What are the items for quality inspection of paint construction

The requirements of the base surface include the roughness of the base surface, the moisture content and flatness of the base surface. If it is an old wall, it is necessary to see if there is peeling, cracking, etc., if there is a peeling and cracked part, scrape it with mortar or water-resistant putty; If you don't scrape it directly with water-resistant putty. If the requirements are very high, you also need to do back cover processing, polishing and other processes.

Main control items: 1. The variety, model and performance of the paint used in the paint finishing project should meet the design requirements.

2. The color and pattern of the paint finishing project should meet the design requirements.

3. The paint finishing project should be evenly coated and firmly bonded, and should not be missed, penetrated, peeled and powdered.

4. Grassroots treatment of paint finishing projects.

1) On the concrete and plastering base, the alkali-resistant sealing primer should be painted first.

2) The old wall should be cleaned to remove the loose old decorative layer, and the interface agent should be applied.

3) When the concrete and plastering layer are coated with solvent-based coatings, the moisture content is not more than 8; When applying emulsion paint, the moisture content is not more than 10; The moisture content of the wood base is not more than 12.

4) The base putty should be flat, solid, firm, free of chalking, peeling and cracks, and the bonding strength of the interior wall putty should meet the provisions of JG T3049 for building interior putty.

5) Kitchens and bathrooms must be made of water-resistant putty.

General items: 1. The interface between the coating and other decoration materials and equipment should be consistent, and the interface should be clear.

2. Observation of the finishing quality of thin coatings and inspection of pull wires.

3. Observation and inspection of the finishing quality of thick coatings.

4. Observation and inspection of the finishing quality of multi-layer coatings.

The routine testing items of coatings generally focus on physical and chemical properties, environmental performance, ingredient formulation, etc. The routine testing items of coatings that can be provided by Zhongke Testing include toxic and harmful substances, protective properties, etc., such as: adhesion, wear resistance, impact resistance, color, gloss, water resistance, coating thickness, density, viscosity, fineness, moisture content, solid content, etc.

1. Routine inspection of coatings, interior and exterior wall coatings, fireproof coatings, and anti-corrosion coatings.

The test items of general coatings are: container state, color and appearance, viscosity, outflow time, fineness, specific gravity, hiding power, drying time, non-volatile content, mirror luster, hardness, bending resistance, adhesion, impact resistance, water resistance, chemical resistance, heat resistance, sagging, damp heat resistance, wear resistance, salt spray resistance, aging resistance.

2. Steel structure coating quality inspection.

1) Appearance inspection of steel structure coating.

The surface of the component should not be miscoated or missed, and the coating should not peel and rust. The coating should be uniform, without obvious wrinkles, sagging, needle holes and bubbles.

2) Adhesion testing of steel structure coating.

When the steel structure is in the environment of corrosive medium or exposed, the coating adhesion test should be carried out. It has been determined that the adhesion of the coating meets the requirements of a qualified quality standard.

3) Structural coating thickness detection.

Inspection method: Check with dry paint film thickness gauge. Each component is inspected in 5 places, and the value at each place is the average of the dry paint film thickness of the coating coating at 3 measuring points 50 mm apart.

2. Waterproof material testing items.

Conventional waterproof materials mainly include asphalt waterproof materials, polymer waterproof materials, waterproof coatings and building sealing materials.

Asphalt waterproofing material: soluble content, impermeability, heat resistance, tensile force, elongation at maximum tensile force, low temperature temperature, tear strength;

Polymer waterproof materials: tensile strength, tensile elongation at break, heat treatment size change rate, low temperature bendability, dimensional deviation, hardness (Shore A);

Building sealing materials: density, heat resistance, low temperature flexibility, tensile adhesion, tensile adhesion after immersion, surface drying time, sagging.

What products do you use your paint on? Routine testing items for paint chemistry. RoHS, phthalates, PAHs, REACH, heavy metals, and now the detection of new national standard VOCs.

Paint quality inspection = can be inspected by advanced inspection technology.

There are several more representative detection standards:

Point Defects: Defects with a point shape, whose maximum diameter is used when measuring size.

Shadow: An area that appears on the surface of a painted or plastic part in a darker color than the surrounding area.

Orange grain: large and small undulating areas like orange peel shape appear on the surface of painted or electroplated parts.

Exposed substrate: The phenomenon that the local paint layer is too thin on the surface of the painted part and the color of the substrate is exposed.

Fisheye: There are depressions or small pits on the surface of the painted parts due to the uncomfortable evaporation rate of the solvent.

Lint: The fibrous lint that is carried in the paint itself, or when the paint is not dry, falls on the surface of the paint.

Chromatic aberration: The difference in color between the surface of the product and the standard sample (the sample recognized by the customer) is called chromatic aberration.

Multi-glue dots: local small plastic protrusions caused by damage to the reverse side of the mold.

Shrinkage: When the plastic melt passes through a section called thin, the pressure loss is large, and it is difficult to continue to maintain a high pressure to fill the pits formed in the thicker section.

