CN105153917A - Valve antifouling powdery paint with good film-forming toughness and manufacture method thereof - Google Patents

Abstract

The invention discloses valve antifouling powdery paint with good film-forming toughness. High-hydroxyl polyester resin and hydroxy acrylic resin are taken as main film-forming substances, HDI trimer is taken as a curing agent, the product high/low-temperature resistance is improved after modified polyvinylidene fluoride is added, and other effective additives are added, are good in intermiscibility after being modified, are capable of rapidly floating on a paint film surface, and are fixedly attached to the paint film surface through hydroxyl and -NCO, so that pollutants are difficult to attach to the paint film surface, and therefore the paint film possesses durable antifouling self-cleaning performance, and the prepared product is free of solvent, green and environment-friendly, the formed paint film is flat and smooth in surface, also possesses wide temperature adaptability, does not flow at a high temperature of 180 DEG C and does not crack at a low temperature of -30 DEG C, also the paint is good in film-forming toughness, and the formed film possesses self-cleaning performance and anti-scuffing performance.

Description

Antifouling powder coating of valve of a kind of film forming good toughness and preparation method thereof

Technical field

The present invention relates to paint field, antifouling powder coating of valve being specifically related to a kind of film forming good toughness and preparation method thereof.

Background technology

In recent years, the application of powder coating has surmounted water-borne coatings and high solid coating etc. in coatings industry, becomes industry member and uses one of more coating variety.Powder coating process solves the problems such as inflammable, the explosive and contaminate environment existing for traditional paint coating process, and its coating possesses superior performance, the recyclable use again of raw material, and coating process is simple.Valve housing painting can be widely used in load onto.Because valve body is foundry goods or forging, therefore its surface irregularity, also certain defect is there is in currently available technology for the functional powder coating technology of valve surface process, cause coating to occur the defects such as shrinkage cavity, pinprick and serious orange peel shape, and then cause valve to be restricted in special dimension application such as food, biology, pharmacy, chemical industry, space flight and electronics.Thus research and develop multi-functional weather-proof, high-low temperature resistant, waterproof antiwear, anlistatig self-cleaning anti-pollution powder coating, possess skills the meaning promoting to improve with industry.

Summary of the invention

Object of the present invention antifouling powder coating of valve being just to provide a kind of film forming good toughness and preparation method thereof, to overcome the deficiencies in the prior art.

The object of the present invention is achieved like this:

A kind of antifouling powder coating of valve of film forming good toughness, it is characterized in that, be made up of the raw material of following weight part: high hydroxy polyester resin 50-60, Hydroxylated acrylic resin 25-30, HDI tripolymer 4-8, polyvinylidene difluoride (PVDF) 10-20, nano titanium oxide 0.9-1.5, carbonitride 0.2-0.4, attapulgite 6-9, palmityl trimethyl ammonium chloride 0.1-0.4, polychloroprene latex 14-18, dimethiconol stearate 5-8, methacryloxymethyl Trimethoxy silane 2.1-4.2, N,N-DIMETHYLACETAMIDE 20-30.

The preparation method of the antifouling powder coating of valve of described a kind of film forming good toughness, is characterized in that comprising the following steps:

(1) by polychloroprene latex, dimethiconol stearate stirring and evenly mixing, be warming up to 75-95 DEG C and add attapulgite, fully stir and condensing reflux reaction 2-4h, ultrasonic disperse is even, and spraying dry obtains attapulgite modified;

(2) by nano titanium oxide in 690-800 DEG C of high-temperature calcination 30-50 minute, be cooled to room temperature ultrasonic concussion 20-40 minute, add methacryloxymethyl Trimethoxy silane, palmityl trimethyl ammonium chloride stirring and evenly mixing, be warming up to 60-80 DEG C of extra-fine grinding 1-3 hour, dry for standby;

(3) in N,N-DIMETHYLACETAMIDE, add polyvinylidene difluoride (PVDF), after 35 DEG C of heating in water bath are dissolved to clarification, add attapulgite modified ultrasonic disperse evenly, carry out electrostatic spinning, pulverize;

(4) high hydroxy polyester resin, Hydroxylated acrylic resin are put into high mixer high speed and be uniformly mixed 40-60 minute, add step (2), step (3) material and other remaining component, pre-mixing 1-2 hour, drop into melting mixing extruding pelletization in twin screw extruder, pellet is sent into pulverizing mill and is worn into fine powder discharging.

The present invention has following beneficial effect: the present invention selects high hydroxy polyester resin, Hydroxylated acrylic resin is main film forming matter, HDI tripolymer is solidifying agent, add the high and low temperature resistance that modified polyvinylidene difluoride (PVDF) improves product, also add other effective additives and in addition modified simultaneously, intermiscibility is good, coating surface can be floated to rapidly, coating surface is fixed on by hydroxyl and-NCO reaction, pollutent is made to be difficult to attach to coating surface, thus make paint film have the lasting self-cleaning performance of resistance to pickup, the obtained solvent-free environmental protection of product, coating surface flat smooth, also there is broad thermal adaptability, do not trickle under the high temperature of 180 DEG C, do not ftracture at the low temperature of-30 DEG C, and the film forming good toughness of coating, film forming is self-cleaning, anti scuffing.

