personal hygiene items, agricultural water retention release agents and the like. The method of the invention has the advantages of uniform structure of prepared absorbent resin, high monomer conversion, simple preparation technology and low cost.

The invention belongs to the technical field of coating materials and particularly relates to a low-permeability sustained-release coating material and a preparation method thereof. The coating material is mainly prepared from the following raw materials: methyl methacrylate, methacrylic acid chlorinated trimethylamino ethyl ester, butyl methacrylate and cellulose or a cellulose derivative. The preparation method of the coating material comprises specific steps as follows: (1) monomers including methyl methacrylate, methacrylic acid chlorinated trimethylamino ethyl ester, butyl methacrylate are polymerized at 40-60 DEG C; (2) cellulose or the cellulose derivative is added, polymerization is continued at 65-80 DEG C, and a finished product is obtained after being cooled to the room temperature. The coating material has better film forming property and coating quality. Sustained-release tablets prepared from the sustained-release coating material have better sustained-release effects in different environments, and drug taking times can be reduced.

The invention discloses an ultrafine environmental-friendly thermal expansion microcapsule, which is prepared by a microwave radiation emulsion polymerization method from a suspension dispersion of an oil phase composition and an aqueous phase composition. High foaming rate, environmental protection and non-toxic, can be used in textile, paper, ink, engineering plastics and other fields. The invention also discloses a preparation method of ultrafine environment-friendly heat-expandable microcapsules. The heat-expandable microcapsules are prepared based on microwave radiation radical emulsion polymerization technology, and the operation is simple, the preparation process is simple, and the production efficiency is high.

The invention relates to a device capable of reducing acidity and moisture of a dichloromethane waste liquid and belongs to the technical field of recovery of the dichloromethane waste liquid. A raw material storage tank of the device is respectively connected with a first solid alkali fixed bed, a second solid alkali fixed bed and a water absorbent fixed bed through a circulation pump by virtue of control valves; a finished product storage tank is connected with the water absorbent fixed bed by virtue of a control valve; and an on-line acidity detector is connected with the raw material storage tank. A solid alkali-loaded mesoporous molecular sieve SBA-15, which is adopted in the device, has the large specific surface area and good hydrothermal stability, can be in full contact with acidic substances in the dichloromethane waste liquid and can be regenerated, and thus the utilization efficiency of the solid alkali-loaded mesoporous molecular sieve SBA-15 is increased. By mixing nanometer calcium carbonate in the process for preparing the solid alkali-loaded mesoporous molecular sieve SBA-15, the acidity-reducing performance of the molecular sieve SBA-15 can be improved.

A preparing method of a polyolefin graft having a high grafting ratio is disclosed. The method includes (1) replacing air in a reaction kettle with nitrogen, and then heating the reaction kettle to 80-180 DEG C, (2) adding a polyolefin under nitrogen protection to the reaction kettle, adding a reaction monomer, an initiator and a crosslinking inhibiting agent after the polyolefin is melted, and reacting the mixture under stirring, and (3) vacuumizing the reaction kettle, then proceeding with the reaction, and subjecting a material prepared by the reaction to high-pressure extrusion, strip drawing and pelletizing to obtain the polyolefin graft. The polyolefin graft prepared by the method has advantages of the high grafting ratio, a low crosslinking degree, weak smell, light color, a low monomer residual amount, high adhesive force, and the like, wherein the grafting ratio of maleic anhydride can reach 4.89%, the monomer residual amount is 0.05% or below, and the adhesive strength can reach 30 N / 15mm.

The invention discloses a polyvinyl dichloride (PVDC) latex special for kraft paper used for food packaging and a preparation method thereof and application thereof. The kraft paper coated by the PVDC latex can be used for packaging of foods such as peanuts, melon seeds and walnuts. The PVDC latex is obtained by a mixed monomer, an auxiliary, an initiating agent, an emulsifying agent and a seeded emulsifying agent, wherein the mixed monomer contains a certain amount of vinylidene chloride, vinyl cyanide, butyl acrylate and acrylic acid, and the seeded emulsifying agent contains sodium dodecyl benzene sulfonate and a 2A-1 emulsifying agent. The prepared PVDC latex is good in stability and free of emulsification breaking and sediment after placed for 24 months under temperature of 30 DEG C and relative humidity (RH) of 70%. Monomer residual volume in the latex is lower. The kraft paper coated by the PVDC latex has the advantages of being environment-friendly, degradable, good in heat tightness, waterproof, damp proof and the like. When coating amount of the latex is 20g / m2, steam transit amount is less than or equal to 3g / m2.24h and oxygen permeability is less than or equal to 6g / m2.24h, monomer residual amount of the vinylidene chloride is less than or equal to 1ppm or not detected, and heating sealing intensity can reach 3N / 15mm.