Bright spots: For non-glossy plastic parts, due to the uneven thick wall, the local brightness phenomenon produced at the sudden change in the thick wall. Sensory scratches There are deep scratches on the surface of the product due to the friction of hard objects.

Non-sensitive scratches: Scratches without depth.

Flash: The plastic waste edge generated at the edge of the plastic part or the parting surface due to the injection parameters or mold.

Welding line: When the plastic melt flows in the cavity, when it encounters obstacles (cores and other objects), the melt cannot be well integrated after bypassing the obstacles, so an obvious line is formed on the surface of the plastic parts, which is called the welding line.

Bending: Plane deformation of plastic parts due to internal stress.

Top white Top convex: Due to the large tightening force of the plastic, the ejector rod area is subjected to the white mark or bulge caused by the large ejection force in the front.

Waterproof coatings are widely used, and generally have the characteristics of good weather resistance, acid resistance, deformation resistance, long service life, high tensile strength and large elongation. It is an indispensable material in engineering construction. Zhongke Testing can detect the liquid performance, construction performance, optical performance, mechanical properties and coating film resistance of coatings.

The National Coating Quality Supervision and Inspection Center is accredited by the China Laboratory Accreditation Service as compliant with LSO |The laboratory of EC 17025 "General Requirements for the Competence of Testing and Calibration Laboratories" is authorized by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, and is the only national quality inspection center in China specializing in the quality inspection of paints and paint pigments and fillers.

Zhongke Testing. It has the ability to detect disinfection products, paints and coatings, and chemical products, and provides professional coating testing and analysis solutions.

Focusing on the physical and chemical properties, environmental performance, and ingredient formula of coatings, we provide professional and authoritative test reports. It has a complete quality management system, advanced inspection and testing facilities and equipment, and experienced laboratory professionals. We can provide professional testing services for our customers.

We can carry out all kinds of coating testing services, we can help you choose the right coating testing items according to the material, use, buyer's demand, target market, etc.; Meet the environmental protection requirements of the target market, reduce risks and optimize quality. Zhongke Testing.

Coating testing items include: harmful substance testing, antibacterial and anti-mildew performance testing, aging performance testing, chemical performance testing, etc., and the coating testing report has CMA qualification, which can be used as a trade reputation Yeyi certificate or quality assurance fairness statement.

The quality of the project is the life of the construction unit, and different projects have different requirements for the quality of the project. Therefore, the quality requirements of finishing projects are also different from the quality requirements of other projects, and people need to carry out construction in accordance with the quality requirements of the project in specific practice. The following is a summary of the relevant quality requirements for you.

1. Varnish. 1. Before construction, select the variety and color of paint materials, do a good job of grassroots treatment, strictly follow the operating procedures and the requirements of the number of times of construction, and protect the finished product after He Hu Kai is fully dry for acceptance.

2. The wood grain is clear, the brown eye is scraped flat, no nail hole is exposed, and the surface is smooth and smooth.

3. There is no large surface of the wrinkled skin wrapped in the flute, and there is no obvious place on the small surface.

4. The color is uniform and consistent, and the whiskering is smooth.

5. There shall be no peeling, missing brush and rust.

6. The deviation of the color separation line of the decorative line is 2mm (steel ruler).

7. After drying, the feel and visual inspection from the inspected surface should all meet the requirements.

Second, mixed color paint.

1. Penetrating the bottom, falling, wrinkled skin has no large surface, no small surface, and no small surface is obvious.

2. The surface is smooth, uniform and consistent.

3. Do not pollute other surfaces.

4. The color is uniform and consistent, and the whiskering is smooth.

5. There shall be no peeling, missing brush and rust.

6. The deviation of the color separation line of the decorative line is 2mm (steel ruler).

7. After drying, the feel and distance from the inspected surface should be visually inspected, and all inspections should meet the requirements.

3. Water emulsion coatings.

1. Coatings and semi-finished products should be used within their validity periods.

2. The plasticity and ease of coating of the new putty for coating engineering should meet the construction requirements, and it should be firm after drying.

3. The corners of the base layer are repaired with 1:3 cement mortar, and the surface surface and gaps should be filled with putty.

4. The dust, dirt, and various coatings on the original wall on the surface of the base should be cleaned, and the alkali part should be neutralized with an acidic solution.

5. After the putty is dried, it should be polished flat and smooth, and cleaned up.

6. The surface is smooth, and there is no dusting powder, peeling, and missing brush.

7. There is no obvious color difference, pan alkali, color return, and whiskering.

8. No obvious trachoma, falling, pimple, and splashing.

9. After the paint is dry, the feel and the visual inspection from the inspected surface should meet the requirements.

To sum up, the quality requirements of the finishing project are based on the particularity of the finishing project, and the details of the project are made in detail, and in detail, the different engineering quality is specified according to the three different finishes of varnish, mixed color paint and water emulsion paint. The inspection unit needs to take this as a basis to carefully inspect the quality problems of the project.