An amphoteric betaine-type polycarboxylic acid water reducer and a preparation method therefor are provided in the present invention. An unsaturated betaine-type monomer A and an acrylic acid-type polyethylene glycol monomer B are placed in a reaction container, stirred until uniform and then an acrylic acid-type monomer C is added, the stirring is continued and water is added to make adjustments so as to make the total mass of the monomers account for 10%-20% of the total mass of the aqueous solution; and under the protection of an inert gas, the temperature is raised to 60° C.-100° C., an aqueous initiator solution is added, maintaining the temperature and reacting for 4-6 h, and after the reaction is completed, the solution is cooled to room temperature, and the pH value thereof is adjusted to 5-7 to prepare the amphoteric betaine-type polycarboxylic acid water reducer.

The present disclosure relates to an acrylic emulsion pressure-sensitive adhesive composition, and more particularly, to an acrylic emulsion pressure-sensitive adhesive composition which can realize excellent adhesive properties and hardly occurs residues during peeling, and thus, can be used for paper labels, etc.

The present disclosure relates to an acrylic emulsion pressure-sensitive adhesive composition, and more particularly, to an acrylic emulsion pressure-sensitive adhesive composition which can realize excellent adhesive properties and hardly occurs residues during peeling, and thus, can be used for paper labels, etc.

The present invention provides a novel metal corrosion inhibitor containing a compound having a specific structure. The present invention relates to a metal corrosion inhibitor including a compound (X) including one molecule of a mercaptocarboxylic acid or a mercaptocarboxylic acid salt; one molecule of acrylic acid, an acrylic acid salt, or an acrylic acid ester; and one molecule of a monomer (B) represented by the following formula (1), which are bonded to each other: ##STR00001##

The present invention provides a novel metal corrosion inhibitor containing a compound having a specific structure. The present invention relates to a metal corrosion inhibitor including a compound (X) including one molecule of a mercaptocarboxylic acid or a mercaptocarboxylic acid salt; one molecule of acrylic acid, an acrylic acid salt, or an acrylic acid ester; and one molecule of a monomer (B) represented by the following formula (1), which are bonded to each other: ##STR00001##

The invention relates to a copolymer obtained by polymerisation reaction of at least three comonomers: a first anionic monomer, a second monomer comprising an olefin unsaturation, and a third monomer comprising a hydrophobic group. The invention likewise relates to the use of said copolymer as a thickening agent, in particular in aqueous suspensions of mineral particles with high solids content. The copolymer according to the invention makes it possible to improve the compromise between viscosity with high shear gradient and viscosity with low shear gradient, while also improving water retention inside the suspension.

A preparation method of a powdery polycarboxylate superplasticizer is provided, including: mixing a superplasticizer monomer with water to produce a mixture, heating and melting the mixture to produce a melt system; carrying out a bulk polymerization reaction by adding an initiator, a chain transfer agent and an unsaturated carboxylic acid into the melt system, forming a polycarboxylate superplasticizer precursor; and neutralizing and pulverizing the polycarboxylate superplasticizer precursor to produce a powdery polycarboxylate superplasticizer. Water is added in the bulk polymerization and reacts with the superplasticizer monomer and the unsaturated carboxylic acid. While the bulk polymerization reaction is guaranteed to be efficiently carried out and the solid polycarboxylate superplasticizer is formed, the viscosity of a bulk polymerization reaction system is reduced. The superplasticizer is suitable for dry-mixed mortar, high-efficiency concrete and other products.

A preparation method of a powdery polycarboxylate superplasticizer is provided, including: mixing a superplasticizer monomer with water to produce a mixture, heating and melting the mixture to produce a melt system; carrying out a bulk polymerization reaction by adding an initiator, a chain transfer agent and an unsaturated carboxylic acid into the melt system, forming a polycarboxylate superplasticizer precursor; and neutralizing and pulverizing the polycarboxylate superplasticizer precursor to produce a powdery polycarboxylate superplasticizer. Water is added in the bulk polymerization and reacts with the superplasticizer monomer and the unsaturated carboxylic acid. While the bulk polymerization reaction is guaranteed to be efficiently carried out and the solid polycarboxylate superplasticizer is formed, the viscosity of a bulk polymerization reaction system is reduced. The superplasticizer is suitable for dry-mixed mortar, high-efficiency concrete and other products.

One of the purposes of the present invention is to provide a silicone which has polymerizable groups at the both terminals and an amphiphilic side chain and which provides a copolymer having high surface wettability. The present invention provides a silicone represented by the formula (1): in the formula (1) R.sup.1 is a group represented by the following formula (2): wherein n is an integer of 2 to 8 and R.sup.4 is a methyl group or a hydrogen atom, “a” is an integer of 1 to 500, b is an integer of 1 to 100, provided that a+b is 50 to 600, the siloxane units in the aforesaid parentheses may be bonded in a block or at random, R.sup.2 is, independently of each other, a substituted or unsubstituted monovalent hydrocarbon group having 1 to 10 carbon atoms, R.sup.3 is, independently of each other, an alkyl group having 1 to 6 carbon atoms, A.sup.1 is a group represented by the formula (3) or (3′): wherein R is a hydrogen atom or a methyl group, B.sup.1 is a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an aralkyl group having 7 to 12 carbon atoms, or an acyl group having 1 to 6 carbon atoms, m is an integer of 0 to 8, p is an integer of 1 to 10, q is an integer of 1 to 50, and the polyether units in the parentheses are bonded in the above-described order.

One of the purposes of the present invention is to provide a silicone which has polymerizable groups at the both terminals and an amphiphilic side chain and which provides a copolymer having high surface wettability. The present invention provides a silicone represented by the formula (1): in the formula (1) R.sup.1 is a group represented by the following formula (2): wherein n is an integer of 2 to 8 and R.sup.4 is a methyl group or a hydrogen atom, “a” is an integer of 1 to 500, b is an integer of 1 to 100, provided that a+b is 50 to 600, the siloxane units in the aforesaid parentheses may be bonded in a block or at random, R.sup.2 is, independently of each other, a substituted or unsubstituted monovalent hydrocarbon group having 1 to 10 carbon atoms, R.sup.3 is, independently of each other, an alkyl group having 1 to 6 carbon atoms, A.sup.1 is a group represented by the formula (3) or (3′): wherein R is a hydrogen atom or a methyl group, B.sup.1 is a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an aralkyl group having 7 to 12 carbon atoms, or an acyl group having 1 to 6 carbon atoms, m is an integer of 0 to 8, p is an integer of 1 to 10, q is an integer of 1 to 50, and the polyether units in the parentheses are bonded in the above-described order.