Embodiment

The antifouling powder coating of valve of described a kind of film forming good toughness, it is characterized in that, be made up of the raw material of following weight part: high hydroxy polyester resin 55, Hydroxylated acrylic resin 27, HDI tripolymer 6, polyvinylidene difluoride (PVDF) 17, nano titanium oxide 0.9, carbonitride 0.3, attapulgite 7, palmityl trimethyl ammonium chloride 0.3, polychloroprene latex 16, dimethiconol stearate 6, methacryloxymethyl Trimethoxy silane 2.9, N,N-DIMETHYLACETAMIDE 28.

Making method comprises the following steps:

(1) by polychloroprene latex, dimethiconol stearate stirring and evenly mixing, be warming up to 75-95 DEG C and add attapulgite, fully stir and condensing reflux reaction 2-4h, ultrasonic disperse is even, and spraying dry obtains attapulgite modified;

(2) by nano titanium oxide in 690-800 DEG C of high-temperature calcination 30-50 minute, be cooled to room temperature ultrasonic concussion 20-40 minute, add methacryloxymethyl Trimethoxy silane, palmityl trimethyl ammonium chloride stirring and evenly mixing, be warming up to 60-80 DEG C of extra-fine grinding 1-3 hour, dry for standby;

(3) in N,N-DIMETHYLACETAMIDE, add polyvinylidene difluoride (PVDF), after 35 DEG C of heating in water bath are dissolved to clarification, add attapulgite modified ultrasonic disperse evenly, carry out electrostatic spinning, pulverize;

(4) high hydroxy polyester resin, Hydroxylated acrylic resin are put into high mixer high speed and be uniformly mixed 40-60 minute, add step (2), step (3) material and other remaining component, pre-mixing 1-2 hour, drop into melting mixing extruding pelletization in twin screw extruder, pellet is sent into pulverizing mill and is worn into fine powder discharging.

The technical parameter index of the antifouling powder coating using the present invention to produce is as follows:

(1) paint film appearance flat smooth, surface tinted is consistent, without particle, pin hole, bubble, wrinkle;

(2) sticking power is good, shock-resistant, and resistance to marring is good;

(3) static minimal contact angle is recorded according to GB/T2376: 112.6 °;

(4) acid resistance (H ₂sO ₄, 3%) and>=30min, paint film is unchanged

Alkali resistance (NaOH, 2%) >=30min, paint film is unchanged.

Claims (2)

1. the antifouling powder coating of the valve of a film forming good toughness, it is characterized in that, be made up of the raw material of following weight part: high hydroxy polyester resin 50-60, Hydroxylated acrylic resin 25-30, HDI tripolymer 4-8, polyvinylidene difluoride (PVDF) 10-20, nano titanium oxide 0.9-1.5, carbonitride 0.2-0.4, attapulgite 6-9, palmityl trimethyl ammonium chloride 0.1-0.4, polychloroprene latex 14-18, dimethiconol stearate 5-8, methacryloxymethyl Trimethoxy silane 2.1-4.2, N,N-DIMETHYLACETAMIDE 20-30.

2. the making method of the antifouling powder coating of valve of a kind of film forming good toughness according to claim 1, is characterized in that comprising the following steps:

(1) by polychloroprene latex, dimethiconol stearate stirring and evenly mixing, be warming up to 75-95 DEG C and add attapulgite, fully stir and condensing reflux reaction 2-4h, ultrasonic disperse is even, and spraying dry obtains attapulgite modified;

(2) by nano titanium oxide in 690-800 DEG C of high-temperature calcination 30-50 minute, be cooled to room temperature ultrasonic concussion 20-40 minute, add methacryloxymethyl Trimethoxy silane, palmityl trimethyl ammonium chloride stirring and evenly mixing, be warming up to 60-80 DEG C of extra-fine grinding 1-3 hour, dry for standby;

(3) in N,N-DIMETHYLACETAMIDE, add polyvinylidene difluoride (PVDF), after 35 DEG C of heating in water bath are dissolved to clarification, add attapulgite modified ultrasonic disperse evenly, carry out electrostatic spinning, pulverize;

(4) high hydroxy polyester resin, Hydroxylated acrylic resin are put into high mixer high speed and be uniformly mixed 40-60 minute, add step (2), step (3) material and other remaining component, pre-mixing 1-2 hour, drop into melting mixing extruding pelletization in twin screw extruder, pellet is sent into pulverizing mill and is worn into fine powder discharging.